I have used an LDG AT-11MP tuner to match a Carolina Windom 160 antenna to
an Omni V. If I don't remember to reduce the power before putting the radio
in TUNE mode and activating the tuner, the Omni almost always shuts down on
overcurrent during the tuning. However, if I reduce the power for the tune,
the AT-11MP always finds a good match and everything is fine.
Mark
----- Original Message -----
From: "Steve Ellington" <n4lq@iglou.com>
To: <tentec@contesting.com>
Sent: Wednesday, January 09, 2002 17:30 PM
Subject: Re: [TenTec] re: pegasus internal tuner
> These are all good points an I might add the following:
> A 2:1 swr could mean either the rig is seeing a 100 ohm load or a 25 ohm
> load. It's those low impedance loads that tend to drawl excessive current.
> Be careful when operating with a short antenna. For example, using an 80
> meter dipole on 160 meters or a short mobile antennas can show what
appears
> to be a decent swr while jerking huge amounts of collector current.
> TT rigs do have rugged final amps and so far, knock on kenwood, I haven't
> blown one, even without a circuit breaker in line, but be sure to adjust
the
> tuner with the lowest power possible then crank it up after obtaining a
> match.
> Other make rigs have "foldback circuits" which reduce final power
> automatically when presented with a mismatch. This has probably saved many
> finals from loosing all their smoke. I smoked the coils in a TS-940's
tuner
> once when trying to match the aforementioned antenna!
> Steve Ellington
> N4LQ
>
> _______________________________________________
> TenTec mailing list
> TenTec@contesting.com
> http://lists.contesting.com/mailman/listinfo/tentec
>
|