[Amps] Fwd: Re: Modern rig amplifier keying
s_gammons at charter.net
Sun Jul 21 17:09:15 EDT 2019
Thanks. That was one of the last pieces to this conversion that I've
taken forever to finish. Still undecided on how I want to do the tuned
input circuits. The amp is actually an in between model. It's labeled a
Clipperton-L, but it's actually a Cliiperton QRO. It has the center
tapped filament and the tubes sockets and tuned inputs are on a PCB that
mounts vertically to the divider panel. I thought about just copying the
existing PCB portion that has the tuned inputs and re-using the existing
parts. I also thought about building new tuned inputs with adjustable
coils. That would require a little more work though. Maybe I'll get this
project done before I become an SK.
Yeah, when I looked at the specs for the TS-590SG, it led me to believe
10 ma using the RL pin was all it would switch. Thanks for sharing the
info on mechanical relay!
On 7/21/2019 2:27 PM, Bob Wilson, N6TV wrote:
> Congratulations on getting this to work, but like most other modern
> radios, the TS-590SG has an option to enable an internal mechanical
> relay to key amplifiers that required more than 10ma. Unfortunately,
> it is poorly documented.
> See footnote 2 on page 55:
> *2 Mechanical Relay Operation. You can switch the signal of the
> high voltage like a vacuum tube linear amplifier. It is possible
> to control the terminal voltage of TL-922 (approximately -140 V).
> First set both Linear Amp menus No. 59 (HF) and 60 (VHF) to Option 3
> to enable the TS-590SG mechanical relay. Also rewire the amplifier's
> KEY IN to TS-590SG REMOTE Connector Pin 4 (MKE) instead of to Pin 7
> (RL), which is only used for silent solid-state keying of more modern
> amplifiers that require low current. REMOTE Pin 2 is ground /
> shield. See diagram on Page 73.
> The KEY OUT connector of an Elecraft K3/K3S (RCA) can key up to 200VDC
> at 5A (with no noisy relay). It also has a KEYOUT-LP pin on the ACC
> connector rated at only 10ma max, for more modern amps. No menu
> changes needed except TX DLY.
> Bob, N6TV
> On Sun, Jul 21, 2019 at 7:45 AM Stan Gammons <s_gammons at charter.net
> <mailto:s_gammons at charter.net>> wrote:
> 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
> 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
> 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.
> On 7/20/2019 9:34 AM, Glen Zook wrote:
> > Having 12-volts on the keying circuit (actually, usually,
> > 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 at charter.net <mailto:s_gammons at 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
> > of a modern rig?
> > 73
> > Stan
> > KM4HQE
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