Matching (was: Re: [Mobile-Portable] All onlistpleasestand..........)

[D C *Mac* Macdonald]

Addendum:

Actually, the feedpoint of your system  WOULD
be at RF ground, just not DC ground.

Mac - K2GKK/5



----Original Message Follows----
From: "D C *Mac* Macdonald" <k2gkk at hotmail.com>
Reply-To: Mobile-Portable Reflector <mobile-portable at mailman.qth.net>
To: mobile-portable at mailman.qth.net
Subject: Re: Matching (was: Re: [Mobile-Portable] All 
onlistpleasestand..........)
Date: Wed, 29 Nov 2006 21:36:06 -0600

Perhaps I wasn't clear.  The cap goes from the base
of the antenna to ground.  Basically, it forms an L
network with some of the antenna inductive loading
to gain the match.  Of course, this prevents having
a "GROUNDED" antenna.

73 & good luck,

Mac - K2GKK/5
Oklahoma City
Mobile since 1962



----Original Message Follows----
From: "Tom Bates" <tlbates at lr.net>
Reply-To: Mobile-Portable Reflector <mobile-portable at mailman.qth.net>
To: "Mobile-Portable Reflector" <mobile-portable at mailman.qth.net>
Subject: Re: Matching (was: Re: [Mobile-Portable] All on 
listpleasestand..........)
Date: Wed, 29 Nov 2006 19:25:38 -0500

 >>How about a lumped capacitance instead of
a coil?

Thanks, Mac.

I've considered a series capacitor, but decided against it for two reasons.  
One is
that I want to maintain a DC grounded antenna.  Two, once matched for lowest 
freq of
operation, the inductor needs no further adjustment when frequency changes.

I have a "T" type homebrew mobile tuner (pics if interested) that can match 
just
about anything-anywhere with several of my interchangeable upper antenna 
halves, but
50 or so kc QSY on lower bands, and I gotta stop- get out- and retune.

Oh yes... thanks for changing the topic.  After I pulled the trigger with my 
serious
questions, I was afraid some might just read the topic and click the "can 
it" button.

73,

Tom   AA1NZ


----
Your Moderator: Dick Flanagan K7VC, mobile-portable-owner at mailman.qth.net