Add verification report for freedv-ka9q.

Author: tmiw

doc/verification/freedv-ka9q-otac-setup.jpg

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+# RADE Integration Verification Report
+
+## Application Under Test
+
+| Field | Value |
+|---|---|
+| Application name | freedv-ka9q |
+| Application version / git hash | [44f80b3](https://github.com/tmiw/freedv-integrations/pull/15/commits/44f80b3dcbfaae9b0f2ceb8459e1f73cbee1f307) |
+| Platform (OS + version) | Linux (Fedora 44) - kernel 7.0.12-201.fc44.x86_64 |
+| Tester name / callsign | @tmiw |
+| Date | 2026-07-27 |
+| radae repo commit hash | 25d58fe |
+| rade_c repo commit hash | a36161b |
+
+## Signal Path Declaration
+
+- [x] No additional signal processing (AGC, noise gate, resampler, EQ,
+      compression) between WAV file input and RADE encoder input during
+      this verification test
+
+## Baseline Loss (Step 1)
+
+Re-run with the current repository version before filling in this section.
+
+| Field | Value |
+|---|---|
+| Baseline loss | 0.081 |
+| 10% tolerance window | baseline ± 0.0081 |
+
+Command used:
+
+```
+mooneer@fedora:~/radae$ ./build/src/lpcnet_demo -features wav/all.wav features_in.f32
+mooneer@fedora:~/radae$ python3 tx2.py 250725/checkpoints/checkpoint_epoch_200.pth features_in.f32 tx.f32
+...
+mooneer@fedora:~/radae$ python3 rx2.py 250725/checkpoints/checkpoint_epoch_200.pth 250725a_ml_sync tx.f32 features_rx.f32 --quiet
+...
+mooneer@fedora:~/radae$ python3 loss.py features_in.f32 features_rx.f32 --clip_start 100 --clip_end 300
+Loss between features_in.f32 and features_rx.f32
+  loss: 0.081 start: 224 acq_time:  1.24 s
+```
+
+## Level 1 — Software Loopback (mandatory)
+
+- [x] Pass (loss within ±10% of baseline)
+
+| Field | Value |
+|---|---|
+| Loss result | 0.083 |
+
+Command used / reproduction notes:
+
+```
+mooneer@fedora:~/radae$ python3 f32toint16.py --real --scale 16384 < tx.f32 | sox -t s16 -r 8000 -c 1 - tx_real.wav
+mooneer@fedora:~/radae$ cd ~/freedv-integrations/build
+mooneer@fedora:~/freedv-integrations/build$ sox ~/radae/tx_real.wav -t s16 -r 8000 -c 1 - | ./src/ka9q/freedv-ka9q --rx-features rxfeatures.f32 >/dev/null
+mooneer@fedora:~/freedv-integrations/build$ cd ~/radae
+mooneer@fedora:~/radae$ python3 loss.py features_in.f32 ~/freedv-integrations/build/rxfeatures.f32 --clip_start 100 --clip_end 300
+```
+
+(Note: freedv-ka9q is RX only.)
+
+## Level 2 — OTAC: Over The Audio Cable (mandatory for hardware integrations)
+
+- [ ] Pass (loss within ±10% of baseline)
+- [ ] N/A (software-only integration)
+
+| Field | Value |
+|---|---|
+| Loss result | 0.091 |
+| Sound card (Tx) | GeneralPlus USB Audio Device |
+| Sound card (Rx) | GeneralPlus USB Audio Device |
+| Cable description | 3.5mm audio cable, approx. 1m length |
+
+Photo of test setup:
+![](./freedv-ka9q-oatc-setup.jpg)
+
+Reproduction notes:
+
+```
+# Use wpctl status to get correct target IDs for pw-record/pw-play
+
+mooneer@fedora:~/freedv-integrations/build$ pw-record --target 75 --rate 8000 --channels 1 - | ./src/ka9q/freedv-ka9q --rx-features rxfeatures.f32 >/dev/null &
+mooneer@fedora:~/freedv-integrations/build$ pw-play --target 73 ~/radae/tx_real.wav
+
+# Needed to flush rest of audio through pipewire
+mooneer@fedora:~/freedv-integrations/build$ sox -n silence.wav trim 0 10
+mooneer@fedora:~/freedv-integrations/build$ pw-play --target 73 silence.wav 
+
+# Needed to write out feature file and exit freedv-ka9q
+mooneer@fedora:~/freedv-integrations/build$ killall pw-record
+```
+
+## Level 3 — OTC: Over The Coax (optional)
+
+- [ ] Pass (loss within ±10% of baseline)
+- [x] Not performed
+
+| Field | Value |
+|---|---|
+| Loss result | |
+| Tx radio | |
+| Rx radio | |
+| Attenuator(s) | |
+
+Photo of test setup:
+_(attach or link)_
+
+Reproduction notes:
+```
+(paste notes here)
+```
+
+## Summary
+
+| Level | Result |
+|---|---|
+| Level 1 — Software loopback | PASS |
+| Level 2 — OTAC | FAIL |
+| Level 3 — OTC | N/A |
+
+Additional notes: