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

[rbethman]

  The "reality" is that I don't know of anyone with the appropriate 
twinax cable for a "true" balanced input.

All suggestions have been to "obtain" old IBM computer cables that were 
terminated with a balanced feed.

There isn't a large supply of the original twinax cable that was used 
"once upon a time".

So we end up with our "real" antennae and feedlines.

Hence the use of unbalanced coax and needing to match to the radio 
needs.  That is why pay a ridiculous price for a coax to twinax 
connector and have to end up grounding one side, or having it done in 
the adapter.

Bob - N0DGN

On 9/21/2010 3:01 PM, William A Kulze wrote:
> 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