[Elecraft] K3 AGC and IF Output Data

[Jack Smith]

My K3 arrived Wednesday (SN 1378, assembled with 100W and 2nd receiver 
option, ordered in late May 2007 and held until the 2nd  receiver was 
available, for those who keep track of such things.)

I've had a chance to look at a couple of items and have written two new 
web pages with the results of my measurements.

First is what do the AGC SLP and AGC THD settings actually correspond 
to? Using an automated data collection system, I've looked at the K3's 
audio output for RF levels between -140 and -20 dBm with varous AGC THD 
and AGC SLP settings. I also looked at the S-meter calibration over a 
similar range while I was at it.  
http://www.cliftonlaboratories.com/elecraft_k3_agc_and_s-meter.htm

Second, I went through the IF sample port signal level  measurements, 
including transfer gain (around -17.7 dB) and 8215 KHz isolation (68 dB 
or thereabouts) as well as signals out of the IF sample port other than 
the desired IF frequencies. I also looked at performance of a Softrock 
6.2 Lite and my Z90 when connected to the K3 with and without an 
auxiliary buffer amplifier. There's also an important note for Z90 
owners planning on using their Z90 (or Z91) with a K3. 
http://www.cliftonlaboratories.com/elecraft_k3_and_panadapters.htm

Jack K8ZOA
www.cliftonlaboratories.com


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