[1000mp] Mark V high SWR with amp

[Gene Davies AA6NP]

Well it seems that

If the output swr at the amp or tuner output is ok
and....

If the MK5 shows a normal swr when the amp is in
standby or bypassed...

Then the problem has to be in the amplifier input.


Try switching radios if you can, and check if
another rig also sees this high swr.



GL 73,
Gene






----- Original Message -----
From: Michael W Elliott <kq0b at sbcglobal.net>
To: All about Yaesu 1000mp
<1000mp at mailman.qth.net>
Sent: Sunday, February 06, 2005 8:41 AM
Subject: Re: [1000mp] Mark V high SWR with amp


> Well let me replay the descriptiomn.
>
> The amps are Alpha 99 and Alpha 89.
>
> These are modern amps.
>
> Next:
>
> The swr on the out meters of a Bird and Nye
Viking Tuner show output swr fine.
>
> Swr on amplifier says ok
>
> SWR when running barefoot no problem on the rig.
> Once I switch on the amp the problem occurs.
Seems like there is a mismatch back to the input
side althought the output side says everything is
ok.
>
> I will call Yaesu on Monday and describe the
situation.
>
> Only other thing  I can think of is NKE Viking
tuner being in line.  Gonna take it out of line
and run and see what happens.  Would sound strange
if the tuner but could be possible.
>
> Mike
>
> Gene Davies AA6NP <aa6np at mind.net> wrote:
> It sounds like you are saying that your set-up
WAS
> working fine, but now you have a high swr when
> running with your amp. Try inserting an swr
meter
> between the two to verify the reading on your
MK5.
> If the reading is high, there is a problem with
> the amp. It could be a problem with the amp's
> input circuit (tuned or broadband), this is not
> likely though.. It could also be a bad tube in
the
> amp. Also check the transmit/rcv relay in the
amp.
>
> 73,
> Gene
>
>
>
> ----- Original Message -----
> From:
> To: <1000mp at mailman.qth.net>
> Sent: Sunday, February 06, 2005 7:37 AM
> Subject: Re: [1000mp] Mark V high SWR with amp
>
>
> > In a message dated 2/5/2005 7:33:35 PM Central
> Standard Time,
> > kq0b at sbcglobal.net writes:
> > I have started to notice a high swr reading on
> the
> > input side (transceiver) while running with
amp.
> > Hello,
> >
> > Your problem is due to the fact that your
> amplifier does not have a tuned
> > input circuit. A modern amplifier that is
> designed to work with modern solid
> > state trasnceivers has a tuned input circuit
for
> each band the amplifier
> > functions on.
> >
> > You can simply use the internal antenna tuner
to
> match the radio to the
> > amplifier, you may need to retune the
amplifier
> slightly after you auto tune the
> > radio.
> >
> > Enjoy and 73
> > Douglas
> >
>
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> Michael W. Elliott
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