Max M. Carter Dot Com
Comments and Questions / Forum
July 5, 2008
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[Sun Jan 21 06:20:53 2007] class....
test
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[Sun Jan 21 06:26:38 2007] class....
test from class
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[Sun Jan 21 06:27:07 2007] class....
test from viewcoms
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[Sun Jan 21 06:28:39 2007] class....
test from 'max's comment box
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[Sun Jan 21 08:54:37 2007] class....
Nice Outline! I think those will be very helpful.
Love,
Tego
[96]
[Mon Jan 22 13:43:05 2007] class....
Question for you: When opening a program window (such as IE) the window often comes up in its non-maximized mode. Clicking the 'maximize' button or double-clicking the bar at the top of the window always maximizes the window, but after closing the window and reopening at a later time, it comes back up in the non-maximized mode again(!), making the maximize step necessary again! How do you get the window to remember to come back up maximized??
(This seems to be a "feature" of WinMe for sure - not sure about XP.)
[576]
[Mon Jan 22 13:44:44 2007] class....
Start with all windows closed. Open up one window (IE for example) and maximize it. Leave it open. Now, open up another window (It will open up NOT maximized). Maximize this one too. Now close both. Open up a new window and it'll open up maximized.
Another way to do it, although not really correct, is if you open up a window and it's not maximized, you can resize it (by putting your mouse on the corner of the windows and dragging) to it's maximized position. When you close it and open another window, it should come up to the size you resized it too.
Hope this helps!
[634]
[Tue Jan 23 15:20:48 2007] class....
clear day no wind.
[28]
[Tue Jan 23 15:20:49 2007] class....
Max,
Very good class today.
[44]
[Tue Jan 23 15:20:50 2007] class....
max is nice
[21]
[Tue Jan 23 15:20:56 2007] class....
Max Help!
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[Sun Jun 24 07:10:16 2007] class....
i like your site!
[29]
Dear Reader,
The following 65 or so entries in this file were selected and copied from the original CLOSED comment file on this site. In keeping with the promise made to posters at that time - that I would be the only person reading the comments - all identifying and contact information has been removed. If one of these posts is yours and you would like it removed, contact me here: My responses to these posts have long since vanished into cyberspace..
Max
[Mon Oct 24 23:22:32 2005] amblog...
Well Max... I just finished reading the story of "Cat Radio". It captivated me even though I knew of the outcome beforehand.Be an even more wonderful world I'm thinking, if every little girl were able to have the kind of bonding memories that Tegan has of having this sort of lightly illegal alliance (being in cahoots) with her Dad, sharing an interest – while, all the while, having fun!Enjoyed the read.Carlos
[480]
[Sat Oct 29 11:44:26 2005] about....
Hi Max,I enjoyed reading about the AM transmitter project - the push-pull topology is what I used for mine except I used IRF620's and was about 10dB down on your for output power! I used fet driver chips with a transformer to force a square wave on the gates. I am curious about your use of the 2N2222 as the complimentary drive - was it really happily driving those big fat (1200pf or so input) fets at nearly 2megs!!??I am wondering if I ought to give it a go as I have a 9100b Optimod AM broadcast audio processor....it would be fun to join in the 160M phone nets using something like that!Kind Regards,Rash.
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[Sat Oct 29 22:56:23 2005] fmtx.....
I LIKE TO BUY YOUR 200 WATT AM TRANSMITTER AND I LIKE TO COMTACT WITH YOUJOEL
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[Mon Oct 31 09:18:16 2005] home.....
2+2=4the end.
[39]
[Mon Oct 31 18:06:53 2005] home.....
Hi Max,
This is just a test.%%*
;-)
John
[99]
[Tue Dec 6 20:53:01 2005] fmtx.....
I've worked quite a few years as an engineer in TV & FM broadcasting; as an announcer; as a public safety/lmr 2-way radio tech; as a telephone company datacomm tech; as a commercial satellite tech; as a catv headend/distribution tech; have built quite a few 200' Rohn-25 towers; am a "ham," design/install surround sound home theaters; catv systems, etc. Have long thought about building an FM stereo lpfm station; possibly a pirate; also want to build a digital tv cable system, among other things. THOROUGHLY enjoyed your website. Funny, my wife is nicknamed "Cattie," and my daughter, "Little Cat." You are obviously a wonderful family. Is a pre-etched & drilled pcb, and parts, available for the '96? With YOUR mods? I would LOVE to build one; would put it on the air right away. I would even allow regularly scheduled programming thru my broadband connection FROM YOU to continue some of your "catcasts!" I wish you and your sweet little daughter the best. You are most fortunate to have each other. God bless. Dean ;
[1185]
[Tue Dec 6 21:03:59 2005] twist....
This is from Dean...I have some lowband Motorola Micor & Mitrek 100-watt mobiles, some GE 100-watt mobiles, some Uniden 800 meg SMR trunking mobiles, and some low band GE stations; all of them complete and tested good condition. For sale/trade. Anything special you are looking for that I might could help locate for you out here in the oil fields of West Texas? soon to be General or Extra AND Commercial!
[458]
[Sun Jan 15 20:50:53 2006] home.....
can you send me an FSK transmitter and Receiver. it would be a great help.. thanks
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[Sun Jan 22 23:22:41 2006] about....
Nice work! I was just wondering if you ventured out again into the broadcast spectrum with your AM rig. I've & ("we") have enjoyed "Holiday Pirating" since the 70's. But the money hungry commision has cluttered up the spectrum so much that "NOW" you can't find a clean spot to operate and be heard without using some muscle & creating a little splatter. Looks like we'll have to get retro and utilize some AM emmisions to continue the tradition. Just when that FM system was sounding so good too! I'm trying to stay away from Ch.6 audio 87.75. But 87.9 might be my only other option. Oh well! We've had fun so far! Just don't want to be limited to a net audio stream! Not very exciting! Good for friends out of the listening range, and maybe linking to a remote xmtr, but... Have fun! Comment?
[874]
[Fri Feb 17 11:03:21 2006] amblog...
Hi Max! Long time, no chat. Found your website fascinating. Would love to talk. I live in the far northern corner of Washington State. I work (still) at a test lab .73, Jim .
[299]
[Mon Apr 3 13:06:33 2006] fmtx.....
Nice set of well thought-out mods! I'm not sure why you used the composite as the point for checking your modulation level. I would have looked at the AUDIO rather than the whole thing. I understand the idea of taking the BB (TP4) signal (after all, it has the sum signal). However, the pilot will surely mess with your overall levels. Perhaps you can compensate with the threshold setting of the limiter.It might also be worth adding a diode clipper after the limiter - it's really brutal, and can sound horrible, but if correctly set will completely prevent overshoot modulationpeaks.
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[Fri Apr 7 00:13:15 2006] classe...
nice comment box
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[Fri Apr 7 07:17:48 2006] home.....
CAN U PLZ SEND ME CIRCUIT FOR MAKING A LONG RANGE FM TRANSMITTER LIKE YOURSAT
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[Fri May 12 21:34:44 2006] home.....
Hi Max,Good lookin' laser pics. I'm still trying to get the mini-movie to run. I don't know if it's the video or my computer that's the problem, but it's likely the computer.The white light video effect from the laser has to be clipping of the data read by the sensor. As in, "white is just really bright black."John
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[Sun May 28 20:18:45 2006] catradio.
Catradio was a great story (and a nice way for you and your daughter to share some time together,) good it wasn't in the crow-bar motel! Funny story, I had acartoon, to that effect hanging on mybedroon wall when the FCC paid me a visit, many many years ago, 1966'ish Ithink. 6c4 osillator driving 6l6, plate modulated with back to back CTC universal audio output transformer, Dynco hi-fi amp. Operated a "request" radio station, maybe 4 days. I lived inMilwaukee Wisconsin area, FCC heard me by a FCC monitoring station (across lake Michigan) in Michigan. I still have myofficial letter & a reel to reel tape of"crazy dave's" radio station. Regards &73's
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[Sun Jun 4 12:30:07 2006] catradio.
LOVE IT! JUST BE MORE CAREFUL NEXTTIME. It CAN be done for years withsufficient care. Best of luck es 73.
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[Sun Jun 11 05:25:47 2006] home.....
Hello from Atlanta!!!
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[Wed Jun 14 14:34:40 2006] gatrip...
These were great, thank you so much for sending them. You gave me a good idea of the ceremony etc. Love the aquarium shots. I too wonder if Mom helped build that boomer. I'll try to do this for you when we go to New Zealand....I've nothing from Fauna's graduation but will try to get her to send me some. Lucky you got to be sheltered while daughter was exposed. Just the opposite for us with daughter nicely sheltered from the rain and us staring at umbrellas. Aren't mortar boards funny hats. Love, Tracy
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[Wed Jun 14 14:41:05 2006] gatrip...
test
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[Thu Jun 15 13:10:58 2006] gatrip...
Hey,Everyone looks relaxed and content! You look like you had a great time.See you tomorrow!The gang at SFSThank you for sharing..............
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[Thu Jun 15 16:50:11 2006] gatrip...
Great pictures. Keep the site its excellent.Anna
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[Tue Jun 27 07:10:05 2006] classe...
HI!ABOUT MODULATION,CAN I USE PWM OR CLASS H MODULATOR?
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[Wed Jun 28 03:46:08 2006] classe...
HI!ABOUT MODULATION,CAN I USE THE PWM OR CLASS H MODULATOR?PLEASE SEND ME INFORMATION ABOUT THAT: thanks!
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[Tue Jul 4 04:16:55 2006] classe...
please I'm a nigeria undergraduate in one of nigeria universities,i'm PHILIP, i want to learn how to design a transmitter.can i learn from your company.
[219]
[Sun Jul 30 10:04:08 2006] home.....
Hi!how is the rms power of 1710khz trans. and how is the pep?thanks!
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[Sun Jul 30 10:06:45 2006] home.....
Hi!how is the rms power of 1710khz trans. and how is the pep?thanks!Can i tune this transmitter 550-1800khz?
[153]
[Fri Aug 25 14:54:37 2006] catradio.
Hi, That was a good story and enjoyed reading it. Glad to hear Cat Radio lives on. I operate an internet radio station at radionc.com as well as a LPFM from my location. The FM signal stays within the part 15 limits most of the time :o) I am legally licensed to play copyrighted music on both. My transmitter is a pci card adjustable type with a max of 1 watt but reaches several miles with my 1/4 wave antenna when at full power. The town I live in also has no FM station. The ones that do come in play stuff I (and most others my age) don't want to hear. I hope the laws will change for LPFM so that us smaller broadcasters can get licensed and reach our local communities with an alternative to the new age music. Take Care, Wildun ..
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[Fri Sep 29 22:10:41 2006] home.....
im looking for some tune up ? hop ups for my galaxy DX949 raido plese help me thanks thanks again
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[Wed Oct 18 08:59:29 2006] amblog...
How can I find a 60 watts AM transmitter for a community station?
[100]
[Fri Oct 20 23:40:31 2006] amblog...
Hello! Interesting stories you have regarding your AM and FM low powered days. Do you ever fire up eith the 35 watt AM or the 14 watt FM transmitters anymore? I know a guy that is considering putting on a low powered AM station in Rome NY, about 20 miles from me. Should be interesting to say the least.Bob-
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[Sun Oct 22 04:28:16 2006] catradio.
Radio QRP - The Art of Low Power and Clandestine Operationshttp://www.geocities.com/Radio_QRP/We need your support! QRP is The Art of Low Power Radio where the challenge is to operate and/or build AM radio transmitters using a bare minimum of components, money and construction skill. Why work QRO with a factory set, when homebrew QRP works really well! We are searching for the ultimate design of a Grenade transmitter or Grenade Clone with a minimum of 5-10 watt output and is complete and working! Can anyone help us locate such a unit? We would appreciate any ideas on how to design this rig. Information in this subject would be appreciated! Thanks!
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[Thu Oct 26 20:36:31 2006] catradio.
you are the man, my mpx 96 started hissing and I lost all the schematics and stuff for it, its been so long since I built it I forgot what the adjustments were but found your page and was saved. I use mine to transmit out to the end of the driveway while plowing snow and working around the yard
[309]
[Sat Oct 28 17:09:28 2006] fmtx.....
i have a radio station. my exciter is not producing sound out for broadcast. but the lights indicates that i am get the input. please help me. my station is off now. this is my e-mail.
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[Sat Nov 11 20:31:00 2006] home.....
Hi Max,I'd like to know what HTML command set to use to work on my pages. Can you refer me to the appropriate version?Tnx,John
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[Sat Dec 9 15:33:27 2006] amblog...
I am totally a hobbiest, not that dedicated to anything. I have been trolling the internet since the late 90's looking for a variety of low-tech transmitter designs. The designs fall into two categories: one transister 'bugs' that can be built for $5-$10 and big fancy pirate rigs that require lots of hard to find (expensive) parts. I heard that P.O.W.s made recievers with rusty rasorblades, graphite pencil lead, coils of wire on toliet tissue rolls and a tank commander's headphone. I wanted to design the transmitter equivalent of that. It's gotten a bit fancier than that. It's all made out of NTE replacement parts and "magnet wire" and little bits of cat4 untwisted braid. I'm too chicken to take it on the air, but I think it may have as much as four watts of something. Running it into three 150ohm 5watt resistors in paralell they get warm like a coffee mug warmer, and once I stuck it onto a 130 foot random wire thrown over the house, grounded it to a cold water pipe and stuck one of those 12 volt garden lightbulbs in series with the antenna and it lit right up. It was winking brighter in time with the music, then about ten seconds was all I could stand. I was (and still am) afraid that an rf version of "shot spotter" will triangulate to within 60 feet of my house. So, I have yet to see how well it modulates off of the dummy load. I guess by all rights it is a three stage transmitter in one box.
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[Wed Dec 13 13:23:58 2006] amblog...
Hi,How was the audio freq. response of your Globe with the "heavy Iron". Sound good on your 10 mile drive? I am currently working on that same setup with a Johnson Viking II. I take it that "Super Modulation" was not worth it. Im also on a quest for more info about that . The ARRL book doesnt have much information.Best Regards,
[431]
[Sat Dec 16 00:04:03 2006] amblog...
The trouble with obtaining or building a quality am transmitter is that there are several "kits" out there (of which some are better than others) which seem pretty promising on paper but are a let-down once assembled. They either have poor audio quality or are so complex in design that it is near impossible to troubleshoot them when they "go astray." As for that globe transmitter conversion, that was a work of genius. Some of the terminology was hard for me to follow even though I have an AAS Electronics Tech degree from DeVry. I have been heavily involved in amateur radio since I was in high school. One guy named Phil had an interesting kit/plan posted online called the Li'l7 transmitter which is a basic one-tube design. It is easy enough to understand the fundimentals of such a simple circuit as this, given it uses a basic tank circuit and heartly oscillator. It did not look too different from a one or two transistor AM transmitter, but probably is a little more powerful being a tube rig and all. The only problem with the circuit is that it puts out entirely too little power (probalby about 100mw) to do much of anything with. I am in need of a little (not much) more complex circuit diagram, say a two or three tuber that will put out say a watt or two. At least this would be easier to assemble than any darn computer or PLL controlled AM transmitter would be, and it would definately outpreform say an SSTRAM or A Ramsey AM-25 in high power configuration. Any suggestions of schematics for a simple AM transmitter in the one to two watt range would be greatly appreciated. Do you have any idea of how to "beef up" or add a second stage to a Lil'7 for a bit more power? I would sure appreciate it. That kit that Antique Electronic Supply makes is little better than the Ramsey AM-1 as far as stability and audio is concerned. I hope I haven't talked your ear off, but I was totally fascinated to read about this project of yours!'73
[2098]
[Thu Jan 18 22:10:58 2007] fmtx.....
moo!
[16]
[Fri Jan 26 01:14:43 2007] fmtx.....
I always have terrible trouble with comment-related plugins that require me to put some line in the comment loop; I can never seem to find the right spot. Can anyone tell me where I should put the php line in my comments loop? I haven not modified anything much, and I would be very grateful. Thanks!
[318]
[Sat Jan 27 01:22:55 2007] fmtx.....
Bonjour! What a super websight! Very refreshing to peruse from where we live in Paris (France). I eat frogs and drink wine. Woold like more informatons on this. Best regards! Mikael.
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[Tue Jan 30 19:16:39 2007] fmtx.....
Superb! (I wrote something else and then I read below that I aint supposed ter. So I deleted it.)
[113]
[Sun Feb 11 08:25:31 2007] home.....
Max, Wheres pretty Baby? SIGHH I see Laya but not Pretty Baby.
[76]
[Sat Feb 24 11:50:00 2007] catradio.
Read the saga of CAT RADIO today. Very impressed, it embodies the spirit that keeps Free Radio ALIVE. I operate a SW 10 watt am station here in the UK, 6278khz BYCROSS RADIO (INTERNATIONAL). Striving to bring you something a little different in a spectrum of computor controlled channel blasters!
[322]
[Wed Feb 28 06:02:03 2007] home.....
Good morning, Max. This thing is located on the north side of the air base in Anchorage:http://i94.photobucket.com/albums/l93/John_West_2006/Phasedarray.pngA Wullenwebber.John*******
[240]
[Wed Feb 28 08:48:27 2007] home.....
Here ya go, Max:http://en.wikipedia.org/wiki/FLR-9John*******
[103]
[Sat Mar 24 20:56:58 2007] catradio.
Fascinating story! At least in your instance there was a real owner. Not some jumbo corporation. Radio has gone to the dogs! Long live Cat Radio.:)
[199]
[Wed Mar 28 17:35:52 2007] home.....
03/28/07Wow!I enjoyed the info about LASERS.Thank you,Ed
[98]
[Wed Apr 18 02:08:00 2007] catradio.
Does the anybody really own the airwaves? Prove it
[62]
[Mon Apr 30 07:25:57 2007] lasermod.
Hi Max,A suggestion:It looks like you added an LC filter to notch out your local AM station. Since most hobbyists live in urban areas with multiple strong AM stations, you might want to go with a low pass filter to take out the entire AM band. That would make the circuit more immune to other RF gear as well.John*******
[391]
[Tue May 1 18:09:33 2007] lasermod.
Hi Max,That sounds like a pretty simple alignment procedure to me.As an afterthought, almost everyone now has a PC and could use freebee audio software to act as a low freq scope. Add a divide by 10 chip for example and you could use to to set something like the FREQ adjust quite accurately. Or use a reference to a specific square wave level to set precise audio input levels. Lots of possibilities.John*******
[469]
[Fri May 4 08:11:48 2007] home.....
Hi Max,You might want to mention to folks not to point the laser beam concentrator at the sun. Cook the detector real quick.John*******
[177]
[Sun May 27 16:46:08 2007] lasermod.
Qool stuff!-Quahog
[42]
[Sat Jun 9 09:33:14 2007] home.....
Hi Max,The Photo-Snooping circuit looks good, and removing it from the FM circuitry does clean things up a lot. Good idea.John*******
[171]
[Sun Jun 17 03:40:05 2007] lasermod.
Great photos! I'm rustling up a similar laser pointer serial data comms. setup, to be driven by a Picaxe micro (see Picaxe insights => www.picaxe.orcon.net.nz ). In fact a simpler approach to yours is at =>http://sci-toys.com/scitoys/scitoys/light/light.html#laser_communicatorHad you considered using a cheap telescope at the receive end?Regards- Stan
[439]
[Sun Jun 24 10:14:35 2007] classe...
hi MAX i m alex from greece . I am an amateur in AM BAND. 1600KHZ. I have an am pll exciter about 30watt output.I Want to help me on a linear amplifier about 250-300watt. do you have any circuit about this??
[258]
[Sun Jul 1 19:35:23 2007] classe...
This is an extremely well produceddocument, well done and thanks.I have not used a push pull pa beforebut intend to have a go, using yourdata.best regards Finbar
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[Wed Jul 18 08:09:45 2007] catradio.
congratulations, what a pity some people have little better to do than cause grief to others.I was a broadcast engineer some time back and on a Sunday morning we radiated test card(Television station) and a tape of the most boring music you ever heard. One sunday I took a load of records in and patched out the test tape direct to the transmitter (I thought!) after two hours of playing our own music to those on duty getting ready to open the station we got a call from the transmitter site saying how nice it was to have some decent music for a change!!!We got stuck with "performing rights" costs of about ten thousand dollars but pleaded that we were not radiating for entertainment but for station alignment so they dropped it! Thank God! We had been "pirating" with a power of 150 kilowatts!!! now thats some pirate station.Regards to your daughter and tell her to keep up the good work, books are wonderful things and sadly becoming obsolete.Kindest regards Clive
[1134]
[Thu Jul 26 14:58:27 2007] catradio.
i am a ham. i am also a pirate. i live in a small town in texas. i only go on the air a few times a year. i can transmitt up to 350 watts. it makes no sence why i enjoy the pirate life. i have made most of my equiptment.sounds like you have a great time. i guess we should be living in the 20's. too many rules and regs today.keep up the good way of life.
[408]
[Mon Aug 13 04:06:12 2007] catradio.
From Bryan Sir Max:i am bryan , I am doing my thesis right now on pirate radio however, i got a hard time assembling the my this trasmitter ("islander" from braincambre500.freeservers.com)since got the hard time looking for parts in the Philippines, and not an electronic person.sir since you ceased from operation would you mind sir if you would donate your equipments to us here in the Philippines i am sure it would be of help in the opration of vegetable farming here since there are no station in the area. Sir ould you please help me the and my fellowmen. thank you.Bryan
[787]
[Mon Aug 27 22:46:48 2007] classe...
Hi Max. My name is Agus. I m enjoying as a ham since 1979 when i was in middle school. I am intersesting in class e project and i found in the net your very clear project page. I m reproducing your schematic for 80 mtr band and it works at least i can produce RF. My problem is the power output is only 120 Watt.By knowing my problem i came back to see wheter i m overlooking something.Could you share your experience about my problem? Thanks for your help. Thanks Max 73s fer u es family.
[588]
[Sun Sep 9 18:42:07 2007] amblog...
I am trying to find transmitting mica caps for modify Johnson KW Matchbox tuner for 160. Do you have a source for 2 each 350 pf. transmitting mica caps?
[201]
[Mon Sep 17 02:51:24 2007] amblog...
Hi Mr. Carter,Thank you for putting up a nicely done technical web page and for sharing your equipment-building experiences with the Net.Sincerely,Pat
[198]
[Sat Sep 22 22:02:20 2007] lasermod.
I am looking for a receiver schematic to receive input from a laser beam for school. Do you have the schematic for the receiver you built for your project? If so can I get it? Thank youDavid
[273]
[Thu Nov 15 01:21:56 2007] fmtx.....
i am want PCB set modifications MPX96Thank you everymuch
[114]
[Fri Nov 16 10:31:45 2007] catradio.
Brilliant. truely Brilliant. My name is Rob, and I was raided this year in the UK for operating a 10 watt Shortwave pirate station from my boarding house. We were on air tuesdays ,Thursdays and weekends for a year and a half untill 'The Knock'. At 15, i am Offcoms youngest SW pirate. Good job they didn't hear of the AM MW set that is still running at weekends...Cracking read, and all the best.
[432]
[Thu Dec 27 15:55:59 2007] lasermod.
Hi Max.I enjoyed reading about Cat Radio and your various transmitter projects. It is nice to know that there are still some persons around who want to tinker with electronics and share their experience with others - even though you may buy almost every conceivable gadget on the earth on eBay for next to nothing.A. S.
[422]
[Mon Jan 7 16:30:44 2008] fmtx.....
Please send us the PCB design, and the complete part list of of the circuit
[87]
[Mon Jan 7 20:36:44 2008] home.....
Good star story, Max.
John
*******
[62]
[Tue Jan 8 06:30:59 2008] viewcoms.
I will forward your request to my PCB design guy..
Max
[81]
[Tue Jan 8 08:33:23 2008] max......
Thanks John!
(LED illuminated star here.)
Max
[155]
[Wed Jan 16 17:48:02 2008] classe...
Nice page. I just got done building a 50 watt AM transmitter a little while ago using a mosfet. I don't think the design counts as true class E but it puts out a clean good signal.
I find mosfets are the best way to build larger lower frequency transmitters today from longwave up to 3 or 4MHz.
If your interested here's my design..
(note it was kind of a makeshift rig and was my first ;)...
http://i92.photobucket.com/albums/l12/defectivemachine/AMTXfinal.jpg
Anywho check out our message board at..
http://darkliferadio.proboards100.com
[615]
[Tue Feb 5 23:49:12 2008] amblog...
my compliments for your story, it's like my story , i have many years ago a small radio in my village , but i must shut down for bad laws in italy .
massimo.gan@tele2.it
[193]
[Fri Feb 8 08:24:25 2008] viewcoms.
It sounds like Massimo and I have something in common.
Max
[79]
[Thu Feb 14 19:06:25 2008] home.....
Hi Max,
Just checking in. I'm doing OK. Hope you are too.
John
*******
[111]
[Mon Mar 10 17:14:48 2008] home.....
Hi Max,
Just me. I was down for a while with something that seemed a lot like the flu.
But now I'm better. How 'bout you?
John
*******
[190]
[Tue Mar 11 12:15:40 2008] home.....
Nice site. A good couple of hours entertainment. (Make yourself the PDM modulator! You'll love it!)
FFFR,
Andy
[154]
[Mon Mar 17 04:49:15 2008] viewcoms.
Thank you Andy,
Actually, I tried for several months to get the PDM to work.. without success. So I went back to using iron..
Max
[170]
[Mon Mar 24 21:29:26 2008] classe...
Lo felicito por su excelente descripci¨®n del amplificador Clase E de 200 vatios.
E realizado una sabana electr¨®nica en Excel, que me gustar¨ªa enviarle, donde desarrollo las sencillas formulas de Mark Mallory.
Entrando los valores del ejemplo de Mallory, da los valores esperados.
Entrando los valores de su amplificador, algunos no me coinciden y me gustar¨ªa conocer su opini¨®n al respecto.
La resistencia de carga en mis c¨¢lculos es de 22.2 ¦¸ y usted habla de 10 ¦¸ en su circuito
El condensador del tanque me da 2.433 pF y usted coloca 5.500 pF ( 0.0055 uF)
Me gustar¨ªa saber su correo para enviarle dicha sabana de Excel
Atentamente,
Herbert Botero B.
antecol@une.net.co
[828]
[Tue Mar 25 09:34:04 2008] viewcoms.
Thanks for the nice comment, Herbert.
I went back and recalculated the inductor and capacitor values for the 1.71 MHz class-e AM transmitter and discovered an error in the design instructions given in the web article. The confusion comes from the fact that the 1.71 MHz circuit is a push-pull design, whereas the Mallory circuit is single-ended. The error (my error) is in the P (power) term in the first equation (calculating for L). Since the power is shared by two tank circuits, the P term in the first equation should be 1/2 the output power. I did not make that clear.
I have re-written steps 1, 2 and 5 to clarify the design procedure. Please retry it - use 200 watts for P.
Here are the results of my calculations:
Calculated L = 1.07 uH
AL value (for T400-2 core, from table) = 185
Calculated turns (on T400-2 core) = 7.6 (rounded to 8)
Calculated C = 4829 pF (I used 5500; I happened to have ten 1100 pF mica caps on hand)
Calculated Z = 11 Ω (approx. 10)
I don't have contact information for Mark Mallory. If you like, you can send the spreadsheet file to me as an email attachment, or upload the file here.
Sorry for the confusion.
Regards,
Max
[13]
[Thu Mar 27 05:17:54 2008] viewcoms.
As a result of the above exchange, I put a CALCULATOR on the class-e equations page. Click: /classexmtr/classecalc.html
Max
[13]
[Sat Mar 29 00:10:12 2008] catrad...
Dear Max...I enjoyed reading of the escapades of Cat Radio! Your site is very interesting and your construction work looks superb.
I heard my first pirate back in 1969 (part of the Falling Star Network out of NYC)...although it has been quite a long time since I listened regularly, I have heard several hundred pirates in my day.
Last summer I was able to hear Radio Free Berkley from the car on a trip to northern California...what a nice find.
If you get a chance and have a tape of any of the broadcasts, I encourage you to post them here as .wav files.
Again, thanks for the interesting read...Bill Martin
[677]
[Tue Apr 1 05:21:10 2008] viewcoms.
Thanks for the nice comment, Bill! I'll consider your suggestion.
Max
[63]
[Wed Apr 9 22:23:04 2008] classe...
Hi! Enjoyed reading your 200W Class E article. How did you avoid saturating the core of the PA system transformer (or 115VAC-115VAC isolation transformer given that aboput 5A DC is passing through it? Thanks, Floyd K2DUV 2sailors@verizon.net
[259]
[Fri Apr 11 06:06:07 2008] viewcoms.
Thanks for the comment, Floyd. I had no problem with core saturation. There's a nice big ol' transformer in that PA amp. Lots of iron mitigates against the possibility of core saturation. I added a blurb in the article about it.
Max
[218]
[Thu May 1 05:46:04 2008] laser....
Hi Max,
I've been busy the last couple of days sorting out my half million SMT resistors and inductors, and riding buses. Tedious and tiring.
I saw an ad for DVD burners for $21 a piece. Should be able to grab some high power lasers real soon.
John
*******
[314]
[Thu May 1 08:29:22 2008] classe...
RF POWER LINEAR AMPLIFIER
[35]
[Fri May 2 07:53:29 2008] viewcoms.
You might want to get some protective eyewear, John. My understanding is that laser goggles are selected according to the wavelength of the laser you are using, i.e., so as to absorb in the wavelength range of that particular laser.
Max
[270]
[Fri May 2 08:46:05 2008] viewcoms.
Class-e definitely ain't linear!
Max
[61]
[Fri May 16 05:48:42 2008] amblog...
BLOCK DIAGRAM EN FUNCTIONS OF EACH BLOCK
[50]
[Thu Jun 5 14:08:53 2008] classe...
sir,
you are not giving audio in put stage clearly please give this through
email illiraj55@yahoo.com thanku for yours corcut idea
[158]
[Thu Jun 5 14:12:46 2008] classe...
give a simpul shmatric of am tramsmitter with long range i think you used mpspet hi watt with parell more than above and increase the range
of trannsmitter and watt also
[185]
[Fri Jun 6 07:22:23 2008] classe...
illiraj55@yahoo.com,
The [class-e AM transmitter] article shows the transmitter circuitry and gives some suggestions for interfacing a modulation amplifier. (The audio modulation power is supplied by the modulation amplifier.) As suggested by the article, many commonly available amplifiers, tube or solid-state, can be used - public address, home audio, car stereo, etc. The details of the modulation amplifier are beyond the scope of the article.
Max
[476]
[Fri Jun 6 08:36:06 2008] viewcoms.
I've never had very good luck paralleling MOSFETS. Must be doin' somethin' wrong..
Max
[112]
[Tue Jun 10 21:16:32 2008] home.....
Max,
I'm curious if you're the same Max Carter I served in the Air Force in Germany with. Ayers Kasern near Butzbach, Germany in the late 60's. I recall we were both into stereo's, built the "Brute 70" power amp. from scratch. Parts from Allied Radio & others. It does look like you in the pix. Let me know. You may respond to alucke@juno.com.........Al Luckey
[407]
[Thu Jun 12 05:48:44 2008] viewcoms.
Yeah, I'm the same guy, now 40 years older, retired and living in Wyoming (29 years). I still have that Brute 70, modified and repaired over the years but still going strong. I remained interested in electronics after leaving the service and have more or less made a living at it, plus doing a lot of hobby stuff.
Max
[341]
[Mon Jun 16 01:41:32 2008] home.....
Nice site. Enjoyed reading about your radio broadcasting. Thanks for sharing that and other projects.
Kind regards from 'Down-under'
[152]
[Mon Jun 16 16:29:13 2008] viewcoms.
Thanks 'Down-under'!
Max
[51]
[Tue Jun 17 14:30:08 2008] viewcoms.
give simpul hi watt long range transmitter you are not giving
smematric about 200w transmitte
give simpul ababul productto make
simpul
[160]
[Tue Jun 17 14:47:19 2008] viewcoms.
sorry sir,
parallel mospet means in rf out put stae we used pus pul type two mospet and increase this range through increase the pear of mospet like two pear & 3pear and increase volteg
like (ups or invertor) circut .and increase the range thanku for reading
and ancer me (112)
illiraj55
[335]
[Wed Jun 18 09:47:42 2008] viewcoms.
Here's a block diagram of the class-e AM transmitter (about the same as any other AM transmitter). Note that items marked "external" are not described (except in a general way) in the article:
Hope this is helpful.
Max
[243]
[Wed Jun 18 10:14:00 2008] viewcoms.
illiraj55,
Yeah, I know that in theory one can parallel MOSFETs to increase the power handling ability of the stage. I just have never had any luck doing it at the frequencies and modes (class-e) that I've tried..
Max
[259]
[Fri Jun 20 12:56:58 2008] home.....
sir
what is class e type transmitter and other a,b,c type transmitter
illiraj55
[131][-1][-1]
[Fri Jun 20 14:09:04 2008] viewcoms.
illiraj55,
Class A - output MOSFET (or other device, i.e., bipolar transistor or tube) conducts during 100% of the RF cycle time,
Class B - output device conducts 50% of the RF cycle time,
Class C - output device conducts less than 50% of the RF cycle time (typically about 45%),
Class E - output MOSFET acts as a switch, conducts only when the drain voltage is at 0. This is usually around 50% of the RF cycle time, but can vary depending on circuit parameters.
Look on the internet for further explanation of the various "classes". Wikipedia is usually pretty good.
Max
[685]
[Mon Jun 23 12:43:37 2008] viewcoms.
sir ,
still ihave adout 3.42 mhz carrier source means ?where i get this get idea details thanku for ancer me
illiraj55@yahoo.com
[184]
[Tue Jun 24 06:08:30 2008] viewcoms.
illiraj55,
Quoting the article: "...a signal generator, crystal oscillator, VFO or other source.." This would probably work:
Max
[181]
[Wed Jun 25 00:17:40 2008] viewcoms.
THANKU SIR
ILLIRAJ
[44]
[Thu Jun 26 12:06:58 2008] viewcoms.
max
i have a 500w/1kw transmitter circut can you give idea to make simpul this ai 1.9mb give your email add i give you this thanku
illiraj55@yahoo.com
[202]
[Thu Jun 26 13:17:29 2008] viewcoms.
Illiraj,
I emailed you regarding this. Check your email.
Or upload the file here.
Your choice.
Max
[148]
[Thu Jun 26 23:52:22 2008] classe...
RF POWER AMPLIFIER DRIVER
[35]
[Fri Jun 27 06:46:19 2008] viewcoms.
You might try phrasing your comment as a complete sentence..
Max
[88]
[Fri Jun 27 11:55:49 2008] viewcoms.
sir,
i sent this circut diagram through uplod option but it not give finish command after sending it will be heng up so if you are not receive than sent me e mail clearly my e mail illiraj55@yahoo.com and write (max) also then i understand uoy know there is more adv mels are comming and confus the peapul thanku sir
[342]
[Sat Jun 28 15:02:59 2008] max......
For what it's worth, here is a block diagram of the AM stereo transmitter Illiraj55 is referring to. About the only difference between a "regular" (mono) AM transmitter and a stereo one is the addition of the stereo processor/exciter. This one happens to be a C-QUAM exciter.
Note that the outputs of the processor/exciter consist of 1) a phase-modulated carrier at the transmitter's RF operating frequency and 2) a pulse-width modulated (PWM) AUDIO carrier, usually at around 100 kHz. The PWM stream is filtered in the modulator to remove the 100 kHz carrier and the two signals (RF carrier and now analog audio signal) are combined (multiplied) in the RF power amplifier to produce the composite stereo output signal. The composite signal is processed at the receiver to extract the original stereo audio signals.
I don't think AM stereo is used much anymore, at least in the US.
Hope this is helpful..
Max
[1005]
[Sun Jun 29 11:54:12 2008] viewcoms.
max
in our country radio transmitter is ilegal i heard that is in india . sir any idea to make transmitter in legal purpose houw can i get licance or any friquncy that is free for transmitting or hobby purpose any ligal sdvice if you know then give idea to solve my problame thanku sir
[306]
[Sun Jun 29 15:46:46 2008] max......
Illiraj55,
I don't know how to get a broadcasting license in India but, like many places, if you have the equipment, there is not much that prevents you from broadcasting WITHOUT a license.
(I didn't actually say that..)
My suggestion is to use FM. FM transmitters are generally simpler and cheaper, antennas much smaller, and coverage (transmitting range) is usually equal to or greater than AM for wattages less than 100 or so.
I don't know if low-powered FM transmitters are available in India, but they are available worldwide.
Type into Google terms like 'low-power FM', 'LPFM', 'pirate radio', 'FM transmitter', etc.
Hang around pirate radio forums like alt.radio.pirate or alt.pirate.radio:
groups.google.com/group/alt.radio.pirate/topics?hl=en&lnk=srg
groups.google.com/group/alt.pirate.radio/topics?hl=en&lnk=srg
Drop a question on there about where to get transmitting equipment.
Some sources that I know about are:
www.ramseyelectronics.com kits mostly; require soldering
www.northcountryradio.com kits; require soldering, adjustment skills, test equip
www.progressive-concepts.com ready-built mostly
There are many others.
Importation is a problem in some countries. I don't know about India.
It appears that the FM band in India extends from about 90 MHz to 108 MHz, about the same as everywhere else in the world. For a list of FM stations in India, see: www.asiawaves.net/india-fm-radio.htm Avoid frequencies on the list.
Max
[1739]
[Mon Jun 30 07:40:35 2008] amblog...
convercion cb radio to irf 530 final transistor
[63]
[Mon Jun 30 07:41:24 2008] amblog...
to radio cb
[27]
[Mon Jun 30 12:49:44 2008] viewcoms.
thanku max for your coparate i will quick come a anew topic thinku illiraj55
[87]
[Mon Jun 30 23:43:04 2008] fmtx.....
Keep up the good work! It's nice to see stuff like this on the net.
Greetings from a fellow pirate.
[125]
[Tue Jul 1 05:25:05 2008] viewcoms.
Thanks, Fellow Pirate.
Max
[49]
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