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> _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
