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Re: [TenTec] Help please , Orion with Alpha 91B

To: tentec@contesting.com
Subject: Re: [TenTec] Help please , Orion with Alpha 91B
From: Bob Henderson <bob@cytanet.com.cy>
Reply-to: tentec@contesting.com
Date: Mon, 24 May 2004 20:40:37 +0000
List-post: <mailto:tentec@contesting.com>
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@cytanet.com.cy>
To: <tentec@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@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
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