[1000mp] Quadra (Was: May be off topic...)

[Adam Farson]

Hi Bill,

One additional question: Do you see the same erroneous SWR readings with the
tuner in and out of circuit?  

The fact that you are seeing a 3.4:1 SWR reading at your exciter as well as
on the Quadra's SWR scale suggests that something in the signal path is
introducing reactance. If the high reading occurs with the tuner in-line,
this may indicate damage in the tuner area. If not, the damage may be in the
output T/R relay (I suggest this because you see the same error with the amp
in standby, which eliminates the LPF's.)

It may be a good idea to take the case covers and internal shields off the
PA cabinet, and look/sniff for burnt components. You can click the interior
pictures on my Quadra page for larger images to use as a guide. VS should
still have the service manual in stock.

http://www.ab4oj.com/quadra/main.html

Hope this helps.

Cheers for now, 73,
Adam VA7OJ/AB4OJ


-----Original Message-----
From: 1000mp-bounces at mailman.qth.net [mailto:1000mp-bounces at mailman.qth.net]
On Behalf Of Bill Axelrod
Sent: 16-Dec-07 15:37
To: All about Yaesu 1000mp
Subject: Re: [1000mp] May be off topic...

Adam,

     Thanks for the info.  The Amp actually works with the tuner engaged or
disengaged.  I get full power.  The turner tunes when engaged.  Just that
the VSWR reading is wrong and some component(s) are burning.  Even with the
amp in standby something changes the VSWR.

     For example, with the amp in standby my dummy load reads a 3.4:1 VSWR
on both the amp's meter and on my transceiver.  When I connect the dummy
load directly to the xcvr it shows a 1:1.

Thanks again...   Bill
----- Original Message -----
From: "Adam Farson" <farson at shaw.ca>
To: "'All about Yaesu 1000mp'" <1000mp at mailman.qth.net>
Sent: Sunday, December 16, 2007 5:00 PM
Subject: RE: [1000mp] May be off topic...


> Hi Bill,
>
> There is no Quadra reflector as far as I am aware. I have a Quadra page on
> my website:
>
> http://www.ab4oj.com/quadra/main.html
>
> Apart from the VS service centre in Cypress CA, Bill Grassa N4ATS may be
> able to assist you. His e-mail address is listed in his QRZ entry. It 
> sounds
> as if there may be some damage in the low-pass filter area. Doe the
> amplifier operate correctly with the autotuner disengaged?
>
> Cheers for now, 73,
> Adam VA7OJ/AB4OJ
>
>
> -----Original Message-----
> From: 1000mp-bounces at mailman.qth.net 
> [mailto:1000mp-bounces at mailman.qth.net]
> On Behalf Of Bill Axelrod
> Sent: 16-Dec-07 13:47
> To: 'All about Yaesu 1000mp'
> Subject: [1000mp] May be off topic...
>
> If this is off topic - go ahead and flame me if it makes you happy.
>
> I DO have a FT-1000MP MK V.  It works well (knock wood).
>
> I also have a Yaesu Quadra amp which does not work well.  It reports a 
> very
> wrong SWR (either high or low depending on band) and now had the sweet 
> smell
> of frying components.  It does put out full power.
>
> Anyone have an idea what/where I should look or perhaps anyone who repairs
> these amps?  Or, if off topic, is there a Quadra refelctor?
>
> Thanks and 73...   Bill K3WA
>

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