Lou:

I have an MFJ versatuner somewhere around here, and I may just try it with
the THF6A on short-wave frequencies just to  see what happens.  I have real
front-end overload problems with an Icom W32A dual-bander that I use as my
2-meter and 440 HT in the office at the University where I teach, and
haven't figured out how to deal with that yet.  The versatuner, of course,
is only for the HF frequencies, so that won't help.

Anyway, interesting ideas here.

Best 73 from Tom Behler: KB8TYJ

----- Original Message -----
From: "Louis Kim Kline" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Saturday, April 24, 2004 12:11 AM
Subject: Tuning Receiver Front-Ends


> Hi to all.
>
> Reading Mike's post reminded me of a wonderful little passive preselector
> that I picked up at a hamfest for tightening up some receiver front ends
> that weren't very tight.  In my case it was the Icom IC-R100, but I
suspect
> it is the same kind of challenge that Mike has found with the THF6A.  The
> preselector that I found to be so helpful was the Grove Enterprises TUN-3
> Receiver Preselector, and it was "heads and shoulders" above the Ten Tec
> antenna tuner that I used on the HF rigs, when it came to tuning out
> unwanted signals on the receiver.  It consisted of a series LC circuit
that
> used a 365 mFd variable capacitor of the type commonly found in AM radios,
> and a inductor that was tapped for the various tuning ranges.  The
> preselector covered 100 kHz to 30 MHz.  While the tuning was pretty broad
> above 12 MHz, it was actually quite sharp in the medium wave and long wave
> frequencies.  Even at shortwave frequencies, I could get enough Q out of
it
> to dramatically improve the performance of the Icom R-100 which was prone
> to intermod and front end overload problems.  Even though the R100 has
been
> sold long ago, I hung onto that preselector, just in case I get another
> receiver that is a little loose.  I wonder if something like that would
> clean up the THF6A?
>
> 73, de Lou K2LKK
>
>
>
> Louis Kim Kline
> A.R.S. K2LKK
> Home e-mail:  [log in to unmask]
> Work e-mail:  [log in to unmask]
> Work Telephone:  (585) 697-5753