[R-390] antennas

[John Kolb]

The connectors have a groove around the outside of the outside 
conductor, right?

The mating male connector is a bit larger than a type "N", and is 
held in position
on the chassis mount female by three ball detents. You pull back on the outer
ring of the male connector allowing the balls to pop out of the ring 
on the female.
Patch cords with these can be switched rapidly, and handle more power than a
BNC, although I never saw them used on transmitters.

John


At 04:40 AM 10/18/2007, Bob Camp wrote:
>Hi
>
>The band splitter sounds a lot like the SRA-12 I have sitting here.
>It's got some strange connectors on it. They certainly don't match
>anything on the back of an R-390.
>
>Bob
>
>
>On Oct 18, 2007, at 12:19 AM, John Kolb wrote:
>
>>
>>On the 390's we used on the Navy ships I was on, there was a
>>connector (right angle) which took the two pins of the balanced
>>input, shorted one side to gnd, and the other side to the center
>>pin of a "C" connector, where most often, it was connected to
>>a 35 foot vertical whip, fed either direct or through an antenna
>>splitter.
>>
>>Don't know the splitter name - it divided the signal into bands,
>>2-4, 4-8, 8-16, 16-30, or something similiar, and had about
>>4 outputs for each freq range.
>>
>>John
>>
>>At 06:31 AM 10/17/2007, Rasputin Novgorod wrote:
>>>Hi Guys:
>>>
>>>My random wire connects via a 9:1 un-balun to 50 ohm coax.
>>>The shield is grounded. Because I had the correct adaptor,
>>>I connected the coax to "Unbalanced" antenna connector on
>>>the R-390A. It works well.
>>>
>>>But as I skim the schematics, it appears that the unbalanced
>>>antenna connector goes to the secondary side of the input
>>>preselector(?) CL filters. Does that mean I miss out in the
>>>first layer of filtering?
>>>
>>>The "Balanced" connection goes to the Primary side the
>>>"preselector". Would I be better off connecting there?
>>>I know some people connect an unbalanced antenna to the left
>>>pin of the "balanced" connector and ground the right pin.
>>>
>>>In the good old days, how would the military connect the
>>>Balanced connector to a dipole? Would they have some
>>>sort of 125 ohm dual conductor coax? Surely not
>>>ladderline.
>>>
>>>Perhaps instead of answering my questions, someone can tell
>>>me what I need to know...
>>>
>>>Sincerely,
>>>/blair
>>>
>>>
>>>
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