[Icom] Question about Icom IC-706MK2G SWR Meter

[Bill Archer]

IC-706MKIIG Instruction Manual, page 38 near the top of the page on the
right hand side under  Measuring SWR..... (A) Spot Measurement...."1)
Confirm that the output power is over 30 W"

or (B) Plot measurement......"1) Confirm that the output power is over 30
W"

The BetterRF plug-in module "fools" the radio into thinking an AT-180 is
attached and generates a 10W CW signal to activate the AT-180 tuner.  On
page 62 of the IC-706MKIIG manual under Specifications for the AT-180
while the Maximum input power is listed as 120 W the Minimum tuning power
is listed as 8 W.

When I installed the rig in my van I assumed that with the BetterRF module
and the built-in SWR meter I could tune the High Sierra screwdriver I had
decided on.
While the rig would  show a SWR of 1.2 or so using the BetterRF module
when switching to full power SSB transmission the SWR could be well over
3:1.  Subsequently I installed an in-line cross-needle meter on the dash
to facilitate tuning the screwdriver. At low power(10W) the Icom meter
could show a 1:1 match only to have the meter go off scale at 100W.

I hope this explains my  position George, if you would like a
demonstration I would be glad to provide one.

Bill in Plano

"George, W5YR" wrote:

> Bill, that is the first Icom I have ever heard of that required more
> than a watt or so for a valid SWR reading. My PRO puts out only 1.55
> watts at min power setting and that is more than enough. Same with 765
> and 430.
>
> Is this something specified in the manual or does yours just happen to
> work this way - maybe have a problem?
>
> Got me really curious . . .  <:}
>
> 73/72, George
> Amateur Radio W5YR -  the Yellow Rose of Texas
> In the 57th year and it just keeps getting better!
> Fairview, TX 30 mi NE of Dallas in Collin county EM13qe
> K2 #489      Icom IC-765 #2349     Icom IC-756 PRO  #2121
>
> ----- Original Message -----
> From: "Bill Archer" <bfarcher@attbi.com>
> To: <icom@mailman.qth.net>
> Sent: Thursday, November 28, 2002 10:42 AM
> Subject: Re: [Icom] Question about Icom IC-706MK2G SWR Meter
>
> > The SWR meter in the radio needs at least 30 watts output to read
> properly, if you are using one of the BetterRF ( or clone) gadgets to
> generate a tuning signal the signal is only about 10 watts and will
> yield very low SWR numbers.
> >
> > For what it was worth.
> >
> > KC5GNB
> : http://www.qsl.net/icom/
>
> ----
> Your Moderator: Dick Flanagan W6OLD, icom-owner@mailman.qth.net
> Icom Users Net: Sundays, 1700Z, 14.315 MHz
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