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[Linrad] system gain
- Subject: [Linrad] system gain
- From: Dave Sublette <arrl.net; k4to@xxxxxxxxxxxxxxxx>
- Date: Wed, 08 Apr 2009 10:11:50 -0400
I have been watching the email thread on setting optimum gain and other
settings for the LINRAD program. I have used the program, rather
casually, for two years or so to look at weak signals on the 144 mhz IF
outputs from my microwave transverters. I put a gain stage ahead of my
SDR-14's direct input and that stage measures at 0.9 dB nf and 18 dB
gain or so at 144 mhz.
When I remove this amplifier from the system, the noise floor on the
main spectrum display on LINRAD drops 8 dB. I read in the emails that it
should drop 15 dB, if I understand things correctly. I am looking at
about a 160-170 Khz slice of the spectrum around 144.1 Mhz,
I do note that the visual display on Linrad is not as sensitive as my
receiver on a splitter from the same IF.
My question is, "Where should I look next to either find the problem or
adjust the LINRAD parameters to bring the LINRAD system sensitivity up
I continue to read the web page and previous emails from VK2DU on setup.
Nothing I have tried seems to be working. I would list all my settings
here, but perhaps that would be premature.
Any advice to be had out there?
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