[1000mp] What is Wrong with SWR Meter?

Tue, 4 Jun 2002 18:40:35 -0500

----- Original Message -----
From: "Pawel, SP7PS" <[email protected]>
To: <[email protected]>
Sent: Tuesday, June 04, 2002 6:01 PM
Subject: Re: [1000mp] What is Wrong with SWR Meter?

> Steve,
> you are not right. Maybe they are two different animals, but explain me
> please, why yesterday I could work 100 Watts and SWR on internal meter was
> right 1:1 and today it is 1:2 without auto tuner and 1:1.5 with it and
power
> is reduced to 70 Watts?

Ask yourself what has changed in your station in this time. Tuner off or on,
tuner settings, band of operation, rain, antenna changed, etc.

I checked with 50 Ohm Dummy Load and it is the same:
> reduced power, high SWR and high ALC reading.

 High swr on a dummy load means about one of three things--a bad dummy load
[unlikely], a bad coax jumper, or the tuner being on in the mp [and set for
other than 50 ohms--a higher swr antenna].

 The low power is caused by
> inproper ALC..... Do you agree?

No. I doubt swr sensing directly uses alc. It might use alc to turn the
power down after the high swr was detected. Saying the alc is responsible
for the power being low is ignoring what swr protection does.

 As I know, ALC is first line of defence,
> when it is something wrong with amplifier it reduce power from
transceiver.

Alc doesn't know anything about swr. It sees over-drive not swr.

> I have checked it with CW tuning and FSK keying.

I think someone suggested a tuner reset. I would also suggest doing that.
Then hook the antenna up directly to the mp and see what you get with and
without the tuner.
         Also, when you report back, please include frequency, mode, coax
type, antenna, any external tuners or meters, and anything else you can
think of. It is hard to troubleshoot without all the information.

> Pawel

73
Steve
>
> ----- Original Message -----
> From: "Steve M" <[email protected]>
> To: <[email protected]>
> Sent: Tuesday, June 04, 2002 10:39 PM
> Subject: Re: [1000mp] What is Wrong with SWR Meter?
>
>
> > Now you are talking about ALC. Earlier you were talking about SWR. ALC
and
> > SWR are two different animals.Which is it? Is this key down cw, ssb, am,
> fm
> > or what? The alc reading has nothing to do with key down cw power with
no
> > alc line from an amp hooked up.
> >     In key down cw I think the alc meter should read high with a good
> > antenna.
> >          Read the manual and decide if you are talking about swr or alc.
> >
> > Steve  wd0ct
> >
> > ----- Original Message -----
> > From: "Pawel, SP7PS" <[email protected]>
> > To: <[email protected]>
> > Sent: Tuesday, June 04, 2002 1:15 PM
> > Subject: Re: [1000mp] What is Wrong with SWR Meter?
> >
> >
> > > Thanks for the suggestion, but it still doesn't work.
> > > I found, that the power is reduced because of high ALC reading. I have
> no
> > > amplifier connected nor ALC used.
> > > Why the transceiver shows high ALC with good antenna?
> > >
> > > Pawel
> > >
> > >
> > > ----- Original Message -----
> > > From: "Steve M" <[email protected]>
> > > To: <[email protected]>
> > > Sent: Tuesday, June 04, 2002 5:43 PM
> > > Subject: Re: [1000mp] What is Wrong with SWR Meter?
> > >
> > >
> > > > Pawel,
> > > >
> > > > When there is some swr on the line the impedance will change with
line
> > > > length. Meters at different points in the line may read diferent
even
> > > > though swr doesn't change with line length. Many meters will say
that
> it
> > > > does change with length.
> > > >         If you are using an outboard tuner, adjust it so the MP
meter
> > > shows
> > > > the most output power. There also should be a low swr reading at the
> MP
> > > with
> > > > this adjustment. Disregard other swr meters down the line.  If you
are
> > not
> > > > using an outboard tuner you can add jumpers to the line until the MP
> is
> > > > happy with the impedance it is seeing. If all this is confusing then
> > just
> > > > use the tuner in the MP.
> > > >
> > > > 73
> > > > Steve  wd0ct
> > > >
> > > > ----- Original Message -----
> > > > From: "Pawel, SP7PS" <[email protected]>
> > > > To: "FT-1000MP Reflector" <[email protected]>
> > > > Sent: Tuesday, June 04, 2002 10:57 AM
> > > > Subject: [1000mp] What is Wrong with SWR Meter?
> > > >
> > > >
> > > > > Hello MP Users,
> > > > >
> > > > > Would you please to help me with the following problem: my
> FT-1000MP's
> > > SWR
> > > > > meter shows 1:2, but external SWR & Power Meter shows perfect
match
> of
> > > the
> > > > > antenna 1:1 - no reflected power... It is on all bands, sometimes
MP
> > > shows
> > > > > SWR 1:3 while external meter tells it is 1:1.5 (on other antenna).
> > > > > What is wrong with the transceiver? It also shows about 70 Watts
> > output
> > > > > though external power meter shows 100 Watts....
> > > > >
> > > > > Should I try to adjust any settings to make SWR meter work right?
> > > > >
> > > > > Awaiting your suggestions.
> > > > > Best 73's
> > > > > Pawel, SP7PS
> > > > > SN7N in contests
> > > > >
> > > > >
> > > > >
> > > > >
> > > > > _______________________________________________
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> > > >
> > >
> > >
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> >
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>
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