[R-390] R-390 sensitivity measurements

[David Wise]

It's well-known that the strong points of the
manual's procedure for setting IF gain are ease
and uniformity, not optimal S/N.  The preferred
gain is somewhat lower, and several people have
discussed this.  I think there's a technical report
on Chuck Rippel's web page, for example, but there's
no standard that I know of.  The goal is weak-signal
copy, but I don't know what kind of test signal
serves that best.

73,
Dave Wise

> From: Dave Maples [mailto:dsmaples at comcast.net]
> 
> All: While we are talking about sensitivity, I have wondered 
> for a bit if
> doing a SINAD measurement on an R-390A in the 16 kHz or so 
> setting would be
> of value in setting the sensitivity pot.  The idea here is 
> that we would be
> looking at a known modulation (1000 Hz) against composite noise.