Today I will rewind that transformer with 3x10 turns. I will try to use slightly thicker wire I wound the transformer with 3x10 turns using thicker wire. On MF I cannot see any change. On LF there is
Congratulations to 2E0ILY, G0LUJ, EB8ARZ/2, K3RWR, and WA3TTS/2 for the great trans-Atlantic work last night! Well done all. After more than a year working toward it, I made my first two-way LF QSO w
http://n1bug.com/n1debug/ASB_LF_Amp-20171223.jpg Recall that last week I had increased turns on the output transformer from 3x5 to 3x10. That reduced heating of the FET but did not help to stabilize
Thanks Andy. I need more time to get my head around that equation. I'm still struggling with a near vertical learning curve on all of this. I never worked with ferrite (except in RFI suppression) unt
Hi David, That's an idea I haven't tried yet. I had tried a series C and R from gate to ground with no benefit but had not tried drain to gate. I'm really not sure where it is oscillating. I am unabl
Nick, I was very interested to read your email. I am sorry that you are also having problems with this PA but at least it isn't just me. A few comments threaded in below... I've been, sort of, follow
Hello Chris, Nick, and thanks Alan for your additions to this discussion. Should this amp be driven by sine waves?? I assumed you were driving it direct from CLK0 of the Si synthesizer in a U3S, with
Thanks for monitoring and for this interesting information Roger. I am back on MF with a new amplifier. Last night was a test run. Conditions were fantastic! Tonight I will be on looking for JT9 and
I've been getting across the pond well on WSPR lately. Today I have increased power by 4 dB on MF. I will be running the WSPR beacon and looking for any opportunity to make JT9 QSOs if I am not busy
I replied to Chris elsewhere on this and I agree about the oscillator being fishy. When it was working his numbers seemed right... 115.364 LO * 4 = oscillator at 461.456, seems right for a 461.5 kHz
Just think how many trans-Atlantic QSOs could be made. Some, like myself are very interested but the primary problem is no one awake on the east side of the pond at the right times! I have seen signa
Hi Joe, Yes, I have been following this trip very closely (would have been very sad and unfortunate but I am glad the team is safe. I wish them a comfortable trip home. That is why the temporary HF a
Hello Rik, Somehow I had not seen that before! It is excellent and answers almost all my questions. I'm still curious about one thing. QSB can be a big problem (as with EME, hi). This can make it dif
Hi Mal, I would very much like to try a JT9 MF QSO with you. I am not yet set up for QRSS, but am working toward that capability. We use JT9 in North America and I have worked VE7SL at 4050 Km when I
Last night was a test run for me. I had partially, but not completely removed the HF wires I had put up. This allowed me to run MF but I was initially down about 2 dB on power because the antenna res
Hi David, Thanks for the info. I still need to install the QRSS software and see if it will key my radio through the USB to serial interface I use with N1MM contest software. Meanwhile as noted in a
Thanks Mal. I will be there. I have removed the HF wires and once again have my full 5 watts EIRP. Will you be transmitting first or second? I will also CQ during the 2300-0100 time frame but will av
Yes, I agree! Let's coordinate this. I propose all EU transmit first, all NA second. I will post about tonight's activity on our NA 600mrg (MF) email list also. Maybe we can get more people in on the
Hello Rik, Thanks, but hmmm, when I TX in JT-9 on LF N1BUG doesn't have spots uploaded to PSK reporter site, although he receives me well. I asked on the WSJT group and they said it wouldn't as no pr
Middle of the WSPR area? I don't understand your question. With a dial frequency of 474.2, WSPR occupies 1400-1600 Hz audio range. Our JT9 runs from 1350 and DOWN. It is not in the WSPR area but belo
