[R-390] AN/URM-25s

[chacuff]

Only the feared "Flux Capacitor"

Cecil
K5DL
-----------------------------------------

>
> I thought a faraday cage was where capacitors were kept.
>
> David / WB5UOM
>
>
>
> ----- Original Message ----- 
> From: "Roger Ruszkowski" <flowertime01 at wmconnect.com>
> To: <r-390 at mailman.qth.net>
> Sent: Friday, March 02, 2012 6:16 PM
> Subject: Re: [R-390] AN/URM-25s
>
>
>>
>> Barry,
>>
>> Its not so much that we worry about leaking on the bench.
>> It's when you go back to trying to receive with that radio.
>>
>>
>> At Ft Devens Mass about 50 miles from WBZ Boston, WBZ was every where on
>> the dial. To get WBZ every where it had to mix with some thing else in
>> some kind of mixer. We found all kinds of things that would mix two RF
>> signals OK WBZ and some other signal. I pick on WBZ but almost every 
>> other
>> AM station had a signal at more than on spot on the R390/A's with just a 
>> 3
>> foot test lead for an antenna in the class room. Radios all over that 
>> base
>> were radiating non stop as were generators and transmitters.
>>
>> I wish I had a radio room screened as well as the rooms I use to get to
>> work in. The stuff that invaded my receivers in San Diego and LA for 
>> years
>> made reception almost not worth turning the radio on. My site here in
>> Westminster South Carolina is a lot better but not like a good screened
>> room. Just adding a top and bottom cover does not fix most of the
>> problems. Also just parking the receiver in a metal cabinet does not do
>> much better. Maybe if I had the rack setting in several inches of water
>> (That expirment was conducted at  least once at Phu Bia during a typhon.)
>> I could get a good ground and better shield the receiver.
>>
>> Not that the screened rooms were all that great. We would have operators
>> come into the shop and ask us to to get our --- ---- off that frequency 
>> as
>> soon as we could because it was parked on some thing that was beating 
>> with
>> some thing else on the antenna and killing the dit of real interest. The
>> real problem was we did have signal generators in the box that leaked and
>> you could tune then to frequencies that would cause receiver 
>> interference.
>>
>> Roger AI4NI
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