[TenTec] Corsair noise blanker and frequency display

Mon Feb 3 19:48:41 EST 2014

Yes, there's lots of room inside the TRITON. I really take advantage of the PBT and notch on the Corsair with heavy QRM...if my damnable noise isn't present, which is why I was focusing on improving the Corsair's NB. The TRITON is great for late-nite DX'ing when QRM's not heavy, but with weekend QRM/traffic, the Triton just can't cope as well as the Corsair with it's PBT and notch (and two 8-pole filters). 

73,
Allen---W7GIF
  ----- Original Message ----- 
  From: Rick - DJ0IP / NJ0IP<mailto:Rick at DJ0IP.de> 
  To: 'Discussion of Ten-Tec Equipment'<mailto:tentec at contesting.com> 
  Sent: Monday, February 03, 2014 3:15 PM
  Subject: Re: [TenTec] Corsair noise blanker and frequency display

  YES, that is the correct link.
  I just downloaded the file.
  Tnx Barry!

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

  -----Original Message-----
  From: TenTec [mailto:tentec-bounces at contesting.com] On Behalf Of Barry N1EU
  Sent: Monday, February 03, 2014 11:01 PM
  To: Discussion of Ten-Tec Equipment
  Subject: Re: [TenTec] Corsair noise blanker and frequency display

  The article was in QST Sept 1981.  This might be the link to the article on
  adding the filter (ARRL member's only):

  http://p1k.arrl.org/pubs_archive/74970<http://p1k.arrl.org/pubs_archive/74970>

  Barry N1EU

  On Mon, Feb 3, 2014 at 9:51 PM, Barry N1EU <barry.n1eu at gmail.com<mailto:barry.n1eu at gmail.com>> wrote:
  > There was an article in QST a while back (early 80's ?) about adding 
  > 9MHz Ten-Tec filters externally to the Triton.
  >
  > 73, Barry N1EU
  >
  > On Mon, Feb 3, 2014 at 9:28 PM, Rick - DJ0IP / NJ0IP <Rick at dj0ip.de<mailto:Rick at dj0ip.de>>
  wrote:
  >> 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<mailto:RMcGraw at Blomand.net>>
  >>   To: Discussion of Ten-Tec Equipment<mailto:tentec at contesting.com<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<mailto:k6jek at comcast.net%3Cmailto:k6jek at comcast.net>>>
  >>   To: "Discussion of Ten-Tec Equipment"
  >> <tentec at contesting.com<mailto:tentec at contesting.com<mailto:tentec at contesting.com%3Cmailto: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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