Fw: Re: [Antennas] WTD: Balanced Output Tuner Plans
Sandy and Kees Talen
[email protected]
2003年1月17日 20:27:00 -0600
Interesting point. Keeping "good contact" is a major problem,
though and that wire is pretty lossy.....
Roller inductors cost money, are low Q (probably because of
roller resistance as it picks up "stuff" and the metal framework),
and they are high loss in the tuner if you use the ones with smaller
wire, but they do allow the needed "infinite adjustability".
Tapped Inductors are high Q but the fixed taps are limited to
where you put them (hopefully to match YOUR antennas) and if
you loan it to a friend with different impedance antennas/
transmission lines, he won't like it unless your taps are alligator
clips). Moving alligator clips is a pain.
What we need is a variable, high Q inductor, using cheap stuff
like PVC.
Lets see ...this giant slug tuned coil using cheap cable toroids.
....just kidding.
73 Kees K5BCQ
--------- Forwarded message ----------
From: Chris BONDE <[email protected]>
To: [email protected]
Cc: "Rob Matherly" <[email protected]>,
<[email protected]>,
<[email protected]>
Date: 2003年1月17日 16:52:19 -0800
Subject: Re: [Antennas] WTD: Balanced Output Tuner Plans
Message-ID: <[email protected]>
Instead of roller inductors, I have been wondering about the inductor on
the screw driver type antennas. If one could build this type of inductor
in the shack with a plastic gear and windlass, how would it work compared
to the roller inductor, that has inductance after the contact point.
Just a question to find out more info.
Chris opr VE7HCB
At 04:53 PM 2003年01月17日 -0600, Darryl J. Kelly wrote:
>Rob,
>Recently built a a balanced output tuner made with 2 roller inductors
with a
>capacitor across the output. Uses a 1:1 balun on front end. Simple
>electrically,
>a little more complicated mechanically. Roller inductors ganged with
sprockets
>and matching belt. Works great, mine still in breadboard form. Recent
QST
>article
>(which I can't find) showed circuit and construction. This is my main
tuner
>for my balanced line. Hope this is of interest.
>Darryl, KK5IB
> >Hi all;
> >
> >I'm wanting to build a tuner with a balanced output. Can anyone point
me to
>> >plans for one? I'm not smart enough to design it myself ;^)
> >
> >--
> >72/73/oo - Rob, w0jrm - [email protected] - ex-kc0bom - oink d'oink
> >ARRL, FPQRP -330, SOC #497, QRPp-I #19, IAQRP #143, ARS #1143
> >Rigs: KWD TS-820; Drake TR-3; MFJ 9040
> >http://www.qsl.net/w0jrm
> >
> >- - -
> >
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