[ICOM] SWR problem on 706Mk2G

[John Geiger]

on 6m it was 3:1, where it is flat on other radios.  On 15m it would bounce
between 3:1 and infinity.  It normally has a 2:1 SWR due to some
interaction with steel siding on the house.

73 John AF5CC

On Fri, Dec 25, 2015 at 10:23 PM, Gary Fiber <gfiber at comcast.net> wrote:

> Good, that will be a good test. Sounds like neither have traps. How high
> was the SWR? Still might be a power amp issue.
>
> Gary P. Fiber K8IZ
>
>
>
> > On Dec 25, 2015, at 8:18 PM, John Geiger <af5cc2 at gmail.com> wrote:
> >
> > Hi Gary,
> >
> > On 15m it was using a monoband 15m Moxon, and on 6m a 3 element monoband
> > yagi. I had a different 706MKIIG a few weeks ago and don't remember these
> > problems. Just picked up another 706MKIIG so will try it out when I get
> > home and see if I get the same results.
> >
> > 73 John AF5CC
> >
> >> On Fri, Dec 25, 2015 at 3:18 PM, Gary Fiber <gfiber at comcast.net> wrote:
> >>
> >> What kind of antenna is it? If not a dipole and have the room, build one
> >> up and see if that changes the outcome the the affected bands. Antennas
> >> with a lot of tuning traps can be problematic.
> >>
> >> Have or can you borrow an antenna analyzer to see if the antenna
> exhibits
> >> either inducting or capacitive reactance on the bands the 706 does not
> like
> >> ?
> >>
> >> You may have to make some antenna adjustments to neutralize the
> reactance
> >> as much as possible. Though as many will say that component will never
> >> generally reduce to nothing, but you may make the antenna useable with
> the
> >> 706.
> >>
> >> Have a ham friend near by to test the 706 on his antenna system?
> >>
> >> In my 11 years at Icom, there were times SWR issues were from a final
> amp
> >> being
> >> Spurious. Generally it was due to the amp oscillating for some reason.
> >> Possibly as another suggested a faulty low pass filter if within the
> radio.
> >> Also an oscillating final many times presents no output power control.
> Also
> >> ran into weird issues with some antennas so testing into a non reactive
> >> load was in order.
> >>
> >> Did you get a chance to try the 706 into a dummy load?
> >>
> >> Sorry I do not have a better answer.
> >>
> >> Gary P. Fiber K8IZ
> >>
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