[R-390] Balanced Antenna Input Question - WARNING

[Jon Schlegel]

Hi folks,

Regarding  use of a balun or similar 
arragement.  I snagged a couple of Twinax 
connectors (Amphenol 203/743-9272) on ePay.  This 
connector mates to the Twinax connector on the 
receiver and accepts Twinax cable on the order of 
0.35 inches diameter.  At first glance it looks 
like a type N connector.  A nut tightens the 
rubber cable clamp as you'd expect on any connector of this general style.

My plan is to mount the connector to a small box 
with the its clamp nut and put a balun in the box 
and an unbalanced connector to feed it.  The 
result is a balun with contiguous shielding all 
the way through to its unbalanced input that doesn't "defile" the R-390.

Jon WA3MVM




At 05:37 PM 12/8/2008 -0500, rbethman wrote:
>Dick,
>
>I read this again, and see that you are going to REMOVE the antenna relay.
>
>This REMOVES the break-in/Mute Function!!!!
>
>If you plan to use this with a separate 
>transmitter, YOU must provide for this in some manner!
>
>Bob - N0DGN
>
>Richard W. Solomon wrote:
>>Rather than just grounding one side of the balanced input as would
>>happen when you use a UG-970-xxx adapter, how about using a small
>>wide-band balun ? One could mount it in a small box in place of the
>>antenna relay. Not on keeping with the idea of restoration, but maybe
>>the operation would be improved ?
>>
>>Comments, thoughts, doubts ??
>>
>>Thanks, Dick, W1KSZ
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>
>--
>Bob - NØDGN
>
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