[Amps] Yaesu Quadra power output / meter accuracy / serial port

[Fern]

Hi Mark:

    I had purchased a used quadra a few years ago and found that when using 
the built in automatic antenna tuner that the quadra was loosing aobut 300 
watts thru the tuner. I promptly return the quadra to the selling dealer as 
they didn't believe me. All of that was proven going to a bird dummy load 
and watt meters.  Fern


----- Original Message ----- 
From: "Mark Hill" <g4fph at mjha.co.uk>
To: <amps at contesting.com>
Sent: Wednesday, February 11, 2009 3:27 AM
Subject: [Amps] Yaesu Quadra power output / meter accuracy / serial port


> Folks,
>
> According to an external power meter, my Quadra amp seems a little shy at
> making its rated output on the lower HF bands.  One these bands, the power
> meter display in the Quadra seems, however, to mostly to paint the 'up'
> side:
>
> Band / Drive / Quadra meter / Bird meter
> 160 / 50 / 1100 / 900
> 80 / 60 / 1100 / 950
> 40 / 65 / 1100 / 980
> 30 / 45 / 1100 / 960
> 20 / 50 / 1100 / 960
> 17 / 40 / 960 / 1050
> 15 / 40 / 900 / 1050
> 12 / 45 / 1050 / 1100
> 10 / 35 / 800 / 1000
>
> Pressing the amp with more drive, I can (just) get it to spec. as told by
> the Bird but, in so doing, I suspect any attempt at linearity lies 
> bleeding
> in the dust.  Interestingly, above 20 metres, the Quadra power meter seems
> to switch into pessimistic mode.  Reckoning that the Bird is at best
> accurate to 5% of FSD (and I was using a 2500H slug which was not ideal) 
> and
> the power meter in the amplifier is probably more like 10%, I'm not overly
> concerned as it's all near enough for jazz.  However, I wondered whether
> anyone on the reflector that has made similar measurements and would care 
> to
> comment?  I believe there was an ARRL product review of the Quadra back in
> Jan. 2002 which might have shed some light, but I can't find a copy on the
> Web.
>
> Having recently acquired a service manual for the Quadra, I note that 
> there
> is a second serial port on the main CPU, the TX and RX lines to which are
> (possibly!) brought out to pins 13 and 14 respectively on the band-data 2
> (15-pin D-type) connector. I say possibly because there is conflicting
> information on the two CPU card circuits included in the manual.  Has 
> anyone
> ever investigated what data these lines might carry?  I ask because I 
> drive
> the Quadra from a Kenwood TS-2000 which is part of my Internet Remote Base
> setup and would love to be able to get some data back from the amplifier
> telling me what it was doing when in operation as I dislike flying blind.
>
> Regards,
>
> Mark.
>
> *******************************************
> Mark Hill - G4FPH
> E-mail: g4fph at mjha.co.uk
> Current web pages at: www.g4fph.net
> Old web pages at: www.qsl.net/g4fph
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