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

[J. Forster]

Hi Mike,

I have a lathe but camnnot access it. I'm going to try some sandpaper
wrapped around a pen. There is max of about 0.025" to increase the ID.

I never thaought about the cable either.

On a ship, they would have just gone to the shop or used a tapered reamer,
I guess.

Thanks,

-John

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



> Reaming is certainly a possibility if you happen to have a set of
> reamers on the tool shelf.  You may be surprised at the cost of a single
> reamer - $30 is about average.  Reamers are normally used for finishing
> holes to extremely exact tolerances, certainly not the requirement
> here.  The coax varies by several thousandths, so you would want the
> diameter of the hole to be a couple of thou above the .405 nominal for
> RG-8.  The easiest way is to chuck the connector in a lathe and simply
> bore it - about 5 minutes max.   Drilling is possible, but you will have
> to have a very rigid setup with no free play in the feed to avoid a two
> flute drill catching in the brass and damaging the thin wall material.
> For only .025" removal, you could also grind it out with a Dremel using
> a continuous circular motion, but the brass will fill the pores in the
> grinding wheel *very* quickly and have to be cleaned off several times
> in the process.  Wish I had known - I coulda bored it out for you before
> I mailed the connector.  I didn't even think about the cable at the
> time...:'(
>
> 73,
> Mike
>
> On 7/28/2011 9:36 AM, J. Forster wrote:
>> 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
>>>>>
>>>>> ================
>>>>>
>>
>> ______________________________________________________________
>> Milsurplus mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/milsurplus
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:Milsurplus at mailman.qth.net
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>>
>>
>
>