[TenTec] TT Orion: Also SEMI-BK-IN possible ?

[Bob Henderson]

Carl

The computer knows exactly when the last character element of an 
exchange has been sent and can reliquish PTT at exactly that moment.  No 
delay.  Using semi BK-in the delay you set has to be long enough to be 
sure you have sent that last character element before you revert to RX.  
Working at high speed this extra delay causes problems.

Bob, 5B4AGN, P3F

Carl Moreschi wrote:

>The Orion "Amp Key" line will go to ground about 20 milliseconds before the
>Orion actually transmits a signal.  It will then stay ground for up to a one
>second delay after transmit finishes.  This delay is adjustable from 0 to 1
>second.   It seems to me that this line provides all the timing that is
>necessary to key external equipment and protect it from a transmit signal.
>Am I missing something?
>
>There is also a variable QSK delay you can independently adjust for  how
>long it takes the receiver to come back on after transmit is finished.  This
>delay is also adjustable from 0 to 1 second.
>
>Carl Moreschi N4PY
>Franklinton, NC
>----- Original Message -----
>From: <K3BU at aol.com>
>To: <tentec at contesting.com>
>Sent: Saturday, December 27, 2003 11:40 PM
>Subject: Re: [TenTec] TT Orion: Also SEMI-BK-IN possible ?
>
>
>  
>
>>In a message dated 12/27/03 6:18:13 PM Eastern Standard Time,
>>dh0ghu at dh0ghu.de writes:
>>    
>>
>>>>Of course I agree with Jack that on HF, QSK is an abolute must for
>>>>        
>>>>
>>reliable operation. It has nothing to do with PTT: Be sure, I'll not use
>>a PTT for CW contesting, I only have two hands, one for the PC, one for
>>the keyer, that's all...)<<
>>
>>If I understand, you seem to consider PTT to be Phoot To Talk.  PTT line
>>    
>>
>is
>  
>
>>used by computer to switch system from receive to transmit and vice versa.
>>    
>>
>With
>  
>
>>bunch of equipment like amplifiers and switching systems for radios and
>>antennas, precise control of PTT signal timing allows to fine tune the
>>    
>>
>system,
>  
>
>>eliminate hot switching, millions of unnecessary cyclings and unnecessary
>>    
>>
>delays
>  
>
>>as experienced with semi-BK. We do not use PTT for foot switch type
>>    
>>
>control by
>  
>
>>real feet.
>>
>>Yuri, K3BU
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>>    
>>
>
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>  
>