[Collins] 30L1 to 706

[Dr. Gerald N. Johnson]

On Thu, 2007-05-17 at 10:51 +0000, Gene Dathe wrote:
> Hello all;
> 
> I'm new to the list so this may be an old question.
> 
> I want to hook up a 30 L1 to an Icom 706MK2G.  Where might I find a 
> schematic/pinouts for this?  I've never operated the amp before so I'd like 
> to get it right the first time... Thank you in advance for your time.
> 
> 73 de NAG  Gene
> 
You will need some sort of PTT output from the 706 and it will need a
relay or transistor interface to the 30L-1. 30L-1 keying voltage is
about -140 volts open circuit and probably as much as -50 ma closed
circuit. I don't know what outputs the 706 has, but often there is a
circuit grounded for transmit or a +TX voltage that can be sampled to
run the relay to key the relays in the 30L-1. Typical solid state output
from the modern exciter will be fried instantly if connected to the
30L-1 control input directly.
-- 
73, Jerry, K0CQ, Technical Advisor to the CRA
All content copyright Dr. Gerald N. Johnson, electrical engineer