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Re: [TenTec] Corsair noise blanker and frequency display

To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
Subject: Re: [TenTec] Corsair noise blanker and frequency display
From: "Bob McGraw - K4TAX" <RMcGraw@Blomand.net>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Mon, 3 Feb 2014 12:30:00 -0600
List-post: <tentec@contesting.com">mailto:tentec@contesting.com>
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@comcast.net>
To: "Discussion of Ten-Tec Equipment" <tentec@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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