Barry Mung

To use a swr meter correctly,it should be AFTER the burner,ie before the
aerial and NOT between the rig and the burner.
Most burners will give a 1.1 swr reading to the rig,not giving you a true
reading of the aerial,unless it is switched off.
Many people have done this and blown up much larger burners than I can
imagine.

Heres what you should have:

[RIG]---[BURNER]----[SWR METER]-----------Y
I
AERIAL
[12v]

Some old burners had a tuning screw underneath or inside,but new ones don't
seem to have that anymore.

Have fun!

Road_Hog®

"Barry Mung" <wildlife_video@NOSPAMbreathe.com> wrote in message
news:421388b6$1_3@mk-nntp-1.news.uk.worldonline.com...
> To use a swr meter correctly,it should be AFTER the burner,ie before the
> aerial and NOT between the rig and the burner.
> Most burners will give a 1.1 swr reading to the rig,not giving you a true
> reading of the aerial,unless it is switched off.
> Many people have done this and blown up much larger burners than I can
> imagine.
>
> Heres what you should have:
>
> [RIG]---[BURNER]----[SWR METER]-----------Y
> I AERIAL
> [12v]
>

Not sure having the aerial between the power supply and the RIG sounds like
a good idea ;->

mikeFNB

wrong.

read your transmission line theory again.

mike


"Barry Mung" <wildlife_video@NOSPAMbreathe.com> wrote in message
news:421388b6$1_3@mk-nntp-1.news.uk.worldonline.com...
> To use a swr meter correctly,it should be AFTER the burner,ie before the
> aerial and NOT between the rig and the burner.
> Most burners will give a 1.1 swr reading to the rig,not giving you a true
> reading of the aerial,unless it is switched off.
> Many people have done this and blown up much larger burners than I can
> imagine.
>
> Heres what you should have:
>
> [RIG]---[BURNER]----[SWR METER]-----------Y
> I
> AERIAL
> [12v]
>
> Some old burners had a tuning screw underneath or inside,but new ones
don't
> seem to have that anymore.
>
> Have fun!
>
>

Philip de Cadenet

>read your transmission line theory again.

The way I'd do this is first tune the antenna to resonance with the
amplifier and with, preferably an external VSWR bridge. They tend to be
somewhat more reliable and accurate than anything built into a rig.

Then, I'd run the rig, driving the VSWR bridge to the input of the amp
into a power meter and 50 ohm non-inductive load (dummyload).

Then, you or the local tech can adjust any input tuning the amp may have
to tune for minimum VSWR (or best match into the amp. If it halfway
decent it will want to see a 50 ohm match, the VSWR should be low or
even zero.

Once you have tuned the amp's input you can then do away with the input
metering.

Then, with rig driving the amp you can tune the amp for max smoke (not
literally) into a power meter connected to the dummyload.

I haven't drunk enough coffee yet this morning but that's just my 2p.

If you're anywhere near London and still need help, pop in, as I have
access to good quality test equipment here.

Sunday's the only day you can park free in Kensington & Chelsea.
--
Philip de Cadenet G4ZOW
Transmitters 'R' Us
http://www.transmittersrus.com

Philip de Cadenet

>The way I'd do this is first tune the antenna to resonance with the
>amplifier and with, preferably an external VSWR bridge. They tend to be
>somewhat more reliable and accurate than anything built into a rig.
__________________________________________________ ___

I meant to say tune the antenna 'without' the amp in line.

I told you I hadn't had enough coffee this morning.
--
Philip de Cadenet
Transmitters 'R' Us
http://www.transmittersrus.com

J

What do you want to measure, the SWR into the burner or the SWR in to the
aerial ?


"mikeFNB" <moc.dlrowltn@FNB7G-ekim> wrote in message
news:leQQd.1530$8n6.1236@newsfe3-win.ntli.net...
> wrong.
>
> read your transmission line theory again.
>
> mike
>
>
> "Barry Mung" <wildlife_video@NOSPAMbreathe.com> wrote in message
> news:421388b6$1_3@mk-nntp-1.news.uk.worldonline.com...
> > To use a swr meter correctly,it should be AFTER the burner,ie before the
> > aerial and NOT between the rig and the burner.
> > Most burners will give a 1.1 swr reading to the rig,not giving you a
true
> > reading of the aerial,unless it is switched off.
> > Many people have done this and blown up much larger burners than I can
> > imagine.
> >
> > Heres what you should have:
> >
> > [RIG]---[BURNER]----[SWR METER]-----------Y
> > I
> > AERIAL
> > [12v]
> >
> > Some old burners had a tuning screw underneath or inside,but new ones
> don't
> > seem to have that anymore.
> >
> > Have fun!
> >
> >
>
>