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After a few day of observation between foxdig and foxview  i noticed that foxview had the ability to diplay many more beacons comming from weak signal,  foxdigi could not  ( other tracker i own could not decode too : tynitrak4, Opentraker+ ).

So i noticed that the MX614 modem chip had a geat sensitivity and could decode very weaks signals.

My idea was to use  the outpout of the MX614 ( used by Foxview )  to feed the PIC16F88  ( Used By fox Digi ),  as all the componets are on the same board on the Foxview3.
(use of  PIC16F88 RB4 input line for decoding beacons to replace the embedded comparator but less efiscient of the PIC16F88  )

After a few day of studying the Original Asm  file From Bob Ball WB8WGA uses in Foxdigi  i made a very  little modification  to the original one:

-For software just  burn the new asm ( which in fact just toogle bit and set tone using interupt and TTL Level on RB4 )

-For Hardware:Just cut the track from  RB4  ( PIN10)  to RA3 (pin2 ) of the PIC16F88 and link the same  RB4  to RXD ( Pin 13 ) of  MX614:




And now My fox digi as a great sensitivity and so can decode all the beacons as Foxview does, as they are now sharing the same decoder chip the MX614
now we have a very sensitive aprs viewer and Digipeater :)


After a few day it is really working great and receive much more beacon than before on my foxdigi.


Benoit


the PIC16F88  modified .hex  and asm file  for 4800 baud  for 9600 baud

link to free MPASM download to compil you own program for PIC or local download here


thanks  for people giving too the community open source Software

73 's
Benoit France


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