[TenTec] Transmit not stopping when PTT is released

[Rick - DJ0IP / NJ0IP]

"And that's all I have to say about that."

Oops... made one mistake.
I do have more to say:

The Winkeyer II has a built in Winkey (K1EL), which can be keyed by a
software (i.e. N1MM), or an external Paddle.
So where I said "external keyer" connecting to the Winkeyer, I meant
"Paddle".  

To be on the safe side, I'll say "I think that's all I have to say about
that".

73
Rick, DJ0IP


-----Original Message-----
From: TenTec [mailto:tentec-bounces at contesting.com] On Behalf Of Bob McGraw
- K4TAX
Sent: Friday, December 06, 2013 3:28 AM
To: Discussion of Ten-Tec Equipment
Subject: Re: [TenTec] Transmit not stopping when PTT is released

In most cases with a non-QSK amp some form of delay system should be
employed.  This system provides a delay at initiation of transmit such that
amp relays close and settle before RF is applied.  Then at the end, a delay
to hold the relays closed until the completion of the last character.  At
end when the CW key is released the character must still be sent.  If the
radio is using the CW key for control of the TX/RX control then likely the
amp could un-key before completion of the RF envelope.  Thus hot switching
may occur.

I don't recall the timing sequence of the Orion II.

With the Tentec QSK circuit the key is closed and this sends the signal to
the amp to switch from RX to TX mode. After the amp has switched it then
sends a signal back to the transceiver to deliver the RF.  At the end of the
transmission, the RF sensing circuit in the Centurion and Titan keep the
relays in the amp engaged until the end of the RF envelope before the relays
are allow to switch from TX back to RX.


73
Bob, K4TAX



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