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Reviews Categories | Filters, Audio: (DSP and others) | Radio Shack DSP 40 Help

Reviews Summary for Radio Shack DSP 40
Radio Shack DSP 40 Reviews: 39 Average rating: 3.5/5 MSRP: $39.95
Description: Noise reduction system / with built in speaker.
Product is in production.
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NA5XX Rating: 4/5 Mar 6, 2016 18:25 Send this review to a friend
Decent Cheap DSP  Time owned: 6 to 12 months
I am using this DSP mobile with an IC-706. Worked well to filter our adjacent channels during the weekend DX contest. Not excellent DSP, but when you can pick on up for about $15 it is worth it.
IZ7FMM Rating: 2/5 Jan 30, 2016 15:27 Send this review to a friend
Good for CW only  Time owned: 0 to 3 months
Basically this filter works good just as bandwidth filter: excellent filtering on CW, so&so on SSB.
Noise reduction does'n work in any mode.
For CW use with vintage radio it's a very good toy, and you can spare lot of money using this one instead of expancive internal christal roofing filters.
N1HWQ Rating: 3/5 Apr 14, 2015 12:21 Send this review to a friend
Helpful for SWLing  Time owned: more than 12 months
I had one of these little units hiding in the bottom drawer of my nightstand for over 20 years. I had forgotten all about it until I stumbled upon this thread. So I hooked it up to the Sony 7600 shortwave radio on my nightstand and was pleasantly surprised by the results. By turning on DSP and using SSB mode I was able to eliminate about 40 percent of the background noise. Not bad.

I originally bought this device for use in my car with a 10 meter mobile radio years ago. As I recall it wasn't particularly good at eliminating alternator noise while driving. But for casual shortwave listening I'd give it a thumbs up. Every little bit helps.
KD4OBQ Rating: 4/5 Sep 22, 2014 00:20 Send this review to a friend
Great bang for the buck  Time owned: more than 12 months
I have owned one of these since they first came out in the mid 90's. For CW they are wonderful but SSB not so good. I paid full price for mine and peddled it at the next hamfest. A year or so later when they were blowing them out I bought 20 of them for $5 each and doubled my money at hamfests ($10) I did manage to keep one and a few years later got into QRP. Great difference on a HW-7 or 8 and several other rigs through the years. It is no Timewave or JPS but neither was the price. Great unit for CW.

W4KYR Rating: 1/5 Dec 18, 2013 07:51 Send this review to a friend
It did nothing to help electrical buzz  Time owned: 0 to 3 months

I bought this in the mid 1990's when Radio Shack was selling them. I thought it was supposed to help with electrical noise reduction. It seemed to have no effect on helping to reduce the ongoing electrical buzz that appeared nightly in my apartment building.

I can't vouch on how well it worked to clean up CW signals as that is not what I bought it for. But for noise reduction of electrical buzz on the shortwave bands, it did nothing of the sort. I ended up returning to Radio Shack to get my money back.

If you want this to get maybe more clearer CW, it might work. But if you have line interference on the shortwave bands. The only thing this will do is to lighten your wallet some. Steer clear of this.
WA7ZYQ Rating: 3/5 Dec 17, 2013 22:09 Send this review to a friend
It is decent for what it does  Time owned: more than 12 months
This is not the piece of crap that some portray it as, nor is it a wondrous object. It does okay for what it costs.

What it does not do is have any noise reduction, per se. See the QST review and Radio Shack's admission of that. What it does do is seem to reduce noise because of its dsp filtering.

It is a handy little audio amp, and a filter and it will boost the signals of some of the radios that it is used with. It is not a qrp device, but can be used with some qrp rigs which are lacking in audio output.

These were not expensive devices, so moderate your expectations and you will not be disappointed. I give it 3 stars because it does most of what it says it does and it does it reasonably well for what it costs. I've had mine since I bought it new from Radio Shack and I haven't seen any reason to get rid of it so far.
W5LZ Rating: 3/5 Dec 17, 2013 10:39 Send this review to a friend
Good - but.  Time owned: more than 12 months
I've had more than one of them over the years. You have to keep in mind that this model was one of the first ones out some 30 (?) years ago. It wasn't the -best- at the time but it was available at a lower cost. Is it comparable to later models of DSP filtering? Not hardly, but what do you expect from older models of -anything- much less DSP filters. So depending on what you compare the thing to, call it a '4' or a '3', sort of.
- Paul
VE3TMT Rating: 1/5 Dec 17, 2013 08:01 Send this review to a friend
Waste of money  Time owned: more than 12 months
I really don't think this unit has any DSP capabilities whatsoever. I found the selective filtering on the Yaesu SP6 speaker worked just as well. SSB audio was distorted, and again no DSP noise reduction at all.

Don't waste your money on this one.
W3KC Rating: 5/5 Dec 17, 2013 07:26 Send this review to a friend
Useful Accessory  Time owned: more than 12 months
I use it with my QRP rigs. As a CW filter it cuts noise and adds selectivity. The top firing amplified speaker is a real bonus. Hamfest prices make it a great bargain.
W4KVW Rating: 0/5 Dec 15, 2013 15:53 Send this review to a friend
A BAD JOKE!   Time owned: 0 to 3 months
Don't waste your money.Pure garbage & not even worth the $10 I sold mine for.Buy a REAL DSP unit & save yourself the waste of money & time messing around with it.Buy a ClearSpeech or GAP "Hear It" speaker or inline module & get something that really works.I use one ClearSpeech speaker & one ClearSpeech inline module now & have owned several of the GAP "Hear It" speakers & inline modules & they are almost as good as the ClearSpeech stuff. The DSP 40 is just PURE JUNK at best.Someone should pay you for disposing of it for them. {:>)
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