Ah... Now you've said that 2030 transmission was 800ms late, I went back and re-decoded it. Even better result - appeared almost immediately Andy On 26 November 2015 at 21:39, <[email protected]> wrote:
Too late for 20:00, nil of 21:30, but then a good one at 21:00, +1.3 dB, 1.2s offset. ... Prx > Ptx ? ;-) Andy your spectrogram nicely shows the 0.5 Hz wide "noise hump" from the modulated transmis
1579 ohms * (10 m / 36145 m) = 121 microohms Joe, if you wanted you could almost copy Stefan's VLF coil described on his website, using thin enameled wire on a large water barrel. Assuming your ant
There was a discussion a while ago about ththe PA design used here http://www.gw3uep.ukfsn.org/100W_QTX/100WTX/PA_pa.gif and Alan amde the comment, I think that teh series capacitor at 1uF looked
Best 73, Markus (DF6NM) --Ursprüngliche Mitteilung-- Von: Andy Talbot <[email protected]> An: rsgb_lf_group <[email protected]> Verschickt: Sa, 28 Nov 2015 5:29 pm Betreff: Re: 3 p
Would I be right in thinking 137777Hz, 30 minute repeat, 2s symbols is running again? Inow appear to have an operational "Record Every to auto filename" option Andy G4JNT On 28 November 2015 at 19:5
You're talking a foreign language there - give me good old windows. Works every time No decodes on any of the recordings. But my noise level really is high around here. I may be fighting a losing
If you use two transformers on a 3-phase supply, with the primary windings in a SQRT(3) ratio, one connected in delta, and one in star across the supply; equal value secondaries when rectified will g
However much I searched, got nothing out of that one, or others from last night But at least managed that one decode a couple of days ago - so it does work Andy On 28 November 2015 at 21:56, Paul Nic
So it looks as if I'll have to use the leave-it-to-record and go to bed scheme. Then do the decodes next morning. Not being a night owl, live tests much beyond 2300 are not a favourite pastime here
A query ... So far I've been saving files every 30 minutes, to coincide with Joe's transmissions. And have even modified my prog to do that. BUT If I instead save one big file of several hours'
I left it running overnight, and have tried a few capture files selected at random. Some produce a garbage message, with symbol errors typically 200 or so out of 512 but this one at 0200 gave a corre
The 0630 recording gave a decode too found VO1NA list rank 22 reference phase 150 150 150 150 carrier RMS 4.329e+002 noise RMS 4.617e+001 carrier S/N 19.44 dB in 976.6 uHz carrier Es/N0 -7.65 dB carr
Many people use active receive antennas on the LF/MF bands; I use a commercial Procomm active whip which sits under my 137kHz Tee. It is happy to exist in the high E-fields generated when transmittin
Yes, there are plenty of options for normal Tx/Rx. In fact the existing C/O relay in the 137 transmitter provides more than enough isolation for that But I was on a separate active whip at the time,
Well, that was quick! The message appeared while the progress indicator was still showing 0%. But it was quite strong at the start of the 22:00 transmission, fading below visibility (0.12Hz B/W) towa
Rubidium sources are not absolute references, they always have a twiddle / calibrate control on them. Typical adjustment range is hardly ever more than 1 part per billion, and modern Rb sources will
