Hi Roelof,
>Instead of the original bandwidth of 540 Hz, I used a filter
>bandwidth of 2400 Hz.
>This time WG2XJM produced a SNR of -28, whilst with a
>bandwidth of 540 Hz the SNR was -33.
That's strange.I would have expected the "better" SNR with the 540Hz filter.
Just for fun try a 100Hz or even 50Hz BW.
I've seen "improvements" in indicated SNR up to 15dB with Perseus.
>The reason that SNR's below -30 dB are rare, might be that in
>conventional receivers/transceivers it often is not possible
>to select a 500 Hz filter in USB mode and shift the passband
>center 1700 Hz in regard to the
>(suppressed) carrier.
That's true.
Only a few models could do that,e.g. my old TR-7 from 1978
could shift the passband in any BW in any mode in either direction (LSB/USB)
extremely wide I guess something around +/- 4 or 5kHz.
73
Clemens
DL4RAJ
>-----Original Message-----
>From: [email protected]
>[mailto:[email protected]] On Behalf Of Roelof Bakker
>Sent: Tuesday, March 19, 2013 10:12 PM
>To: [email protected]
>Subject: Re: LF: RE: Re: WSPR -2 SNR
>
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