[TenTec] Corsair noise blanker and frequency display

[A R]

Gary,
A quick viewing of your QRZ page indicates that unless you've downgraded, you have a Corsair II. Checking the manual schematics for both the Corsair and the Corsair II, I find the noise blankers between the two to be two entirely different animals, although TenTec elected to identify both versions with the same part number (80977). ??

The Corsair 80977 noise blanker board has the noise blanking circuitry AND the 1st IF 9MHz crystal filter.

The Corsair II 80977 noise blanker board has ONLY the noise blanking circuitry. The Corsair II's 1st IF 9MHz crystal filter is on a separate board 81253 XTAL FILTER BOARD, that is mounted sort of side-saddle to the PBT board (where the 2nd IF crystal filters are located).

The schematic and functional  differences between the two NB boards (although the boards carry the SAME part number), are SIGNIFICANT....and apparently, the Corsair II's NB design actually works, unlike that of the Corsair's NB.

Mystery of differing observed NB performance/experience solved.

73,
Allen---W7GIF



  ----- Original Message ----- 
  From: Gary Smith<mailto:Gary at ka1j.com> 
  To: Discussion of Ten-Tec Equipment<mailto:tentec at contesting.com> 
  Sent: Monday, February 03, 2014 6:42 PM
  Subject: Re: [TenTec] Corsair noise blanker and frequency display


  Funny, I find the Corsair's noise blanker to be a godsend with the 
  power line noise from the RR track. Haven't tried the Triton but the 
  Corsair's NB is better than my much newer and much more capable rig. 
  I only wish I had that blanker in all the rigs.

  Gary
  KA1J 

  ----- Original Message ----- 
  From: A R<about:blank> 
  To: tentec<about:blank> 
  Sent: Monday, February 03, 2014 10:12 AM
  Subject: [TenTec] Corsair noise blanker and frequency display


  I received my newly acquired Corsair (not II), s/n  718, and have a couple of questions:

  The noise blanker is ineffective with respect to eliminating or even noticeably reducing powerline-generated noise that my TRITON noise blanker completely eliminates. Again, is this a common issue with the Corsairs. If so, has anyone developed a modification that improves the effectiveness of the NB? The TRITON's NB is so effective in eliminating at least the noise that plagues me, I'd sure like to get the same NB effectiveness out of the Corsair. The NB's of the TRITON and Corsair are architecturally the same (signal flow and conditioning), so if the Corsairs have characteristically ineffective noise limiters, my powerline-generated noise is enough of an operating problem, that I would even entertain adapting the TRITON's NB to the Corsair....as a last resort.

  Allen------W7GIF


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