[ARC5] [Milsurplus] A Cable Question -- MORE

[J. Forster]

AHA!!

That is the answer, IMO.

13/32" is 0.406"

So Amphenol intended the connector body to be reamed out a bit!

Thanks very much.

Best,

-John

==================


> John, et-al,
>
> Checking the Amphenol advert in my 1943 Radio's master again, the
> description of the type 93 cable end connector says  "....for any co-
> axial cable up to 13/32" in dia." BUT, then goes on to say "May be
> reamed out to fit cables up to 9/16"."  I.e., cables up to  0.5265 "
> so the use of RG-8 (0.405") here may be riginally authentic!
>
> Dennis
>
> ************
>
> On Jul 27, 2011, at 8:49 PM, J. Forster wrote:
>
>> Hi Jim,
>>
>> The cable goes into the connector shell from the drawings I have. I'm
>> beginning to think the connector hole is undersized or the cable OD
>> changed when WW II started.
>>
>> Best,
>>
>> -John
>>
>> =============
>>
>>
>>> John
>>> I just checked TM11-487 dated 2 October 1944 for information on WW2
>>> coax.
>>> On
>>> page 492 is the data on RG-8 which is still listed as 0.405 inch O.D.
>>>
>>> Looking further, for the CASSF-50-1 you mentioned I found that it
>>> indeed
>>> cross
>>> references to RG-8/U and is called out in the column headed as
>>> "Replaces
>>> Old
>>> Cable Number".  Other numbers listed as replaced by RG-8/U are:  PT5,
>>> WC543,
>>> WC549.
>>>
>>> So I would assume that the jacket is butted up to connector but
>>> does not
>>> connect
>>> to it as is with modern constant impedance connectors.
>>> Regards,
>>> Jim
>>>
>>>
>>> ----- Original Message ----
>>> From: J. Forster <jfor at quikus.com>
>>> To: arc5 at mailman.qth.net; milsurplus at mailman.qth.net;
>>> Vintage-Military-RADAR at yahoogroups.com
>>> Sent: Wed, July 27, 2011 6:54:24 PM
>>> Subject: [Milsurplus] A Cable Question
>>>
>>> OK, this is involved:t.
>>>
>>> I'm working on a LORAN-A receiver for a Museum Ship and the antenna
>>> connector is an Amphenol Type 93. This is an early WW II aardvaark,
>>> used
>>> in only a few places AFAIK. Thanks to a generous list member, I now
>>> have
>>> the proper connector in hand.
>>>
>>> However, the connector will not take standard RG-8 or RG-214 cable.
>>> Their
>>> OD is to big.
>>>
>>> Assembly instructions from another list member calls out Navy Type
>>> CASSF-50-1 cable.
>>>
>>> Furthermore Google finds in "(1954) AN 16-30ARC5-2 Handbook
>>> Maintenance
>>> Instructions AN/ARC-5" that this cable is used to connect a VHF
>>> ARC-5 to
>>> the antanna and crosses it to RG-8/U.
>>>
>>> However, a check of current catalog of this cable specifies an OD
>>> of 0.405
>>> nominal, which will not fit.
>>>
>>> Apparently, the OD of RG-8 has changed over time. I think cable of OD
>>> <0.380" will work. The center conductor needs to be stranded.
>>>
>>> So, does anybody know where I can get a few (6?) feet of the stuff,
>>> even
>>> more preferably with an PL-259 on one end? I'd buy a roll of maybe
>>> 100' if
>>> there is a source.
>>>
>>> Thanks,
>>>
>>> -John
>>>
>>> ================
>>>