Sequencing of the relays is totally un-necessary, IF the the relays are
energized BEFORE RF is sent from the exciter.
73
Jim W7RY
-----Original Message-----
From: Vic Rosenthal 4X6GP/K2VCO
Sent: Wednesday, October 28, 2015 2:30 PM
To: amps@contesting.com
Subject: Re: [Amps] Tl 922 mods
W8ZR designed a sequencer board sold by Harbach which will protect your
relays, amplifier and transceiver. See <http://w8zr.net/QSK/index.htm>.
This is the best way. Whatever you do, you should read his QST article
that is linked there.
If you know that your transceivers provide enough time after asserting
key out and before producing RF, as well as a reasonable delay after RF
stops and before key out goes back to the receive state, then you can
just use a pair of vacuum relays or a vacuum relay and a reed relay to
replace the open frame relay in the TL922. Exactly how you do this will
depend on the coil voltage requirements of the relays that you use.
73,
Vic, 4X6GP/K2VCO
Rehovot, Israel
http://www.qsl.net/k2vco/
On 28 Oct 2015 23:04, Arnie Pfingst wrote:
I have a tl 922a with 10m amp driven by a Kenwood ts 940 or Yaesu ft
950 . It all works great except for the slow change over relay in the
amp. Im using the arb 704 interface for keying. I need a good mod for
the slow relay! After all this time I'm going to order the Harbach
soft start, and filter kit and will adjust the FIL voltage as needed.
Does anybody have any other ideas?ThanksArnie. Kd6cz
Sent via the Samsung Galaxy S®6 active, an AT&T 4G LTE smartphone
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