*The Filter Board has relays which as the name suggests, switches different
filters in and out of the Transmitter Circuit, depending upon which band
you have selected. When this happens to your radio, have you tried
switching to a Dummy Load and changing bands? Your problem COULD be caused
by a bad relay or component located on the Filter Board. By using a Dummy
Load you should see a good SWR no matter what band or frequency selected.
By switching bands, you would be using a different Relay and set of
components on this Filter Board. To be more specific you could have a
problem on the Low Pass Filter Board. The Manual has a description of this
circuit and how it works. There are Ten Tec Gurus here who are much more
knowledgeable than me. I am sure they will be able to come on board with
more specific information. Just hope that I have helped in maybe, putting
you on the right track to cure your problem. I guess the question should
be, does this happen on just 40 meters?*
*
73 de Wade/KJ4WS
*
On Thu, Nov 15, 2012 at 5:23 AM, Vic Klein <vhklein@ptd.net> wrote:
> Lately an odd problem has shown up that I would like some help on.
> Periodically the SWR indicated on my 585 Paragon will jump to around 3:1
> and
> the output power will drop off to about 1/4 the normal amount as seen on an
> external wattmeter. This is when an external SWR indicator still shows 1:1,
> or very close to that. The symptoms were such that I suspected the external
> autotuner was at fault, but the radio produces the same symptom on an old
> manual tuner, as well. When the SWR is showing high on the radio no
> adjustments on the external tuner have any effect. This happens most often
> when the rig has been in transmit use for a while on 40m and the receive
> seems unaffected. It seems to revert to normal later, but with 20 minutes
> of
> use, or so, it returns to this condition. Does anyone have suggestions
> about
> where and what I might look for? Thanks.
>
> =Vic=
> WA4THR
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> TenTec@contesting.com
> http://lists.contesting.com/mailman/listinfo/tentec
>
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