To be able to receive at 500kHz I had to kill the 500kHz QRM source.
Yesterday I used my modified to 475-500kHz "RANEX" pocket radio to search the
the noise at 500kHz. That QRM was covering 500kHz for more than a week.
Constantly 50kHz wide and stable in frequency.
This time I searched at neighbours home but nothing found.
This MW receiver is a great noise sniffler.
There are lot's of noise sources in a home to be found.
I found an new one a CD player in standby mode.
Back at the radio the 500kH noise was gone suddenly..
I switched the CD player back on but that was not it.
Nothing found but QRM was gone.
Then replaced the 1:9 transformer back to the original in the K9AY rx antenna loop.
This one has a small core with high AL.
I tested a transformer with low Al not trifilar but "normal" wound 1:9
In the hope getting better result but it was no improvement.
The K9AY does not work at 137kHz it starts to work at 500kHz the signals are always weaker than from the 160m TX antenna inverted L with 26m vertical leg.
Measured 400uH- 50uH taps 5 trifilar turns
Testing reception of OK0EMW at 505.084kHz very weak but clearly a carrier
Still the 160 inv.L performed better...
In 2010 also DI2AM in Rostock could be received much stronger then OK0EMW.
But could not hear DI2AM possible QRT or QSY to 474kHz
WE6XGR was transmitting last night again
I saw reception reports already by G0KTN and SWL F59706
No reports from DL this time.
very weak decodes -25 to -30 I did see only a very faint trace at 499.500kHz.
I wonder why there are so few SWL's in this WSPR mode
Those SWL reports are really noticed
Instant reception result on WSPRmet.org what more could you want as a SWL?
much later when at sleep
between 01:40 and 5:30 very weak decoding again
"stongest" -21dB al far far worse than in 2010 2011 When WD2XSH/7 EM31JS could be decoded still ODX 7830km for this band
Yesterday I used my modified to 475-500kHz "RANEX" pocket radio to search the
the noise at 500kHz. That QRM was covering 500kHz for more than a week.
Constantly 50kHz wide and stable in frequency.
This time I searched at neighbours home but nothing found.
This MW receiver is a great noise sniffler.
There are lot's of noise sources in a home to be found.
I found an new one a CD player in standby mode.
Back at the radio the 500kH noise was gone suddenly..
I switched the CD player back on but that was not it.
Nothing found but QRM was gone.
Then replaced the 1:9 transformer back to the original in the K9AY rx antenna loop.
This one has a small core with high AL.
I tested a transformer with low Al not trifilar but "normal" wound 1:9
In the hope getting better result but it was no improvement.
The K9AY does not work at 137kHz it starts to work at 500kHz the signals are always weaker than from the 160m TX antenna inverted L with 26m vertical leg.
Measured 400uH- 50uH taps 5 trifilar turns
Testing reception of OK0EMW at 505.084kHz very weak but clearly a carrier
Still the 160 inv.L performed better...
In 2010 also DI2AM in Rostock could be received much stronger then OK0EMW.
But could not hear DI2AM possible QRT or QSY to 474kHz
WE6XGR was transmitting last night again
I saw reception reports already by G0KTN and SWL F59706
No reports from DL this time.
very weak decodes -25 to -30 I did see only a very faint trace at 499.500kHz.
I wonder why there are so few SWL's in this WSPR mode
Those SWL reports are really noticed
Instant reception result on WSPRmet.org what more could you want as a SWL?
much later when at sleep
between 01:40 and 5:30 very weak decoding again
"stongest" -21dB al far far worse than in 2010 2011 When WD2XSH/7 EM31JS could be decoded still ODX 7830km for this band
| 2012-12-17 01:40 | WE6XGR | 0.499500 | -26 | 0 | FN12 | 50 | PA0O | JO33hg | 5988 |
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