Data Interface

PulsStarInc

Feb 7, 2023

2.1 MB
File Size
Android 2.0+
Android OS

About Data Interface

Test version to decode POCSAG code with an interface circuit conn. to mic -in.

Last changes :

- Full screen

- runtime permission record audio

You will be asked for permission to record audio according to the latest Google guidelines, the user must give runtime permission if the audio jack is used. (Allow record audio.)

If the audio jack is used to decode Pocsag then Android sees this

as Record Audio but nothing is stored on the phone ,it is decoded.

Decode POCSAG

The audio jack is one of the interfaces on mobile devices

and tablets, it's mostly used to play music ,but it can also

be used to receive and decode data.

It can not be connected directly to a receiver, this can damage the receiver/scanner.

A simple circuit is needed to connect a receiver to this audio jack.

( phone/tablet mic-in).

Check also the DataProInterface App it has some more features

see down below.

If POCSAG is decoded most often the unfiltered audio from the

receiver is used (discriminator-output). Some scanners have a discriminator output build in ,but most don't. So if you don't want to crack open your brand new receiver and do some soldering you can try the amplitude decoding mode

which uses the earphone output from your receiver or scanner.

The receivers amplifier has an analogue filter at its output

causing distortion,it seems that the signal collapses

or rises after one bit high or one bit low,this is why it's

so hard to decode with the earphone signal, also each

type receiver has different filters and amplifier so

a standard setting is almost impossible

Another problem is the different specs of the MIC-in circuit

from the different manufacturers of android devices which

results in different amplitude levels when using the same

receiver but different devices.

So after all this how can the right audio level be found.