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[aprssig] Fill-in Digis

Wes Johnston wes at kd4rdb.com
Sun Mar 26 00:22:50 UTC 2006


I haven't have any troubles with the kpc3 plus mute function.  Works like a champ, even on the quickest (10ms) setting.

Wes

> I've had the same experience.  The TNC2, no matter what kind of enhanced 
> DCD is added,  is useless for Mic-E-on-voice-repeater  applications.  It 
> simply false-detects on voice peaks and DTMF signaling constantly.  
> 
> Oddly one brute-force approach to DCD, borrowed from the past works 
> fairly well.   I built a high-Q passive single tone filter using  a 
> tuned circuit made of a classic 88mH toroid and styrene capacitors, in 
> the style of early RTTY terminal units.  I resonated the toroid at 1200 
> Hz, yielding a bandwidth narrow enough that only the low tone of a 
> packet burst had significant energy within the passband. Voice energy 
> and DTMF were ignored completely.    Total parts:   1 88mH toroid, two 
> styrene or mylar caps, an LM324 op-amp, three resistors and a diode.   
> 
> 
> 
> 
> 
> 
> 
> Stephen H. Smith    wa8lmf (at) aol.com
> EchoLink Node:      14400    [Think bottom of the 2M band]
> Home Page:          http://wa8lmf.com
> 
> NEW!    UI-View Misc Notes and FAQ
>   http://webs.lanset.com/wa8lmf/aprs/UIview_Notes.htm
> 
> "APRS 101"  Explanation of APRS Path Selection & Digipeating
>   http://webs.lanset.com/wa8lmf/DigiPaths
> 
> Updated "Rev G" APRS            http://webs.lanset.com/wa8lmf/aprs
> Symbols Set for UI-View,
> UIpoint and APRSplus:
> 
> 
> 
> 
> 
> 
> _______________________________________________
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> 





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