PA0O ham radio

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WSPR dx ing

some "normal DX-ing at 80m CW split operations T88XH 3506kHz S21ZED 3522 kHz heard 5U5R 9G5X but JA US only time Last night 474.2kHz no exceptions not a good 630m night. In south Germany better ( as usual) I have strong decodes of WD2XSH/17 -10 but no propagation deeper in USA. Murphy this time it was a broken 12V regulator that normally never happens ;-) TX worked stable now ANT current over 100% highest ever but propagation did not favor my QTH WSJT-x missed some good looking traces again strange no restarted PC 2017-03-15 00:52 WD2XSH/17 0.475638 -23 0 FN42pb 5 PA0O JO33hg 5630 49 2017-03-15 01:04 WD2XSH/17 0.475638 -10 0 FN42pb 5 PA0O JO33hg 56...

WSPR DX

Last night 14 decodes of WD2XSH/17 best -14 Seems like every night different challenges Murphy is around all the time. Antenna current dropped to zero every now and then with some relation to the higher voltage. Basicly 3 things could be wrong: Antenna, cable or Variometer . The last thing would be the worst but this Hagenuk Variometer is very professional build Thick Litze coils 4mm and all coated with a thick layer epoxy. Culprit was old army RG213 PL259 brown isolation type This is a short cable to the outside tuner. I was using it for 160m also. So this 475 TX is a good weak spot tester. And the TX with IRFP4227 can survive even short circuit in the antenna. Hagenuk Had my best TX result last night 140W DC input More ...

WSPR DX-ing

WD2XSH/17 50 decodes last night best snr -9 2x impressive signal No other TA call seen possible XSH had extra high ERP last night 2017-03-12 02:46 WD2XSH/17 0.475639 -9 0 FN42pb 5 PA0O JO33hg 5630 QTX now IRFP4227 plastic en drain isolated from cool flange that isolated drain tricked me i had +V supplied over the heathsink for the IRF540 but that did not work with this IRFP i needed to power it over pin2 although the document shows that cool flange and pin 2 are both drain But if could not get it to work stable, the some sort of wild oscillations that killed the IRF540 appear sometimes found that the oscillation was caused by the 475 band filter and puls shaper it is stable now it stays cool only the air coils heath up Ths IRFP is...

U3S project 1rst time on air

After the 28MHz freq drift stabilized a bit i connected my antenna the U3S for its maiden test. PD0OHW could decode the beacon that eventually is for him as he will use PU7ZWT HI11ln but still under test and waiting for a new Si5351A pcb . My attempt to replace the Si chip on the defective PCB did not help the Si5351a error still pops up on the U3S display at boot the I2C signals are present and the 3 ports carry RF so the replaced Si chips work but can not communicate with Progrock or U3S For unknown reason Hans Summers told me the Si5351a is not pre programmed standard. original stamp Si5351a 5351 B4DQ 447 replace chips stamp 5351 BHJN 632 although it was relative easy to replace this very small device both PCB still suffer same problem I was decoded with 300mW at 28MHz 2017-03-11 06:30 PA0O/U 28.126152 +30 -4 JO33hg 0.2...

4 decodes of WD2XSH/17 all -29 2017-03-06 01:26 WD2XSH/17 0.475648 -29 0 FN42pb 0.1 PA0O JO33hg 5630 49 2017-03-05 23:04 PA0O 0.475602 -30 0 JO33hg 0.2 SV8RV KM07ks 2042 142 2017-03-05 22:58 PA0O 0.475602 -25 0 JO33hg 0.2 SV8RV/1 KM07ks 2042 142 2017-03-05 22:10 PA0O 0.475601 -27 0 JO33hg 0.2 EA7HPM IM67xj 2017 214 QTX and IRF540Z ( my last one i smoked 9) this version has about 2500 pF G-S It can run at 5...

WSPR today U3S deluxe project continued

last night no TA decodes i.e. WD2XSH/17 not seen anymore heard by SV8RV/1 and EA7HPM just over 2000km but surprize this morning 28MHz open to VK 2017-03-05 09:30 VK3KCX 28.126060 +3 0 QF22qd 10 PG0DX JO33ce 16471 312 2017-03-05 09:30 VK3KCX 28.126030 -8 1 QF22qd 10 PG0DX/1 JO33ce 16471 312 2017-03-05 09:16 PG0DX 28.126136 -12 1 JO33ce 200 VK3KCX QF22qd 16471 78 2017-03-05 09:20 PG0DX 28.126135 -4 -1 JO33ce 200 VK3KCX QF22qd 16471 78 ...