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- Packet Radio Monitor v1.20
-
- New features in respect to version 1.00
- 1. Packets are being sorted out according to source
- and destination address. As the result data
- streams exchanged by packet stations can be reconstructed.
- 2. "On line" tuning indicator - especially needed in HF mode.
-
- To monitor packet radio traffic you need:
- 1. Radio receiver.
- 2. HamComm (or similar) interface.
- 3. This program
- 4. IBM PC/AT compatible - a fast one...
-
- When you start PKTMON it asks you for:
- 1. COM port the HamComm interface is connected to.
- Possible choices are COM1 and COM2.
- 2. Mode: HF or VHF (800 or 1000 Hz deviation) packet.
- 3. Whether to log bad CRC frames or not.
- Even when logged, frames with bad CRC are not considered
- for data streams reconstructions.
- 4. File name for unsorted packet log (press <return> for screen log)
- 5. File name for sorted log. Here you give the file name
- but without extension. PKTMON creates several files with extensions
- .0, .1, .2, etc. Each file carries the data stream between two stations.
- .oth file stores uncategoried frames that is beacons and UI packets.
- If you respond with just <return> the traffic sorting will be disabled.
-
- After you answer the above questions PKTMON decodes (or at least attempts
- to decode) incoming packets. To stop it press <return>.
-
- Tuning indicator consists of two parts: amplitude display on the left
- and tuning display on the right. When you tune in HF receiver
- look at amplitude and try to make it as high as possible.
- Usually it shows 6-7 when packet signal is being heard
- ans 2-3 when there is only noise. You need to tune slowly and precise
- and when you find where the maximum is you should already see
- packets being decoded. Use the right display for fine tuning
- in 10 Hz steps.
- If the tuning indicator does not appear or it is being updated
- only rarely it means that your PC is too slow.
-
- In HF mode the input signal should be centered at 700 Hz.
- The intention was to use CW narrow filter of about 500 Hz width.
- However the FM demodulator will accept as well other center frequencies:
- 900, 1100, 1300, ... in 200 Hz steps but the higher the frequency the higher
- interrupt load so your PC may run out of CPU...
-
- The program should terminate when you press ENTER.
- If it does not that is an indication that your PC is too slow...
- Disconnect the audio and it will terminate.
-
- What to do if your PC is slow indeed ? Try to use squelch
- in FM mode to limit the amount of data your PC has to process.
-
- PKTMON is written in Turbo Pascal v6.0
- with some parts in Pascal's built-in assembler.
- I tested it on 386/SX 20 MHz machine.
-
- If you need some other AFSK packet modes tell me
- what are the center frequencies, deviations and bit rates.
- I try to incorporate them into PKTMON.
-
- Pawel Jalocha
- Rynek Kleparski 14/7
- PL-31150 Krakow (Poland)
-
- e-mail: jalocha@chopin.ifj.edu.pl
- jalocha@vxcern.cern.ch
- jalocha@priam.cern.ch
-
-
- p.s. PKTMON is free for non-comercial use.
-
-