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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

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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  U3S single BS170 briongs already 1W at 5V! The PA is good 10MHz and lower but 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 filter now. 

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 and the ugly..  Left genuine Mitsubishi,  mid Ebay "good quality RD15HVF1" what appears to be an   IRFxxx  G-S = 1.29nF    re-stamped type  pins:  GDS instead of…

SOLAR EDGE 8k on air...

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50MHz  antenna direction SOLAR EDGE 8k the fun is gone  with 20dB  extra noise 12 hours a day The SOLAR EDGE  SE8k at 50m distance  contaminates the whole  HF and VHF spectrum  1 to 146 MHz  !! with noise and 200kHz separated digi trash this noise is maximum at the display opening in the case   it is generated by the EMC disaster CPU  The unit is still under guaranty so i can not open it to see what is wrong The provided HF filtering in the PV power lines did not help  since the  RFI is not on these lines  Wire mesh over the display area weakened the noise just a tiny bit The single phase Solar Edge PV converter with optimizer seems to be clean So what is wrong with the SE8k ??


Antenna at minimum noise

474.2 kHz  no sign anymore of WD2XSH/17   last time seen TA decodes was 25 March  Might be that transmissions are stopped fttb  the Aurora did kill all DX on the low bands

U3S 5W PA continued

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My   U3S project  is  almost finished it took a lot of solder smoke.
The plan is a WSPR radio beacon operating  as PU7ZWT from HI11ln
at the allowed bands 160m 80m 15m 12m 10m and 6m
with about 5W power at 12 10 and 6

The 5W PA could not reach 5W level  at the higher bands.
With the PA  inside the case using the bottom of case as heatsink is effective 20W DC input it stays cool.
But i had some self oscillation issues and unwanted reboot at TX start.
No short thin coax but a twisted wire connection between U3S and the LPF unit resulted in more output.
A single BS170 reached 700mW at 5V 28MHz and 600mW at 50MHz
With this drive level it should be easy to reach   5W with the PA if the power gain was 10dB
but is is not.

Important is reading excellent manual and application notes before starting  contructing
That I did not good enough.

My notes:

110R to the gate of the RD15HVF1 this mod must be done.
2  The "Key"  signal  is used to switch the PA 12V at TX time.
 I skipped the exist…

474.2 kHz

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27 and 28 March    Aurora  no WD2XSH/17  decodes


last night with repaired antenna  25 March
50+ decodes again
strongest -9  no other TA signal here
2017-03-26 01:14  WD2XSH/17  0.475640  -9  0  FN42pb  5  PA0O  JO33hg  5630  49 

Desktop QTX s QRP  but  been decoded  by WD2XSH/17 and N1BUG

WD2XSH/17 last night  14  decodes rather weak  -23dB  at best

Today in beautiful weather I showed my antenna's to Marten PA3EKM he brought me the right type s left - right manipulator switch for the 630m tuner.
Then saw the W- Beverage was broken most of the wire laying on the ground and in the ditch but it still receives. 

 2017-03-24 23:52  WD2XSH/17  0.475641  -28  0  FN42pb  5  PA0O  JO33hg  5630  49  2017-03-24 22:20  PA0O  0.475643  -26  0  JO33hg  0.2  EA8/DL9XJ  IL18sm  3335  224  but first time spotted in EA8


Now with the IRFP4227   in the QTX instead of the IRF540Z types
 I had no more blown FET's even not with a short in the coax
It is fail save now.

And  easier remote tuning the V…

U3S continuing

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now using a FOX 27MHz TCXO in the Synthesizer v1.4 PCB
At 27.000.000 almost exact. The CAL setting for correction is disabled.
The 27Xtal  was generating around 27.003.0120
So now the drift is coming close to the K3 stability.
My old IC706  impresses me even more it can run WSPR stable at 144.489 MHz without the Icom optional 30MHz TCXO (obsolet)
Will not order a 30MHz VCXO  with the experience about TCXO's  i have now.



QRP LABS note about some TCXO having discrete frequency steps is unfortunately valid for this  FOX924-27.00
Intolerable a for PLL frequency reference of course.
If i had known that, obviously i would  have chosen a better suited type.
Tatien might be a choise it is a bit gambling.
The specification does not mention the method ,  temperature compensation or correction?  
My  23cm l.o 1050MHz by DF9NP PLL  uses a TATIEN 10MHz VCXO .
It does not suffer  frequency steps,  this PLL does not need an external reference.
That also means that the PLL chip is not correcte…

474.2 kHz WSPR Java quota exceeded..

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MW  one of the better nights




 2017-03-20 02:50  WI2XRM  0.475722  -23  0  EL98pd  1  PA0O  JO33hg  7368  41  2017-03-20 03:56  WI2XRM  0.475660  -25  -1  EL98pd  1  PA0O  JO33hg  7368  41  2017-03-20 03:26  WI2XRM  0.475711  -26  1  EL98pd  1  PA0O  JO33hg  7368  41  2017-03-20 02:34  WH2XZO  0.475737  -26  -1  EM85wb  1  PA0O  JO33hg  6882  43  2017-03-20 05:14  WH2XZO  0.475737  -27  0  EM85wb  1  PA0O  JO33hg  6882  43  2017-03-20 02:40  WH2XZO  0.475737  -27  -1  EM85wb  1  PA0O  JO33hg  6882  43 
35 decodes  2x -6
 2017-03-20 01:16  WD2XSH/17  0.475640  -6  0  FN42pb  5  PA0O  JO33hg  5630  49
TX was running  no failures a very wet night with high RF Volts  even with my relative low power
the antenna wire is very "hot"
2017-03-20 02:56  PA0O  0.475660  -26  0  JO33hg  0.2  N1BUG  FN55mf  5297  293 

Today for some time the map view did shut down after few seconds with error message:
The preferred correct term for an error is now: Oops something went wrong


Have had this o…