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| To: | "[email protected]" <[email protected]> |
|---|---|
| Subject: | Re: LF: what causes this on wspr |
| From: | John Langridge <[email protected]> |
| Date: | Wed, 1 Jul 2015 22:12:07 +0000 (UTC) |
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>do you see this pattern from your SDR
? When I am transmitting and subsequently overloading the SDR, yes. It has similar, regular spaced sidebands away from the center freq. In fact, if you go to my QRZ page bio, the topmost picture is a grabber shot of my WSPR signal signal overloading the SDR along with another WSPR station about 200 miles north of me. 10w ERP.... the RX antenna at 1 mile is a resonant, well match toploaded vertical (about 10m tall) so its swamped with signal and does not deal well with it. This may not be the same situation but it sure looks familiar as overload. 73! John KB5NJD / WG2XIQ From: Graham <[email protected]> To: [email protected] Sent: Wednesday, July 1, 2015 1:56 PM Subject: Re: LF: what causes this on wspr Tnx John
The over drive option has a flaw ,as far as I can
see , as to where the frequency
spacing of the side bands originates , yes,
psk31 , over driven produce's IMD but wspr is
a single phase cont tone system
do you see this pattern from your SDR
?
Tnx- G,
From: John Langridge
Sent: Wednesday, July 01, 2015 5:37 PM
Subject: Re: LF: what causes this on wspr Two real options:
1) over driven audio, as your picture caption suggests
or
2) the rx site is close to the
TX station and is overloading the receiver. I have a remote Ensemble II LF
SDR at a site 1 mile away from my TX and I overload it like this regularly but
its not because I'm over-driving my system. The signal is simply to strong
for that distance and the receiver is in an overload condition.
73!
John KB5NJD / WG2XIQ
From: Graham <[email protected]> To: [email protected] Sent: Wednesday, July 1, 2015 11:24 AM Subject: LF: what causes this on wspr what causes this on wspr
This takes some doing ...... but how
to do it ?
G, |
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