Posted by
N2TK on
Mar 28, 2010; 9:51pm
URL: http://elecraft.85.s1.nabble.com/scopeing-filters-for-eventual-diversity-receive-tp4810767p4815033.html
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:
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[mailto:
[hidden email]] On Behalf Of Dave, G4AON
Sent: Sunday, March 28, 2010 11:10 AM
To:
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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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