Don-- I haven't seen an answer to this yet, so I'll take my best shot
although there are better experts than I am.
For my Flex 5000, the voltage limit is 50vdc, so 120vdc would smoke it.
Maybe did you mean 12 vdc?
Current is 400 ma so the 100 ma would be OK. I don't know what the
limits are on the Flex 3000, I just have my 5000 specs.
Also, my guess (again I don't know) is that the keying line is pulling
down a relay in the HL-2200. Relays have windings with inductance, and
I would be concerned that when the Flex unkeys, it would generate a high
voltage back-emf spike as the relay coil field collapsed back into the
keying transistor in the Flex, smoking it. So as a minimum, a back-emf
protection diode would be needed across the relay in the HL-2200 (if it
really has one).
Probably easiest to let the Flex key a buffer relay in your situation.
You could make it work direct though with a little soldering.
Steve WA7DUH
On 8/17/2011 6:34 PM, Don wrote:
From what I have read in the manual I should be able to do a direct connect to
the keying relay circuit in an HeathKit HL-2200 amplifier.
The keying relay has about 120 VDC at 100 ma. on it. I just wanted to check
here an make sure.
Also does anyone know that device is being use to obtain the 2.5 ms switching
time?
Don
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