[GreenKeys] Bell 103 demodulator?

[Suhayl Khan]

Hi Eugene,

I built the following circuit this morning:

http://imageupper.com/i/?S0200010060011H141072536787361

Following the instructions found here:
http://colinfahey.com/phone_interface/phone_interface.html

I then connected a Bell 103 compliant modem (0-300 baud) to a bit rate
converter configured for 266-N-7-1, and a PC to the other end of the
converter.

Next I dialed into the modem [set to Originate] and played the wav file to
the modem using the circuit I constructed above. Below are some of the
results [I needed to increase the volume of the wav file multiple times to
get the Carrier Detect light to come on the modem so this may have
introduced some error]:

{lbCdEFJk@[]\N}tHaS at iS@A at teSt@for at tHe@fglSS at At
@GqtBurt at MeetfjCCCfHoHfRrxmtwBl~}N\MK at JcFEdCb\{

{lbCdEFJk at KM\N}tHqS at iS@Q at teSt@for at tHu@folKS at Qt
@GilRurt at MuetfjCCCfHoHvRrxmtwRl~}N\MK at JkFEdCbl{

{lbCdEFJk@[M\N}tHaS at iS@A at teSt@for at tHe@fol[S at At
@GqlBurt at MuetfjCCCfHoHvRrxmtwRl~}N\MK at JcBEdCb\{

I am curious to know what the original text is...?

Are you able to record it again but louder (e.g. mic gain set higher, mic
closer to speaker...) ?

Thank you

Regards,

Suhayl Khan


On Fri, Sep 12, 2014 at 11:36 PM, W2HX <w2hx at w2hx.com> wrote:

> Hello folks,
>
>
>
> I have an audio file (wav) that I have been told represents data in the
> following audio format:  Bell 103 data, 266.6 baud, 850 shift, 1300/2100
> tones
>
> Does anyone know what software can be used to decode this? I am posting it
> here in case it helps figure this out.  Thank you all.
>
>
>
> http://www.w2hx.com/x/PRC-319/
>
>
>
>
>
> 73 Eugene W2HX
>
>
>
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