[R-390] antennas

[Bob Camp]

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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