[TenTec] Help please , Orion with Alpha 91B

[Bob Henderson]

Dave

What Ten Tec suggests for the Omni VI+ is not good!  Here's why.......

The T/R switching in the 87A is very fast.  It is pin diode switching 
not mechanical relays.  The T/R switching on the VI+ was timed for a 
mechanical vac relay.  TX out from the VI+ drops before the completion 
of a character element.  If there is a mechanical delay in the amp that 
matches this delay then no problem.  However, the 87A is fast and clips 
character elements in QSK which produces horrible clicks and truncated 
elements.  When I use my VI+ QSK I have to use a pulse extender on the 
TX line interface to the 87A to avoid the problem.  The Orion works fine 
just connecting Amp key 1 on the Orion to Relay on the 87A.

73  Bob, 5B4AGN, P3F


Dave W7DPW wrote:

>Here's what AlphaPower says. You might want to investigate..
>
>http://www.alpha-amps.com/html/ampkey.htm
>
>and for the OMNI  VI plus:
>
>http://www.alpha-amps.com/html/tentec.htm
>
>Dave W7DPW
>
>
>----- Original Message ----- 
>From: "Bob Henderson" <bob at cytanet.com.cy>
>To: <tentec at contesting.com>
>Sent: Monday, May 24, 2004 12:57 PM
>Subject: Re: [TenTec] Help please , Orion with Alpha 91B
>
>
>  
>
>>Pete
>>
>>I'm flumoxed by your comment on the 87A.  The 87A is as fast a QSK
>>    
>>
>amp
>  
>
>>as I've ever seen.  It's awful with Ten Tec loop keying, because it
>>switches too fast for it.  My 87A with my Orion is good to better
>>    
>>
>than
>  
>
>>100wpm, not that I send that fast.  When loop keyed it clips the
>>tail-end of character elements and is awful even at 18wpm.  Doesn't
>>    
>>
>the
>  
>
>>Titan still use a vacuum relay, which is why it needs loop keying in
>>    
>>
>the
>  
>
>>first place.
>>
>>Bob, 5B4AGN, P3F
>>
>>
>>ac5e at comcast.net wrote:
>>
>>    
>>
>>>Hi Lee; I suspect it will depends bit on just how fast you operate.
>>>      
>>>
>If the 91's keying is as fast as the 87A you won't have much if any
>degredation in the QSK. Of course, I could tell the difference when I
>sent an exchange to  some of the 40+ DX stations, but for normal
>keying up to 30 WPM the 87A is as good as the Titan that lives on the
>shelf below it.
>  
>
>>>73  Pete Allen  AC5E
>>>
>>>--
>>>Never squat with your spurs on
>>>
>>>
>>>
>>>
>>>      
>>>
>>>>Hello gang,
>>>>
>>>>I have an Orion currently using it with a TT Centaur. Works well
>>>>        
>>>>
>full QSK.
>  
>
>>>>I have an opportunity to get an Alpha 91B for a good price.
>>>>
>>>>Looking at the Alpha I see it does nor suppport the full keying
>>>>        
>>>>
>loop like the
>  
>
>>>>TT amps.
>>>>So, what do I need to do to hook the Orion to the Alpha for full
>>>>        
>>>>
>QSK?
>  
>
>>>>Any less function than a TT amp?
>>>>
>>>>Thanks,
>>>>Lee, KC9CDT
>>>>_______________________________________________
>>>>TenTec mailing list
>>>>TenTec at contesting.com
>>>>http://lists.contesting.com/mailman/listinfo/tentec
>>>>
>>>>
>>>>        
>>>>
>>>_______________________________________________
>>>TenTec mailing list
>>>TenTec at contesting.com
>>>http://lists.contesting.com/mailman/listinfo/tentec
>>>
>>>
>>>
>>>      
>>>
>>
>>_______________________________________________
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>>TenTec at contesting.com
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>>    
>>
>
>
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>  
>