On my FTDX-5000MP I never had the preamp on for anything below 40m all it did was increase noise. All that was ever done was to use the DNR to bring the signal up out of the noise floor a lot of the time for a signal only saw on a spot you had to bring it find it with the DNR on that frequency. As I have said this is a point that the 5000 does better than my K3's about the only one though.
-----Original Message----- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of k...@charter.net Sent: Tuesday, November 13, 2012 8:39 AM To: elecraft@mailman.qth.net Subject: [Elecraft] K3 sensitivity below 40 meters Conventional wisdom historically has been that a receiver preamp is not used at 40 meters and below primarily because it is not needed, indeed it would typically degrade receiver performance. So why is it necessary to engage the 20 dB preamp on the K3 to get it to hear an S9 signal at the appropriate level of other receivers? ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
