[R-390] Antenna balun

[rbethman]

I can only speak for MY experience in regard to IT Surplus emporiums in 
MY area.

Consider that I am about a mile from a "Former" IBM manufacturing 
facility, that *USED* to use the THICKNET and Mainframes, there is NO 
Twinax to be found.

The last piece of this I saw was about six foot long.

I'll defer to YOUR finds, but it isn't happening here!

Bob - N0DGN

On 7/20/2011 1:52 PM, Tisha Hayes wrote:
> Finding the coax and connectors is pretty easy. It is the same stuff 
> that was used on IBM ThickNet connections in the bad 'ol mainframe 
> days. Looking for it as a radio supply will not yield any results or 
> will show folks who know that it can be used for the R-390/A and they 
> charge an arm and a leg for it. Surplus IT places will practically beg 
> you to take it away.
>
> Tisha
>
> On Wed, Jul 20, 2011 at 12:48 PM, rbethman <rbethman at comcast.net 
> <mailto:rbethman at comcast.net>> wrote:
>
>     The quality indeed looks VERY good, BUT then You'd have to buy one
>     for the antenna AND one for alignment.
>
>     It seems that the alignment for 50 Ohms, AND connect a 50 Ohm
>     feed-line is simpler and cheaper.  I certainly have NOT found ANY
>     of this twin-ax, and don't have a balanced feed-line, nor a dipole
>     that exhibits a 120 Ohm impedance.
>
>     Just my $0.02!
>
>     Bob - N0DGN
>
>
>     On 7/20/2011 1:21 PM, Tisha Hayes wrote:
>
>         Really interesting item. Looks like it is grade A build quality
>
>         330590619004
>
>
>
>
> -- 
> Ms. Tisha Hayes/ AA4HA
> -
> /"Learning is not virtue but the means to bring us an acquaintance 
> with it. Integrity without knowledge is weak and useless, and 
> knowledge without integrity is dangerous and dreadful. Let these be 
> your motives to action through life, the relief of the distressed, the 
> detection of frauds, the defeat of oppression, and diffusion of 
> happiness."  -- Nathanael Greene/
>

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