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Reviews For: Radio Shack DSP 40

Category: Filters, Audio: (DSP and others)

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Review Summary For : Radio Shack DSP 40
Reviews: 40MSRP: 39.95
Description:
Noise reduction system / with built in speaker.
Product is in production
More Info: http://www.radioshack.com
# last 180 days Avg. Rating last 180 days Total reviews Avg. overall rating
00403.5
VE3TMT Rating: 2013-12-17
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: 2013-12-17
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: 2013-12-15
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. {:>)
KB3RMX Rating: 2013-03-13
Ok somewhat Time Owned: 0 to 3 months.
Got this on ebay last week hoping to boost the dsp on my Icom-718. Well it kinda works. Completely distorts audio on ssb even with the DSP off on the radio. Am using LDG IT-100 on radio. Antenna will not tune if you have the DSP in the ON position on the DSP-40. NR does not work at all.

Does work well on cw though. Ok if your just doing cw.
WA7OCZ Rating: 2012-11-18
Auto Notch Feature Time Owned: more than 12 months.
One thing I like about this simple little filter is its ability to auto notch carriers in SSB mode. I was looking to get one to use with my TR7 and didn't realize this would do just that. I find it very handy and quick to switch back and forth. I use it with my FT450D too, which doesn't have the auto notch. I didn't test it on multiple carriers, but usually that's not the case anyway.
KF6GC Rating: 2012-09-05
had my dsp 40 since it was new 15 yrs Time Owned: more than 12 months.
this little dsp is simple and works I USED IT ON OLDER TO NEWER RIGS IC-703 original KW 820 & 830, FT990, FT890, AND IS HELP THEM ALL FILTERED OR NOT YOU CAN'T BEAT IT FOR THE PRICE I paid $30 on sale and would not sell it for any amount of money if I couldn't replace it right now I am using it on the ft990 with all the filtering in that rig you would think it could not be improve but it does
buy one if you can best money I EVER SPENT! FUSE REPLACED ONCE 10 YRS AGO HAVE A SPARE TAPED TO THE TOP IT WILL PROBABLY BE BAD WHEN I NEED IT HI HI AT 74 MAYBE NOT!
VE3NJG Rating: 2012-03-18
Cheap junk Time Owned: more than 12 months.
I first bought two in the early 1990's when they were first launched for $99.00. Yes they do narrow SSB and CW ok with some typical audio change, but are best at nulling out carriers. Their noise reduction part is crappy and useless.
When R.S. discoded them on sale really cheap soon after there was a good reason to get rid of them. If you can only afford $10.00 then buy one. Keep in mind the Time Waves and JPS or also the W9GR units smoke them and do not cost much more used these days. Sorry , but in my view the DSP-40 will never make ham radio history. Really cheap junk, but ok if you are given one for free I suppose. When in doubt about this stuff find an old timer who was there. The British old Datong FL-3 is also a great analogue type audio filter still to this day.
If you worship A R.S. DX-160 or HTX-202 then go get it.
KA4ETV Rating: 2012-03-18
Great for what it costs Time Owned: more than 12 months.
Excellent little filter for what it costs. Agree with the earlier poster. Sometimes good enough is good enough. Buy one if you see it.
K8JHR Rating: 2012-03-18
Good is sometimnes good enough Time Owned: more than 12 months.
The RS DSP-40 is a simple, low cost digital signal processor audio filter. Like other audio filters, it reduces, but does not eliminate noise on the audio output of your receiver or transceiver. It is not as good as a Timewave DSP-zx, but you can generally get one for one tenth of the cost of the Timewave product. No DSP audio filter will cure all noise, but this product helps enough to warrant its typical $40 street price.

There is a mod for increasing audio output volume which is easy to do. I put mine on the SW receiver, and put my Timewave and West Mount Radop DSP filters on my two transceivers.

Sometimes good is good enough for the money - and the DSP-40 is a good product for the money.

Just MY take... // James - K8JHR //

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Earlier 5-star review posted by K8JHR on 2009-01-02

I have two of these RS DSP-40 audio filters and I love them. Definitely worth what I paid for them on eBay. The RadioShack DSP-40 works as advertised - it reduces (cannot eliminate) QRM, hiss and static noise. I use it primarily on SSB, bust I think may be more effective, overall, on CW. It can really help a SW receiver or transceiver that does not have built-in DSP - not better than my TenTec Omni VII DSP... but better than nothing and worth the cost.

I also have a Timewave DSP 599zx and a Timewave DSP 9+ - which are better, but which cost five times more money. Nothing kills all the noise, but this helps and is a good tool and I like using it.

That's MY take...

======== James - K8JHR ========
AE5RC Rating: 2011-12-07
Good, not great,,, Time Owned: more than 12 months.
I have had the DSP 40 since it came out. My intention was to use it with mobile radios. That was not a great experiment so the unit sat on my work desk. Recently I put it in line on an Icom 735. It is better to me inside the shack as opposed to in the car. It is decent on both noise reduction and ssb filtering mode to my ears and that would yield a 3 of 5 rating if that is all it did. On cw it makes the most impact for me. Being a casual operator and not having a whiz bang new radio, the unit is a good addition to my station. Not great (5) but better than simply ok so a 4 of 5 it is. Don't know the going rate for one of these is but if you have an older rig, what can it hurt to try it?

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