[1000mp] FT1000MP PA issue

Tue, 4 May 2004 07:14:01 -0400

Dave, I sent my mp back to Yaesu last year for a very similiar problem. They
replaced several of the drive transistors and several other discrete
parts(diodes, small switching transistors,etc).  I believe there are about 4
drivers and they replaced 2 or 3.

Hope this helps.

73 Dan W8CAR
----- Original Message ----- 
From: "David Robinson" <[email protected]>
To: <[email protected]>
Sent: Monday, May 03, 2004 6:13 PM
Subject: [1000mp] FT1000MP PA issue

> Returning from the 3B9C trip I switched on my FT1000MP to find the PA
> behaving strangely. The power rolls off severely with frequency
>
> On 160m the PA runs 22A and produces 140W
> On 40m the PA runs 20A and produces 110W
> On 20m the PA runs 8A and produces 45W
> On 15m the PA runs 5A and produces 20W
> 0n 10m PA runs 7A anp produces 40W
>
> The powers were measured at the output of the PA board
>
> I have measured the drive to the PA module and it is flat within +-1dB.
The
> bias voltages on the transistors seem correct, suggesting its not a
> transistor problem
>
> Has anyone else encountered and fixed this problem?
>
> Dave
>
> WW2R, G4FRE
>
> WEB: http://users3.ev1.net/~g4fre/ww2r.htm
>
>
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