I thought I would pass on the results of my testing the absolute S-meter mode using the XG2 signal generator as reference source. I am using beta FW 01.96/00.02/0.173
The VFO-B help menu for Smtr scale says that the S-meter is calibrated with preamp on, and AGC on. It looks from my data that my unit S#508 the calibration is consistent with pre amp off, not on. Was there a change? Test results using default S-meter parameter settings and AGC on are below. Filter used for this test is the stock 2.7 KHz 5 pole. Test was done on 40M, F = 7.040 MHz with receiver zero beat to tone (using 50 Hz bandwidth to zero beat). I notice that with 500 Hz filter and 6 Khz filter settings that all measurements below move down an S, see note below. Smtr mode = Nor Pre Amp off, ATT off 50-uV = S-9 1-uV = S-3 Smtr mode = Nor Pre Amp on, ATT off 50-uV = S-9 + 10 dB 1-uV = S-5 Smtr mode = Nor Pre Amp on ATT on 50-uV = S-9 1-uV = S-3 Smtr mode = Abs Independent of ATT or Preamp settings 50-uV = S-9 1-uV = S-3 I like the absolute mode and will leave it there. Since running this test I have adjusted filter gains of the 6 KHz and 500 Hz filters up by 3dB to equalize the S meter readings (and audio) independent of filter settings. Mike Scott - AE6WA Tarzana, CA (DM04 / near LA) K3-100 #508/ KX1 #1311 _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
