[1000mp] Mark V high SWR with amp

[Larry Dajnowski]

I have owned a Alpha 99 and now
an Alpha 87a; Alpha does recommend
using a 6 foot length of 50 ohm coax
between the rig and input to the Amp.

Just a suggestion.

73, Larry AJ2W

  ----- Original Message ----- 
  From: Michael W Elliott 
  To: All about Yaesu 1000mp 
  Sent: Sunday, February 06, 2005 10:41 AM
  Subject: Re: [1000mp] Mark V high SWR with amp 


  Well let me replay the descriptiomn.
   
  The amps are Alpha 99 and Alpha 89.
   
  These are modern amps.
   
  Next:
   
  The swr on the out meters of a Bird and Nye Viking Tuner show output swr fine.
   
  Swr on amplifier says ok
   
  SWR when running barefoot no problem on the rig.
  Once I switch on the amp the problem occurs.  Seems like there is a mismatch back to the input side althought the output side says everything is ok.
   
  I will call Yaesu on Monday and describe the situation.
   
  Only other thing  I can think of is NKE Viking tuner being in line.  Gonna take it out of line and run and see what happens.  Would sound strange if the tuner but could be possible.
   
  Mike

  Gene Davies AA6NP <aa6np at mind.net> wrote:
  It sounds like you are saying that your set-up WAS
  working fine, but now you have a high swr when
  running with your amp. Try inserting an swr meter
  between the two to verify the reading on your MK5.
  If the reading is high, there is a problem with
  the amp. It could be a problem with the amp's
  input circuit (tuned or broadband), this is not
  likely though.. It could also be a bad tube in the
  amp. Also check the transmit/rcv relay in the amp.

  73,
  Gene



  ----- Original Message -----
  From: 
  To: <1000mp at mailman.qth.net>
  Sent: Sunday, February 06, 2005 7:37 AM
  Subject: Re: [1000mp] Mark V high SWR with amp


  > In a message dated 2/5/2005 7:33:35 PM Central
  Standard Time,
  > kq0b at sbcglobal.net writes:
  > I have started to notice a high swr reading on
  the
  > input side (transceiver) while running with amp.
  > Hello,
  >
  > Your problem is due to the fact that your
  amplifier does not have a tuned
  > input circuit. A modern amplifier that is
  designed to work with modern solid
  > state trasnceivers has a tuned input circuit for
  each band the amplifier
  > functions on.
  >
  > You can simply use the internal antenna tuner to
  match the radio to the
  > amplifier, you may need to retune the amplifier
  slightly after you auto tune the
  > radio.
  >
  > Enjoy and 73
  > Douglas
  >
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  >






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  Michael W. Elliott
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