Posts

Showing posts from April, 2017

474.2 kHz MW

last 12 hours  474.2 kHz   had TX on 10%  again
80 unique spots
and 1 goody!  again EL96pd decoded

TimestampCallMHzSNRDriftGridPwrReporterRGridkmaz 2017-04-16 04:12  WI2XRM  0.475708  -28  0  EL98pd  1  PA0O  JO33hg  7368  41  2017-04-15 23:08  PA0O  0.475626  -27  0  JO33hg  0.5  SV8RV  KM07ks  2042  142  2017-04-15 23:20  PA0O  0.475626  -24  0  JO33hg  0.5  SV8RV/1  KM07ks  2042  142  2017-04-15 23:42  PA0O  0.475627  -31  0  JO33hg  0.5  EA5DOM-1  IM98xn  1713  200  2017-04-16 00:52  PA0O  0.475625  -26  0  JO33hg  0.5  EA1FAQ  IN71pn  1552  218  2017-04-15 23:52  PA0O  0.475625  -16  0  JO33hg  0.5  OH6GAP  KP22rd  1482  41  2017-04-15 23:00  PA0O  0.475625  -27  0  JO33hg  0.5  EW6X  KO45im  1445  71  2017-04-15 22:30  PA0O  0.475625  -13  0  JO33hg  0.2  OH2EAT  KP20xw  1437  46  2017-04-15 22:30  PA0O  0.475625  -23  0  JO33hg  0.2  EB3FRN  JN01mc  1416  199  2017-04-15 22:30  PA0O  0.475627  -28  0  JO33hg  0.2  EA3IW  JN11bj  1363  196  2017-04-15 22:30  PA0O  0.475627  -23 …

U3S Ultimate3 and 5WPA experience

Image
Sorry enough  after just a  few day's testing the U3S / 5WPA  at 50 / 28 / 21  Mhz   Output was lost  after 15:42Z  Monday 17-4   The FET RD15HVF1  died  possible by statics? 1 genuine left but repairing this 5W PA  ? A lot of effort and trouble  to bring 1W to 4W at 28MHz  The U3S single BS170  already is 1W at 5V! I thought that it would be an easy job to have 5W+ with the 5WPA RD15HVF1 But no way! something must be wrong somewhere the power gain is 0 - maximum 6dB only The 5W-PA is good for 10MHz and lower but very disappointing at higher bands.
The signal from the U3S straight from the Si5351a needs to be filtered before it drives the RD15 and after the 5W-PA again i think  Far from sinus shaped signal at the output of the PA behind the LPF filter. 

Be aware! the fake RD15HVF1 is still offered at eBay  5 for 5$ It was only my 2nd bad buy at eBay  of many purchases.      After solder tip eating  SOLDER core wire CF-10 B-2  0.6mm   that smells like cat pee.  The good  the  bad …