I checked mine, and also got zero attenuation. Then, I remembered to turn
off the AGC. Results were much more believable, but still decent. My filters
had much steeper skirts, tho, if memory serves (it usually doesn't). BTW,
I'm running 2456's supplied crystals, and haven't looked at the toroids
since they were installed.
Let me check "sent items", I know I said something last year.
...
Found it!
Do overs!
What I really proved is that the AGC circuit works really well<g>.
Nobody spotted the error in my Setup, I.E., AGC OFF not specified.
I just reran the test with AGC off. Results are still excellent, but not as
perfect as I reported yesterday.
Bandwidth
Setting Peak
0.00 -41
0.10 -35
0.20 -34
0.30 -31
0.40 -30
0.50 -29
0.60 -29
0.70 -29
0.80 -30
0.90 -31
1.00 -30
1.25 -32
1.50 -32
1.75 -33
2.00 -34
2.25 -32
2.49 -33
OP1 -36
My perception of "No Attenuation" comes from my standard practice of cycling
between 0.90, 0.50 and 0.20 (-31, -29 and -34 respectively) plus the AGC
working made me think it was flatter than it is. However, 5db isn't too bad
if the S9+ interfering signal disappears.
Dan / WG4S / K2 #2456
<snip>
It looks fine, although I would move the two wider filters a bit to the
right.
There looks like about 6-8 db difference in attenuation between the widest
and
narrowest filters, which is probably on the high side of normal (although
this
tends to vary).
</snip>
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