[Elecraft] K2 MDS measurement values with XG1

Lambs, Dick & Judy rlamb at slamb.org
Fri Oct 21 09:43:18 EDT 2005


Here's a question for someone who has determined their K2 MDS  
(minimum discernable signal) with the XG1.  What were your raw audio  
voltage measurements, S+N and N, across the speaker?

The XG1 manual (p 5) says a K2 should produce a S+N of roughly .4 to . 
8 Vrms audio.  But I'm not completely sure this refers to the 1  
microvolt MDS test, as my K2 falls far short of this even though it  
seems to work OK.

With 1 microvolt in and everything set up as described in the XG1  
manual for the test, my K2 produces about 0.125 Vrms, as measured on  
my Fluke Model 8000A, and about 0.0025 Vrms with the XG1 off.  This  
works out to -141 dBm MDS, which is on target.  However, I'd call my  
audio output just adequate in some circumstances.     Before I start  
trouble shooting I'd like to be sure I've really got a problem.

Thanks
Dick, K0KK





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