[ICOM] SWR tuning issue with IC-706MkIIG

[Michael G. Carper]

Thanks, Gary.

Yep, I'm within the band edges... operating unsplit.

I've taken the Turbo Tuner completely out-of-the-picture and have been
attempting to tune it manually (I've got a tune cube that I've had since the
days of my ATAS-100).  I know it works - used it with my ATAS-100 a few
weeks ago.  

This is all in my truck (www.wa9pie.net/hamradio) and I've had all this in
there for about seven years now.  This SWR thing has happened a couple times
before.  It went away.  Seems to be here to stay.

The SWR reading did move slightly when tuning the antenna, but not much.
Very strange.

Mike

-----Original Message-----
From: icom-bounces at mailman.qth.net [mailto:icom-bounces at mailman.qth.net] On
Behalf Of Gary Fiber
Sent: Saturday, January 08, 2011 5:04 PM
To: ICOM Reflector
Subject: Re: [ICOM] SWR tuning issue with IC-706MkIIG

Mike,
The power out control uses the built in SWR meter even if the display meter
is enabled or not. If the SWR circuit is not providing some sort of feedback
to the CPU it will not likely provide any output power.
Even though the display is a 1 to 1 SWR for all anyone knows the CPU could
be seeing something a lot higher and folding back the output power.
The 706 power out meters not measured by the 760MKIIG but a software
indication unlike the SWR is.

You are with in between the band edge beeps? If you are outside of those
beeps the rig will not transmit and no SWR will be displayed. This happens
too when you are in split mode and accidentally try to transmit out of band.

You mentioned something in your first email that you observed the SWR moving
about, did you see the meter doing that or assuming that would be happening
as the antenna was moved by the Turbo Tuner? I don't have access to your
first email on this computer.


The rig is mobile or base operated, I am asking to be sure the power source
can handle the transmit current requirements of the 706MKIIG, even something
like loose or dirty connections can cause issues.

So have you connected an external power meter to see if you have power out?

Have you checked the SWR with an external meter to be sure the radio is
incorrect, though while an antenna tunes I would think it should show
something.

Do you have or access to a dummy load to take the antenna system out of the
picture?

Have a friend who also owns an IC-706MKIIG to you could swap in your rig and
or parts of  your rig like the RF Deck or control head to see if the trouble
travels to his station?

A reset should have restored basic factory settings and basic transmit
capability. For what ever reason determined by the factory the CW transmit
is defaulted to off from the factory so you finding that condition after a
reset is normal.

The SWR circuit is much like the moni match SWR meter the ARRL handbook had
for years in it.

Hope some of this helps.

Gary K8IZ



On 1/8/2011 1:24 PM, Michael G. Carper wrote:
> Okay... found the CW break-in and turned it on (no idea why that would 
> be defaulted to OFF, but whatever).
>
> Problem remains - no SWR reading (yes, I'm absolutely certain that the 
> meter is set to SWR.  I've heard folks say there's some kind of diode 
> issue that comes up.  The radio is probably 10 years old now.  I may 
> send it in for a look (but would rather not, if I could find a simple
cause).
>
> Mike, WA9PIE
>
> -----Original Message-----
> From: icom-bounces at mailman.qth.net 
> [mailto:icom-bounces at mailman.qth.net] On Behalf Of Tom Bates
> Sent: Saturday, January 08, 2011 12:20 PM
> To: ICOM Reflector
> Subject: Re: [ICOM] SWR tuning issue with IC-706MkIIG
>
>    
>>> Update.
>>>        
> (After doing a CPU reset) Now the rig won't key the transmitter in CW 
> mode (though I can hear the sidetone).  Still no display of SWR.
>
>
>
> Did you turn CW break-in back on after the reset?  I think the default 
> is "off",  and if not set properly the rig will not give output in CW 
> mode even tho you can hear the sidetone.
>
> Tom  -  AA1NZ
>
>
>
> ----
> Your Moderator: Dick Flanagan K7VC: icom-owner at mailman.qth.net Icom 
> Users
> Net: Sundays, 1700Z, 14.316 MHz Icom FAQ: http://www.qsl.net/icom/ To 
> support QSL/QTH.net: http://www.qsl.net/donate.html
>
> ----
> Your Moderator: Dick Flanagan K7VC: icom-owner at mailman.qth.net Icom 
> Users Net: Sundays, 1700Z, 14.316 MHz Icom FAQ: 
> http://www.qsl.net/icom/ To support QSL/QTH.net: 
> http://www.qsl.net/donate.html
>
>    


--
Gary Fiber K8IZ
Washington State Resident

----
Your Moderator: Dick Flanagan K7VC: icom-owner at mailman.qth.net Icom Users
Net: Sundays, 1700Z, 14.316 MHz Icom FAQ: http://www.qsl.net/icom/ To
support QSL/QTH.net: http://www.qsl.net/donate.html