[TenTec] Corsair II noise blanker

[Doug Reid]

Good explanation !  Maybe they should have had several different stages built into the NB for different applications. They probably did just that.  My Triton still works very well for most noise problems.

Doug  WD4LNW



-----Original Message-----
From: Rick - DJ0IP / NJ0IP <Rick at DJ0IP.de>
To: 'Discussion of Ten-Tec Equipment' <tentec at contesting.com>
Sent: Fri, Mar 28, 2014 10:41 am
Subject: Re: [TenTec] Corsair II noise blanker


* Why anyone would change a good design is a mystery. *
The requirements changed.
When the Triton was designed, about the only need for a noise blanker was
or ignition noise.
he noise blanker was often optional because if you didn't work mobile, you
idn't need it.
About the same time, The Woodpecker (terrestrial radar) hit the bands and
as a huge disturbance.
anufacturers began modifying the NBs in an attempt to fight that
isturbance.
ome helped a little, some helped a lot.
Then rigs changed technology.
adios with upward conversion were totally different and that required a
undamental re-design, including the NB.
ow most radios are back to downward conversion.
equires another re-design.
If we had always only had radios with just one single conversion and all on
 MHz, then your question would certainly be a good one.  But things have
hanged many times since then.
It seems that recently software NBs were tried but didn't work so well.
ith the Eagle they have returned to a hardware NB and it seems to be
etter.
When judging these NBs, you have to be careful.
n the presence of very short pulses, most DSP radios 'had' huge AGC
roblems.
hese are things like static crashes or electrical fences.
lex and Elecraft successfully addressed this but others did not.
f you turned on an NB and find you still have problems, it may very well
ave been that the problem was in the AGC and the NB doesn't help.  However
hat has finally been improved (for OR and OM7) in recent firmware releases.
73 - Rick, DJ0IP
Nr. Frankfurt am Main)
-----Original Message-----
rom: TenTec [mailto:tentec-bounces at contesting.com] On Behalf Of Doug Reid
Why anyone would change a good design is a mystery.

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