[R-390] AN/URM-25s

[Curt]

Hi Bob:

Yes..I don't think your observations are unique.  As Trish noted, it 
takes a lot of effort to really seal up something at that RF level.  I'm 
sure the braid seals will help.

Former life as a Tektronix field engineer, I had the opportunity to 
support several well equipped Rx development labs in the area.  The 
efforts they took to get isolation were pretty remarkable.  Screen 
rooms, floating floors, anechoic coatings, etc.  Hard to imagine anyone 
doing similar work without extraordinary measures.


On 3/1/2012 3:21 PM, rbethman wrote:
> This may be so.
>
> I will only explain that with my AN/URM-25D on, not connected, and about
> 3feet away from a closed Kenwood R-2000 with nothing connected to the
> SO-239, and NO cable on the AN/URM-25D, I was able to pick up carrier
> and S-Meter deflection.  This was with the output dialed to the minimum
> on the Sig Gen.
>
> So the leakage is real.  Both were on separate circuits, and both had a
> separate ground.
>
> Hence my commentary and my intent.
>
> If I want to begin "sniffing", I have an HP-312A Frequency Selective
> Voltmeter.
>
> However, based on the described above observation, I'm going with the
> extra RF seal!
>
> Bob - N0DGN
>
> On 3/1/2012 3:12 PM, Curt wrote:
>> In the Army cal manual for the TM 1170 (Wavetek 3002) there is described
>> a "test wand" used to validate the leakage level.  The attenuator goes
>> down to -138dBm.
>>
>> Curt
>>
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