[ARC5] ARC-5/274-N SAelectivity

[Hubert Miller]

Where was this published?
There is a Youtube video of a 'Command Set' upgrade where a crystal is added into one IF can in a clean, nonobtrusive, fixed setting crystal filter. This would have to have been the  6 – 9 as the crystals
are more readily found. I seem to recall this set's IF is around 2830 kHz and there was an old AM boat – band crystal for channel ( I think ) 2837 kHz which in FT-243 will fit into the IF can.  In the video,
the filter actually did give single – sideband, "single signal" selectivity. Cute. Of course, there is still a rather fast tuning rate to deal with, but it seemed from the video to be workable.
-Hue Miller



You all mention selectivity, or lack thereof.  Have any of you all tried the modification to the IF transformers?  I done virtually all mine (except, of course, the low freq. models) and a few more for others.  Bandwidth is reduced by about 50% with very little losses measured.  Sure makes things better on 80 and 40.
Jeep K3HVG
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