Locked Re: Q65 only decoding the strongest station #decode

Buddy Morgan

I suspect overlaps, also. Here in the South Eastern United States, some of us are using Q65-15A. These signals are 433 Hz wide. You can get five signals into the passband. I have had multiple decodes. We have our WSJT Activity Night, every Monday. We get on the bands, 2M and higher, xxxx.174 MHz, FT8 and recently xxxx.170 MHz Q65-15A. Be most happy to have some of you, join us.

Buddy WB4OMG EL 98

-----Original Message-----
From: Charles Suckling <g3wdg1@...>
To: main@wsjtx.groups.io
Sent: Wed, Dec 15, 2021 3:14 am
Subject: Re: [WSJTX] Q65 only decoding the strongest station #decode

Hi Wayne

A couple of possibilities that I can think of that may be coming into play.

Firstly, multidecoding is not as sensitive as decoding signals individually, so the signal that does not decode may just  simply  be below the threshold.  

Secondly,  if the signals are overlapping,  the one that decodes can  block out the other signal. 

Things to try are to attempt a manual decode of the signal that does not decode, possibly with a lower value of Ftol (btw Fol cannot be set to 0!).  You could try a value such as 50Hz, or maybe a little lower, but be careful to set the mouse cursor exactly on the lowest tone of the signal. Invoking a manual decode I believe uses Deep decoding automatically, which may gain you a little more sensitivity compared to Fast. Manual decoding is either by double clicking on the signal on the waterfall, or single click and press Decode button. 

If you were saving wave files, making these available would help further analysis.  


Charlie DL3WDG

On Wed, 15 Dec 2021 at 01:00, Wayne Newport <wazzan1@...> wrote:
hi all, just stated using Q65 submode A, T/R 30 sec. I am decoding single stations ok but if there are two or more signals on the screen I am decoding only the strongest station.
My settings are Single decode NOT ticked,
Decode menu- FAST selected.
F Tol is set 1000hz
Receive audio level is set at 40db on the graph
any ideas anyone.
cheers Wayne VK4WTN

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