Hi Adrian,
we do not recommend using narrow IF filters with WSJT-X, they will
likely interfere with the SNR estimates with little or no advantage to
decoding ability. If you are suffering from very strong adjacent signals
and turning off the rig AGC, combined with careful RF GAIN adjustment,
does not help with decoding then as a last resort a notch filter or
reduced IF bandwidth can be tried, but do not expect accurate SNR
estimates if you do that.
73
Bill
G4WJS.
On 10/02/2021 16:33, Adrian wrote:
I used the 600 Hz FTDX101MP roofing filter tonight for RX success on 160m VK
<>USA FST4-60 and FST4-300.
My experience so far tells me it is beneficial to making the contact, It
seems to double the gain on the RX signal in the window.
-----Original Message-----
From: Claude Frantz [mailto:claude.fra...@bayern-mail.de]
Sent: Thursday, 11 February 2021 12:09 AM
To:wsjt-devel@lists.sourceforge.net
Subject: Re: [wsjt-devel] WSJT-X v2.3.0 Oc42df.
On 2/10/21 10:58 AM, Adrian wrote:
Hi Adrian and all,
The top RTTY contesters have learned that -- they have abandoned dual
peak filters and now use 500 Hz bandwidth, narrowing only in the
presence of very strong signals in the passband.
The bandwidth alone is not the whole story. Although I'm not a top RTTY
contester, I have developed and used a constant delay discriminator over
many years. You can find details here:http://dj0ot.darc.de/discri.pdf.
The picture on the tuning scope display is here:http://dj0ot.darc.de.
Best wishes,
Claude (DJ0OT)
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