[ForSale-Swap] Need info on Aftronics SuprSCAF filter

[Philip Atchley]

Hello.
Hope this isn't too far off topic.  Please reply off list to keep clutter
down.

My Aftronics SuperSCAF audio filter arrived.  This is a SCAF filter that
uses 4 thumbwheel switches to select the cutoff frequencies of both a Low
Pass and a High pass filter, thus creating a variable bandwidth filter.  It
appears to have possibly been a kit, though it is well built.

Anyway, all I received with it is a schematic of the unit (more than I often
receive).  After playing with the thumbwheels (BCD) for awhile I sort of
figured out how to set them up for a center frequency of about 700Hz (set
them at HP07 and LP06).

Preliminary tests showed that it's performance is 'similar' to that of the
Datong FL-3 when the latter is set up for about 700Hz and narrowest
bandwidth, though the Datong is still sharper.  No surprise, I found that by
cascading the two units I actually got much better filtering action without
ringing, especially as evidenced by removal of junk off to the side.  Not a
"huge" difference but enough to be noticable, and of course when working
near the noise floor levels or next to strong qrm every little bit helps.

MY QUESTION:  Does anyone have either the instructions OR the specification
sheet for this unit.  It was apparently marketed about 1988 (drawing is
dated Feb 1988).



73 de Phil, KO6BB

DX begins at the noise floor!
k06bb at elite.net
Merced, Central California
37.18N  120.29W  CM97sh