[R-390] Re: [Milsurplus] Transplanting R-390 IF modules to R-390A

[Tim Shoppa]

Mikea wrote:
> On Fri, Feb 02, 2007 at 12:18:11PM -0500, Mark Huss wrote:
>> That they 
>> also decoupled just about every line out of the PTO and
>> into the IF Deck  with ferrite beads probably did not hurt either.

> Phase noise problems with the PTO? As in just junk
> on the PTO output line, fixable by ferriting it, or other
> problems that required changes to the PTO other than
> just ferrites?

Noise on an output that is fixable by "ferriting it" is not
usually called "phase noise". Usually phase noise in a MW
radio context refers to "close-in phase noise".

Ferrites are usually used to reduce EMI susceptability
and/or EMI emissions at a frequencies far away from
the desired frequency.

Several of a 390A's oscillators exhibit FM under B+
and AGC variations. But again that's usually called
FM and not "phase noise".

I hesitate to send this e-mail to the list at all because
I just make matters worse by mentioning actual problems
in an attempt to get someone to define their mythical
problem.

Tim.