[Milsurplus] [ARC5] A Cable Question

[mac]

John,

I take it that RG-58/58A would look too skinny at 0.195"?  Looking  
through my cable charts the closest thing I see to 0.380"d would be  
RG-7 at 0.370"; 95 ohms and an old type probably very hard to find.  
Then there's RG-21A at 0.332"( but listed as a High Attenuation type),  
RG-42 at 0.342" (but gray and 79 0hms),  and RG-115 at 0.375" (but  
with a fiberglass jacket, not likely to be black).  RG-212 at 0.332"  
and 50 ohms wold fill the bill (double shielded type).  Don't see much  
after that.

Now, at the frequencies and with the very short cable lengths we seem  
to be talking about here the characteristic impedance of the line  
would not be important -- whatever Z appears at one of the cable will  
be reflected with negligible change to the other end.  I have some 75  
ohm cable I picked up in the U.K. years ago that is about 0.3125" OD  
and would be glad to donate 6 ft.or so with a PL-259 on one end.  The  
stuff does have a solid center conductor but the 93 should be able to  
accommodate this.

Dennis D.  W7QHO
Glendale, CA

*************
On Jul 27, 2011, at 4:54 PM, J. Forster wrote:

> OK, this is involved:
>
> 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
>
> ================
>
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