Hello Jeff, and the rest of the group of course....... Great to see you here.....worked each other a lot of times in 144MHz contests......... Well, I'm planning to take down the remaining parts of my
Hello all, I nearly finished my 50V/15A cont. powersupply. Coming week I'll do some tests to see if it works well. Unfortunatly I can't test the current limiter, as I doesn't have a suitable dummyloa
First off all thanks to Jeff for delivering the adress of an distributor in the Netherlands. Unfortunatly they only deliver to firm's and not to individuals....... Meanwhile I offered some of the dif
Hello all! I just finished and tested the powersupply that should power my 136kHz station. 50V/16Amp continue without any problem. That 16Amp is the point where I set the current protection, but the
Hello all, Finally I got all the important components to get started with G0MRF's transmitter, as published in Radcom Jan-2003. I still have some questions left, and as I don't want to re-invent the
Hello all, Rather busy this weekend, so only a short mesage of thanks to Wil, PA0BWL and Werner ON6ND for their comments on the antenna question, and thanks to Rik, ON7YD for his interesting explanat
Hello all, I completed my G0MRF-transmitter, and today I've done the first tests on it. All is working fine, except the output circuit. As far as I can see now, the outputt-transformer on the FET's i
Well, thanks all for your comments and tips. It helped me, and I got some ideas about what might be wrong. I soldered out the transformer, and did some measurements on it. Dispite all precautions I f
Hello all, well I rewound the ouput transformer. Again I have problems, and when checking the signal on a spectrum analyzer I found that it is peaking on the second harmonic. So it transmits the main
Well, at least I got a lot of good info from several of you, thanks! Ouput phasing etc, I am really questioning if I'm doing it wrong or right. I made the transformer exactly as it is in the schemati
Just did some more tests........... Used another type of core, 3C11 Same problem is still there; tried to damp with 1nF+22 Ohm serie, doesn't help. Tried other phasing......didn't work either. I am u
Well, thanks to that single sentence from Laurence in his last posting I finally got out of the nasty problem! "as long as the coil wind direction doesn't change at the tap point" and, suddenly I rea
Hello all, due to circumstances I'll have less time to work on the transmitter. Meanwhile I tried several other transformers, as well as some other things, like disconnecting the Scottky diodes and t
Hello all, Last weeks I spend a lot of time rewindg transformers, changing the circuit time after time, and even changing the FET's. All in all I have little progess sofar.............. Maybe there i
Well tonight I finally managed to get the G0MRF transmitter running fine!!! Great to get this far after all the frustrating weeks of experimenting etc......... I took apart another monitor HV-transfo
Hello all, With the transmitter working well now, I need to check the protection systems. Current protection works good and turned out to be very fast. I have some troubles in adjusting the SWR prote
Hello, You'll all remember the problems I had to get this "thing" running. I did do some modifications as described by Jim, M0BMU: -I took out C23, 470nF -Inductor L4 (was 11 turns on a T94-2 core) c
That would be a pitty......... I do my transmitter and power supply running, but not had time to built the coil and antenna... Hope to be on this winter........ 73 Dick, pa4vhf (jo32eh)
Well, I am here, and also enjoying the nice weather AND building some test equipement in order to align/measure future 136kHz antennas.................... Dick, PA4VHF
Hello everone here, After finishing the power supply and transmitter a long time ago, I finally have the TX-antenna ready at my parents house. (dismanteld the old 4 times 9 for 144MHz) Just need to d
