I once used the MFJ audio filter at the low level audio i/o
jack in my 509, it worked OK but took a little attenuation to
get it just right.
I want to mention the possibility of sticking in the extra
IF filter in the IF line. It looks quite simple, and I am
about to do it on my 515. First, I plan to stick in a simple
extra 8 pole SSB fitler in the line. Once that is working OK,
I plan to add a switch, maybe put it all in an outboard box,
and add a 500 Hz filter to it. Then let the QRM try to intrude.
The IF filter mods have appeared in several publications for
the Argonaut 509 and 515. The last one I saw was QQ April '87.
I heartily recommend the Ten Tec add on filter also, got one
myself and it is well done.
Clark
WA3JPG
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