[ICOM] IC-756PROIII No Transmit

[Adam Farson]

Hi Larry,

Good to see you participating in this discussion. The transition to the new
PA in the IC-756Pro3 is covered here:

http://www.ab4oj.com/icom/ic756pro3/pro3notes.html#new_pa 

I have owned the entire IC-756 line since 1998, and have never lost a PA or
driver device. In fact, I have been running an exclusively solid-state
station since 1989 without a single RF power device failure.

The IC-7600 PA Unit is a 100% Mitsubishi MOSFET line-up: RD6HVF1 pre-driver,
2 X RD15HVF driver, 2 X RD100HHF1 PA. The 2SC1972 is no longer used.

Cheers for now, 73,
Adam VA7OJ/AB4OJ




-----Original Message-----
From: icom-bounces at mailman.qth.net [mailto:icom-bounces at mailman.qth.net] On
Behalf Of Lawrence Young
Sent: 24-Mar-09 09:18
To: ICOM Reflector
Subject: Re: [ICOM] IC-756PROIII No Transmit


   I am in communications frequently with the Icom service facility in SC. I
have been told that rarely does the BJT final transistors fail in the Pro
line. It usually is driver failure.
   The reason that Icom changed to FET transistors in the Pro series is
because Mitsubishi their supplier for the PA transistors discontinued their
BJT power transistor line.
   A search of the ProIII groups archives will confirm this.
Larry K4LXV