速報APP / 工具 / Data Interface

Data Interface

價格:免費

更新日期:2018-04-02

檔案大小:1.1M

目前版本:1.1

版本需求:Android 2.0 以上版本

官方網站:mailto:pulsstarinc@gmail.com

Email:https://github.com/starinc/morse_decoding

聯絡地址:PulsStarInc Medemblik The Netherlands

Data Interface(圖1)-速報App

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.

Data Interface(圖2)-速報App

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

( phone/tablet mic-in).

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.

Data Interface(圖3)-速報App

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

Data Interface(圖4)-速報App

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

Data Interface(圖5)-速報App

receiver but different devices.

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

Well it's been tried with this app with the interface circuit.

This app is a test version there are still some errors in

Data Interface(圖6)-速報App

it, it is used to test if the circuit works on the different devices

but it can decode the POCSAG protocol Function 3 alpha-numeric

most of the time ,however it will not work on some devices.

Data Interface(圖7)-速報App