[TenTec] Corsair II noise blanker

Mon Mar 31 22:08:08 EDT 2014

I've noticed that, too. The simple audio filter in my Century 22 does an 
amazing job of filtering out noise (mainly a buzz from switching power 
supplies and plasma TVs in the neighborhood). Also, it does not 
introduce distortion like the blanker in My Paragon.

I wonder if just keeping the RF gain  low so the noise doesn't capture 
the AGC and using an outboard SCAF audio filter would be effective 
against impulse noise.

             73,

             Bob WB2VUF

On 3/29/2014 11:37 PM, paulpolace wrote:
> 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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