- We tested the FT-897 and found that while it might drop power when the
coupler had to make a really major change, everything worked well. Here is a
link to a report on your results:
The tuner will continue until it reaches to lowest SWR it can manage, 1:1 if
I have used the SG239 on long and short antennas. On short antennas, it
needs to be nearer to resonance or higher in frequency. I've run a whip
dipole (about 10 foot legs) on 80-10 successfully. Results will vary with
the antenna, your need for RF Grounding (and of course the quality of your
RF ground if you need it). For shorter antennas, we usually recommend the
SG237, but people have used the 239 in cars and elsewhere.
You can find comparative information on the couplers at
Feel free to drop me a line if you have any questions.
----- Original Message -----
Date: Mon, 31 Mar 2003 13:55:53 +0200
From: Björn Mohr <bm@...>
Subject: SV: Smart Tuner question
> I have an SG-239 smart tuner and it works great. This is the
> one where you have to supply a weatherproof case. They all
> like to have an random wire with a counterpoise as opposed to
> a balanced dipole or coax fed antenna. They will tune just
> about anything in a matter of seconds as there are many
> possible LC combinations. They are built very well and SGC is
> a good company to deal with. I have seen where some guys are
> taking a control voltage from the 897 off the CAT jack and
> that seems to be a good idea.
I just found out about the SG-239 and it seems very interesting for my
I assume that the FT-897 and SG-239 works together and are not having the
same problems as been reported with others tuners caused by the sensitive
SWR protection in the 897?
The specs says < 2:1 SWR... 2:1 would make the 897 reduce power alot! What
are the average tuning results you have experienced. Has to be way below 2:1
I am planning to use mine with a 28 Mhz vertical antenna + countepoise for
40-12 meters. This way I will get something portable and low profile. Also
would like to try it with even shorter antennas for mobile operation.
73 de Björn /SM0MDG
Having just this week bought the FT897 and a SGC297 I would very much appreciate your recommendation for simple counterpoises for the 80m,40m,20m,15m,12m, 10m, amateur bands for short duration field operation.
i.e vehicle mounted whip antenna operated when parked up.
(Military Landrover at shows)( and for Scouting events.
Many books give info on antenna /aerial elements but not many on counterpoises.
73 and many thanks
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