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

[Dave Shrader]

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
> 
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