[TenTec] I need a Titan 525 Expert!

[GARY HUBER]

Don't call me an expert, but I have been running Titan 425 QSK for 15 years. I think you might be on the right track about RF timing and that's the first area I'd look. Anything in the exciter's T/R sequencing circuit that could degrade the contact closure of its amplifier-controlling relay and allow exciter RF to be present at the amp's input before it sequences to transmit is suspect. Have you put the amplifier into QSK transmit by manual means (foot switch, key, short, etc.) and then keyed the exciter? You shouldn't have to bypass the RF sense circuit if you can force the amp into QSK transmit before keying the exciter. 

What's the SWR between the exciter and amp when the exciter is key down and the amp has no output?

What exciter are you using with the amp? What modes are you having the problem with; PTT/VOX SSB or CW or QSK?

73,

AB9M - Gary
www.csm-gh.com<http://www.csm-gh.com/>
  ----- Original Message ----- 
  From: Larry Groom<mailto:lgroom at frontiernet.net> 
  To: tentec at contesting.com<mailto:tentec at contesting.com> 
  Sent: Wednesday, October 26, 2005 7:21 PM
  Subject: [TenTec] I need a Titan 525 Expert!


  My late model Titan amp has had a problem that at first would
  show up seldom, but has now shown up regularly. It will not put
  out power when the exciter is key down. I can hear the Vacuum relay
  keying up, but there is no output. A friend tested the relay over 100 times 
  with no failure. 
  My question is this... Is it possible to bypass the circuit that senses the
  input RF and then allows the amp to key up? I would like to see if it 
  will work when PTT is grounded with the RF sensing circuit bypassed, thus
  eliminating a possible trouble spot. I called Ten-Tec and they said they'd
  be happy to work on it, but that it could be a ton of things including the
  tubes
  etc and I'd like to have an idea of what is wrong if I could. I wish the
  problem
  wasn't intermittant, that would help.
   
  Thanks in advance for any help
   
  73's Larry
  lgroom at frontiernet.net<mailto:lgroom at frontiernet.net>
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