The TL-922 does not have snubber diodes across it 100V relays.
The back EMF spike will kill the KeyOut circuit in the K3.
*ALWAYS* use a key line buffer with a TL-922 that has not
been fitted with a soft key circuit.
73,
... Joe, W4TV
On 3/29/2023 8:25 AM, Mark Musick wrote:
Per the K3 manual page 17 the K3 can key +200VDC @ 5A.
No need to have a key line buffer if the amp keying voltage and current meet
those specs.
73,
Mark, WB9CIF
-----Original Message-----
From: elecraft-boun...@mailman.qth.net <elecraft-boun...@mailman.qth.net> On
Behalf Of James F. Boehner, MD via Elecraft
Sent: Wednesday, March 29, 2023 11:55
To: 'Josep Torres' <ea...@aol.com>; 'Elecraft Reflector'
<elecraft@mailman.qth.net>
Subject: Re: [Elecraft] TL-922
Josep,
Be sure to install a soft-key interface in the TL-922 before hooking it up to
the K3.
https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fharbachelectronics.com%2Fshop%2Fkenwood-tl-922%2Fsk-922-soft-key-keying-interface%2F&data=05%7C01%7C%7C3477a90435fe4f56f8db08db304cb2c8%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C638156878191285160%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=CtTlkUMq2f5c%2B0nckmeEK0YKKnhuYA1WQzNFfEbCFbo%3D&reserved=0
The newer rigs were not meant to handle the voltages on the older amplifier's
keying circuits.
I modified mine with the soft-key board and added the new capacitor block.
'73 de JIM N2ZZ
-----Original Message-----
From: elecraft-boun...@mailman.qth.net <elecraft-boun...@mailman.qth.net> On
Behalf Of Josep Torres via Elecraft
Sent: Wednesday, March 29, 2023 3:03 AM
To: Elecraft Reflector <elecraft@mailman.qth.net>
Subject: [Elecraft] TL-922
Hi guys,
Have a couple of Kenwood TL-922's around and was thinking to connect one to a
K3.
Has anybody done so.? And if so, how have you done the wiring.?
Got 2 K3's (in fact I have 3 of 'em, but one not physically at now now) and
maybe one day I can use the spare one with a TL-922 from another QTH.
Thanks,
73,
Josep
EA6BF
BUG #256 - CWops #3072 - FOC #2182 (ex 1724)
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