I've been following this thread and was interested in the comments regarding
the JPS NIR units. I had one (but can't remember which one) which I used for
several years. I "up-graded" it when a new ROM was offered. I enjoyed using
it but was frustrated by the processing delay when operating moderate to
high speed CW QSK. I sold the unit to AC9S and later bought an AOR TDF-370
after trying the unit at AOR's booth at Dayton.
I believe AOR has NOT advertised the AOR TDF-370 as well as it deserves OR
they have not gotten the attention the unit deserves. The one feature of the
AOR TDF-370 that I really like is its CW (it has both CW and SSB DSP modes)
STEREO processing with 450 Hz to 800 Hz center frequency AND 300 Hz, 200 Hz,
OR 100 Hz bandwidth. (High freq in left ear. Low freq in right ear) Set the
center freq to your radio's CW offset and
easily zero beat the station you want to work when you hear the CF in
both ears. Or if the DX is weak with lots of cops, drop the BW to
100 HZ, center the DX and note the signals that are more than 50 HZ
higher or lower are gone!
The AOR TDF-370 also has four different DSP schemes for SSB and two more for
CW. Plus a DSP speech processor and "TTY decode". The CW "Stereo" mode was what
hooked me and is the tool I employ often.
Best regards,
CSM(r) Gary Huber - AB9M
9679 Heron Bay Rd
Bloomington, IL 61705
(309-662-0604)
www.csm-gh.com
glhuber@msn.com
gary.huber@us.army.mil
--------------------------------------------------
From: "Michael Tortorella" <w2iy@verizon.net>
Sent: Friday, January 16, 2009 11:17 AM
To: "'Discussion of Ten-Tec Equipment'" <tentec@contesting.com>
Subject: Re: [TenTec] not quite OT: outboard DSPs
> Dean and many others who replied,
>
> First, let me say thank you to all who weighed in on this topic. I have
> learned a lot from you all. A private message that did not get to the
> list
> also recommended the Datong FL-1 or FL-2 which I had never heard of. I
> should add that I am primarily interested in CW and am concerned about how
> these units may interact with the QSK. So I am reading those comments
> particularly closely and if anyone else can offer additional CW-centric
> thoughts that would be great.
>
> Like TenTec equipment, this is a great list. Thank you all again.
>
> 73
> Mike W2IY
>
> -----Original Message-----
> From: tentec-bounces@contesting.com [mailto:tentec-bounces@contesting.com]
> On Behalf Of AL7CR
> Sent: Friday, January 16, 2009 11:35 AM
> To: Discussion of Ten-Tec Equipment
> Subject: Re: [TenTec] not quite OT: outboard DSPs
>
> I have used both extensively on SSB and the NIR-12 is by far the better
> unit. It offers the choice of spectral subtraction, adaptive
> filtering, or both in series. There simply is no comparison between
> the effectiveness of spectral subtraction with adaptive filtering for
> noise reduction. It requires much more processing power to implement
> which is why it is not seen as often in amateur units. It does
> introduce a small time delay into the signal but I personally never
> found this a difficulty. The NIR-12's implementation of adaptive
> filtering is the equal of the DSP59.
>
> The NIR-12 was quite expensive when new. Also the manufacturer decided
> to focus on government applications as I recall. I sold my DSP-59
> after using the NIR-12 for only a short time.
>
> The NIR-12 does not have the "bells and whistles" of the Timewave
> unit. It is a noise reduction unit alone not a multifunction unit.
>
> Dean
> AL7CR
>
> On Thu, 15 Jan 2009 19:55:53 -0500, Michael Tortorella wrote:
>> Good evening, all:
>>
>> Some of using older Tentec equipment can benefit from outboard DSP audio
>> filtering, so this is not quite OT..I wonder if I can tap the list wisdom
>> regarding a preference for the JPS NIR-12 versus the JPS NIR-10 versus
>> the
>> Timewave DSP 59?
>>
>> Thanks for any input and 73 to all,
>>
>> Mike W2IY
>>
>>
>>
>> _______________________________________________
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