[R-390] R-390A /CV-157 /CV-591.
Gregory W. Moore
gwmoore at moorefelines.com
Thu Nov 3 10:52:52 EST 2005
Gentlemen:
As an "Ol Married Guy" of 36 years, I can only say "WOW". [Drooling
with envy]. Now, having 2 R392's and 2 URA-17's , and being threatened
with eviction by the XYL on a regular basis [that'Junk' in the
basement'] that pix of the rack with the R-390's, the CV-591, old
friends all, was truly moving.
73 de Greg "GW" Moore WA3IVX/NNN0BVN
john d kopke wrote:
> 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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Greg Moore NNN0BVN PA
U.S. Navy-Marine Corps Military Affiliate Radio System (MARS)
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