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

[George, W5YR]

Thanks for the detailed response, Bill - sorry if I came across as
sounding like I was doubting your word, but this is just something
really new to me. No demo required!  <:}

Very curious that so much output power would be required  for a valid
reading but perhaps our friend Adam, VA7OJ, can fill in the blanks.


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 8:50 PM
Subject: Re: [Icom] Question about Icom IC-706MK2G SWR Meter


> 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