UZ7HO Sound-Modem update

UZ7HO has again updated his Sound-Modem software. Below a part of the latest changes. With the current 2400 BPSK experiments on QB50p2 this version is a great improvement to decode these QP50p2 telemetry 2400 data.

High-Speed SoundModem v0.03b changes:
- Changed LPF filter in HAPN 4800 baud mode.
- Little code optimization.
- Fixed some minor bugs.

SoundModem v0.80b changes:
- Added new BPSK 2400 baud modem.
- Little code optimization.
- Fixed some minor bugs.

2400 baud BPSK QB50p2 IQ replay and the new Sound-Modem software

UZ7HO Version overview:


  • AFSK 300, 600, 1200, 2400 baud.
  • (D)BPSK 300, 600, 1200, 2400 baud.
  • (D)QPSK 2400, 3600, 4800 baud.
High-Speed SoundModem

  • G3RUH 9600, 19200 baud.
  • Manchester 1200, 2400, 3600, 7200 baud.
  • HAPN 4800 baud.

UZ7HO download page

2 thoughts on “UZ7HO Sound-Modem update

  1. Hello. I have tried the new version of Soundmodem on the QB50p1 satellite and it´s receiving very well. But, I can not get a decoding, I only get “NOX AX.25” message. Do you have any information how to setup Soundmodem to get a KISS decoding just like the Warbler software?
    Lars Thunberg SM0TGU

  2. Hello Lars,

    Nice to see that you are trying to decode the QB50 satellites.

    You mis one thing. The Sound-Modem is also sending kiss data to a tcp port
    default tcp/8000 so you need to use an extra software program to decode the
    kiss data. On the website from DK3WN ( you can find AGW ONLINE KISS this software connects to UZ7HO and will display the decoded data. So you need the following:

    RX -> UZ7HO -> AGW ONLINE KISS = decoded data. I hope this will help you in decoding the data.

    73 Jan PE0SAT

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