[Amps] Yaesu Quadra circuits wanted

[Mark Hill]

Folks,

Does anyone have an electronic copy (or even a paper one, come to that!) of
the circuits / service manual for the Yaesu VL-1000 (Quadra) amplifier?

I have recently completed a PIC-based interface to allow my TS-2000 to
control the Quadra in a Internet Remote Base (IRB) application.  Now I can
power the amp. on and off remotely and the amp. tracks band changes made on
the TS-2000 TX.  Problem is, with the amp. having no control port, the
control-side runs a little blind (poke and hope!).  Pointing a web cam at
the amp.'s front panel works, but it's somewhat crude and chews up Internet
bandwidth.  If I had the circuits, then perhaps I might be able to extract a
few useful status signals from the CPU circuitry.

I would also like to investigate making the Quadra auto ATU work at lower
power levels.  The amp. will give full power out with around 40 W of drive
on most bands, but the auto ATU will not operate with much less than 100 W
of drive.  Connecting the ALC up might sort this, but I prefer just to give
the amp. the drive it needs and no more.

It's a pity that Yaesu have not refreshed the design of the Quadra in the
control department.  They must have lost quite a few sales to the SPE Expert
as a result.  For my money, the Quadra, old as it may be, is still the
better of the two as an RF tool.

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
----------------------------------------------------------------------
Dipoles resonant on 1940 / 3685 kHz
----------------------------------------------------------------------
Remember - SIDE for HV safety:
S witch off
I solate
D ump
E arth
*******************************************