[TenTec] Corsair noise blanker and frequency display

[Rick - DJ0IP / NJ0IP]

Allen, why don't you add some selectivity to the Triton.
I did it to the Argonaut 505 and 509 so there is certainly room to do it to
the Triton.

In my case I replaced the Argonaut's 4-pole discrete Xtals filter (SSB) with
a KVG 8-pole Xtal filter, then added a 6-pole 500 Hz filter in series with
it.  I used on out of an early Yaesu transceiver.  This, together with the
standard audio filter gave the rig excellent selectivity.

73 - Rick, DJ0IP
(Nr. Frankfurt am Main)


-----Original Message-----
From: TenTec [mailto:tentec-bounces at contesting.com] On Behalf Of A R
Sent: Monday, February 03, 2014 8:00 PM
To: Discussion of Ten-Tec Equipment
Subject: Re: [TenTec] Corsair noise blanker and frequency display

Bob,
Yeah, the random number generator on the display is the display itself. The
frequency itself is rock-solid, and after one minute, the display homes in
on the actual frequency.

Having struggled with a variety of ineffective nb's on several high-tech
transceivers that were unable to cope with my noise, I was really impressed
by the TRITON's ability to eliminate the noise. If only the TRITON had the
selectivity of the Corsair, or the Corsair had the NB effectiveness of the
TRITON, I'd be a real happy camper. An outboard ANC-4 noise canceller works
pretty well most of the time, but the Triton's nb works all the time,
without having to fiddle with tuning adjustments, and I hate using outboard
band-aids. I'm looking seriously at adapting the Triton 249 NB into the
Corsair.

73,
Allen--W7GIF
  ----- Original Message ----- 
  From: Bob McGraw - K4TAX<mailto:RMcGraw at Blomand.net> 
  To: Discussion of Ten-Tec Equipment<mailto:tentec at contesting.com> 
  Sent: Monday, February 03, 2014 11:30 AM
  Subject: Re: [TenTec] Corsair noise blanker and frequency display


  I wonder if this is a display issue or are the oscillators actually
changing 
  frequency and same is being displayed.  I have an older radio, non Tentec,

  that when first turned on the display looks more like the lights on a 
  pinball machine.  The oscillators are moving as well as the display 
  reference frequency.  It is a real hoot to watch for about the first 30 
  minutes or so then it finally settles down.

  As to noise blankers, historically I've found only a very few really good 
  noise blankers and at that same time there's a lot of noise blankers.  The

  Collins variable blanking bandwidth system seems to always be the best.
The 
  rest are mostly copies and less effective compromises.  Of recent, the 
  hardware NB as used in the Eagle is one of the better systems.  One factor

  that seems to impact the effectiveness is more related to where the
blanking 
  takes place as related to the AGC system.  And as Rob Sherwood concluded, 
  the AGC has a notable effect on pulse type noise.

  73
  Bob, K4TAX




  ----- Original Message ----- 
  From: "k6jek" <k6jek at comcast.net<mailto:k6jek at comcast.net>>
  To: "Discussion of Ten-Tec Equipment"
<tentec at contesting.com<mailto:tentec at contesting.com>>
  Sent: Monday, February 03, 2014 12:14 PM
  Subject: Re: [TenTec] Corsair noise blanker and frequency display


  > FWIW my Corsair does exactly the same thing on both counts.
  >
  > On Feb 3, 2014, at 9:12 AM, A R wrote:
  >
  >> I received my newly acquired Corsair (not II), s/n  718, and have a 
  >> couple of questions:
  >>
  >> At cold start-up in the morning, it takes about a minute for the 
  >> displayed frequency to stabilize and display the actual frequency.
During 
  >> that warm-up minute, all the display digits are toggling "randomly". Is

  >> this a common issue with the Corsairs? Is there a remedy?
  >>
  >> 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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