[Amps] Keying Kenwood TL922 with Yaesu FT1000D (both old guys)

[Roger (K8RI)]

On 10/18/2013 6:38 PM, Dan Hearn wrote:
> Jean: I just finished building an interface to key my TL922 from my FT5000.
> The 922 has 120 volts on the keying line, too much for a small signal
> transistor. I debated with myself whether to use a high voltage rated
> transistor or a small vacuum relay. I selected the small vac relay because
> I had one in my parts supply. I think that 120 v is too much for most
> transceivers to switch but do not know the rating for the 1000. There many
> power transistors with collector ratings of several hundred volts and I
> think that is a good way to go.
> 73, Dan, N5AR

Great place for an opto-isolator.  I've used them to  key valves with 
just a logic input. Actually a BCD decoder and opto isolators. They are 
fast and rugged with the proper ratings. Cheap too and even available at 
radio shack.

73

Roger  (K8RI)
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