[1000mp] AW: ARB-704 and Yaesu Mark V

[Win]

Not a bad idea.  I would make sure not to exceed the current rating of the 
voltage supplied by the transceiver.

Win

----- Original Message ----- 
From: "Uwe Fleischer" <uwe.fleischer at asco-online.com>
To: <1000mp at mailman.qth.net>
Sent: Wednesday, November 29, 2006 2:18 PM
Subject: [1000mp] AW: ARB-704 and Yaesu Mark V


> Hello,
>
>
>> The easy and cheep way to key almost any amplifier is to use a MPSA42
>> transistor to switch the amp.  It is in turn switched by a low current
>> switching transistor (2n3906, 2n3904 etc.)
>
>
> If I had to build such a circuit, I'd not use a low current switching
> transistor, but an opto-coupler (e.g. HP 4Nxx) to be on the safe side. 
> This
> additionally prevents potential problems with voltage differences, surges
> and RF-coupling into the cable :-)
>
> 73 de Uwe, DL8UF
>
>
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