[Elecraft] scopeing filters for eventual diversity receive.

[N2TK, Tony]

Dave,
Tnx for the tip. In one K3 the 400 stayed at 0, and the 200 went from -.89
to -.84. In the other K3 the 500 went from -.75 to -.88 and the 200 went
from -.94 to -.96. 

73,
N2TK, Tony
#311
#1435

-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Dave, G4AON
Sent: Sunday, March 28, 2010 11:10 AM
To: elecraft at mailman.qth.net
Subject: Re: [Elecraft] scopeing filters for eventual diversity receive.

Inject a clean signal to the K3, around S5 - S7 in level, go into the 
CONFIG menu, adjust the filter offset (FLx FRQ) by rotating the main 
tuning knob until the signal drops one S point then adjust it to the 
other side until it again drops one S point. Set the offset to the 
middle of the two extremes.

My 400 Hz 8 pole filter appeared to have more insertion loss than my 250 
Hz 8 pole, setting the offset solved the apparent additional insertion 
loss. My settings are -0.07 for the 400 Hz and -0.05 for the 250 Hz.

73 Dave, G4AON
K3/100 #80
-----------------------

How are you testing for offset? Sounds like I should check the offset on my
5 and 8 pole filters.

73,
N2TK, Tony
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