- Amateur Radio (Ham Radio) Community

Call Search

New to Ham Radio?
My Profile

Friends Remembered
Survey Question

DX Cluster Spots

Ham Exams
Ham Links
List Archives
News Articles
Product Reviews
QSL Managers

Site Info
eHam Help (FAQ)
Support the site
The eHam Team
Advertising Info
Vision Statement

Reviews Categories | Filters, Audio: (DSP and others) | Gap Hear It Module inline DSP filter Help

Reviews Summary for Gap Hear It Module inline DSP filter
Gap Hear It Module inline DSP filter Reviews: 11 Average rating: 4.6/5 MSRP: $200
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
Product is in production.
More info:
Email Subscription
You are not subscribed to this review.

My Subscriptions
Subscriptions Help

You can write your own review of the Gap Hear It Module inline DSP filter.

<— Page 2 of 2

BEEN Rating: 4/5 Mar 13, 2005 02:37 Send this review to a friend
Potentially superb clean-up of audio in signals.  Time owned: 6 to 12 months
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.
<— Page 2 of 2

If you have any questions, problems, or suggestions about Reviews, please email your Reviews Manager.