[1000mp] Different SWR at SSB and CW
Art Searle W2NRA
w2nra at birdsandbeacons.com
Mon Jun 7 21:31:14 EDT 2004
Please excuse the silly question, I don't operate
the mode. How does one check SWR in SSB? Whistle
into the mic?
73,
Art
W2NRA
----- Original Message -----
From: "Sergey" <a1sy at yahoo.com>
To: "All about Yaesu 1000mp"
<1000mp at mailman.qth.net>
Sent: Monday, June 07, 2004 8:05 PM
Subject: Re: [1000mp] Different SWR at SSB and CW
> Mike
> In experiment I did yesterday I connect my TRCVR
to the dummy load.
> I measure my SWR with TRCVR meter and in the
output of TRCVR I have a Daiwa SWR meter.
> Daiwa was connected to the 50 Ohm 200 Watts
dummy load.
> I undestand that some people saing go ahead and
just enjoy to be in the air.
> I think I have some problem with My SWR reading.
> The facts:
> 1.Doesn't metter if Tuner is ON or OFF - results
are the same.SSB SWR higher than CW for 0.5-0.7.
> 2.Test done on 50 Ohm dummy load,so I exclude
any influance of antenna.
> 3.I think it doesn't make sence to have
different SWR on the same Frequency.
>
> So,I seriously thinking to send it to Yaesu.
> I don't think it a good idea to work on SSB and
to see SWR around 2 and to verify every time that
> "I still have an antenna" by swithching to CW.
> I wrote this message to the forum to ask if
anybody else had the same issue and what was the
> solution.And bisides I wanted to hear more
opinions on that issue from others.
> Thanks,Sergey
> KO5D
> --- Mike Schatzberg
<cherokeehillfarm at earthlink.net> wrote:
> > Hello Sergey:
> >
> > Okay, interesting data. So, what is the SWR
at the coax connector that is
> > plugged into the SO 259 on the back of the
Mark V?
> >
> > Are you measuring the SWR externally after a
linear amplifier?
> >
> > If you are feeding your amplifier from your
Mark V, you should have a very
> > low SWR at the input to the amplifier. In
fact, you should not need to even
> > use the tuner at all, in this case. An
interconnecting cable between the
> > two units may be a problem.
> >
> > Reset your memories one more time, and use the
CW method to force the tuner
> > to achieve as close to 1:1 as possible.
> >
> > Clearly your Mark V thinks the SWR is high on
SSB, and is reducing the power
> > output accordingly, but will not reduce it on
CW at all, when the match is
> > 1:1.2 or less....
> >
> > If one more forced tuning does not solve the
problem, lower the overall SWR
> > of the antenna system as much as possible. Go
to 15 meters, and measure the
> > SWR of your antenna system, at the desired
frequency, and then carefully
> > start pruning back the coax, perhaps 6 inches
at a time, and re-evaluate the
> > SWR. While pruning, you can hold the coax
braid to the SO 259 connector
> > with a clothespin, to make contact.
> >
> > Reducing the overall SWR, prior to making the
tuner tune the system, should
> > help the overall situation.
> >
> > Finally, prior to doing any of this, check all
your jumper cables, and even
> > your antenna cable, into a dummy load, and
make sure they all read as close
> > to 1:1 as possible. You may have a bad cable
in your antenna system causing
> > you problems. A dummy load is a good
investment for trouble shooting, and
> > the Mark V should show 200 watts on all bands,
CW and SSB into the dummy
> > load with a good piece of coax, or a double
male connector.
> >
> > When you are sure that the rig is working into
the dummy load, begin the
> > pruning operation.
> >
> > Good luck and happy DXing,
> >
> > Mike
> > WB2AJI
> >
> >
> > ----- Original Message -----
> > From: "Sergey" <a1sy at yahoo.com>
> > To: "All about Yaesu 1000mp"
<1000mp at mailman.qth.net>
> > Sent: Sunday, June 06, 2004 11:38 PM
> > Subject: Re: [1000mp] Different SWR at SSB and
CW
> >
> >
> > > Thanks Mike
> > > Here is another test i run today:
> > > Freq Mode Internal SWR Extenal SWR
Internal P meter External P
> > meter(PEP)
> > > 7100 CW 1 1.1
200 200
> > > 7100 SSB 1.7 1
200 100
> > > 14160 CW 1.2 1.2
200 200
> > > 14160 SSB 1.6 1.1
200 120
> > > 21207 CW 1.3 1.2
200 160
> > > 21207 SSB 1.7 1
200 85
> > >
> > > It looks like a Power has a different
reading as well.Not sure TRCVR read
> > PEP or AVG.In AVG it
> > > would read actually less.
> > > I made this test on 50 Ohm load and confused
with results.
> > > Not sure it's normal.I talked to my friend
that has a 1000MP Field and he
> > has a difference in
> > > about 0.1 between SWR and CW.
> > > Even that's OK,it's a little bit bother me
when I use SSB.Not sure I saw
> > it before.
> > > Thanks,Sergey
> > > KO5D
> > >
> > > --- Mike Schatzberg
<cherokeehillfarm at earthlink.net> wrote:
> > > > Hello Sergey:
> > > >
> > > > I do not pay any attention to the SSB SWR
really. When I find the
> > frequency
> > > > I wish to adjust the tuner on, I do it in
CW mode. I like to send a
> > series
> > > > of DITS at about 30 wpm, and then push and
hold the tuner button, to
> > force
> > > > the tuner to retune, and to memorize the
setting. This can be done at
> > > > relatively lower power, say about 30
watts.
> > > >
> > > > I find that even with s 1:1 SWR in CW
mode, the SWR meter while in SSB
> > still
> > > > reads upscale somewhat, for whatever
reason. The SWR reading in CW
> > agrees
> > > > with my Autek Research WM-1, and therefore
appears to be accurate.
> > > >
> > > > I just ignore the SSB reading. Of course,
if your Mark V decreases your
> > > > power output, after getting a perfect
match in CW, while transmitting on
> > > > SSB, you would have another issue. But I
never have seen this situation
> > > > occur, the radio always transmits with
full power capability after
> > adjusting
> > > > the tuner in this manner.
> > > >
> > > > Good luck and happy DXing,
> > > >
> > > > Mike
> > > > WB2AJI
> > > > ----- Original Message -----
> > > > From: <Sergey_Abrikosov at amat.com>
> > > > To: <1000mp at mailman.qth.net>
> > > > Sent: Sunday, June 06, 2004 5:38 PM
> > > > Subject: [1000mp] Different SWR at SSB and
CW
> > > >
> > > >
> > > > > Last week I found a higher than usual
SWR on 14MHZ during some
> > pile-up.
> > > > > The SWR was around 1.6 with some peaks
to 1.8.
> > > > > I use a dipole and thought that
something happened to my antena,but
> > after
> > > > > several experiments I found that I have
1.2 SWR on the same frequency
> > in
> > > > CW
> > > > > mode.
> > > > > So,I tried 7,14,28 MHZ and had the same
issue: 1.1.-1.2 on CW and
> > 1.6-1.7
> > > > > on SSB on the same frequency.
> > > > > I tried to retune again my tuner but no
change in SWR so far.
> > > > > I did reset all memories and it didn't
help either.
> > > > > Did anybody had the same issue?
> > > > > Thanks,Sergey
> > > > > KO5D
> > > > >
> > > > > The content of this message is Applied
Materials Confidential. If you
> > are
> > > > > not the intended recipient and have
received this message in error,
> > any
> > > > use
> > > > > or distribution is prohibited. Please
notify me immediately by reply
> > > > > e-mail and delete this message from your
computer system. Thank you.
> > > > >
> > > > >
> > > > >
> > > > >
_______________________________________________
> > > > > 1000mp mailing list
> > > > > 1000mp at mailman.qth.net
> > > > >
http://mailman.qth.net/mailman/listinfo/1000mp
> > > >
> > > >
_______________________________________________
> > > > 1000mp mailing list
> > > > 1000mp at mailman.qth.net
> > > >
http://mailman.qth.net/mailman/listinfo/1000mp
> > >
> > >
> > >
> > >
> > >
> > > __________________________________
> > > Do you Yahoo!?
> > > Friends. Fun. Try the all-new Yahoo!
Messenger.
> > > http://messenger.yahoo.com/
> > >
_______________________________________________
> > > 1000mp mailing list
> > > 1000mp at mailman.qth.net
> > >
http://mailman.qth.net/mailman/listinfo/1000mp
> >
> >
_______________________________________________
> > 1000mp mailing list
> > 1000mp at mailman.qth.net
> > http://mailman.qth.net/mailman/listinfo/1000mp
>
>
>
>
>
> __________________________________
> Do you Yahoo!?
> Friends. Fun. Try the all-new Yahoo!
Messenger.
> http://messenger.yahoo.com/
> _______________________________________________
> 1000mp mailing list
> 1000mp at mailman.qth.net
> http://mailman.qth.net/mailman/listinfo/1000mp
>
More information about the 1000mp
mailing list