Category Archives: Decode

Satellite decoding information

UZ7HO Sound-Modem update

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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 2400 BPSK

UZ7HO Version overview:

SoundModem

  • 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

New UZ7HO Sound modem version

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UZ7HO has released a new version of his great Sound modem software.

UZ7HO Soundmodem

Here is part of the version history file, take a look at this file to get to know al the options.

SCM v0.71b changes:
- Fixed "Frame Collector" operation with MAXFRAME greater than 4 and IPOLL
  frames. By default it supports up to 6 frames into collector's buffer now.
- Added "TXFrmMode" option (that was available in 9k6/19k2 version). It allows
  to select the transmission mode of the frames.

  If set "TXFrmMode=1" then it will repeat only one frame on each of REJ acks.
  It can be useful in poor condition jointly with MAXFRAME up to 4. If another
  station uses a TNC which can operate with "Frame Collector" this option can
  improve a performance, especially on HF.

  If set "TXFrmMode=0" then it will always repeat the block of the frames, of
  which the number is limited by MAXFRAME. It can improve the efficiency in
  good condition. Especially with TNCs without "Frame Collector" function.

  By default this value is "1".

Finally got my PK-96 working

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AEA-PK96PK-96 and TS-2000X

After some debugging and measurements, I finally got my PK-96 working with my Kenwood TS-2000X where I use the TS-2000X ACC2 connector. The problem was that when one uses pin 13 PTT the TX audio from the PK-96 is muted. This pin is normally used for a foot switch and not for an external modem. So after I switched pin 13 to pin 9 on the ACC2 connector everything was working. ISS packet here I come.

Image pin function remark
PK-96-Audio-connector 1 TX audio to radio
2 GND ground
3 PTT push to talk
4 RX audio from radio
5 SQ squelch
Image pin function remark
TS-2000-ACC2 1 RX audio sub radio
2 RTTY key input
3 RX audio main radio
4 GND ground
5 SQ squelch main radio
6 NC not connected
7 SQ squelch sub radio
8 GND ground
9 PTT push to talk, audio not muted
10 NC not connected
11 TX audio in radio
12 GND ground
13 PTT push to talk audio is muted