[ICOM] IC-718 that dies on 30m, revives, dies again

[Frank Ellis]

Hi John,

Although I am not familiar with the IC-718, and based on the limited
information provided, what you are describing may be an indication of PA
oscillation. Hopefully someone familiar with the rig will have seen this
before and can offer better help than I can.

73, Frank W3UHF




On Thu, Jun 17, 2010 at 11:11 PM, John Fuller <jwfuller at verizon.net> wrote:

>
>
> My IC-718, now two years old, worked fine when I put up a dipole and began
> using it on 30 meters about a year ago. After a few months, however, it
> developed an erratic pattern of dying, then coming back to life, then dying
> again. At first it happened only rarely; today, it happens two-thirds of
> the
> time.
>
>
>
> The dipole is cut for a very low SWR. When the transceiver works, it shows
> 1:1 SWR and maximum power output. Then, all of a sudden, the power drops to
> nothing or almost nothing. Then it returns but the signal freezes into a
> constant carrier as I continue to send code. The SWR jumps all the way to
> the right side of the meter.
>
>
>
> Sometimes turning off the transceiver or changing bands several times
> restores normal operation. Most of the time it doesn't, however.
>
>
>
> Before I go to the trouble and expense of shipping this rig to Icom for
> repair, does anyone have experience with this problem or a suggestion for
> curing it?
>
>
>
> John Fuller
>
> K4HQK
>
> Alexandria, Va.
>
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