[1000mp] Strange bahaviour on 80 meters

Sat, 27 Dec 2003 10:46:51 -0500

Bernd, I have had similar problems with my MP.  Originally, it was the 
so-called "15M SWR Problem" that plagued many of the original MPs, but 
Yaesu eventually took care of it.  (Actually, the problem manifested 
itself on all bands above 20M, and seemed to be more frequent as the 
band frequency increased.)

However, even after Yaesu seemed to have solved the basic 15M SWR 
problem, the SWR would unpredictably go haywire periodically.  Yaesu 
worked on it again and concluded that the problem seemed to be 
associated with the amps that I was driving at the time: a vintage 30S1 
and a Viking Thunderbolt.  When I replaced them with a TenTec Titan 425, 
my problems disappeared...for the most part.  I say for the most part 
because every now and then, totally without warning and for no obvious 
reason, the SWR will go haywire.  The only solution I've found is to do 
just as you said, i.e, turn the rig off for a few minutes.  The last 
time it happened was about three months ago and it hasn't shown up 
since, but based on a consistent history over the years, I'm sure that 
I'll see it again.

73, Joe

Bernd Bracher wrote:

>hallo
>on my mp was the same problem
>but only on a smal part of 20m..
>the memory of the tuner was full
>make a master - reset
>
>see this
>I was using the antenna tuner on 15m and noticed that the tuner did not tune
>anymore. Actually when I press tuner- button, the "tuner" and the "wait"
>light was on, hen I press tune-button and nothing happened exept swr in the
>mp-meter was 3.0:1, but it did not tune at all. I check other bands 40-10m,
>where I have antennas
>and all has the same thing, swr was even more than on 15m and tuner did not
>work at all. So I took power down from the front panel, I took power down
>from the separate power supply and wait, thinkin at the same, that what the
>heck I made wrong. After a while, less than a minute, I heard tiny "klik...
>klik" sound, maybe two of them. I decided to put power back on and
>everything seemed to be normal again, it does tune on every band properly.
>So I do not know what happened, but time made the trick this time. I did not
>"reset", nor "boot" my mp. I wonder, what was it? Normal? or just maybe
>overheating. Does someone else had the same problem? I remember tuner
>troubles wroute before here on reflector, was mine the same thing and does
>it have a cure, or should it be cured?
>73's & DX de Tor / OH2BV
>
>I have experienced two inexplicable incidents recently in which after I
>switched bands, the SWR maxed out with or without the tuner in line.  The
>only way I have been able to correct the high SWR condition is to turn the
>power off and then on.  This is the first time I have observed this behavior
>in three years.
>73 Joe
>
>Solutions/Comments:
>
>It's because you exceeded the 39 memory channels allocated to the antenna
>tuner. There has been much said about this. Search through the archives,
>there is a ton of information on this subject. John Winward, K3AOT
>
>Press SUB/CE and ENT together while powering up.  The will reset the tuner
>memories (and all other memories).  It will not reset the menu settings.
>You do not have to run TUNE for the antenna tuner every time you change
>bands.  It remembers tuner settings 39 times.  It is suggested that you use
>TUNE only two times for each band -- once for the low end (CW) and once for
>the high end (SSB).  The tuner does a good job of tracking between these two
>memorized settings.  If you do this, you will never fill up the 39 tuner
>memories again.
>73, de Earl, K6SE
>
>73 de bernd  dl8scg
>----- Original Message ----- 
>From: <[email protected]>
>To: <[email protected]>
>Cc: <[email protected]>; <[email protected]>
>Sent: Thursday, December 25, 2003 10:30 PM
>Subject: Re: [1000mp] Strange bahaviour on 80 meters
>
>
>  
>
>>Thanks for the reply. Given some of the other things we
>>have seen, that will probably have an effect, but isn't that
>>dealing with symptomes rather than the real problem?
>>
>>cheers, Paul - VA7NT
>>
>>On Thu, 25 Dec 2003 13:45:07 -0800 [email protected] wrote:
>>    
>>
>>>Has he tried changing the length of the cable between rig and amp?
>>>
>>>-----Original Message-----
>>>From: [email protected]
>>>[mailto:[email protected]]On Behalf Of [email protected]
>>>Sent: Thursday, December 25, 2003 12:19 PM
>>>To: [email protected]
>>>Cc: [email protected]; [email protected]
>>>Subject: [1000mp] Strange bahaviour on 80 meters
>>>
>>>
>>>A friend has recently aquired a 1000mp, and in the process of
>>>setting it up, we discovered that for some reason it has trouble
>>>driving his Alpha 86 on 80 meters. The internal metering indicates
>>>a high swr in the cw portion of that band, this resulting in a
>>>power fold back. The tuner can be used to compensate however, I don't
>>>think that this is dealing with the problem. Initially we thought
>>>the problem might be with the input circuit of the 86, but with
>>>another swr bridge in the line between the rig and the amp, the
>>>bridge shows a flat swr when the rig "tuned" with the antenna
>>>tuner. If the problem were with the input circuit one would expect
>>>the amp input swr to remain constant even though the rig could
>>>be fooled into full output by using the tuner. I suspect that
>>>the MP is putting out out of band energy in 80 meters, thus giving
>>>the poor swr indication. This is further confirmed by placing
>>>an ICE 80 meter bandpass filter between rig and the amp.
>>>
>>>Other rigs in the shack have no difficulty driving the 86 and
>>>do not give the same high swr indication.
>>>
>>>Am I on the right track here, or am I missing something?
>>>
>>>Has anyone else encountered this, and if so what must be done
>>>to fix it?
>>>
>>>Thanks in advance.
>>>
>>>cheers, Paul - VA7NT ex VE7CQK - email: [email protected]
>>>"Those who hear not the music. . . think the dancers mad."
>>>_______________________________________________
>>>List Moderator: Richard Lubash N1VXW
>>>1000mp mailing list
>>>[email protected]
>>>To Change Options or Unsubscribe:
>>>http://mailman.qth.net/mailman/listinfo/1000mp
>>>
>>>_______________________________________________
>>>List Moderator: Richard Lubash N1VXW
>>>1000mp mailing list
>>>[email protected]
>>>To Change Options or Unsubscribe:
>>>http://mailman.qth.net/mailman/listinfo/1000mp
>>>      
>>>
>>cheers, Paul - VA7NT ex VE7CQK - email: [email protected]
>>"Those who hear not the music. . . think the dancers mad."
>>_______________________________________________
>>List Moderator: Richard Lubash N1VXW
>>1000mp mailing list
>>[email protected]
>>To Change Options or Unsubscribe:
>>http://mailman.qth.net/mailman/listinfo/1000mp
>>    
>>
>
>
>_______________________________________________
>List Moderator: Richard Lubash N1VXW
>1000mp mailing list
>[email protected]
>To Change Options or Unsubscribe:
>http://mailman.qth.net/mailman/listinfo/1000mp
>
>
>  
>

--- StripMime Report -- processed MIME parts ---
multipart/alternative
  text/plain (text body -- kept)
  text/html
The reason this message is shown is because the post was in HTML
or had an attachment.  Attachments are not allowed.  To learn how
to post in Plain-Text go to: http://www.expita.com/nomime.html  ---