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

[rbethman]

modulation is adjustable on mine up to 50%.

If you need something other than 400cps or 1Kc, input a tone generator 
into the AN/URM-25

David Wise wrote:
> Modulation, not output. 
>
> -----Original Message-----
> From: rbethman [mailto:rbethman at comcast.net] 
> Sent: Friday, May 08, 2009 5:35 PM
> To: David Wise; r-390 at mailman.qth.net
> Subject: Re: [R-390] 60 Hz Hum Output from R-390A IF Module
>
> AN/URM-25s are NOT fixed ouput levels.  They can be dialed down to WELL 
> under 1 uVolt.
>
> These are what the R-39X series were worked over with.
>
> I still use one today.  I've gotten my R-2000 to tweak in at the ZERO 
> reading.
>
> Bob
>
> David Wise wrote:
>   
>> What percentage modulation?
>>
>> (Pardon me if the URM-25 is fixed-level, I'm not
>> familiar with it.)
>>
>> Dave 
>>     
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-- 
Bob - NØDGN