I believe that all this does is prove what I have said many times for over two years---every K3 is different with respect to its RFG/AGC characteristics.
The RF Gain "calibration" is an attempt to fix this variability. --- On Thu, 7/21/11, Edward R. Cole <[email protected]> wrote: From: Edward R. Cole <[email protected]> Subject: Re: [Elecraft] RF gain sweet spot To: [email protected] Date: Thursday, July 21, 2011, 11:13 AM K7WIA's experience with his 6m receiver got me to try this with my K3. I have an ARR P50VDG preamp installed and see typically S4 flickering up to S5 for noise connected either 6m yagi. Reducing RFGain immediately increases s-meter reading with the ARR preamp so I switched it off. Noise is almost not readable on the s-meter and reducing RFGain does not result in increase in s-meter reading until I rotate the RFGain less than 3-oclock postion. There is not enough s-meter resolution to tell if there is any reduction in noise (none detectable by ear until s-meter begins to rise). Finally, I tried this with the internal K3 preamp turned on. Normal noise reading is S3. Reducing RFGain exhibited the same as not using any preamp except s-meter stays at S-3 until I rotate below 3-oclock position whereby the reading climbs above S3. Considering that I am in rural Alaska I should have less ambient noise floor than K7WIA but do not see the behavior he is seeing. Comments? I would be interested to know if he is using a K3 (radio was not specified) and whether that was running with a preamp and what kind? My take on my readings is that the ARR has more than enough gain (maybe too much) and I am seeing amplified noise. But I do not get the s-meter behavior seen by K7WIA when reducing RFGain? 73, Ed - KL7UW, WD2XSH/45 ====================================== BP40IQ 500 KHz - 10-GHz www.kl7uw.com EME: 50-1.1kw?, 144-1.4kw, 432-100w, 1296-60w, 3400-? DUBUS Magazine USA Rep [email protected] ====================================== ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] 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:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
