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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