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Old 13th May 2021, 9:43 pm   #176
Matt kd4pbs
Tetrode
 
Join Date: Mar 2021
Location: Raleigh, North Carolina, USA.
Posts: 62
Default Re: Spectrum Analyser TR4172

David, I am thinking the same thing... Attenuator. Other pressing time wasters.. I mean... projects seem to have taken priority. I'll certainly report when I find the issue, but summer time is usually "anything but diddling with electronics bits at the workbench" time.
I, too have noticed an increase in sensitivity after re-tuning the RF section from the manual. I gained a few dB - enough that I actually don't need the amplification stage that I bodged in after the 1st mixer any longer. Still, I kept it in there and installed appropriate attenuators inline.
Lex, from what I can see of the 206MHz filter section, mine was nice and tight and solid.
This will be more interesting times spent fiddling after this summer for sure.
73, all-
-Matt
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