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latest user manual PDF

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@ -595,8 +595,19 @@ or the drop-down callsign list at the bottom of the main window) is used
for auto-filling of logging data. This is to avoid confusion (for
instance, if a row in the main window is selected but it’s intended to
log from FreeDV Reporter instead).</p>
<h1 data-number="9" id="freedv-modes"><span
class="header-section-number">9</span> FreeDV Modes</h1>
<h1 data-number="9" id="time-out-timer-tot"><span
class="header-section-number">9</span> Time-Out Timer (TOT)</h1>
<p>FreeDV contains a built-in time-out timer (TOT) that prevents the
radio from transmitting for longer than the configured period. By
default, this is enabled and set to 180 seconds (3 minutes). Fifteen
seconds prior to the timeout firing, a window will appear along with a
beep in your configured speakers or headset to allow you to either reset
the timer or finish up your transmission.</p>
<p>If you desire a different timeout or want to disable the TOT, you can
do so by going to Tools-&gt;Options-&gt;Rig Control and changing the TOT
related options in that tab.</p>
<h1 data-number="10" id="freedv-modes"><span
class="header-section-number">10</span> FreeDV Modes</h1>
<p>The following table is a guide to the different modes, using analog
SSB and Skype as anchors for a rough guide to audio quality:</p>
<table>
@ -677,8 +688,8 @@ use of large Forward Error Correction (FEC) codes. They buffer many
frames of speech, which combined with PC sound card buffering results in
end-to-end latencies of 1-2 seconds. They may take a few seconds to sync
at the start of an over, especially in fading channels.</p>
<h2 data-number="9.1" id="multiple-mode-support"><span
class="header-section-number">9.1</span> Multiple Mode Support</h2>
<h2 data-number="10.1" id="multiple-mode-support"><span
class="header-section-number">10.1</span> Multiple Mode Support</h2>
<p>FreeDV can simultaneously decode the following modes when selected
prior to pushing “Start”:</p>
<ul>
@ -706,8 +717,8 @@ SNR” of 700D and the mode in question; see “FreeDV Modes” below). For
example, the squelch for 700E when the squelch slider is set to -2.0
becomes 1.0dB. This is designed to reduce undesired pops and clicks due
to false decodes.</p>
<h2 data-number="9.2" id="freedv-700d"><span
class="header-section-number">9.2</span> FreeDV 700D</h2>
<h2 data-number="10.2" id="freedv-700d"><span
class="header-section-number">10.2</span> FreeDV 700D</h2>
<p>In mid 2018 FreeDV 700D was released, with a new OFDM modem, powerful
Forward Error Correction (FEC) and optional interleaving. It uses the
same 700 bit/s speech codec as the deprecated 700C mode. It operates at
@ -719,8 +730,8 @@ noise.</p>
+/- 60Hz of the transmit frequency. This is straightforward with modern
radios which are generally accurate to +/-1 Hz, but requires skill and
practice when used with older, VFO based radios.</p>
<h2 data-number="9.3" id="freedv-700e"><span
class="header-section-number">9.3</span> FreeDV 700E</h2>
<h2 data-number="10.3" id="freedv-700e"><span
class="header-section-number">10.3</span> FreeDV 700E</h2>
<p>FreeDV 700E was developed in December 2020 using lessons learned from
on air operation of 700C and 700D. A variant of 700D, it uses a shorter
frame size (80ms) to reduce latency and sync time. It is optimized for
@ -741,8 +752,8 @@ pre-distortion in order to increase the RMS power. Forward error
correction (FEC) will clean up any errors introduced by clipping, and on
poor channels the benefits of increased signal power outweigh the slight
reduction in SNR on good channels.</p>
<h2 data-number="9.4" id="freedv-radev1"><span
class="header-section-number">9.4</span> FreeDV RADEV1</h2>
<h2 data-number="10.4" id="freedv-radev1"><span
class="header-section-number">10.4</span> FreeDV RADEV1</h2>
<p>RADE is a new mode with state-of-the-art performance, it is a
contraction of Radio AutoencoDEr so-named because the modulation
encoding uses a Machine-Learning method where the modulation and
@ -759,10 +770,10 @@ and good resistance to fading and multipath HF radio channels.</p>
<p>When using RADEV1, the squelch settings in the main window are
ignored. Instead, FreeDV only passes decoded audio if it’s able to
synchronize with the incoming signal.</p>
<h1 data-number="10" id="tools-menu"><span
class="header-section-number">10</span> Tools Menu</h1>
<h2 data-number="10.1" id="tools---filter"><span
class="header-section-number">10.1</span> Tools - Filter</h2>
<h1 data-number="11" id="tools-menu"><span
class="header-section-number">11</span> Tools Menu</h1>
<h2 data-number="11.1" id="tools---filter"><span
class="header-section-number">11.1</span> Tools - Filter</h2>
<p>This section describes features on Tools-Filter.</p>
<table>
<colgroup>
@ -800,10 +811,10 @@ settings will display in this window as well.</p>
<li><a href="http://www.rowetel.com/?p=6860">Blog Post on Auto EQ Part
2</a></li>
</ul>
<h2 data-number="10.2" id="tools---options"><span
class="header-section-number">10.2</span> Tools - Options</h2>
<h3 data-number="10.2.1" id="modem-options"><span
class="header-section-number">10.2.1</span> Modem Options</h3>
<h2 data-number="11.2" id="tools---options"><span
class="header-section-number">11.2</span> Tools - Options</h2>
<h3 data-number="11.2.1" id="modem-options"><span
class="header-section-number">11.2.1</span> Modem Options</h3>
<table>
<colgroup>
<col style="width: 28%" />
@ -827,8 +838,8 @@ RMS powers before using!</td>
</tr>
</tbody>
</table>
<h1 data-number="11" id="helping-improve-freedv"><span
class="header-section-number">11</span> Helping Improve FreeDV</h1>
<h1 data-number="12" id="helping-improve-freedv"><span
class="header-section-number">12</span> Helping Improve FreeDV</h1>
<p>If you have an interesting test case, for example:</p>
<ol type="1">
<li>FreeDV working poorly with a particular person or microphone.</li>
@ -845,8 +856,8 @@ anecdotes or subjective reports like “FreeDV doesn’t work”, “SSB is
better”, or “On 23 December it didn’t work well on grid location XYZ”.
With subjective reports problems are impossible to reproduce, cannot be
fixed, and you are unlikely to get the attention of the developers.</p>
<h1 data-number="12" id="multiple-panes-in-gui-window"><span
class="header-section-number">12</span> Multiple Panes in GUI
<h1 data-number="13" id="multiple-panes-in-gui-window"><span
class="header-section-number">13</span> Multiple Panes in GUI
window</h1>
<p>It is possible to have multiple panes opened within the GUI window
for example, to observe both the Waterfall and Spectrum Tabs. New panes
@ -872,10 +883,10 @@ has not been well tested and may have hidden bugs or other issues.</p>
<img src="contrib/multiple_panes.png" alt="Multiple Panes" />
<figcaption aria-hidden="true">Multiple Panes</figcaption>
</figure>
<h1 data-number="13" id="advanceddeveloper-features"><span
class="header-section-number">13</span> Advanced/Developer Features</h1>
<h2 data-number="13.1" id="stats-window"><span
class="header-section-number">13.1</span> Stats Window</h2>
<h1 data-number="14" id="advanceddeveloper-features"><span
class="header-section-number">14</span> Advanced/Developer Features</h1>
<h2 data-number="14.1" id="stats-window"><span
class="header-section-number">14.1</span> Stats Window</h2>
<p>Located on the lower left hand side of the main screen.</p>
<table>
<thead>
@ -920,8 +931,8 @@ modulator (TX) and demodulator (RX) sample clocks. For example if the
transmit station sound card is sampling at 44000 Hz and the receive
station sound card 44001 Hz, the sample clock offset would be
((44000-44001)/44000)*1E6 = 22.7 ppm.</p>
<h2 data-number="13.2" id="timing-delta-tab"><span
class="header-section-number">13.2</span> Timing Delta Tab</h2>
<h2 data-number="14.2" id="timing-delta-tab"><span
class="header-section-number">14.2</span> Timing Delta Tab</h2>
<p>This indicates the symbol timing estimate of the demodulator, in the
range of +/- 0.5 of a symbol. With off air signals this will have a
sawtooth appearance, as the demod tracks the modulator sample clock. The
@ -932,12 +943,12 @@ Offset Bug</a></li>
<li><a href="http://www.rowetel.com/?p=2433">Testing a FDMDV
Modem</a></li>
</ul>
<h2 data-number="13.3" id="sound-card-debug"><span
class="header-section-number">13.3</span> Sound Card Debug</h2>
<h2 data-number="14.3" id="sound-card-debug"><span
class="header-section-number">14.3</span> Sound Card Debug</h2>
<p>These features were added for FreeDV 700D, to help diagnose sound
card issues during development.</p>
<h3 data-number="13.3.1" id="tools---options-dialog"><span
class="header-section-number">13.3.1</span> Tools - Options dialog:</h3>
<h3 data-number="14.3.1" id="tools---options-dialog"><span
class="header-section-number">14.3.1</span> Tools - Options dialog:</h3>
<p>Debug FIFO and PortAudio counters: used for debugging audio problems
on 700D. During beta testing there were problems with break up in the
700D TX and RX audio on Windows.</p>
@ -970,8 +981,8 @@ TX FIFO sending samples to the TX. If this hits zero, your TX audio will
break up and the RX will lose sync. TX audio break up will also occur if
you see “outfifo1” being incremented on the “Fifo” line during TX. Try
increasing the FifoSize.</p>
<h2 data-number="13.4" id="full-duplex-testing-with-loopback"><span
class="header-section-number">13.4</span> Full Duplex Testing with
<h2 data-number="14.4" id="full-duplex-testing-with-loopback"><span
class="header-section-number">14.4</span> Full Duplex Testing with
loopback</h2>
<p>Tools - Options - Half Duplex check box</p>
<p>FreeDV GUI can operate in full duplex mode which is useful for
@ -985,8 +996,8 @@ the sound cards.</p>
In Tools - Audio Config - Receive Tab - From Radio select -&gt; Loopback: Loopback PCM (hw:1,0)
- Transmit Tab - To Radio select -&gt; Loopback: Loopback PCM (hw:1,1)</code></pre>
<h2 data-number="13.5" id="experimental-features"><span
class="header-section-number">13.5</span> Experimental Features</h2>
<h2 data-number="14.5" id="experimental-features"><span
class="header-section-number">14.5</span> Experimental Features</h2>
<p>Occasionally there are some features that may be unstable or
otherwise not ready to officially be released. To experiment with these
features, you can go to Tools-&gt;Options-&gt;Debugging and enable
@ -995,8 +1006,8 @@ enabling this setting, it is recommended to disable it again to verify
that an experimental feature is not causing trouble. (Additionally, if
you’re able to confirm that an experimental feature is causing problems,
please file a bug report!)</p>
<h1 data-number="14" id="tips"><span
class="header-section-number">14</span> Tips</h1>
<h1 data-number="15" id="tips"><span
class="header-section-number">15</span> Tips</h1>
<ol type="1">
<li>The space bar can be used to toggle PTT.</li>
<li>For modes other than RADEV1, you can left click on the main window
@ -1004,10 +1015,10 @@ to adjust tuning. The vertical red line on the frequency scale will show
the current center frequency and FreeDV will automatically track any
drift once it syncs.</li>
</ol>
<h1 data-number="15" id="common-problems"><span
class="header-section-number">15</span> Common Problems</h1>
<h2 data-number="15.1" id="freedv-sets-radio-to-wrong-mode"><span
class="header-section-number">15.1</span> FreeDV Sets Radio To Wrong
<h1 data-number="16" id="common-problems"><span
class="header-section-number">16</span> Common Problems</h1>
<h2 data-number="16.1" id="freedv-sets-radio-to-wrong-mode"><span
class="header-section-number">16.1</span> FreeDV Sets Radio To Wrong
Mode</h2>
<p>By default, FreeDV attempts to set the radio’s mode to DIGU/USB-D (or
LSB equivalent for 40 meters and below). Some radios do not support data
@ -1018,8 +1029,8 @@ LSB modes for rig control instead.</p>
<p>Note that for best results, your radio should have all processing
disabled if you’re using the standard USB/LSB modes. This disabling of
processing typically takes place when using data mode.</p>
<h2 data-number="15.2" id="overdriving-transmit-level"><span
class="header-section-number">15.2</span> Overdriving Transmit
<h2 data-number="16.2" id="overdriving-transmit-level"><span
class="header-section-number">16.2</span> Overdriving Transmit
Level</h2>
<p>This is a very common problem for first time FreeDV users. Adjust
your transmit levels so the ALC is just being nudged. More power is not
@ -1027,9 +1038,9 @@ better with FreeDV. An overdriven signal will have poor SNR at the
receiver. For FreeDV 700D/700E operation with the clipper, make sure
your transmitter can sustain high average power levels without damage
(e.g. 40W RMS on a 100W PEP radio).</p>
<h2 data-number="15.3"
<h2 data-number="16.3"
id="i-cant-set-up-freedv-especially-the-sound-cards"><span
class="header-section-number">15.3</span> I can’t set up FreeDV,
class="header-section-number">16.3</span> I can’t set up FreeDV,
especially the Sound Cards</h2>
<p>This can be challenging the first time around:</p>
<ol type="1">
@ -1039,9 +1050,9 @@ especially the Sound Cards</h2>
mailing list. Be specific about the hardware you have and the exact
nature of your problem.</p></li>
</ol>
<h2 data-number="15.4"
<h2 data-number="16.4"
id="hamlib-does-not-work-with-my-icom-radio"><span
class="header-section-number">15.4</span> Hamlib does not work with my
class="header-section-number">16.4</span> Hamlib does not work with my
Icom radio</h2>
<p>The most common issue with Icom radios is that the CI-V address
configured in FreeDV does not match the address configured in the radio.
@ -1051,9 +1062,9 @@ Transceive” option is enabled on the radio or else the radio will not
respond to requests directed to that address.</p>
<p>On newer radios (e.g. 7300, 7610), you may also need to set “CI-V USB
Echo Back” to ON as this may be set to OFF by default.</p>
<h2 data-number="15.5"
<h2 data-number="16.5"
id="hamlib-seems-not-reliable-on-my-linux-machine"><span
class="header-section-number">15.5</span> Hamlib seems not reliable on
class="header-section-number">16.5</span> Hamlib seems not reliable on
my Linux machine</h2>
<p>Some Linux distributions come with pre-installed software that may
try to use serial ports that your radio creates. You may have problems
@ -1075,9 +1086,9 @@ radio.</p>
<pre><code>sudo systemctl stop ModemManager
sudo systemctl disable ModemManager
sudo systemctl mask ModemManager</code></pre>
<h2 data-number="15.6"
<h2 data-number="16.6"
id="im-using-omnirig-and-have-problems-with-rig-control"><span
class="header-section-number">15.6</span> I’m using OmniRig and have
class="header-section-number">16.6</span> I’m using OmniRig and have
problems with rig control</h2>
<p>If you’re using OmniRig and have problems getting rig control to
work, please attempt to update the INI files for OmniRig. These can be
@ -1085,9 +1096,9 @@ found by going <a href="https://dxatlas.com/Download.asp">here</a> and
clicking on the “INI files for OmniRig” link. There may also be a newer
OmniRig version available at that same link which could work better if
you are running an older version.</p>
<h2 data-number="15.7"
<h2 data-number="16.7"
id="i-need-help-with-my-radio-or-rig-interface"><span
class="header-section-number">15.7</span> I need help with my radio or
class="header-section-number">16.7</span> I need help with my radio or
rig interface</h2>
<p>There are many radios, many computers, and many sound cards. It is
impossible to test them all. Many radios have intricate menus with
@ -1095,8 +1106,8 @@ custom settings. It is unreasonable to expect the authors of FreeDV to
have special knowledge of your exact hardware.</p>
<p>However someone may have worked through the same problem as you. Ask
on the digital voice mailing list.</p>
<h2 data-number="15.8" id="cant-hear-anything-on-receive"><span
class="header-section-number">15.8</span> Can’t hear anything on
<h2 data-number="16.8" id="cant-hear-anything-on-receive"><span
class="header-section-number">16.8</span> Can’t hear anything on
receive</h2>
<p>Many FreeDV modes will not play any audio if there is no valid
signal. You may also have squelch set too high. In some modes the
@ -1104,8 +1115,8 @@ signal. You may also have squelch set too high. In some modes the
from the SSB radio.</p>
<p>Try the Test Wave Files above to get a feel for what a FreeDV signal
looks and sounds like.</p>
<h2 data-number="15.9" id="hearing-myself-whenever-i-transmit"><span
class="header-section-number">15.9</span> Hearing myself whenever I
<h2 data-number="16.9" id="hearing-myself-whenever-i-transmit"><span
class="header-section-number">16.9</span> Hearing myself whenever I
transmit</h2>
<p>Verify audio device settings in FreeDV. If your audio settings are
correct, there are a few other possibilities:</p>
@ -1115,23 +1126,23 @@ devices used with FreeDV.</li>
<li>Turn off TX monitoring (right-click on PTT button and make sure
“Monitor transmitted audio” is unchecked).</li>
</ol>
<h2 data-number="15.10"
<h2 data-number="16.10"
id="the-signal-is-strong-but-freedv-wont-get-sync-and-decode"><span
class="header-section-number">15.10</span> The signal is strong but
class="header-section-number">16.10</span> The signal is strong but
FreeDV won’t get sync and decode</h2>
<p>Do you have the correct sideband? See USB or LSB section.</p>
<p>Is it a FreeDV signal? SSTV uses similar frequencies. To understand
what FreeDV sounds like, see the Test Wave Files section.</p>
<h2 data-number="15.11" id="trouble-getting-sync-with-700d"><span
class="header-section-number">15.11</span> Trouble getting Sync with
<h2 data-number="16.11" id="trouble-getting-sync-with-700d"><span
class="header-section-number">16.11</span> Trouble getting Sync with
700D</h2>
<p>You need to be within +/- 60 Hz on the transmit signal. It helps if
both the TX and RX stations tune to known, exact frequencies such as
exactly 7.177MHz. On channels with fast fading sync may take a few
seconds.</p>
<h2 data-number="15.12"
<h2 data-number="16.12"
id="ptt-doesnt-work.-it-works-with-fldigi-and-other-hamlib-applications."><span
class="header-section-number">15.12</span> PTT doesn’t work. It works
class="header-section-number">16.12</span> PTT doesn’t work. It works
with Fldigi and other Hamlib applications.</h2>
<p>Many people struggle with initial CAT control and PTT setup:</p>
<ol type="1">
@ -1147,9 +1158,9 @@ you a member of the <code>dialout</code> group?</p></li>
hardware, what you have tried, and the exact nature of the
problem.</p></li>
</ol>
<h2 data-number="15.13"
<h2 data-number="16.13"
id="im-on-windows-and-serial-port-ptt-doesnt-work-with-my-usb-to-serial-adapter."><span
class="header-section-number">15.13</span> I’m on Windows and serial
class="header-section-number">16.13</span> I’m on Windows and serial
port PTT doesn’t work with my USB to serial adapter.</h2>
<p>Please verify that you are running the correct drivers for the USB to
serial adapter that you’re using. Information and download links for the
@ -1169,22 +1180,22 @@ for instructions on doing so in Windows 10. For Windows 8:</p>
<li>Check the “automatically get the device app” option, then click Save
changes to save the settings you just chose.</li>
</ol>
<h2 data-number="15.14"
<h2 data-number="16.14"
id="i-installed-a-new-version-and-freedv-stopped-working"><span
class="header-section-number">15.14</span> I installed a new version and
class="header-section-number">16.14</span> I installed a new version and
FreeDV stopped working</h2>
<p>You may need to clean out the previous configuration. Try Tools -
Restore Defaults. Set up your sound cards again with Tools - Audio
Config.</p>
<h2 data-number="15.15" id="freedv-crashes-when-i-press-start"><span
class="header-section-number">15.15</span> FreeDV crashes when I press
<h2 data-number="16.15" id="freedv-crashes-when-i-press-start"><span
class="header-section-number">16.15</span> FreeDV crashes when I press
Start</h2>
<p>Have you removed/changed USB audio devices? If you remove/change USB
audio devices without pressing Tools - Audio Config, FreeDV may crash.
See Changing Audio Devices above.</p>
<h2 data-number="15.16"
<h2 data-number="16.16"
id="freedv-cant-be-opened-on-macos-because-the-developer-cannot-be-verified"><span
class="header-section-number">15.16</span> FreeDV can’t be opened on
class="header-section-number">16.16</span> FreeDV can’t be opened on
macOS because the developer cannot be verified</h2>
<p>From January 2020 Apple is enforcing notarization for all macOS
applications. While official releases of FreeDV are signed, other types
@ -1200,16 +1211,16 @@ execute FreeDV, run the following from Terminal:</p>
<pre><code>xattr -d com.apple.quarantine FreeDV.app</code></pre>
<p>or</p>
<pre><code>xattr -d -r com.apple.quarantine FreeDV.app</code></pre>
<h2 data-number="15.17"
<h2 data-number="16.17"
id="im-on-a-mac-and-my-preferred-audio-device-isnt-appearing"><span
class="header-section-number">15.17</span> I’m on a Mac and my preferred
class="header-section-number">16.17</span> I’m on a Mac and my preferred
audio device isn’t appearing</h2>
<p>macOS has a longstanding issue that prevents certain audio devices
from appearing. More info <a
href="http://www.w1hkj.com/files/fldigi/AppleAudioCodec.html">here</a>.</p>
<h2 data-number="15.18"
<h2 data-number="16.18"
id="freedv-doesnt-preserve-window-positions-on-linux"><span
class="header-section-number">15.18</span> FreeDV doesn’t preserve
class="header-section-number">16.18</span> FreeDV doesn’t preserve
window positions on Linux</h2>
<p>Many Linux distributions are switching away from X11 and towards a
new GUI system known as Wayland. Wayland explicitly does not support
@ -1218,14 +1229,14 @@ compositor to control window positioning. You can force use of X11 via
the Xwayland compatibility layer by adding <code>GDK_BACKEND=x11</code>
to your environment to regain the ability to preserve window positioning
if desired.</p>
<h1 data-number="16" id="converting-this-document-to-pdf"><span
class="header-section-number">16</span> Converting this document to
<h1 data-number="17" id="converting-this-document-to-pdf"><span
class="header-section-number">17</span> Converting this document to
PDF</h1>
<p>For the Linux inclined:</p>
<pre><code>$ pandoc USER_MANUAL.md -o USER_MANUAL.pdf &quot;-fmarkdown-implicit_figures -o&quot; \
--from=markdown -V geometry:margin=.4in --toc --highlight-style=espresso</code></pre>
<h1 data-number="17" id="glossary"><span
class="header-section-number">17</span> Glossary</h1>
<h1 data-number="18" id="glossary"><span
class="header-section-number">18</span> Glossary</h1>
<table>
<colgroup>
<col style="width: 7%" />
@ -1254,10 +1265,10 @@ speech codec bits</td>
</tr>
</tbody>
</table>
<h1 data-number="18" id="release-notes"><span
class="header-section-number">18</span> Release Notes</h1>
<h2 data-number="18.1" id="v2.4.0-tbd-2026"><span
class="header-section-number">18.1</span> V2.4.0 TBD 2026</h2>
<h1 data-number="19" id="release-notes"><span
class="header-section-number">19</span> Release Notes</h1>
<h2 data-number="19.1" id="v2.4.0-tbd-2026"><span
class="header-section-number">19.1</span> V2.4.0 TBD 2026</h2>
<ol type="1">
<li>Bugfixes:
<ul>
@ -1277,6 +1288,7 @@ data-cites="barjac">@barjac</span>!</li>
<li>Enhancements:
<ul>
<li>Add UDP broadcast of received callsigns. (PR #1367)</li>
<li>Add Time-Out Timer (TOT) capability to FreeDV. (PR #1366)</li>
<li>Load last-used config file on restarts. (PR #1365, #1371)</li>
<li>Add “Set tune output to minimum” to Tune button context menu for
safety. (PR #1378) - thanks <span class="citation"
@ -1297,8 +1309,8 @@ class="citation" data-cites="barjac">@barjac</span>!</li>
#1368)</li>
</ul></li>
</ol>
<h2 data-number="18.2" id="v2.3.1-may-2026"><span
class="header-section-number">18.2</span> V2.3.1 May 2026</h2>
<h2 data-number="19.2" id="v2.3.1-may-2026"><span
class="header-section-number">19.2</span> V2.3.1 May 2026</h2>
<ol type="1">
<li>Bugfixes:
<ul>
@ -1332,8 +1344,8 @@ class="citation" data-cites="barjac">@barjac</span>!</li>
<li>Clarify Reporter on/off tooltip. (PR #1345)</li>
</ul></li>
</ol>
<h2 data-number="18.3" id="v2.3.0-may-2026"><span
class="header-section-number">18.3</span> V2.3.0 May 2026</h2>
<h2 data-number="19.3" id="v2.3.0-may-2026"><span
class="header-section-number">19.3</span> V2.3.0 May 2026</h2>
<ol type="1">
<li>Bugfixes:
<ul>
@ -1436,13 +1448,13 @@ thanks <span class="citation" data-cites="barjac">@barjac</span>!</li>
maintenance. (PR #1286, #1307)</li>
</ul></li>
</ol>
<h2 data-number="18.4" id="earlier-than-v2.2.0"><span
class="header-section-number">18.4</span> Earlier than V2.2.0</h2>
<h2 data-number="19.4" id="earlier-than-v2.2.0"><span
class="header-section-number">19.4</span> Earlier than V2.2.0</h2>
<p>See <a
href="https://github.com/drowe67/codec2/blob/master/CHANGELOG_OLD.md">this</a>
for more information about changes in versions prior to 2.2.0.</p>
<h1 data-number="19" id="references"><span
class="header-section-number">19</span> References</h1>
<h1 data-number="20" id="references"><span
class="header-section-number">20</span> References</h1>
<ul>
<li><a href="http://freedv.org">FreeDV Web site</a></li>
<li><a

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