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

[Uwe Fleischer]

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