[ICOM] RE: IC-PW1 Problem

[Jerry Keller]

Is there any way to correct ICOM's oversight and provide the missing 
protection for the PW1?
73, Jerry K3BZ
----- Original Message ----- 
From: "Adam Farson" <farson at shaw.ca>
To: "'ICOM Reflector'" <icom at mailman.qth.net>
Sent: Tuesday, November 07, 2006 2:47 PM
Subject: RE: [ICOM] RE: IC-PW1 Problem


> Hi Ken,
>
> The Yaesu Quadra has an interesting protective feature which the PW-1
> inexplicably lacks. There is a reflectometer in the antenna selector unit,
> right at the output and just before the antenna-selection relays. If load
> VSWR > 3:1, this reflectometer detects the mismatch and forces the 
> amplifier
> to standby.
>
> In 2000, the 20m trap on my former vertical (Hy-Gain DX-77) went 
> "smokorola"
> at 1kW. The output reflectometer caught it and shut down the Quadra. The
> only damage was to the trap (and to my nerves!)
>
> I have written a general article on solid-state amplifiers.
>
> http://www.ab4oj.com/quadra/sshfamp.html
>
> The IC-2KL was in the same power class as the Hercules II. A 2KL/AT-500 
> pair
> is an excellent choice for a 500W amplifier. The 2KL is also pretty well
> unbreakable.
>
> Cheers for now, 73,
> Adam VA7OJ/AB4OJ
>
>
>
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