[Icom] Service Manual for IC 706 MK II W/Problems

Tue, 27 Aug 2002 12:51:30 -0400

Dave ,

Thank you very much for your input and information, Yes your right about the
averaging meter and I will compare it with my other rig for correct output
readings.  Your help and attention to my problem is greatly appreciated.

Eric  N4HGZ

Dave Shrader wrote:

> The output power on SSB is normal for an averaging type meter. The meter
> movement cannot respond quickly enough to find voice peaks. So, it makes
> an 'average' reading.
>
> Sounds more like rf feedback getting into the mike circuit. I added a
> ferrite bead choke on my coax just below the antenna and added several
> additional ground straps from the antenna mount to car chassis.
>
> W1MCE
>
> Eric Wilson wrote:
> >
> > Hi,
> >
> > I am having problems with my IC 706 MK II and will elaborate:
> >
> > I had my 706 in the car while driving and I confirmed that my battery
> > condition was good with plenty of charge.  Today I was on 24.940 with
> > speech compressor on with mic gain at 5 running 100 watts with the rig
> > cool and got several reports from breaking stations of distorted
> > modulation and splatter.  Did test with station in Colorado and with
> > turning my comp on and off and the Colorado station told me the that I
> > was 100 % copyable with the comp off.
> >
> > Upon further testing on an Astron RS 50 M into a verified antenna I came
> > to the following conclusions:
> >
> > We had problems resetting the CPU with it trying to hang up in the self
> > test but finally got the procedure successfully completed.  Note " This
> > rig was modified several weeks ago with the info gathered from Mods.DK
> > to open the TX in anticpation of us getting the 60 meter band.
> >
> > Doing further testing it was concluded that :
> >
> > The audio was dropping out with working SSB in a normal voice and low
> > power was observed on a known good watt meter as showing approx 20 to 30
> > on SSB , 100 on CW and only 55 on 10 m FM with the power setting on
> > high.  Am power was measured at 30 watts. RTTY was measured as full
> > output at 100 watts.
> >
> > I would greatly appreciate any information that you could provide on my
> > problem and I am looking for a good copy of a service manual and would
> > be willing to pay for the copying costs and postage or a used service
> > manual at a fair price.  I wonder if anyone has a service manual scanned
> > ?
> >
> > Thanks,
> >
> > Eric   N4HGZ
> >
> > ----
> > Your Moderator: Dick Flanagan W6OLD, [email protected]
> > Icom FAQ: http://www.qsl.net/icom/
> ----
> Your Moderator: Dick Flanagan W6OLD, [email protected]
> Icom FAQ: http://www.qsl.net/icom/