[R-390] R-390A /CV-157 /CV-591.

john d kopke jdkopke at cablespeed.com
Thu Nov 3 09:07:10 EST 2005 

Dear Sir;
With all due respect.
Many of us will live out our lives longing for the equipment that
you have in you're garage rack'.
When I was a single parent, I once put my spotless Triumph
Hurricane in my living room, the comments, from female visitors were 
priceless, I wish that I could have recorded them.
My commentary to their objections, was "you're right, Ill'
move it to the bedroom".
It would be an honor to help you move this beautiful equipment
, to your den , or bedroom, please advise me when you will be ready.
Sincerely;
john kopke

----- Original Message ----- 
From: "Fernando Quinones N2FQ" <n2fq at sbcglobal.net>
To: <r-390 at mailman.qth.net>
Sent: Wednesday, November 02, 2005 9:30 PM
Subject: Re: [R-390] R-390A /CV-157 /CV-591.


> Hello
>
> I've been lingering in the background and wanted to say thanks for  this 
> tidbit.
> I have just installed my 390A in a 6ft rack and according to your 
> comments,
> I can see why I had difficulty in lining up the holes.
>
> Now I'm enlighten and thanks.
> Notice that I have some space between them that are not uniform but  gets 
> them off the floor.
>
> <http://pages.sbcglobal.net/n2fq/_images/r390arack.jpg>
>
> take care
>
> On Nov 2, 2005, at 5:06 PM, Flowertime01 at wmconnect.com wrote:
>
>> John,
>>
>> You ask if anyone here suggest a way to find a CV-157 , or a CV-591 
>> cabinet.
>>
>> The R390 and R390A mostly did not come in a table top cabinet like  the 
>> ones
>> you refer to. Mostly we were mounting them two or more in upright  racks 
>> or side
>> by side in a sloped front double wide cabinet.
>>
>> The receiver has a standard 10 1/2 inch 6U high front panel. A "U"  being 
>> 1
>> 3/4 inches. I have no idea who standardized the U at 1.75 inches.  and 
>> decided
>> things should be in multiples of that unit.
>>
>> Blank panels come in 1.75 high increments. And they are all 19"  wide. 
>> 24" is
>> also another standard width.
>>
>> Finding a table top cabinet that is deep enough can be a problem.
>>
>> HP put some signal generators in some standard cabinets with RETMA 
>> mountings.
>> RETMA being the standard hole pattern that goes with the U panel 
>> heights.
>>
>> Once you under stand there is a method and pattern behind the  madness 
>> you see
>> the logic in the hole patterns along the sides of most military and 
>> heavy
>> duty test equipment. Lots of it comes out of the little cabinets  and get 
>> mounted
>> in big racks in the shops and labs where it lives forever.
>>
>> You can find short "table top" cabinets around. Watch your local  swap 
>> meets.
>> If you live near a big military contractor, watch for their surplus 
>> sales.
>> These guy will some time put stuff out for sale. Hughes use to do 
>> employee
>> preference sales on the first Saturday of the month in Fullerton 
>> California. Boeing
>> did sales in Washington. Rockwell did sales in Los Angles.
>>
>> Any way there are commercial cabinets available as used equipment.  If 
>> you
>> find one a bit more than 6 U high, you can put the receiver in it  and 
>> fill in the
>> extra space with a blank panel of 1, 2, 3 or more U high.
>>
>> Cabinets are listed new in catalogs but the price exceeds the price  you 
>> pay
>> for the radio. Shop around until you hit the $40.00 range for a  good 
>> looking
>> used short rack.
>> Full "6 - 8 foot cabinets closed on sides with a back door can be  had 
>> for $80
>> - $100 dollars. You can also find short 4 foot floor racks. some on 
>> casters.
>> Lots of these were old computer cabinets and are floating around.
>>
>> The rail pattern is a standard pattern in all these cabinets. Any  of 
>> them
>> with a rail set 19" wide will work. Some have threaded rails for 10  x 32 
>> bolts.
>> some have holes and use a tinner nut (cheep "yea cheep" not the  cheap) 
>> nuts or
>> a good nut with a retainer clip that go with the rails. There are  also 
>> "nut
>> bars" which are strips of metal with 2 or 4 tapped holes that fit  the 
>> RETMA rail
>> pattern. Any of this hardware will work.
>>
>> Try not to hang your R390 by the front panel. The receiver weight  is to 
>> much
>> for the front panel to support. The panel bends and will not look  so 
>> good.
>> Just because you can do it does not imply you should do it. The  cabinet 
>> should
>> have some blocks put in the bottom to support the receiver. Some  table 
>> top
>> cabinets will have internal rails to support the receiver. Floor  racks 
>> typically
>> have a set of rail holes inside to mount rails on that support  stuff 
>> bolted to
>> the front panel. These side holes and rails are also a standard  type 
>> item. The
>> rails are usually a 2 inch by 2 inch chunk of angle iron. In floor  racks 
>> the
>> back rail set is adjustable to fit slides and mounting rails. For  being 
>> a
>> standard item the stuff I have seen inside floor cabinet has ranged  all 
>> over the
>> spectrum. But it will all bolt up a lot like an erector set.
>>
>> I hope this opens up your search window and you find a nice cabinet  for 
>> your
>> receiver.
>>
>> You would like to have your receiver in a cabinet. If you wind up  with a
>> floor cabinet someday, remember you want to keep it enclosed and 
>> grounded. The
>> whole idea of using a steel cabinet with an R390 on a table top is  to 
>> shield it.
>> Shield also implies ground. The R390's (and A's) will pick up a lot  of 
>> local
>> signal that mixes to noise in the audio output. Placing your  receiver in 
>> a
>> cabinet helps. Consider that at 30 Mhz a 1/4 wave is still several  feet 
>> long. So
>> small slots are still effective shields. If the AM band 1/4 wave is  very 
>> long,
>> an open cabinet side is not a shield. There is some rational  between 
>> slots and
>> screens being OK in shields and real big openings being not so good.
>>
>> Roger KC6TRU
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>
> Fernando  N2FQ
> <http://pages.sbcglobal.net/n2fq>
>
>
>
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