Someone ask what amp and rig. The amp is a Clipperton-L I converted to a
pair of GI-7BT tubes. Relay is 12 volts and draws around 100 ma when the
coil is energized. I haven't decided on a rig, but was considering a
TS-590SG. I see 10 milliamps is all the TS-590SG will switch. So, I
decided to re-engineer a Harbach SK-401 I had left over after installing
a ES4L4-B in my L-4B. Around 15 volts was the minimum voltage the
SK-401 would operate at, so I swapped R1 and R2, 22k 1/4 w resistors,
with 18K 1/4 watt resistors and the circuit will now operate with 12
volts, possibly lower though I didn't try it. I measured .788 milliamps
to trigger the SK-401, so I think it will be fine to use with the
TS-590SG or possibly any other modern rig. The youngest rig I have is a
Omni VI.
Thanks again for all of the replies.
73
Stan
KM4HQE
On 7/20/2019 9:34 AM, Glen Zook wrote:
Having 12-volts on the keying circuit (actually, usually, 13.8-volts)
is very common and I don't know of any "modern" transceiver that
cannot handle the voltage.
Glen, K9STH
Website: https://k9sth.net
On Saturday, July 20, 2019, 08:32:43 AM CDT, Stan Gammons
<s_gammons@charter.net> wrote:
How much voltage will modern rigs tolerate on the keying circuit? I have
an older amp that has a 12 volt relay. Will that fry the keying circuit
of a modern rig?
73
Stan
KM4HQE
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