[1000mp] Different SWR at SSB and CW

[Sergey]

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/