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--- packet:qtsoundmodem [2023/05/23 14:38] – 2e0sip
+++ packet:qtsoundmodem [2024/04/29 19:31] (current) – Added website link alexswl
@@ Line 1: / Line 1: @@
 ====== QtSoundModem  ======
-**WIP - Don't use until complete**
+Official Website: https://www.cantab.net/users/john.wiseman/Documents/QtSoundModem.html
 QtSoundModem (QtSM) is a multi-platform port of UZ7HO's Sound Modem - a software modem that uses a computer's sound interface to send and receive AX.25 data, known as packet radio. It supports various baud rates from 300 to 4800 baud and modern extensions like FX.25 and IL2P, and if you already have a suitable sound interface and method to trigger a PTT its a quick and easy way of getting started with packet radio without having to invest in a dedicated TNC.
-Note that QtSoundModem only handles the modulation and demodulation of the data. To interact with another packet station you'll need a packet terminal like [[:qttermtcp|QtTermTCP]]
+Note that QtSoundModem only handles the modulation and demodulation of the data. To interact with another packet station you'll need a packet terminal like [[packet:qttermtcp|QtTermTCP]]
 QtSM showing the waterfall and some transmitted packets:
@@ Line 35: / Line 35: @@
 First of all you will need to configure some basics, like which sound interface to use and how to trigger the PTT.
-Go to Settings > Setup Devices
+Go to **Settings** > **Setup Devices**
 Configure the output and input devices - these should be set to the soundcard thats connected to your radio.
@@ Line 44: / Line 44: @@
 {{:packet:qtsm_devices.jpg?direct&400|}}
-===== Setup Modems =====
-==== 1200 Baud AFSK ====
@@ Line 55: / Line 50: @@
 ==== CM108 ====
-The CM108 is a cheap USB sound card that can be [[:cm108_sound_interface_smd|modified] to handle the PTT.
+The CM108 is a cheap USB sound card that can be [[:cm108_sound_interface_smd|modified]] to handle the PTT.
 To get the PTT working you'll first need to grab its ID. To grab the ID, open the Windows Device Manager, expand the ''%%Sound, video and game controllers section%%'' section and find the correct sound interface. Right Click on it, then select properties, then navigate to the ''%%Events%%'' tab. You should see an event for "Device Configured" and clicking on it will show additional information with a long string that looks something like ''%%Device USB\VID_0D8C&PID_0012&MI_00\8&821c4f1&0&0000 was configured.%%''
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 CM108 Device: The ID you obtained from Device Manager. It should look something like 0xD8C:0x12
+===== Setup Modems =====
+Go to **Settings** > **Setup Modems**
+The Modem settings can largely be left as-is, but you may wish to enable FX.25 or IL2P if the other stations you're connecting to support them.
+You may also wish to set **Bits Recovery** to "single" to try and fix corrupted AX.25 frames.
+===== Testing =====
+You can perform a couple of tests to ensure things are setup correctly. Ideally you'll need a second radio on the same frequency to listen to the transmission.
+First off, check the waterfall is displaying something plausible.
+Next, go to the Calibrate menu in the toolbar at the top. Press "Low Tone" for Channel A and you should be able to hear the tone transmitting. If not, check your connections and configuration, especially regarding the PTT settings. Press "Stop Tx" when done.
+{{:packet:qtsm_calibrate.jpg?direct&300|}}
+===== Setting Baud Rate and Tones =====
+==== 1200 Baud AFSK ====
+Baud AFSK is commonly used to access packet radio on 2 metre links.
+In the main QTSM window, set the drop down to "AFSK AX.25 1200bd" and enter "1700" in the box to the right. Each tone will be +/- 500Hz giving you 1200 and 2200 tones commonly used on 1200 baud
+{{:packet:qtsm_1200.jpg?direct&600|}}
+====== Usage ======
+For usage, see the instructions on configuring and using the AGW interface in [[packet:qttermtcp|QtTermTCP]]