[TenTec] Transmit not stopping when PTT is released

[Carl Moreschi]

The Orion brings up the amp key line 15 msec before transmit comes on.
The real test is lower the power output to minimum.  If this fixes it 
then RFI is the problem.

Carl Moreschi N4PY
58 Hogwood Rd
Louisburg, NC 27549
www.n4py.com

On 12/5/2013 9:28 PM, Bob McGraw - K4TAX wrote:
> 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
>
>
>
>
> ----- Original Message ----- From: "Barry N1EU" <barry.n1eu at gmail.com>
> To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>
> Sent: Thursday, December 05, 2013 6:56 PM
> Subject: Re: [TenTec] Transmit not stopping when PTT is released
>
>
>> Kim, you might be right - Rod's qrz page indicates a 1960's amplifier.
>>
>>
>> On Fri, Dec 6, 2013 at 12:51 AM, Kim Elmore
>> <cw_de_n5op at sbcglobal.net>wrote:
>>
>>> Depends on how it's set up, but a long delay between keying and
>>> application of RF drive, along with a delay between the cessation of RF
>>> drive and unkeying the amp is needed to give the typical open-frame
>>> relay
>>> time to switch.
>>>
>>> Kim N5OP
>>>
>>> "People that make music together cannot be enemies, at least as long as
>>> the music lasts." -- Paul Hindemith
>>>
>>> On Dec 5, 2013, at 18:44, Barry N1EU <barry.n1eu at gmail.com> wrote:
>>>
>>> > Why would there be hot switching if the Orion is keying the amp?
>>> >
>>> >
>>> > On Fri, Dec 6, 2013 at 12:42 AM, Kim Elmore <cw_de_n5op at sbcglobal.net
>>> >wrote:
>>> >
>>> >> Unless the amp is QSK capable or he sets the OII to behave as semi
>>> >> QSK,
>>> >> he'll almost certainly suffer hot switching of the T/R relay. Very
>>> >> bad.
>>> >>
>>> >> Kim N5OP
>>> >>
>>> >> "People that make music together cannot be enemies, at least as
>>> long >> as
>>> >> the music lasts." -- Paul Hindemith
>>> >>
>>> >> On Dec 5, 2013, at 17:57, Richards <jrichards at k8jhr.com> wrote:
>>> >>
>>> >>> Golly, Rod... I am no expert... but I will take a stab at it.
>>> >>>
>>> >>> Are you sure you have the amp cable routed correctly?
>>> >>>
>>> >>> My "intuition" (i.e. my gut) says you might consider routing
>>> >>> the amp key line from the rig to the amp, and just keying
>>> >>> the rig with the microkeyer device - as if it were just a code
>>> >>> key or PTT switch.n That way, the keyer cues the rig, and the
>>> >>> rig cues the amp.
>>> >>>
>>> >>> Just a thought...
>>> >>>
>>> >>> ------------------------------- >>> K8JHR
>>> ------------------------------
>>> >>>
>>> >>> Rod Greene wrote:
>>> >>>> I just installed a new to me microKeyer II. ....
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