Although I've not researched my documentation on the topic, I do recall
that one must jumper D2 on the QSK board to assure that the amplifier
would key correctly from the Omni VII.
As to release of the T/R relay, if Q4 on the QSK board is leaky or is
not turned off by U2 then the T/R relay will stay engaged. This will
require a bit of trouble shooting on the QSK board to determine the
exact cause as to why the T/R relay is being held engaged. Also, the RF
Sense transistor, Q3, being defective will command the T/R relay to stay
closed, even after RF is removed.
To my knowledge, there are no replacement boards available for the
Centurion series.
73
Bob, K4TAX
On 8/17/2018 5:15 PM, Jim Carragher wrote:
Tom
I had the same problem when I went from my Omni VI Plus to my new at the
time, Omni VII. Would not unkey. Sent the Omni VII back to Ten Tec, Paul
Clinton advised me to add a jumper across D2 on the QSK board. That was
October 2014. Did as instructed and no problems since. I had to remove
attached drawings from previous e- mail as file was too big. Hope this
helps. Jim K7IKN
On Fri, Aug 17, 2018 at 2:31 PM, Jim Carragher <k7ikn2@gmail.com> wrote:
Tom
I had the same problem when I went from my Omni VI Plus to my new at the
time, Omni VII. Would not unkey. Sent the Omni VII back to Ten Tec, Paul
Clinton advised me to add a jumper across D2 on the QSK board. That was
October 2014. Did as instructed and no problems since. Attached is Invoice
and drawing sent to me by him. Hope this fixes it for you. Jim K7IKN
On Fri, Aug 17, 2018 at 1:03 PM, Bob McGraw K4TAX <rmcgraw@blomand.net>
wrote:
Centurion does as well. Relay hanging up is most likely a component on
the QSK board.
Bob, K4TAX
Sent from my iPhone
On Aug 17, 2018, at 3:02 PM, Jim Brown <k9yc@audiosystemsgroup.com>
wrote:
On 8/17/2018 12:44 PM, Barry N1EU wrote:
Actually, I think it used an open-frame relay.
Could be -- I've never seen a Centurion. All the Ten Tec amps I've
owned (Herc I, Herc II, Titan 425s) use vacuum relays.
73, Jim K9YC
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