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write your own review of the Radio Shack DSP 40.
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W6EOD
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Rating: 4/5
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Apr 4, 2009 11:55
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For the price...
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Time owned: 0 to 3 months
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For the price you pay it is great. For CW work it is great and better than no filter or 100+ dollars toward a IF filter.
The fact that is has a built in speaker is an added bonus which eliminates buying a speaker to complete the package.
I have no idea how it works on SSB as I don't operate that mode very often.
If you find one at a hamfest and have a need, buy it. Its worth it.
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5R8GQ
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Rating: 4/5
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Feb 27, 2009 12:53
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Excellent for the money
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Time owned: more than 12 months
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This is a super little discontinued inexpensive unit that you can find at flea markets and on Ebay. It is great for using with homebrew rigs and QRP kit rigs. Noise reduction is not so hot, but the filters are good, especially for CW and use with PSK31 (SSB). If you see one...just get it! You'll find a use for it and you'll be glad you did. If even for extra added audio punch for that QRP rig that uses headphones.
Addendum to my review:
Here's a link for this unit for lots of great Mods, Schematics, Operating Manual, etc. Enjoy!
(Scroll to lower part of page for the various links, Separate links for manual, mods, schematic, etc)
http://www.geocities.com/n2cbu/
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RN3AKK
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Rating: 5/5
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Jan 14, 2009 00:39
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good
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Time owned: 0 to 3 months
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I have similar Realistic 21-543
Very good job for low price. Highly reccomended
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K8JHR
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Rating: 5/5
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Jan 2, 2009 09:38
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Worth the Price for Sure
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Time owned: more than 12 months
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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 ========
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WD9FRF
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Rating: 3/5
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Oct 26, 2008 14:34
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Works for me!
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Time owned: more than 12 months
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Is it a match for the DSP in my IC-746PRO transceiver? Of course not. But then again did you really expect it to be.
Is it a match for the MFJ-784B Tunable DSP Filter attached to my TenTec Argosy? Nope, sure isn't! But I never expected it to be.
Does it make a difficult QSO on my faithful old HW-8 a bit better? Darned right it does!
That made it worth the 35 bucks I paid for, and then some.
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N8EB
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Rating: 5/5
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May 15, 2008 04:33
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For what it is...
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Time owned: more than 12 months
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Someone else already said it - For the price...
Is it as good as the modern DSP installed inside your rig? No, but for the price...
If you have an older rig with no DSP option, you just can't beat it - for the price...
A bunch of us take mobile HF rigs, mount them in a picnic cooler, throw a wire in a tree at the local Metro Park, and power everything off a deep cyle battery for an afternoon of playing radio.
In a cooler it is hard to hear most internal rig speakers, so we use an external speaker, and when you use the R/S DSP for both noise reduction and volume control (do the mod), you just can't beat this combo! Especially for the price...
Most people say that this DSP is better at CW than SSB, but I use it for phone and works out OK, especially for the price!
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NU0C
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Rating: 5/5
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Mar 29, 2008 16:54
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You get what you pay for
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Time owned: more than 12 months
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If anyone else wants to throw theirs in the trash, send it to me instead! I'll pay shipping. The DSP-40 perfroms as advertised, it is a basic noise reduction system. If you want Timewave performance, you need to buy a Timewave. If you are happy with a low cost, low end system, the DSP-40 fits the bill. I think this is where a lot of hams were disappointed, they expected this box to be more than it was.
I own three of these, and plan to acquire more as they present themselves. I used one extensively for Mode A satellite on the RS birds back in the day, on my TR-7. It did exactly what I needed it to, remove high frequency hiss from the headphone audio and make weak satellite signals more readable. Testing with the first unit on my Radio Shack DX-400 shortwave receiver made SSB signals on the low bands copyable that were not copyable without the unit. Not that I use the DX-400 regularly for SSB work, it really doesn't have the selectivity to be effective - but it was a good test.
In summary, I'm completely satisfied with the performance of the DSP-40 as a low-end DSP unit. There's also a published mod on the internet to increase the audio output level. I haven't tried it out yet, but I plan to when I get things organized again.
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WB4M
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Rating: 2/5
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Dec 4, 2007 14:49
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Better than nothing at all.
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Time owned: more than 12 months
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I had all but forgotten about owning one of these "filters" until I read the latest review of it. The best thing I can say about it is that it beats no filter at all. It never once was better or equal to any rig's built-in filters or noise reduction aids. I put it away in a filing cabinet, only later to just toss it in the trash. RS to me is pretty much on the same level as MFJ.
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OE3SGU
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Rating: 4/5
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Dec 4, 2007 12:29
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good value for the money
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Time owned: 0 to 3 months
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received my item via ebay a few days ago. performance on cw is excellent for the price, noise reduction is not too effective. great add on for qrp rigs! anyone has a manual? oe3sgu@utanet.at
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ONAIR
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Rating: 4/5
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Dec 1, 2007 19:22
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Had one for years.
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Time owned: more than 12 months
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Bought one of these on sale at RS around 10 years ago. Not the greatest, but it has helped make quite a few noisy signals readable over the years.
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