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Old 10-13-2008, 06:02 AM
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Ok, Simple fix for frequency expansion.
Just build a new oscillator like the one at TR-20.
Add a 15.810 for high and a 14.910 for low.
This can be done on one board.

And there you go.

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Old 11-15-2008, 05:10 PM
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the chip has a differant number but it is the same as upd2816

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Old 11-19-2008, 07:12 PM
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For any future radio purchases I would avoid anything that says SOUNDTRACKER. They are built sub-par compared to older 29's and 25's. I have seen them referred to as Soundcrappers, I'm sure they earned this nickname for a reason.

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Old 04-27-2009, 08:42 AM
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is there a way to disable the sound tracker?

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Old 12-03-2010, 04:09 PM
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Wondering if anyone can help me. I am reading these post and understanding some of it. But the queation I have is how I can hear other truckers better.

I have the cobra 29wxnw soundtracker came stock with the truck from Western Star.

I have hear people say they have "motherboard"? and you can hear them from a couple KM away.

How far should away should be normal to hear other Truckers?


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Old 12-03-2010, 07:38 PM
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Hi all yes the soundcrapper can be disabled. Go to the cobra site if ya cant find it. I have it printed out ill have to find it, Ben

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Old 12-05-2010, 01:58 AM
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I have to ask a dumb question. What exactly does the sound tracker button do anyway? I have a little cobra 25 with sound tracker and when i press the button i dont really notice any difference at all!

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Old 12-05-2010, 02:32 PM
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ok, taz's question first, because he posted first.

average mobile to mobile range for barefoot (no linear amplifier) radios is around 5-20 miles, depending greatly on your antenna setup.

if you want to hear others better, and for that matter, reach out further; your antenna system is the place to start making improvements.
dont buy cheap off brand antennas, and mount it up high on your vehicle.
yes, many variables there, but searching around this forum should give you some good suggestions.

i dont know what "motherboard" is, but you should be able to hear people from a couple of kilometers away with no problem whatsoever using just a stock CB radio.

Skyrider, soundtracker is a marketing ploy used by cobra to get unsuspecting buyers to choose their radios over the unidens and midlands that are sold right next to them.

the concept behind it is called "companding" which is a mash up of the words compressing and expanding.
the idea is that when you add compression to your mic audio, it will give your voice more punch, allowing you to be heard over the noise.
the expansion is on the receive end, where your receiver "expands" the audio coming in that has been compressed, and allows you to hear that station over others that arent running compression in their mic audio.

there are two things about this that cobra fails to mention. first, BOTH the receiving radio and the transmitting radio have to be using the soundtracker feature for it to have any benefit whatsoever. pretty lame eh?

the second thing they dont tell you is that it doesnt work very well even in the rare case where both radios are using the soundtracker feature.

the "companding" concept got big in the early 80's and was planned for use in the telephone industry.
radio people borrowed the idea and tried applying it to radio comms.
Selman Enterprises (the Secret CB people) used to sell a kit called the VSB-1
(Voice Signal Booster) and if you read their advertisements for it; you would have thought you could hear someone on the moon with it. LOL

the idea just never caught on, and i for one am very glad it did not.
if it did, pretty much all major branded CB's would have that "feature".

most people just never turn it on. some of us will remove it from the radio completely and use the button for something useful.
i have heard people say that radios that came with the soundtracker feature sound better with it removed than just with it off, but i have not had an opportunity to confirm or deny this.


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