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<h1 id="four-fixed-transmitters-longer-dwell-repeats">Four fixed transmitters: longer dwell repeats</h1>
<p>Same physical MercerMesh fixture and installed firmware as
<a href="../four_fixed_tx_single_pass_validation/">the completed 5.1-symbol run</a>:
RAK4631, Heltec T096, MeshTower V2 and T1000-E fixed transmitters; Heltec V4 RX.
SF10 / BW125 kHz / CR4/5, four channels spaced 1 MHz apart, 32-symbol preamble,
normal SX1262 RX gain, -9 dBm chip TX setting, zero added settling and one
frequency write per hop. No firmware was rebuilt or reflashed for these repeats.</p>
<h2 id="61-symbol-run-user-stopped-incomplete-sample">6.1-symbol run: user-stopped, incomplete sample</h2>
<p>Started 2026-09-14 22:44:47 UTC. Dwell was 49,972 us per channel.
All four stationary controls passed 100/100 again.</p>
<p>The user requested stopping this run and proceeding to 7.7 symbols. The
collector was interrupted only after verifying its PID, command line and owner.
At the last saved checkpoint, <strong>342/348 scored scan packets were received</strong>
(98.28%), with six timeouts:</p>
<table>
<thead>
<tr>
<th>TX / channel</th>
<th style="text-align: right;">Scored attempts</th>
<th style="text-align: right;">Received</th>
<th style="text-align: right;">Timeouts</th>
</tr>
</thead>
<tbody>
<tr>
<td>RAK4631 / 0</td>
<td style="text-align: right;">87</td>
<td style="text-align: right;">87</td>
<td style="text-align: right;">0</td>
</tr>
<tr>
<td>Heltec T096 / 1</td>
<td style="text-align: right;">87</td>
<td style="text-align: right;">86</td>
<td style="text-align: right;">1</td>
</tr>
<tr>
<td>MeshTower V2 / 2</td>
<td style="text-align: right;">87</td>
<td style="text-align: right;">85</td>
<td style="text-align: right;">2</td>
</tr>
<tr>
<td>T1000-E / 3</td>
<td style="text-align: right;">87</td>
<td style="text-align: right;">84</td>
<td style="text-align: right;">3</td>
</tr>
</tbody>
</table>
<p>This is not a completed 400-packet run or a validated full-run timing capture.
An interrupted in-flight packet can exist beyond the last saved checkpoint;
it is not scored as another success or failure. No final switch timing was
collected before reboot. The raw capture remains incomplete, and the separate
user-stop record documents why. All five radios were then independently
verified idle, and ModemManager was restored. Gateway services stayed active;
the V4 memory-soak service stayed inactive.</p>
<ul>
<li><a href="../tools/hil/profile_four_tx_sf10_6p1_results.json">Partial raw capture</a></li>
<li><a href="../tools/hil/profile_four_tx_sf10_6p1_user-stop.json">User stop record</a></li>
<li><a href="../tools/hil/profile_four_tx_sf10_6p1_cleanup.json">Verified cleanup</a></li>
<li><a href="../tools/hil/profile_four_tx_sf10_6p1_launch.json">Run provenance</a></li>
</ul>
<p>Partial raw capture SHA-256:
<code>ad199124930da19fe56c78a4ea8280a6d94b95ef408589b19a9e165155dbf7fd</code>.</p>
<h2 id="77-symbol-run">7.7-symbol run</h2>
<p>Launched 2026-09-14 22:58:14 UTC; collector ran from 22:58:15 to 23:11:45 UTC
with 63,079 us visits. All four fixed-channel controls passed 100/100.
The full scan completed with <strong>395/400 received (98.75%)</strong>, five timeouts and
zero wrong-channel or invalid payloads. Thus <strong>7.7 symbols did not achieve a
400/400 pass</strong>.</p>
<table>
<thead>
<tr>
<th>TX / channel</th>
<th style="text-align: right;">Scanning result</th>
<th style="text-align: right;">Timeouts</th>
<th style="text-align: right;">Mean received RSSI (dBm)</th>
<th style="text-align: right;">Mean received SNR (dB)</th>
</tr>
</thead>
<tbody>
<tr>
<td>RAK4631 / 0</td>
<td style="text-align: right;">100/100</td>
<td style="text-align: right;">0</td>
<td style="text-align: right;">-21.05</td>
<td style="text-align: right;">+8.14</td>
</tr>
<tr>
<td>Heltec T096 / 1</td>
<td style="text-align: right;">99/100</td>
<td style="text-align: right;">1</td>
<td style="text-align: right;">-4.35</td>
<td style="text-align: right;">+8.98</td>
</tr>
<tr>
<td>MeshTower V2 / 2</td>
<td style="text-align: right;">97/100</td>
<td style="text-align: right;">3</td>
<td style="text-align: right;">-44.86</td>
<td style="text-align: right;">+8.63</td>
</tr>
<tr>
<td>T1000-E / 3</td>
<td style="text-align: right;">99/100</td>
<td style="text-align: right;">1</td>
<td style="text-align: right;">-18.56</td>
<td style="text-align: right;">+8.26</td>
</tr>
</tbody>
</table>
<p>All 800 baseline/scan TX sequences were unique, all transmit calls succeeded,
and every TX packet reported zero frequency and modulation configuration writes.
There were zero packet-response transport replays. All four final TX lifetime
checks reported 200 packets and a prepared, non-failed transmitter.</p>
<p>The five timeouts occurred at scan attempts 158 (T1000-E), 184 (T096), and
200, 293, 314 (MeshTower). Each reported RX mode 1 and zero device errors.
Final RX failure, RX-mode-error, cache-error and receive-error counters were zero.</p>
<h3 id="measured-switch-and-sweep-timing">Measured switch and sweep timing</h3>
<table>
<thead>
<tr>
<th>Hop population</th>
<th style="text-align: right;">Count</th>
<th style="text-align: right;">Minimum (us)</th>
<th style="text-align: right;">Mean (us)</th>
<th style="text-align: right;">Maximum (us)</th>
</tr>
</thead>
<tbody>
<tr>
<td>All single-pass switches</td>
<td style="text-align: right;">5,046</td>
<td style="text-align: right;">438</td>
<td style="text-align: right;">524.146</td>
<td style="text-align: right;">804</td>
</tr>
<tr>
<td>Cached modulation; no 0x8B</td>
<td style="text-align: right;">4,651</td>
<td style="text-align: right;">438</td>
<td style="text-align: right;">502.147</td>
<td style="text-align: right;">686</td>
</tr>
<tr>
<td>Post-reception modulation refresh</td>
<td style="text-align: right;">395</td>
<td style="text-align: right;">760</td>
<td style="text-align: right;">783.180</td>
<td style="text-align: right;">804</td>
</tr>
</tbody>
</table>
<p>Exactly 5,046 RF-frequency commands and 5,046 optimized RX resumes were counted,
with one retune pass and zero second passes/detours. The 395 modulation writes
match the 395 post-reception cache refreshes. This is the same cache behavior
as the earlier run, not double-setting the radio. The slightly higher overall
mean than the 5.1 run partly reflects a larger fraction of refresh hops.</p>
<p>Across 860 measured idle cycles, the four-channel sweep averaged <strong>254.351 ms</strong>,
minimum 254.208 ms and maximum <strong>255.482 ms</strong>. Relative to the 262.144 ms
programmed preamble, that leaves 7.793 ms at the mean and 6.662 ms at the maximum.
Nominal dwell was 63.079 ms; measured idle dwell averaged 63.084 ms. Packet-held
visits include payload/guard time and are not comparable to idle cycles.</p>
<p>The 7.7 run received three more packets than the earlier 5.1 run (395 versus
392 out of 400). This small, sequential comparison does not establish a reliable
improvement or a lossless dwell threshold. The 6.1 result is partial and must
not be treated as an equal-size completed comparison.</p>
<h3 id="evidence-and-cleanup">Evidence and cleanup</h3>
<p>Unlike the original 5.1 run's overly strict host assertion, this collector
completed normally with <code>complete: true</code> and exit code 0. Independent offline
validation also passed. The same collector SHA-256 was used for both repeats:
<code>cceb8a570f4aedeaf45d28b4b4590b23df3c1efd490c8e8e9cd74a23ba00024f</code>.
The copied deployment/manifest files are provenance for reused firmware, not
records of a new flash operation. Host options and acknowledged dwell match.</p>
<ul>
<li><a href="../tools/hil/profile_four_tx_sf10_7p7_results.json">Completed raw capture</a></li>
<li><a href="../tools/hil/profile_four_tx_sf10_7p7_validated.json">Validated summary</a></li>
<li><a href="../tools/hil/profile_four_tx_sf10_7p7_launch.json">Run provenance</a></li>
<li><a href="../tools/hil/profile_four_tx_sf10_7p7_cleanup.json">Cleanup readbacks and warnings</a></li>
</ul>
<p>Raw capture SHA-256:
<code>5e3f9a80af1384c3072303428b75c8550ac42d2ac95bd1234bf92cb0aea625e8</code>.</p>
<p>The cleanup wrapper retained three errors from its reboot phase: the T096
primary USB interface was temporarily missing/ambiguous, and attempts to open
the MeshTower/T1000-E ports returned permission denied. Its subsequent final
readbacks nevertheless succeeded for all five radios: each TX was unprepared,
non-failed, packet count zero and autonomous TX disabled; RX scanning was
inactive with zero channels. No further radio access or permission changes
were attempted after those results returned. The wrapper's <code>verified_idle</code>
flag remains <strong>false</strong> because it retains any earlier cleanup error, and the
outer operation returned nonzero for that reason. These warnings happened
after the complete RF sample; they are not counted as RF packet losses or
silently removed from the record.</p>
<p>ModemManager was restored active; gateway services remained active. The V4
memory-soak service remains inactive with test firmware installed. No firmware
restore, commit, push or pull was performed. Previous raw captures are unchanged.</p>
<h2 id="dwell-budget">Dwell budget</h2>
<p>One chirp at SF10/125 lasts 8.192 ms. For the experiment's nominal budget of
one complete four-channel idle sweep inside 32 programmed preamble symbols:</p>
<p><code>maximum dwell symbols = 32 / 4 - switching_ms / 8.192</code>.</p>
<p>The 5.1-symbol run's mean switch (0.513980 ms) gives about 7.937 symbols;
its maximum switch (0.801 ms) gives about 7.902 symbols, before other loop
overhead. These are timing ceilings, not proven lossless dwell limits or a
complete acquisition model. Near the ceiling there is little timing margin.
At 7.7 symbols, four nominal dwell-plus-average-switch intervals total about
254.4 ms, versus a 262.144 ms programmed preamble.</p>
<p>The host keeps the same seed and arrival-randomization rule, spanning about
two nominal scan cycles; absolute arrival pauses therefore scale with dwell.
The fixed-channel controls, sample counts, switching policy and firmware stay
unchanged. As before, external PA/LNA paths and unrelated RF traffic mean this
is a finite bench comparison, not a calibrated sensitivity or interference test.</p>
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