[Kenwood] Kenwood sw-2100 give some swr !!?? (coorection, sorry)

[Allan]

Hi Steve, John and all,

Thanks for your replies.

Shack radio equipment : Transceiver kenwood ts-850sat, amplifier TL-922,
swr/power-meter Sw-2100 and antenna cubical quad monoband 3 elts 11 meter,
direct attack system .

I'm sure that the problem come from the sw-2100. 

In this cas : ANT-Sw2100-Amplifier-TX
I read swr 1.1 on Sw2100 and swr 1.5 on transceiver's swr-meter. But my
amplifier push only about one half of his power. So this is not a problem
from my antenna and from the coaxial line.

In this cas : ANT-Amplifier-Sw2100-TX
I read swr 1.1 on Sw2100 and swr 1.5 on transceiver's swr-meter. But here my
amplifier push 100% of his power.

In this cas : ANT-Amplifier-TX
I read swr 1.1 on transceiver's swr-meter and my amplifier push 100 % of his
power.Sorry I don't have a dummy load. 
If I have a problem with the antenna, swr-meter's transceiver will indicate
swr 1.5 too ??

If I made all the tests with only 100 watts ( from transceiver ) the problem
is totally the same. 
During differents test, I don't need to turn plate or load knob for having
the maximum power.

For summarizing :  Swr before sw-2100 is 1.1 and after sw-2100 is 1.5 ( in
all cases ) 

That's a strange problem ...

Thanks

Regards

Allan

> -----Message d'origine-----
> De : Steve McDonald [mailto:jsm at gulfislands.com] 
> Envoyé : mardi 19 décembre 2006 02:29
> À : Allan
> Objet : Re: [Kenwood] Kenwood sw-2100 give some swr !!?? 
> (coorection, sorry)
> 
> 
> Allan - swr meters are always more accurate when used at low 
> power levels.
> From what I can tell, the swr of 1.5 is likely the true swr 
> on the coaxial/antenna line system while the 1.1 swr is the 
> actual swr on the line between the trcvr and the amplifier 
> input circuit.
> 
> I suspect that the output power from the amplifier is still 2 
> kw pep even in test #1 even though the meter is saying 
> otherwise. In test #1, is the Plate Current the same as in 
> Test #2 and #3 or is it different?
> 
> The output power, using your swr/power meter can only be 
> accurately measured if the amplifier is feeding a 50 ohm 
> dummy load and not a reactive antenna system with swr.
> 
> Steve / VE7SL / 73
> 
> Web: "THE VE7SL RADIO NOTEBOOK" at   http://www.imagenisp.ca/jsm
> 
> >
> > Hi all,
> >
> > I use a kenwood ts-850sat, a TL-922 and a sw-2100.
> >
> > The problem is that the kenwood sw-2100 ( swr and power 
> meter ) give a 
> > swr of 1.5 to my coaxial line.
> >
> > This is some tests I made :
> >
> > 1) The swr-meter is connecting directly to the antenna and 
> go to the 
> > amplifier.
> > I see a swr of 1.5 on the swr meter's transceiver and the power's
> amplifier
> > is about 1kw pep instead of 2 kw pep ( see on rf meter's amplifier)
> >
> > 2) If I connect it between transceiver and amplifier, I see 
> swr 1.1 on 
> > sw-2100 and swr 1.5 on swr meter's transceiver and the power's 
> > amplifier
> is
> > 2 kw pep.
> >
> > 3) If I switch off the sw-2100, swr is 1.1 on swr's meter 
> transceiver 
> > and power's amplifier is 2 kw pep.
> >
> > Coaxial line for connecting all equipment together measure 
> 1 meter ( 
> > 39.37 inches ).
> >
> > Do you have some councils  to solve this problem?
> >
> > Many thanks
> >
> > Regards
> >
> > Allan
> >
> >
> >
> >
> >
> >
> >
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