[ForSale-Swap] FS: T Network Antenna Tuner Kit (a.k.a. The Ultimate Transmatch).

[Carl]

As initially designed McCoys tuner was coax to coax and the coax to open 
wire balun came along later.

The trouble with most T's is insufficient C for 160 as they only use 
240-250pf where 500 is needed to keep the efficiency high and not fry the 
coil. Some even need more C on 80 depending on the antenna.

MFJ tuners were known for many years to catch on fire.

I built a T ages ago with 500pf/3.5kV Johnson/Cardwell 153-6 caps and a much 
larger physical size 30uh roller coil than the Johnson/Multronics 229-203. 
Its been on a shelf for about 30 years now as everything is coax fed and the 
amps have been modified to tune into any reasonable SWR such as covering 3.5 
to 4 MHz.

Carl
KM1H



----- Original Message ----- 
From: "rbethman" <rbethman at comcast.net>
To: <forsale-swap at mailman.qth.net>
Cc: "To Possibilities" <topossibilities at verizon.net>
Sent: Friday, November 19, 2010 11:57 AM
Subject: Re: [ForSale-Swap] FS: T Network Antenna Tuner Kit (a.k.a. The 
Ultimate Transmatch).


This "should" be able to be constructed into a PI matching antenna
"matcher"/"tuner".

I only mention this as the UT-2000, being a "T" network, does NOT work
with all equipment.

This ESPECIALLY the instance if one is trying to "match" a BC-610 to an
antenna system.  The BC-610 WILL NOT work with a "T" matcher!

Consider that 250THs aren't cheap.

Bob - N0DGN

On 11/19/2010 10:34 AM, To Possibilities wrote:
> T Network Antenna Tuner Kit (a.k.a.  The Ultimate Transmatch).
>
> Capable of matching an extremely wide range of loads.
>
> Continuous coverage from 1.6 to 30 Mhz.
>
> Included are (2) EF Johnson P/N 154-1-5, 244pF 2KV variable capacitors,
> (1) EF Johnson P/N 223-209-1, 28 uH 5 Amp roller inductor, (2) EF
> Johnson P/N 116-262, 2 3/4" knobs w/ skirt numbered 0 - 100, Groth TC-2
> turns counter and spinner know, (1) ceramic feed though, (2) Insulated
> couplings, (1) special flexible shaft coupling, (2) SO239s, (2) 1/4"
> round shaft extensions, (2) panel bushings and miscellaneous items (e.g.
> solder lugs, metal stand-offs, 14 ga silver plated Teflon wire etc.).
>
> All parts are new.
>
> Note: The above parts are the same as used in the balanced T network
> tuner, which is pictured on page 2 at my web site:
>
> http://mysite.verizon.net/resota6z/
>
> Price $139 + shipping
>
> Ed, W1AAZ
>
> w1aaz 'at' verizon.net
>
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