[Mobile-Portable] Re: Question about HF mobile - SWR"Sensitivity" - CAUTION

[Larry Comden]

Jim,

See AD5X web site for a circuit that can be used for forcing the 706 into
tune. this is for use with non-ICOM tuners like the SGC 237/239.


73 and GL

Larry K3VX
----- Original Message ----- 
From: "Jim Miller" <JimMiller at STL-OnLine.Net>
To: "Mobile-Portable Reflector" <mobile-portable at mailman.qth.net>
Sent: Tuesday, July 17, 2007 07:57 AM
Subject: Re: [Mobile-Portable] Re: Question about HF mobile -
SWR"Sensitivity" - CAUTION


> It is a good idea to begin any testing or adjustment of a manually
operated
> tuner into an unknown load using LOW power.  Adjust the tuner to minimize
> the SWR and then ease the power up until you have it adjusted at full
power.
> This will ease strain on the radio.  For the 706 (also 746?), there is a
> "module" you can get that will automatically lower the output power to 5
or
> 10 watts when the tune button is pressed.  This eliminates the need to go
> into the menu system to do this.
>
> 73, de Jim KG0KP
>
> ----- Original Message ----- 
> From: "Gary Pearce KN4AQ" <kn4aq at arrl.net>
> To: "Mobile-Portable Reflector" <mobile-portable at mailman.qth.net>
> Sent: Tuesday, July 17, 2007 6:17 AM
> Subject: [Mobile-Portable] Re: Question about HF mobile - SWR
"Sensitivity"
>
>
> > At 06:10 PM 7/12/2007, you wrote:
> > >Ok guys another question about this mobile setup of mine.
> > >
> > >I put the 706 in low power and Swr is flat, I bump it up to medium or
> high
> > >power and swr's go abt 2.3:1...
> > >
> > >Why do they do that on high power?
> > >
> > >73,
> > >Brian
> >
> > I have the same experience with my 706.  Here's why...
> >
> > You'll notice that the 706 lacks the "sensitivity" control found on most
> > external SWR meters.  The meter is not designed to operate at low power.
> > The manual says that when measuring SWR, "Confirm that the output power
is
> > over 30 W." (page 38).  So the meter is not giving you an accurate
reading
> > at low power.  Your SWR is really about 2.3:1.
> >
> > 73,
> > Gary KN4AQ
> >
> >
> >
> > ARVN: Amateur Radio//Video News
> > Gary Pearce KN4AQ
> > 508 Spencer Crest Ct.
> > Cary, NC 27513
> > kn4aq at arvidnews.com
> > 919-380-9944
> > www.ARVidNews.com
> >
> >
> > ----
> > Your Moderator: Dick Flanagan K7VC,
mobile-portable-owner at mailman.qth.net
> >
>
> ----
> Your Moderator: Dick Flanagan K7VC, mobile-portable-owner at mailman.qth.net
>