My personnal Digi Fill-In

English

Following the publication of an article which after all could seem trivial on Linux distributions that could boot from a USB stick by F4EED, I started leading me to configure a Linux PC. And in the process, I wanted to test the APRS because a priori, I was in possession of all the hardware and software allowing me to make and receive APRS:

  • a VHF FM transceiver (FT-857D my serve me for the experience and ultimately the TM-G707E will take over for the final installation)
  • an audio interface connected to the PC sound card
  • a VHF antenna (May 1 DK7ZB elements of OM manufacture)
  • a power supply
  • a computer

The Linux distribution selected is the one I know best, UBUNTU. And the software used is Xastir.

Unfortunately, I was faced with the difficulty of setting the soundmodem and after having spent several hours trying to configure it, I decided to put my experience Linux side.

So I folded on the main PC radio shack, in this case my HP Workstation with Windows 7. I knew the interface connected to my sound card was functional to try.

After some research on the net to assess the best APRS application, I chose UI-VIEW 32 bits. And as I don't have a TNC, I have to install AGWPE who will make the link between UI-VIEW and my sound card.

Then comes the most difficult time, setting the applications. For that, I helped myself to various documents on the web, including:

In parallel, I asked myself the question : what I bring as a contribution to APRS network ?

It turns out that after several observations on aprs.fi APRS network, I realized me that between Saint-Etienne and Lyon the network was dense enough, as in the Rhone Alps in general. By cons, between Saint-Etienne and the Haute-Loire, I think there may be a need to improve the network, I let you judge:

That's why I directed my 5 elements on VHF azimuth 225 °, roughly towards the Puy en Velay. Furthermore, I took advantage of the Internet connection of shack to make this digipeater a RGate, ie collect the APRS RF local traffic to the global APRS-IS server.

Here the theoretical coverage (obtained through Radiomobile) :

 

So I can now appear on the site of aprs.fi :

 

By clicking on the icon of digi, details are obtained :

 

And after a month of presence on the air almost every day :

 

The number of stations heard directly has increased recently when the Digipeater became an "Igate".

Now it remains to analyze these results and we start to talk with the OM of the merits of the approach sector and further action. What is certain is that our region, business remains quite poor but who knows, it can surely arouse desires and ideas to go further.

Personally, the next step is to dedicate this work to my Kenwwod TM-G707E with TNC connected my PC to either a Linux or a Raspberry Pi to make it an autonomous station.

In a future article, I will detail the various UI-View settings to help you do the same.

 
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