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JPS NIR-12 with K3 IN RTTY Contest

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radioshoppe

JPS NIR-12 with K3 IN RTTY Contest

Hi to everyone,
Some may recall that a couple of weeks ago I asked about hooking up a JPS NIR-12 DSP between my K3 and computer for RTTY contesting. The idea was to try to clean up the signal a bit more before the sound card prcesses it. I under took this after learning that at least one prominent RTTY contester does this with excellent results. But, for me, in a few words it didn't work out very well even though I tested it prior to the RTTY Roundup contest. There may have been some extenuating circumstances as after again hooking the audio straight from the K3 to the computer there still seemed to be some muddiness without totally clean decoding. I will have to do some more troubleshooting on that. Once I get that sorted out I am going to try the DSP again. If I make progress I will report back for those interested.
I might add that the K3 with my K2 in a SO2R combination was not a total disaster as I had 917 contacts in about 18 hours of operating. I used a Heathkit active filter between the K2 and the computer and found it greatly helped clean up the audio making decode in MMTTY the best I've seen in some years of RTTY contesting. I used it in combination with some DSP processing and XFIL RF3 in the K2. It would have been nice if the MMTTY decoding of the K3 audio had been as good.
Sorry for the bandwidth, but one thing I might add. I use ear buds with a small commercially available combiner box to listen to the audio from each radio. Shortly before the contest I realized I had a giant ground loop someplace. After trouble shooting I found it was caused by the box grounding the two radio's together. A hastily put together isolation transformer solved that.
Constructive thought and comments always appreciated.

Take pride in the USA. 73

Jim, W0EM
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Guy, K2AV

Re: JPS NIR-12 with K3 IN RTTY Contest

I own a JPS NIR 12. As well as that operated when I first got it, I found
that it was inferior to the AF DSP in the K2. The K3, with the entire IF
available to drive its functions, at the IF level, is superior to both the
K2 and particularly superior to my NIR 12. The only thing that I can
imagine the JPS unit doing is adding to the inevitable artifacts of DSP
processing.

If you actually do find that the JPS adds something positive to the results
please let me know, I'd like to try and duplicate it. I've not found
anything useful for it to do in a long time.

73, Guy.

On Wed, Jan 11, 2012 at 12:44 PM, Jim Harris <[hidden email]> wrote:

> Hi to everyone,
> Some may recall that a couple of weeks ago I asked about hooking up a JPS
> NIR-12 DSP between my K3 and computer for RTTY contesting. The idea was to
> try to clean up the signal a bit more before the sound card prcesses it. I
> under took this after learning that at least one prominent RTTY contester
> does this with excellent results. But, for me, in a few words it didn't
> work out very well even though I tested it prior to the RTTY Roundup
> contest. There may have been some extenuating circumstances as after again
> hooking the audio straight from the K3 to the computer there still seemed
> to be some muddiness without totally clean decoding. I will have to do
> some more troubleshooting on that. Once I get that sorted out I am going to
> try the DSP again. If I make progress I will report back for those
> interested.
> I might add that the K3 with my K2 in a SO2R combination was not a total
> disaster as I had 917 contacts in about 18 hours of operating. I used a
> Heathkit active filter between the K2 and the computer and found it greatly
> helped clean up the audio making decode in MMTTY the best I've seen in some
> years of RTTY contesting. I used it in combination with some DSP
> processing and XFIL RF3 in the K2. It would have been nice if the MMTTY
> decoding of the K3 audio had been as good.
> Sorry for the bandwidth, but one thing I might add. I use ear buds with a
> small commercially available combiner box to listen to the audio from each
> radio. Shortly before the contest I realized I had a giant ground loop
> someplace. After trouble shooting I found it was caused by the box
> grounding the two radio's together. A hastily put together isolation
> transformer solved that.
> Constructive thought and comments always appreciated.
>
> Take pride in the USA. 73
>
>
>
> Jim, W0EM
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>

______________________________________________________________
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Post: mailto:[hidden email]

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Keith Heimbold

Re: JPS NIR-12 with K3 IN RTTY Contest

Thanks for answering a question I had about my NIR-12 which worked really nicely with my Yaesu FT950. After using the K3 the past two months and it's awesome DSP and NB, I didn't think it would really do much to improve it.

I guess i will put it in my truck now with my 857D.

Thanks,

Keith
AG6AZ

Sent from my iPhone please excuse typos

On Jan 11, 2012, at 11:32 AM, "Guy Olinger K2AV" <[hidden email]> wrote:

> I own a JPS NIR 12. As well as that operated when I first got it, I found
> that it was inferior to the AF DSP in the K2. The K3, with the entire IF
> available to drive its functions, at the IF level, is superior to both the
> K2 and particularly superior to my NIR 12. The only thing that I can
> imagine the JPS unit doing is adding to the inevitable artifacts of DSP
> processing.
>
> If you actually do find that the JPS adds something positive to the results
> please let me know, I'd like to try and duplicate it. I've not found
> anything useful for it to do in a long time.
>
> 73, Guy.
>
> On Wed, Jan 11, 2012 at 12:44 PM, Jim Harris <[hidden email]> wrote:
>
>> Hi to everyone,
>> Some may recall that a couple of weeks ago I asked about hooking up a JPS
>> NIR-12 DSP between my K3 and computer for RTTY contesting. The idea was to
>> try to clean up the signal a bit more before the sound card prcesses it. I
>> under took this after learning that at least one prominent RTTY contester
>> does this with excellent results. But, for me, in a few words it didn't
>> work out very well even though I tested it prior to the RTTY Roundup
>> contest. There may have been some extenuating circumstances as after again
>> hooking the audio straight from the K3 to the computer there still seemed
>> to be some muddiness without totally clean decoding. I will have to do
>> some more troubleshooting on that. Once I get that sorted out I am going to
>> try the DSP again. If I make progress I will report back for those
>> interested.
>> I might add that the K3 with my K2 in a SO2R combination was not a total
>> disaster as I had 917 contacts in about 18 hours of operating. I used a
>> Heathkit active filter between the K2 and the computer and found it greatly
>> helped clean up the audio making decode in MMTTY the best I've seen in some
>> years of RTTY contesting. I used it in combination with some DSP
>> processing and XFIL RF3 in the K2. It would have been nice if the MMTTY
>> decoding of the K3 audio had been as good.
>> Sorry for the bandwidth, but one thing I might add. I use ear buds with a
>> small commercially available combiner box to listen to the audio from each
>> radio. Shortly before the contest I realized I had a giant ground loop
>> someplace. After trouble shooting I found it was caused by the box
>> grounding the two radio's together. A hastily put together isolation
>> transformer solved that.
>> Constructive thought and comments always appreciated.
>>
>> Take pride in the USA. 73
>>
>>
>>
>> Jim, W0EM
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:[hidden email]
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html