[MRCA] AS-2259 antenna matching

[ersmar at comcast.net]

Breck:

     Thanks for the offer to assist a bit with this.  It would help if you could find the following dimensions for me:

1.  Inner diameter of the outer conductor on the mast;

2.  Outer diameter of the inner conductor of the mast;

3.  Any specs on the dielectric material in between these two conductors.  Otherwise I'll assume it's similar in composition to Andrew Heliax's dielectric;

4.  Feedpoint impedance at the base of the mast/antenna when erected, with no matching device in between the feedpoint and the measuring equipment.  You could use your portable PRC-47 mount and BNC connector as you suggested.

     For my study I need to know the actual impedance of the "transmission line" that the mast comprises.  Steps 1-3 or step 4 alone will provide that info.

     What I'm trying to do is develop just such a tuner as you're suggesting.  But because the impedances are so reactive in the Ham bands, I might not get it right the first time if I just throw a couple of caps and coils together.  

     BTW - What are the values of the components in your tuner?  

     Thanks for your help.   CU @ GIlbert.

73 de
Gene Smar  AD3F



     
 -------------- Original message ----------------------
From: "B. Smith" <smithab11 at comcast.net>
> Gene
> 
> I have a AS-2259. But why not just build a low loss variable network(aka 
> tuner) and tune for the "conjugate match", A variable network(tuner)would be 
> versatile  and would allow you to QSY across the bands.
> 
> I do not have the hubcap device.
> 
> I would be happy to make any physical measurements of the AS-2259 with a 
> micrometer, tape measure etc.  that you would like, I've always theorized 
> that the coaxial mast was a balun of sorts. I could  actually erect the 
> antenna on my "portable PRC-47 mount" and make some measurements at the base 
> of the antenna via the mounts BNC connector.   Perhaps we  could post the 
> info for all to use. You can see the mount on the " Field Exercise Page" of 
> the MRCA photos that I posted.
> http://solo11.abac.com/zorroab1/MRCA05/M2005photos/MVC-194F.JPG
> 
> 
> breck k4che 
> 
> 
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