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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