Radio Modem Signal Strenght Monitor: a program to monitor the strenght of the signal  (connection) of a  Radio (Wireless) Modem

Recently I involved myself in the task to try to connect a modem in an isolated house, far from wireless civilization.
Basically I had to call the only cable phone line
available in the "in the middle of nowhere house" from a laptop. The area was in a wood with a very week, if not null, signal.
I had to:
- find the way to extend the built in antenna of my modem to go around the house looking for the signal (rabdomante phase)
- understand how to built a decent antenna to get the most of the "so to find" signal (rabdomante tool)
- catch the variation of the signal with my erratic moves around the rooms.

This had to be done with a minimal (if not null) expense.

Surfing the web I couldn't find any suitable software (only for Networks wireless adapters, not for Radio Modems - ok, it may be my fault).
In addition I casually faced the challenge of the Napoliwireless site for proving that that the home made parabolic antennas were suitable for mobile phones also (i.e. GSM).
This was for me.
Soon I discarded to buy something in internet because too expensive (50 to 300 €) and too long delivery. Then I discovered that the strenght of a Wireless Router Signal (2.5 GHz) can be easily increased (by almost 12 dBm) with an easy and cheap parabolic antenna made with alluminium foil
(see or a "cantenna" (see scritturaalternativa.blogspot - in italian).
I then found that the GSM frequency is 900 and 1800 MHz (i.e. 0.9 - 1.8 GHz), so no far from the GHz design. Since the frequencies are similar then the antennas can be similar and what is suitable for the Wirelss can be good for GSM. Then I recovered a Digital TV Signal Stilo Antenna (8 cm) and discovered that the frequencies are again similar to the wireless ones.

Now I was needing a good tool for measuring the signal strenght, better that those available in the connection softwares. More precisely
I was looking for a clear numeric display and a proportional acustic sound (with the chocolate inside) to allow me to walk while having an immediate feedback of the strenght of the signal .

Then I decided to write one by myself and this is the bare and simple code resulting from.
The program scans the PC for the available COM ports and relevant attached devices. Then it uses a simple AT+GMM command sento to the modem to get the signal strenght reply, transform in dBm and show it on a big textbox and emits a sound tone whose volume and frequency are proportional to the radio modem signal strenght. In addition it writes a LOG textbox.

Funny to remark that, after of some esperiments, I discovered that the small antenna integrated in the radio modem (removed and replaced with the home made ones) was equivalent to the home made parabolic "aluminium foil" device (see, but at least I was able to walk around looking for the best signal with the antenna only and not the laptop.

At today I still have to go to the "in the middle of nowhere house" to test the sw and the various antenna(s) build, but the most of the fun has already come...Stay tuned...

Later on I will improve this page adding direct links to my discoveries.

Written in PureBasic 4.40 B5 (x86) - (see 
Code and binary are provided FREEWARE. Use and modify at YOUR OWN WISH and RISK.


- Just explode the file in the any folder and run Tracer.exe.

IMPORTANT: This program doesn't make any change to your folders (system or not). It just read the input file and creates the output files where you want

- Just remove the folder(s).

Link Date Description Pictures
Next Development ???? Waiting for comments and suggestions 23-Oct-2009
First Issue (pls report any bugs to the author)