[TenTec] Omni vi+ and Alpha 87A

[Troy Wideman]

John and the group,
 I use my Omni VI+ ( option 3 version) with an Alpha 89 which essentially
has the same protection circuitry as the 87A. I don't have any problems
either on CW or phone. It will "fault out" if there is a problem anywhere in
the antenna system ( which has happened). However, as long as the antenna
system doesn't have a problem, the amp will work FB.
73,
Troy, W6HV
----- Original Message -----
From: "John, ke5c" <ke5c@hot.rr.com>
To: "Ten-Tec Reflector" <tentec@contesting.com>
Cc: "George, K5TR" <geoiii@loja.kkn.net>; "Tom, N5TW" <n5tw@igg-tx.net>
Sent: Sunday, July 15, 2001 12:32 PM
Subject: [TenTec] Omni vi+ and Alpha 87A


>
> Last weekend my friend unplugged the cables from his FT1000D, removed it,
> set my Omni vi+ into the same physical space, and reconnected the cables.
> We determined the drive level which made his Alpha 87A happy.  (Jay, that
> plus a three antenna stack of 15 total elements is why I was loud on the
net
> last week.)  He used the Omni and Alpha several times during the week, but
> early on during IARU, I kept tripping the 87A out.  I reduced drive to get
> about 1000W out instead of 1500W, and had the same *intermittent* problem.
> I would make several QSO's without difficulty, not change the band or
> antenna direction, and suddenly the 87A would trip out.  I soon noticed
that
> the forward and reflected power on the 87A jumped just as it kicked out.
> Thinking maybe there was a loose connnection in the antenna system, I
> changed from 40M to 15M with the same result.  We uninstalled the Omni and
> put his FT1000D back in place, and I operated the next 12 hours without
> difficultly.
>
> Another interpretation of the forward and reflected power surging would be
> slow or poor ALC performance allowing a spike in the drive to the 87A
> transiently harder.  Does anyone have any experience with the Omni vi+ or
> perhaps just generically with TenTec power amps and ALC driving an 87A
which
> is just loaded with protection circuitry?
>
> 73, John
> P.S. the FT1000D is a fine rig, I just wanted to operate with my own rig
for
> psychologic reasons, so no comparisons please.
>
>
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