Hi Joe, That is expanding my understanding of the RF gain term as before I have had experience with old Yaesu transceivers like FT990 FT1000 and there RF gain makes effect similar to attenuator's one, pushing the sensitivity down.
I will share your experience on the Kenwood TS2000 in Russian JT65 forum: there are several users of the Kenwood transceivers who are suffered with AGC operation. Thanks a lot, 73 Igor UA3DJY >------------------------------ > >Message: 3 >Date: Thu, 12 Nov 2015 12:49:56 -0500 >From: Joe Taylor < j...@princeton.edu > >Subject: Re: [wsjt-devel] high sensitivity of decoder vs TRX AGC >handling >To: WSJT software development < wsjt-devel@lists.sourceforge.net > >Message-ID: < 5644d144.6090...@princeton.edu > >Content-Type: text/plain; charset=UTF-8; format=flowed > >Hi Igor, > >> What makes me worry is that when RF gain is used (some people >> do use attenuator) to get to more linear band of the AGC >> operation, it supresses receiver sensitivity putting very >> weak signals out of scope of the decoder. > >Of course one does not want to reduce sensitivity to weak signals. The >original motivation for all of the WSJT modes is to provide optimum >weak-signal performance for a variety of propagation modes (such as EME, >meteor scatter, etc.). In EME, every 0.1 dB is important. I know that >reducing the RF gain setting on my TS-2000 has not compromised my >sensitivity. Knowledgeable users will make suitable tests to be sure >this is true for their systems, as well. > >What is NOT desirable is to allow one or more strong but fading signals >to cause your Rx system gain to fluctuate by large amounts during an Rx >period. Such effects will surely reduce your sensitivity to weaker JT9 >or JT65 signals. > >-- 73, Joe, K1JT > >devel Digest, Vol 21, Issue 28 >******************************************
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