Hi Graham / All
First apologies to all for the test posts, it seems I have now
cleared the blockage somehow.
A couple more tests with that desktop computer which drifts (sound
card) failed to decode at fair signal levels, so it does
effect the capability of the system.
Today I have a locked carrier on 8970.05 generated in Speclab, I
have been looking at keying it, that will take another computer, and
it will take another to receive it. I can eliminate one by PIC
coding it but that would take longer. It will need to keep raining.
I go into the sound card direct from my RX antenna 24m away from the
sound card outputting -26.5dB into a bit of wire.
I haven't looked at the news group for ages may take a butchers,
Eddie
On 02/05/2012 19:22, Graham wrote:
If you leave the garden gate a-jar that should tidy the
signal up on its way past ?
-44 . that's the Op reported level ? so could be -50
/ -52 in wspr levels .. should be able to loose 45% , but
don't forget the s/n is the average over the time line , so
for a full capture, you could be ~~ 10 db over the limit ??
Are you using a pre-amp etc of just directly into the
sound card Ed, ?. some questions in the news group over
filters etc , I think one of the simple pre-amps may be
the best option ??
Tnx -G..
Sent: Monday, April 30, 2012 11:37 PM
Subject: Re: LF: WANTED 8KHz OP4H OPERA TESTER’S
OK Graham
Well you wouldn't want to radiate an untidy signal.
Second decode was -44dB, about 10dB / Noise in 46mHz. Signal level
varied and about 20% data lost in a block, XYL re arranged the
configuration of the dining table antenna, they just don't
understand!
73 Eddie G3ZJO
On 30/04/2012 22:23, Graham wrote:
Tnx Ed,
Steady carrier, that should be one of the advantages of
Op on 8Khz , no real problems with sound card 's and
frequency stability !
Look's like you may have some signals from PA soon ,
not sure what's happened to all the UK Tx stations , I
know there was a problem with having to inform the
met-office ..
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