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[Linrad] Re: Suspend linrad during TX
- Subject: [Linrad] Re: Suspend linrad during TX
- From: Joe Taylor <Princeton.EDU; joe@xxxxxxxxxxxxxxxx>
- Date: Thu, 23 Apr 2009 08:28:12 -0400
> Linrad needs some way to be suspended while in the transmit mode.
> Anyone have any ideas along this line?
You did not elaborate on why you want to do this. I can
imagine two reasons: to kill the audio while you are
transmitting, and to prevent filling the waterfalls with
hard-on-the-eyes white (saturated) stripes.
I kill the audio by having a small relay switch off the line
to the speaker. A capacitor in a simple circuit holds the
relay in the "sound off" state for a time just larger than
the Linrad's processing delay, so I don't get annoying
transients at the end of a transmission.
To prevent horizontal white stripes on the waterfall I
modified the screen display routine so that whenever the
number number of white pixels would exceed a specified
limit, the whole row is set to black instead. In recent
versions Leif has made this a permanent, user-settable
feature. It's in the "First FFT" setup menu, the item
labeled "Main waterfall saturate limit". Try changing it
from 0 to 10, say. You can just edit the par_ssb file to
change this parameter.
Roger, W3SZ, described another possible approach.
Maybe you had something very different in mind?
-- 73, Joe, K1JT
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