[Mobile-Portable] Webster Bandspanner Info

[D C *Mac* Macdonald]

If I remember correctly, good matching was obtained
by using a 1000 pFd mica or 470 pFd mica cap shunted
from the base of the antenna to ground.  1000 pFd for
75m and 470 pFd for 40m.  Use progressively lower for
the higher bands.
 
It was pretty much the same for the Master Mobile
Hi-Q single-band coils with a 3' base section and
5' top whip (which I used in 62-72).
 
I went to the adjustable Master Mobile Matcher to
resonate the antenna up and down in frequency and
the adjustable Master Mobile Micro-Z matching network
to match the antenna to 50 Ohm impedance.
 
73 - Mac, K2GKK/5
(Since 30 Nov 53)
Oklahoma City, OK
 
p.s.  That antenna system still resides in my garage.
It worked a whole lot better than Webster Bandspanners
or the Slim Jims, especially on 75 and 40 meters.
 
 

----------------------------------------
> From: k4bg at planters.net
> To: mobile-portable at mailman.qth.net
> Date: Wed, 3 Mar 2010 16:35:03 -0500
> Subject: Re: [Mobile-Portable] Webster Bandspanner Info
>
> Tom....I hope someone can help. I also have an "original" 50's long model
> color brown in great shape and used it until recently but sold the pickup
> and mobile xcvr. I too would love to get any sort of paperwork to go with
> the antenna. It works great in my opinion. I constructed a capacitor match
> at the base using plug-in 1/4" phone plugs for 80 and 40 meters with the
> caps inside the plug shells. Us old timers remember them well.....73,
> Bob K4BG
>
> --------------------------------------------------
> From: "Tom Bates" 
> Sent: Wednesday, March 03, 2010 06:55
> To: 
> Subject: [Mobile-Portable] Webster Bandspanner Info
>
>> Greetings...
>>
>> Anyone on the list have a copy of "Mobile Antennas ... Simple steps to
>> peak performance" by Webster Manufacturing? I have a pdf of the
>> original
>> instructions that came with the bandspanner, and that pub mentions the
>> other
>> one that I'm looking for.
>>
>> Help??? Thank You,
>>
>> Tom - AA1NZ
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