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You can
write your own review of the GAP HEAR IT Inline Module.
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KE7EJG
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Rating: 5/5
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Dec 19, 2010 07:13
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Excellent for Mobile
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Time owned: more than 12 months
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I have successfully operated mobile for several years using an old Motorola communications speaker AND a Gap hear-it in line audio DSP unit. The Gap module is actually made by BHI in England. I have tried several DSP filters and have kept this one in the car due to it deep DSP noise filter. I use it on SSB with the the pre-amp and rf gain fully on. Only usable for slow speed CW - the FIR filter takes a second or so to "recover". Also, I use it on 2m FM with the squelch fully open. No squlech needed. The Hear-it module has flakey connectors (1/8 in stereo and RCA are both provided). Otherwise I have had great success. Timewave & MFJ products have much less noise reduction but good bandwidth filters. SGC is great for faster CW, it recovers quickly but only has a few selections for bandwidth and depth of noise reduction. FYI, I run run the IC-706 original rev and magmount antennas to NMO connections on the SUV roof. NMO grounds the roof, works well. 10m, 40m and 2m work well for me. I am in the Phoenix area, very noisy. Good luck - Alton, W7ACX
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W8EZI
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Rating: 5/5
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Sep 17, 2010 19:57
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works so well I don't want to work HF without it.
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Time owned: more than 12 months
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I could only repeat the raves this equipment has received. To be completely candid, the plugs don't fit very well. This was complained of by another user. It is easy to forget this because the thing works so damn well. However, the plugs are PCB mounted and not easily changed. The manufacturer would have a perfect product if they could just get decent connectors.
I have a loop antenna on 75 meters on a city lot right in town. This device makes my ragchews sound like FM. Once you use this on SSB, you get spoiled very quickly. I only use SSB so I cannot comment on other modes.
The only other criticism I have is that the output audio could have been made a little higher wattage and you must use a different 12 volt power supply than that used for your transceiver. Otherwise you get audio noise back from your lousdpeaker while transmitting. Figure on getting a good wall transformer to run this thing.
The bottom line is that the basic design is so good that I am willing to accept these shortcomings and would buy another.
Michael
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KC2SCY
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Rating: 3/5
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Sep 19, 2009 13:16
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Works as advertise
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Time owned: 3 to 6 months
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I brought my unit at this years hamfest in Ohio. I could not wait to get home and try it out. First I must say it does work. However the craftsmanship is very poor, connection come lose, the speaker fitting is horrible. If I uses my amp with unit in line I now get feed back through my speaker which I never had before.
otherwise it does as advertise
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W4KVW
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Rating: 5/5
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Jan 27, 2009 16:47
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GOODBYE NOISE!
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Time owned: 0 to 3 months
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Well it's just as I suspected it would be.The GAP "HEAR IT" IN LINE MODULE is just as GREAT as the GAP "HEAR IT" SPEAKER.The floor noise or white noise is NO LONGER a problem when using EITHER the IN LINE MODULE or the DSP speaker.You can even open the squelch on FM & NOT be blown out of the shack from the noise.THANKS AGAIN "GAP" for making 2 meter WEAK SIGNAL operations "FUN" as it should be with your GREAT DSP products!You make my old ICOM 271A "HEAR IT" WITHOUT the noise! }:>)
Clayton
W4KVW
EM80
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KG4EKC
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Rating: 5/5
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Apr 10, 2008 17:55
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Excellent addition for FT 857D
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Time owned: 3 to 6 months
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I really love this device. It makes it so I can hear even weak signals. It has really helped me enjoy HF mobile. It is like listening to FM on HF. I use this module all the time. It really adds to the dsp filters in the 857D. I use this device with a moto speaker and there is volume strength loss but it is quite usable. I'm sure in the higher end radios it would be a waste of money but in this radio it is great.
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N2WUX
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Rating: 5/5
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Apr 4, 2008 15:30
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A very good performer
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Time owned: more than 12 months
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I purchased the unit at the Dayton Hamfest about 3-4 years ago and it works great.It is the perfect partner for my noisy Icom 706MK IIG whose own built-in DSP is very poor.Lately however,the unit was cutting in/out which I attributed to loose/worn connections but it turned out to be the 9.2 Kohm input potentiometer which I was always adjusting.I took the unit apart by removing the 4 rubber feet (the screws are underneath)and replaced the worn pot with 8.2 Kohm and 1Kohm fixed resistors and it worked perfectly.Now I control the input level by simply adjusting the volume control of the radio.I would reccommend this unit to anyone with a " NOISY " radio like my mobil unit !!
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WB9FMC
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Rating: 3/5
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Dec 6, 2007 18:39
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Okay: YMMV
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Time owned: 6 to 12 months
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The bottom line is that it helps some of lower end digital receivers eliminate noise that the radio *may* be exacerbating (see Rob Sherwoods presentation here: http://www.sherweng.com/documents/Dayton2007w.ppt).
These observations are on CW.
When I was using my Yeasu FT-757, it made a very noticeable difference, making copy much easier. But, when I use the Elecraft KX-1 or the Drake R-4C, the amount of signal required (as in audio S/N ratio) to "drive" the processor is at the point where it's already a comfortable copy. And, if you set it to copy a weak signal (at the edge of its capabilities), and that signal fades a bit, the DSP looses it altogether. If you bypass the unit, you'll still hear the signal enough to copy. I'm not sure why this is. It may be a general audio DSP issue.
So, I conclude that while it can help some radios, your millage may vary (YMMV).
kurtt, WB9FMC
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N4VNV
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Rating: 2/5
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Jun 13, 2007 07:39
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POOR QUALITY
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Time owned: 6 to 12 months
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I found the GAP DNR module to be poor quality material. The plastic fuse holder body, broke into pieces in my hand when I took it out of the box. It's really an inferior grade of plastic. And the plug-in cables fit very poorly and won't maintain connection. Contact is broken by the least vibration, i.e. people walking by the rig.
WHEN it's working, it does a good job!
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W4CAS
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Rating: 5/5
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Jan 25, 2007 06:07
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What a great accessory!
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Time owned: 3 to 6 months
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I have had my GAP inline module for about 4 months and my only question is, why didn't I buy one sooner? This unit works at least as well as advertised, maybe better! Depending on band conditions and noise levels, I never have to use a noise reduction setting above 3 or 4. Anything above 4 gives the audio a "watery" sound like you are listening through a hydrophone on the ocean bottom - but I'm sure there might be some conditions that warrent the use of higher processing levels. The only things I could find fault with are the smallish knobs (but I'm ham-handed...no pun intended!) and the somewhat awkward layout of the module. Seems like they could have designed a box with all the controls on the front and all the inputs, outputs and power connections on the back - but maybe I'm being too picky! And maybe a future model could include an automatic notch filter. But beyond my overly critical comments, this is truly a fantastic accessory!
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KG6R
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Rating: 5/5
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Sep 16, 2006 11:58
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Terrific
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Time owned: 6 to 12 months
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I have used the gap "Hear It" inline module for six months with my ft-840 and ft-897d. The noise reduction is terrific and I use it more often than not. Once I purchased the ft-897d (with DSP), I thought that I would not use the GAP module except with the ft-840. Wellllll I was wrong. With the GAP and the dsp in the ft-897d turned on, the difference is amazing. I highly recommend this product wether you plan on using it with boat anchors or improving the noise reduction with a radio equipped with dsp.
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