[Johnson] keying

[Bry Carling]

Charles
 You can put a resistor from cathode to ground and key across that.  Like 22k maybe.  It will reduce the key-up voltage.  A small capacitor will reduce the sparks.  Best of all would be a simple conversion to grid block keying.
Bry AF4K

Charles Ring <w3nu at roadrunner.com> wrote:

>I'd like to use my Novice transmitter from 1963, a Johnson Adventurer, 
>with my Globe V-10 VFO and/or my WRL 755 VFO. The Adventurer has rather
>
>heavy cathode keying current, over 120 mA at over +150 volts, and draws
>
>a spark on my bug. Either VFO has much lower positive keying voltage
>and 
>current. I'd like to use my HA-5 T.O. keyer on this combination without
>
>ruining its sealed mercury-wetted contact keying relay, and without 
>another electromagnetic relay. Thinking that this has been solved long 
>ago, where can I find a circuit to accomplish this? The Adventurer has 
>no cutoff bias so it puts  out a lot of diode noise if keyed with no 
>drive. I have no objection to using modern techniques with my old gear.
>
>-- 
>*Charles Ring W3NU*
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regards,
Bry Carling

-- 
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