I have a similar problem using OMNI 6 plus and an Alpha 89. Noticeable on
SSB as but at times on FSK RTTY and CW. No cure found.
Dave W7DPW
At 02:32 PM 7/15/01 -0500, John, ke5c wrote:
>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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