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| Reviews Summary for Gap Hear It Module inline DSP filter |
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Reviews: 4
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Average rating: 4.2/5
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MSRP: $200
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Description: An inline filter with up to -20dB of noise attenuation selectable at 8 levels, using state-of-the-art, fully adaptive, active DSP to remove unwanted background noise. This results in improved clarity, absence of noise , greater readability, easier to understand audio. It features an 8 step sensitivity control knob. Audio input and output is via 3.5 mm mono mini jacks or RCA phone. There is also a headphone socket. This device requires 12 to 24 VDC at 500 ma. It is supplied with a mini to mini (3.5mm to 3.5mm) audio cable and fused power lead
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More info: http://www.universal-radio.com/catalog/filters/4048.html
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write your own review of the Gap Hear It Module inline DSP filter.
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W4HKL
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Rating: 5/5
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Jun 10, 2009 11:42
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Does what it's supposed to do
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Time owned: more than 12 months
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A great addition to an older rig or a newer one without DSP (Alinco DX-70, for example.) The filtering takes place at the AF level, but it's still good and the difference in audio quality is like night and day - without all the white noise and hiss.
I have no problem recommending this unit and plan on buying the internal DSP unit they sell to place in a Kenwood TS-50 to update it with DSP.
All in all, a great device that has magnified my amateur radio experience tremendously.
ps. I use a SGC external speaker with AF (audio frequency) DSP with my DX-70 in the mobile - again, without the hiss and white noise my radio experience has been improved a great deal. If you're not using DSP and are a casual SSB operator, you don't know what you're missing.
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VE3LNY
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Rating: 3/5
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Sep 24, 2007 16:53
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A little disappointed
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Time owned: 3 to 6 months
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I bought one of these in Dayton this year so I've been using it for about 5 months now. I don't disagree with the above reviews, but I have not found the noise reduction all that satisfactory. The reason I bought the unit was to improve copy on weak signals on 80M. Perhaps I'm asking too much, but on weak signals the performance is marginal. It works fine on stronger signals, but for those I don't need it all that much.
I also find that the price is a bit high for what you get. I opened the case and there's not much inside, just a tiny circuit board. The operation of the buttons is confusing and inconvenient, and the buttons are too tiny. Finally, it is inconvenient switching from speaker to headphones.
This unit needs a rotary switch to select the DSP level so you know what it is set at, and a larger button or switch to turn it on and off. It also needs a headphone jack on the front so you don't have to unplug the speaker.
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NN5G
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Rating: 5/5
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May 15, 2007 06:04
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A Very Useful Tool!!!
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Time owned: 0 to 3 months
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I have tried similar products in the past with limited success. However, the Gap Hear It Module inline DSP filter is a winner. I have purchased other products from GAP and have been quite pleased with all of them. I have found this item to be invaluable in hearing signals I otherwise would not hear. It seems to eliminate atmospheric noise and is even helpful with lightning crashes. Some have mentioned a "watery" sound when the unit is used at higher gain values and that is true, but you are still allowed to hear a signal that you would not hear otherwise. So, would you rather hear the signal with the “sound”, or not at all?
I have had a few of my ham friends try the Gap Hear It Module and they are amazed at how effective it is…. 73 de Paul, NN5G
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BEEN
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Rating: 4/5
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Mar 13, 2005 02:37
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Potentially superb clean-up of audio in signals.
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Time owned: 6 to 12 months
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This is by far the best DSP filter I have ever used. It is, however not perfect. It makes operation in a high QRM area easier / possible, and is the only filter that effectively deals with power-line noise.
Pros: Small efficient and cost effective
Variable processing levels, works with any radio and any speaker combination
Multiple connection possibilities and variable output levels to get a good volume match.
Automatic throughput when power lost or turned off.
Cons: The sockets for audio and power connections are badly placed, and make location of the unit problematic.
At higher levels of processing there is a very irritating "burble of water" sound superimposed on the heard signal. I find I need at these times to also use a DSP 9 filter to remove the burble.
Neutral: It is difficult to accurately tune an SSB signal with the filter on, but not imppossible. This filter isn't going to insert what isn't there initially, but it is the best method of deleting hash / white noise / power line interference and all. It allows me to copy signals that won't move the strength meter at all.
Overall: I wouldn't be without this filter, and use it often. Redesign the inputs, and do something about the burble, and this would be an award winner.
The 2 second delay that applies to the speaker version doesn't apply here, change-over is a fraction of a second only.
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