[R-390] The Saga Pt 6 (Antenna Balun

[William A Kulze]

I think the idea is for performance with an antenna. However you do the alignment, the sig gen config is just to let you do the adjustment, and I guess that's handy for getting sensitivity numbers, but how's it work with an antenna? A balanced line from the antenna to the balanced antenna input, and the impression I get is that this adjustment comes into play with a balanced feed. Most of the time I'm using my radio with an antenna and not a sig gen.

Bill W2NVD

-----Original Message-----
From: r-390-bounces at mailman.qth.net [mailto:r-390-bounces at mailman.qth.net] On Behalf Of rbethman
Sent: Tuesday, September 21, 2010 12:01 PM
To: r-390 at mailman.qth.net
Subject: Re: [R-390] The Saga Pt 6 (Antenna Balun

  Bernie - I don't know what "improvement" will be seen.  It begins to 
get into what specific Signal Generator is used, how its impedance is 
effected, and other things.

Roger R. will tell you that they spent their career(s) using 
AN/URM-25(X) sig gens.  By their nature, they were issued with a 50 ohm 
Z "phantom/dummy" antenna.

Nothing wrong with Tisha's method!

Bob - N0DGN

On 9/21/2010 11:49 AM, Bernie Doran wrote:
>
>> "Has anybody tried a balun of the proper ratio to couple the coax to the
>> balanced input?"
>>
>> Yes, I have, that is the way to go. I hand wound a 2.5:1 un-bal, put it in
>> a
>> metal box with a coax connector on one end and a twinax pigtail on the
>> other. It works just great.
>>
>> If I recall correctly, using the C connector there is a mini coax flipover
>> you need to do at the RF deck to get the best sensitivity.
>>
>>
>> -- 
>> Ms. Tisha Hayes/ AA4HA