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Tk-830 Speech inversion problem

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N_Georgia

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Dec 31, 2009
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I have a 830 which I can key up a repeater and hear a slight bit of noise in the background. If I turn on the Inversion it lowers the audio being transmited and amplifies the noise turning it into full blown pops and crack. I can turn the inversion on and off during the hang time and clearly see that the faint background noise is being amplified. The farther I get away from the repeater the worst it gets. Why would the chip be amplifiing this?
 

code3cowboy

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Check your connections within the radio, and check your board make sure there is no magic smoke smell.
 

ramal121

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make sure there is no magic smoke smell.
Hate it when that happens.

Actually, my experience with voice inversion is minimal. However, I know that it will make your audio go sideways (highs are lows, lows are highs). Maybe this is raising the noise level as a normal byproduct of the inversion process. Comments?
 

scanfan03

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I've never seen a voice inversion chip do this. The only thing a voice inversion chip does, like someone in an earlier post said, is flip the frequencies of voice. So I have no idea why the chip would be amplifying anything. I can tell no difference from voice inversion on or off excpet the fact that my voice inversion chip makes voice higher because of the frequency of inversion.
 

ramal121

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I'm just thinking, if the scrambler is in the discriminator audio chain, when receiving a scratchy signal, wouldn't it take the high freq component above 3k that would normally be filtered out and flip it to a lower freq that could be heard as crud coming out the speaker? Is there any filtering on the board?
 

powerlineman

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Jul 25, 2005
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My 7180's and 2180's do the same thing. The more noisey the signal is, the more "tinny" it sounds. I also notice when a received carrier drops the reverse burst sounds like a click. I have learned to live with it. It sounds bad enough that I would not want to use the inversion full time.
 

scanfan03

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Do you have the compander on? From my experience voice inversion has worked better on the TK-863G with the compander turned off on every channel.
 
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