Michael Black wrote:
On Sun, 25 Aug 2013, Scott Dorsey wrote:

Did the R-388 have a phasing type crystal filter, or did Collins put a
mechanical filter in it? I seem to recall the former.

Yes, it had the crystal filter, which was useful in a CW pileup, but not
really all that great for AM or SSB.

I traded _that_ up for an R-390A which has mechanical filters with very
sharp skirts combined with a narrowband audio filter for picking one CW
signal out. Audio quality for phone is not very good, but you can hear
stuff way down in the grass.
--scott

--
"C'est un Nagra. C'est suisse, et tres, tres precis."