Hi Bob,
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!
73
Stan
KM4HQE
On 7/21/2019 2:27 PM, Bob Wilson, N6TV wrote:
Stan,
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.
73,
Bob, N6TV
On Sun, Jul 21, 2019 at 7:45 AM Stan Gammons <s_gammons@charter.net
<mailto:s_gammons@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
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 <mailto: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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