[Icom] Precise meaning of DSP re: IC-756 etc.

Sat, 22 Feb 2003 19:14:54 -0700

Hi, Chris
You can pick up one of those on eBay or rec.radio.swap. There is one for 
sale right now on the NG.
I saw it this morning. COLD, Brrrr! -30C today. My signal won't get out. 
It's frozen, hi.
I assembled K9GR DSP version 3 quite a while back. I use it all the time 
with my 765.
73,
Tony, VE6CGX

Chris BONDE wrote:

> Since the JPS NIR-12 is no longer available, can you recommend 
> something similar that is available.  Also at what price for the extra 
> gain.
>
> Chris opr VE7HCB
>
> At 07:56 AM 2003-02-22 -0500, you wrote:
>
>> Dear ICOMers:
>>
>> I own an ICOM IC-756 PRO II. Have had it only a few weeks but feel 
>> very comfortable with it and am generally pleased with the 
>> investment. I also own a JPS NIR-12 Noise and Interference Reducer. 
>> For those of you who are not familiar with the NIR-12, it is a highly 
>> configurable digital signal processor that is placed in series with 
>> the audio output of a receiver and drives a speaker or headphones.
>>
>> I have used the NIR-12 with my ICOM 751A and ICOM 761 and it was the 
>> single best accessory I have ever added to my station when these rigs 
>> were the primary HF radio.
>>
>> I agree that some comments about DSP can be less than fully 
>> comprehensible. Being more precise would be a good thing.
>>
>> There is, of course, no question that the IF DSP of the PRO II is 
>> about as configurable as one could hope for when it comes to removing 
>> adjacent frequency interference. The PRO II does not offer any 
>> meaningful AUDIO DSP, which for $3000 seems like an oversight. I 
>> still use the NIR-12 with the PRO II. Having the NIR-12 online gives 
>> me the flexibility to find the absolute best combination of RF and AF 
>> interference removal.
>>
>> The NIR-12 offers Noise Interference Reduction that is adjustable 
>> from almost nothing to fully automatic, Dynamic Peaking that pulls 
>> voice audio out of the noise and makes voice audio much easier to 
>> hear, audio bandwidth that can be varied from wide open to as narrow 
>> as 50 Hertz with the audio peak frequency adjustable from 200 Hertz 
>> to 3400 Hertz. The NIR-12 includes an automatic notch that can 
>> eliminate as many as 5 heterodynes simultaneously from the audio 
>> output. This feature is similar to the PRO II's automatic notch. In 
>> short, the NIR-12 is an absolutely amazing and effective enhancement 
>> to any HF receiver. With the IC-751A and IC-761, I found that I ran 
>> the RF filtering fairly wide and let the fully adjustable capability 
>> of the NIR-12 do most of the selectivity work for me. [ NIR-12 
>> originally retailed for about $300. ]
>>
>> [ Unfortunately, JPS has discontinued serving the Amateur market. 
>> Their products are no longer available. :-(  ]
>>
>> The PRO II is capable of amazing feats of RF selectivity. However, if 
>> you monitor a voice net or engage in a lengthy voice or CW ragchew, 
>> the random noise and static can be draining. No amount of IF DSP will 
>> remove the hiss, static and random noise found in the demodulated 
>> output of the receiver's RF section. The NIR-12 processes the audio 
>> output of the PRO II and essentially eliminates noise, hiss, most 
>> static and accentuates voices (or the desired CW pitch) so well that 
>> listening for a long while is a pleasure. You have to hear it to 
>> believe it.
>>
>> If the PRO II included AUDIO DSP in addition to its IF DSP, then it 
>> truly would be the most complete and perfect amateur HF radio 
>> available anywhere. With the addition of the NIR-12, my PRO II is 
>> indeed the perfect HF radio for me. Perhaps someday there will be a 
>> 756 PRO XXXVII which includes all of the AUDIO DSP functionality I 
>> have described herein.
>>
>> So [ if you've made it this far ] perhaps it would be best if 
>> messages posted included a more detailed description of the type of 
>> DSP being discussed since there is such a clear and distinguishable 
>> difference between the RF and AF DSP capabilities one can enjoy in 
>> these fine HF radios.
>>
>> Hope this helps.
>>
>> 73,
>> Frank N. Haas KB4T
>> Florida
>>
>>
>>
>>
>> ----
>> Your Moderator: Dick Flanagan W6OLD, [email protected]
>> Icom Users Net: Sundays, 1700Z, 14.315 MHz
>> Icom FAQ: http://www.qsl.net/icom/
>
>
>
> ----
> Your Moderator: Dick Flanagan W6OLD, [email protected]
> Icom Users Net: Sundays, 1700Z, 14.315 MHz
> Icom FAQ: http://www.qsl.net/icom/
>