I used my OM6 with Ameritron amps, no problem; because I used an external keyer
with built in time-sequence keying.
Originally I used my own home-brew keyer; ugly but effective. I built it with
a fixed 25mS TXD and variable Hang.
Later I bought an MFJ Millennium MFJ-495 keyer.
It has front-panel adjustments for the front-end TX Delay (TXD) as well as
back-end hang-delay.
https://mfjenterprises.com/collections/mfj-enterprises/products/mfj-495
This is cheaper than buying a new amplifier.
73,
Rick, DJ0IP
(Nr. Frankfurt, Germany)
May the Sunspots be with us!
-----Original Message-----
From: TenTec <tentec-bounces+rick=dj0ip.de@contesting.com> On Behalf Of Bob
McGraw K4TAX
Sent: 27 March 2020 16:41
To: tentec@contesting.com
Subject: Re: [TenTec] Omni Vl Plus Amplifier Switching
Barry et al:
To the best of my knowledge, having owned 2 of the Tentec Omni VI Plus
transceivers, there is no RF delay upon key closure. Thus the radio is
designed to work in QSK mode with the Tentec series of amplifiers. Thus the
delay is effectively incorporated in the amplifier. This then places the delay
in the TX EN line.
As to using the KPA500, and I have one of those on the desk, some form of
keying and timing will be required such that the amp is keyed first and then
the Omni VII Plus is keyed. This of course will cause a delay of some small
amount in your keying. That may be operational problematic depending on the
amount of delay and would not likely be satisfactory in operating QSK.
There is a short delay of about 10 milliseconds which does occur on the Control
Board. See page 4-16, paragraph 3, in the manual. This delay is available on
the keying loop. Personally, I would carefully measure the timing from key
closure to RF generation to make sure the 10 ms is indeed present. If so that
is most likely adequate to switch the KPA500. Even so, some interface
switching arrangement is needed.
A friend of mine is using an external keyer which does provide keying output
for the amplifier and adjustable delayed output to key the radio. I think it
is an old MFJ product. Even then, he removed the internal relay and
converted the circuit to a open collector circuit.
I suggest buying a Tentec amp, Centurion or Titian, and be done with it.
73
Bob, K4TAX
On 3/26/2020 9:54 PM, Barry Simpson wrote:
> After a two year search, I have finally acquired a very nice Omni Vl Plus.
>
> I would like to know if anyone has designed/undertaken a modification
> to eliminate the slow noisy amplifier relay to allow solid state QSK
> switching of an external amplifier.
>
> I know that the Omni has the keying in/out function that fulfils the
> keying role with Ten Tec and other amplifiers with the same keying
> in/out circuitry. However, I want to control an Elecraft KPA500 which
> does not have the in/out function.
>
> I look forward to any responses.
>
> Regards and 73 to all at this difficult time.
>
> Barry Simpson VK2BJ
> _______________________________________________
> TenTec mailing list
> TenTec@contesting.com
> http://lists.contesting.com/mailman/listinfo/tentec
>
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