[TowerTalk] TA-33 Classic Feed Model TAC-33K

[Bill]

Bill
It is a very clever arangement which is consistent with my last post.  I 
think I would prefer to use a 1:1 balun for the feedpoint, however, rather 
than what is essentialy a common mode filter made of a couple of turns of 
coax.

74
Bill
W7VP


----- Original Message ----- 
From: "Bill Gode, Sr." <w9nhq at comcast.net>
To: <towertalk at contesting.com>
Sent: Tuesday, August 15, 2006 7:18 AM
Subject: Re: [TowerTalk] TA-33 Classic Feed Model TAC-33K


> It's called "Balanced Capacitive Matching" and is described on Mosley's
> web site.  Scroll down the following page and look for the Classic Feed
> System:
>
> http://www.mosley-electronics.com/page%20files/faq.htm
>
>
> 73,
>
> Bill - W9NHQ
>
>
> ----- Original Message ----- 
> From: "Bill" <w7vp at comcast.net>
> To: "Peter Voelpel" <df3kv at t-online.de>; "'Towertalk'"
> <towertalk at contesting.com>
> Sent: Tuesday, August 15, 2006 9:06 AM
> Subject: Re: [TowerTalk] TA-33 Classic Feed Model TAC-33K
>
>
>> Well it is not a T-match, Pete.  A T-match does not have a split
>> driven
>> element and th ends are indeed attached tot he driven element.
>> Doesn't
>> sound like a Beta match either since there is no direct coupling to
>> the
>> elements using inductance to match the feedpoint reactance.  Sounds
>> more
>> like a means of reactively coupling to the the elements with primarliy
>> capacitive coupling since the coax center conductor is inside the
>> driven
>> element.  The design of the coupling would naturally take into account
>> the
>> feedpoint impedance R-jX (or in this case perhaps R+jX) in a fashion
>> that
>> the R is the characteristic impedance of the coax and the jX is the
>> required
>> matchin reactance.  Neat idea.
>>
>> 73
>> Bill
>> W7VP
>>
>> ----- Original Message ----- 
>> From: "Peter Voelpel" <df3kv at t-online.de>
>> To: "'Towertalk'" <towertalk at contesting.com>
>> Sent: Tuesday, August 15, 2006 6:53 AM
>> Subject: Re: [TowerTalk] TA-33 Classic Feed Model TAC-33K
>>
>>
>>> Hi Dave,
>>>
>>> To me that sounds more like a T-match
>>>
>>> 73
>>> Peter
>>>
>>> -----Original Message-----
>>> From: towertalk-bounces at contesting.com
>>> [mailto:towertalk-bounces at contesting.com] On Behalf Of WA3GIN @
>>> Arlington
>>> County, VA
>>>
>>> Hi folks,
>>>
>>> Just received a new TA-33M with TAC-33K feed.
>>>
>>> I've never seen a driven element feed like this one.  Its a clever
>>> implementation. Where the two ends of the driven element converge at
>>> the
>>> boom a hollow insulated coupling is provided so that the two sections
>>> slip into the insulator, making the connection water resistent and
>>> eliminating the need to split the feed-line coax wand weather proof
>>> the
>>> coax shield, etc. In the middle of the insulator is an SO-239
>>> connection. Inside the insulator there are two pieces of coax (I'm
>>> guessing RG8) center conductor (shield removed but insulation
>>> remaining
>>> with the ends swrink wrapped) that are simply slid inside each end of
>>> the driven element.  That is it.  No direct connection to the
>>> elements.
>>> I'm guessing this is Mosley's version of a "BETA" matching system.
>>>
>>> Any thoughts on this technique or clarification as to whether this is
>>> indeed a "BETA" match?
>>>
>>> 73,
>>> dave
>>> wa3gin
>>>
>
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