[R-390] 60 Hz Hum Output from R-390A IF Module

[Jon Schlegel]

Hi Bob,

Actually I using an HP8640B generator and I'm 
able to look at it's output spectrum close enough 
to see that it's output is pretty clean with 
respect to 60 Hz.  To be absolutely certain I 
went through the same exercise with a 2nd 8640 
and it was also clean.  It's looking as though 
any possible generator problems that may exist 
are at least not adding to the hum.


At 01:47 PM 5/9/2009 -0400, you wrote:
>Jon,
>
>URM-25
>
>Section 6 of the NAVSHIPS manual - Corrective action.
>
>Hum on output - Tighten T-201, replace V-101.
>
>You DID say no RF no hum?
>
>I've just been re-reading and also digging into the URM-25 manual.
>
>Bob - N0DGN
>
>--
>Bob - NØDGN
>