[ICOM] I did not do a good job on my 706 and AH-4 question

[Bill Gode, Sr.]

The TH7 is NOT designed to work on 17 and 12 meters - period.  Regardless of 
the tuner used and the "match" it presents to your transceiver, high losses 
will still exist in the coax line to the TH7 and you will have nothing but 
miserable results.  The TH7 also uses traps, which could blow out - provided 
you got enough power to the antenna with the high SWR it undoubtedly 
exhibits.  To expect the built-in tuner in an MP (or any other rig) to match 
a coax-fed trap antenna cut for the wrong band is simply ridiculous.  This 
is not what those tuners were designed to do.

If you want to get on 17 and 12 meters with the minimum amount of effort for 
the maximum amount of results, buy a WARC band dipole, or build a simple 
2-band wire dipole attached to bamboo or fiberglass poles and stick it above 
your TH7.

73,

Bill, W9NHQ


----- Original Message ----- 
From: <W4ABW at aol.com>
To: <icom at mailman.qth.net>
Sent: Monday, June 06, 2005 3:26 PM
Subject: [ICOM] I did not do a good job on my 706 and AH-4 question


> Let me try this again.
>
> I am not trying to determine which ant to buy.
>
> I use now a perfectly good TH7 (yes 3 bands) and a perfectly good 80 m
> dipole and my present radio (1000MP) is a good radio and I work almost all 
> I  hear
> on 20,15 and 10.
>
> I picked up a 706 MKIIG at lower than the old price so now have another
> radio. With my MP and TH7 I had almost no success wkg 12 and 17. Maybe the
> internal built in tuner on the MP does not like the TH7 on 12 and 17 only. 
> It  loves
> 20,15 and 10, only.
>
> My q was .. if I get the ICOM tuner, AH-4 and use it with my new 706 and 
> my
> SUPERB (on 20,15,10) TH7 or the 80m dipole (also superb) should I expect 
> that
> I  could hear/work more DX on 12 and 17 ?
>
> The MP just does not like to play on 12 and 17 with my present TH7.
>
> Any better ?
>
> Al,   W4ABW