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

[Bill Axelrod]

Adam,

     Thanks, again, for the kind advice.  The images on your website will go 
a long way to my investigating this problem.

     Yes, I see the same erroneous SWR readings whether the tuner in-line or 
not.

     Can't wait for a chance to get home, take it apart, and see what's 
what.

73...   Bill K3WA
----- Original Message ----- 
From: "Adam Farson" <farson at shaw.ca>
To: "'All about Yaesu 1000mp'" <1000mp at mailman.qth.net>
Sent: Sunday, December 16, 2007 6:51 PM
Subject: RE: [1000mp] Quadra (Was: May be off topic...)


> 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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>
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