[1000mp] Different SWR at SSB and CW
Sergey
a1sy at yahoo.com
Tue Jun 8 01:03:25 EDT 2004
Hi Art
Well it's not a silly question.
I have a Heil Pro-set plus and checking my SSB by loud "AaaaaOOOOO" and so on...
73,Sergey
KO5D
--- Art Searle W2NRA <w2nra at birdsandbeacons.com> wrote:
> 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
> >
>
>
> _______________________________________________
> 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/
More information about the 1000mp
mailing list