[TenTec] Corsair II noise blanker

Mon Mar 31 01:12:28 EDT 2014

Hi ??? (sorry, somehow I missed your name),

Actually the talk of the "Jones Filter" may not be as far-fetched as you
think.
In the early days of Ten-Tec, Lee Jones was the chief technology officer.
Guess who designed the Jones Filter!

Well in his previous life Lee had worked for a guy named "Art", somewhere in
Colorado - long before their famous S-Line was introduced.  In a much
earlier receiver, that company produced a tunable Xtal filter using a single
Xtal.  Obviously its flanks were nothing to write home about, but the idea
of a tunable Xtal filter was new and patented. And at that time, QRM was
nothing like it is today, so the filter really was state-of-the art (no pun
intended).

At Ten-Tec, Lee advanced the design, enabling it to work with multiple
crystals.  Apparently he changed enough to enable applying for and obtaining
a new patent.

So if we consider this, then let's look at the filter in the Century.
As I said, I've never seen one and really never even studied the schematic,
but maybe its filter resembles the one formerly used at Collins and
therefore somebody concluded the Century had a Jones filter.
THIS IS 100% SPECULATION ON MY PART, but it sure seems plausible to me.

Honestly, I would love to borrow a good working unit and see how they work.
Things have changed for the better here in Europe.
A few years ago the broadcast stations were forced to move outside of the
40m band and they expanded our 40m band from just 100 kHz to 200 kHz. As a
result, most of the garbage is gone and the QRM has spread out a little.
THE CENTURY MIGHT BE A DECENT RIG, NOW.

ANYONE OWN A CENTURY AND LIVE NEAR CENTRAL GERMANY?

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

-----Original Message-----
From: TenTec [mailto:tentec-bounces at contesting.com] On Behalf Of paulpolace
Sent: Sunday, March 30, 2014 5:37 AM
To: Discussion of Ten-Tec Equipment
Subject: Re: [TenTec] Corsair II noise blanker

Rick,

Actually was only a variable 8 pole "audio" bandpass filter, but somehow
produces some fantastic results in relation to noise as well.
There was always talk that the C-22  incorporated the "Jones Filter" but the
patent on it was filed in 1989 and the C-22 made in early mid 80's 84 ETC.

The early Argonauts were produced prior to the Century-22 so not sure if the
C-22 inherited any circuitry from them?

If you ever come across one Rick, you must give it a spin, kind of hard to
explain the experience!

Yes I remember the outboard filters, in the day manufactured for the
Woodpecker...Now we have neighbors electric fences and grow lamps to deal
with!

Kind Regards... -GL-  -DX-

+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

----- Original Message -----
From: "Rick - DJ0IP / NJ0IP" <Rick at DJ0IP.de>
To: "'Discussion of Ten-Tec Equipment'" <tentec at contesting.com>
Sent: Saturday, March 29, 2014 7:21 PM
Subject: Re: [TenTec] Corsair II noise blanker

> Are you referring to the LC BPF's in the front end?
>
> I never saw a Century but if it has the elevator like the Argonauts and
> Tritons had in those days, then yes, in general it did help reduce overall
> noise, but it will not help on things like the pop of an electric fence.
>
> In fact, back in the days of the Woodpecker, whose signal was wide but its
> signal strength was frequency dependent, I could slightly de-tune the
> preselector on my Omni and then hear signals better than I could on JA 
> rigs
> with no tunable preselector... as long as I wasn't trying to listen to a
> signal near the Woodpecker's frequency.
>
> 73 - Rick, DJ0IP
> (Nr. Frankfurt am Main)
>
>
> -----Original Message-----
> From: TenTec [mailto:tentec-bounces at contesting.com] On Behalf Of 
> paulpolace
> Sent: Saturday, March 29, 2014 11:35 PM
> To: Discussion of Ten-Tec Equipment
> Subject: Re: [TenTec] Corsair II noise blanker
>
> Correct Rick!
>
> The topic is NB... NOT... NR.
>
> Hard to believe or understand... yet my Century-22 actually handles noise
> better than the Omni VII, and were going way back.
> Could the variable 8-pole bandpass filter been designed so well that it
> accounted for such noise as well? or possibly just my experiences.
>
> The Eagle here also does a better job than the Omni VII.
>
> Interesting the NB in My Kenwood TS-590 works unbelievably well, yet the
> design on that one allows a variable user interface to set accordingly.
>
> Also Good Info there N6KB
>
>
> -73-  -DX-
>
>
> +++++++++++++++++++++++++++++++++++++++++++++++++++
>
>
>
>
>
>
> ----- Original Message -----
> From: "Rick - DJ0IP / NJ0IP" <Rick at DJ0IP.de>
> To: "'Discussion of Ten-Tec Equipment'" <tentec at contesting.com>
> Sent: Saturday, March 29, 2014 3:02 PM
> Subject: Re: [TenTec] Corsair II noise blanker
>
>
>> Correct, but the topic was NB, not NR.
>> The Eagle's NB is better than the OM7's.
>>
>> The reverse is true for NR.
>>
>> 73 - Rick, DJ0IP
>> (Nr. Frankfurt am Main)
>>
>>
>> -----Original Message-----
>> From: TenTec [mailto:tentec-bounces at contesting.com] On Behalf Of R. Eric
>> Sluder - W9WLW
>> Sent: Saturday, March 29, 2014 5:16 PM
>> To: Discussion of Ten-Tec Equipment; K8JHR
>> Subject: Re: [TenTec] Corsair II noise blanker
>>
>> I like the NR in the Omni VII much better than the one in the Eagle.  The
>> audio characteristics in the Eagle change dramatically in SSB and AM
>> modes.
>>
>> On March 29, 2014 12:22:06 AM EDT, K8JHR <jrichards at k8jhr.com> wrote:
>> |Ken and Bob -
>> |
>> |Man... thanks - exactly the sort of explanation I wish they would put
>> |in user manuals for guys like me who are not radio engineers.
>> |
>> |Sidebar --
>> |
>> |There is an on-going debate on a Brand X radio forum, whether one NB
>> |(and/or NR) circuit is better than another.  The answer seems to be:
>> |"it depends" on the type of noise, and how it interacts with the
>> |desired signal.
>> |
>> |My Take --
>> |
>> |Satisfaction with NR and NB is entirely dependent on one's
>> |expectations, generally, and one's tolerance of the necessary tradeoff
>> |between
>> |intelligibility and audio quality.   I am a fan of both internal and
>> |outboard DSP noise filters, but I know greater intelligibility comes
>> |with a price in lower audio quality.
>> |
>> |On the Brand X forum, some operators expect clean, pure, audiophile
>> |results after scrubbing and scouring with NR, NB, and related tools.
>> |Unfortunately, there just ain't no free lunches these days.
>> |
>> |Wish List Item --
>> |
>> |I like the NR on my Omni VII, although I preferred how it worked in
>> |earlier firmware.  (I am less enamored with the NR on my Orion II.)
>> |
>> |Too bad we cannot select feature updates from a smorgasbord of firmware
>> |
>> |versions, sort of a mix-n-match thing.  Now, THAT would be cool.   (I
>> |can, however, just imagine the programming nightmare THAT might entail!
>> |
>> | We would be visiting John Henry in the looney bin sooner than later!)
>> |     ;-)
>> |
>> |Just My take.
>> |
>> |------------------------ K8JHR  ------------------
>
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