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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: Barry N1EU <barry.n1eu@gmail.com>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Mon, 3 Feb 2014 22:00:44 +0000
List-post: <tentec@contesting.com">mailto:tentec@contesting.com>
The article was in QST Sept 1981.  This might be the link to the
article on adding the filter (ARRL member's only):

http://p1k.arrl.org/pubs_archive/74970


Barry N1EU



On Mon, Feb 3, 2014 at 9:51 PM, Barry N1EU <barry.n1eu@gmail.com> wrote:
> There was an article in QST a while back (early 80's ?) about adding
> 9MHz Ten-Tec filters externally to the Triton.
>
> 73, Barry N1EU
>
> On Mon, Feb 3, 2014 at 9:28 PM, Rick - DJ0IP / NJ0IP <Rick@dj0ip.de> wrote:
>> Allen, why don't you add some selectivity to the Triton.
>> I did it to the Argonaut 505 and 509 so there is certainly room to do it to
>> the Triton.
>>
>> In my case I replaced the Argonaut's 4-pole discrete Xtals filter (SSB) with
>> a KVG 8-pole Xtal filter, then added a 6-pole 500 Hz filter in series with
>> it.  I used on out of an early Yaesu transceiver.  This, together with the
>> standard audio filter gave the rig excellent selectivity.
>>
>> 73 - Rick, DJ0IP
>> (Nr. Frankfurt am Main)
>>
>>
>> -----Original Message-----
>> From: TenTec [mailto:tentec-bounces@contesting.com] On Behalf Of A R
>> Sent: Monday, February 03, 2014 8:00 PM
>> To: Discussion of Ten-Tec Equipment
>> Subject: Re: [TenTec] Corsair noise blanker and frequency display
>>
>> Bob,
>> Yeah, the random number generator on the display is the display itself. The
>> frequency itself is rock-solid, and after one minute, the display homes in
>> on the actual frequency.
>>
>> Having struggled with a variety of ineffective nb's on several high-tech
>> transceivers that were unable to cope with my noise, I was really impressed
>> by the TRITON's ability to eliminate the noise. If only the TRITON had the
>> selectivity of the Corsair, or the Corsair had the NB effectiveness of the
>> TRITON, I'd be a real happy camper. An outboard ANC-4 noise canceller works
>> pretty well most of the time, but the Triton's nb works all the time,
>> without having to fiddle with tuning adjustments, and I hate using outboard
>> band-aids. I'm looking seriously at adapting the Triton 249 NB into the
>> Corsair.
>>
>> 73,
>> Allen--W7GIF
>>   ----- Original Message -----
>>   From: Bob McGraw - K4TAX<mailto:RMcGraw@Blomand.net>
>>   To: Discussion of Ten-Tec Equipment<mailto:tentec@contesting.com>
>>   Sent: Monday, February 03, 2014 11:30 AM
>>   Subject: Re: [TenTec] Corsair noise blanker and frequency display
>>
>>
>>   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<mailto:k6jek@comcast.net>>
>>   To: "Discussion of Ten-Tec Equipment"
>> <tentec@contesting.com<mailto: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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