Organize test results and historical release docs
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# Double center-frequency write: V4 transmitter / XIAO receiver
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# Document moved
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2026-09-14. **Completed bounded comparison: neither single nor duplicate
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frequency writes reached 400/400. The duplicate adds about 86 us per hop.**
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No production default was changed. Both radios are idle with HIL installed;
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the duplicate-write toggle is off. The earlier descending-SF sweep and its
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follow-up remain paused; no new exhaustive settling sweep was launched.
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<script>window.location.replace(new URL("../test-results/double_frequency_v4_validation/" + window.location.hash, window.location.href));</script>
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## Hardware and control
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- RX: XIAO ESP32-S3/WIO SX1262, COM31, MAC 28:84:85:b4:09:80. Normal gain
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register 0x94, unchanged-modulation cache enabled, buffered 8 MHz SPI.
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- TX: newly connected Heltec V4, COM7, MAC 44:1b:f6:6a:e8:44. Hardware probe
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found ESP32-S3, 2 MB embedded PSRAM and 16 MB flash. HIL detected KCT8103L
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FEM and reported the amplified TX path; chip RX gain 0x96.
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- User explicitly authorized erasing the V4 without backup. Its full flash
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was erased and a verified HIL upload completed. XIAO's previous HIL image
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was replaced with a verified same-image A/B-capable build. No private
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backup contents were read; RAK and other boards were not touched.
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- SF10/125 kHz, CR4/5, four centers 909.500/909.750/910.000/910.250 MHz,
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5.1-symbol visits (41,780 us), 32-symbol TX preamble, zero added settling,
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synthetic 16-byte packets, -9 dBm **chip request**. No extra IRQ polling.
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The V4 FEM uses the repository's production detection and TX/RX control.
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HIL restores RX after success or error on each direct transmit path. The
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GC1109 branch (not detected here) uses bypass according to
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[GC1109 table 4](https://resource.heltec.cn/download/WiFi_LoRa_32_V4/datasheet/GC1109_EN_V0.9.2.pdf).
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The detected KCT8103L uses its amplified path; antenna-port TX power was not
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measured. This is not a power-matched Indicator/V4 comparison.
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## Exact experiment
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`scanfreqrepeat 1` makes the HIL `ExperimentalSX1262` repeat the same
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SetRfFrequency (0x86) immediately after the first successful frequency call,
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before modulation, packet parameters and RX restart. The second call skips
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the image-calibration check, but keeps normal BUSY/status handling. Only an
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identified RX-to-RX hop may repeat; ordinary setup/TX does not. Either write's
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failure propagates through the existing failed profile-apply path. The toggle
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defaults off at reboot and cannot change during an active scan.
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Both modes use the same XIAO binary. Actual SPI command counts, not only
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software policy labels, are checked against one or two 0x86 writes per hop.
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The modulation cache remains on in both modes.
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## RX-only timing
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Six-second windows in single/double/double/single order, with reboot/clean
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setup between windows. No reference packets transmitted during this phase.
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| Frequency writes | Hops | Mean switch | Actual 0x86 | Actual 0x8B |
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| --- | ---: | ---: | ---: | ---: |
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| Single, first | 142 | 451.965 us | 142 | 0 |
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| Double, first | 141 | 538.213 us | 282 | 0 |
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| Double, second | 141 | 538.170 us | 282 | 0 |
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| Single, second | 142 | 451.930 us | 142 | 0 |
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Weighted means: **451.948 us single, 538.192 us double**: +86.244 us / +19.1%.
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All 566 hops had zero retune, RX-mode and cache errors. Maximum observed
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switch costs were 594 us single and 674 us double; these are samples, not
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hard latency guarantees. Unheld full-cycle means were about 168.942 ms versus
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169.285 ms.
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## Packet checks
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Single first, then double, each up to 100 packets/channel and stopping on its
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first miss; a 400/400 result would have stopped all RF testing. Neither passed.
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| Frequency writes | Valid before first miss | Failed packet | RF-run mean switch | Hops / 0x86 writes |
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| --- | ---: | ---: | ---: | ---: |
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| Single | 1 | 2, channel 2 | 452.719 us | 235 / 235 |
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| Double | 4 | 5, channel 2 | 542.063 us | 255 / 510 |
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Both failed packets were receiver timeouts, with TX success acknowledged,
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zero device-error flags and RX mode still active. Both settings reported zero
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retune, RX-mode, cache and RX errors. Ordinary processing after received
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packets caused one/four modulation rewrites respectively; pure RX-only timing
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above is the cleaner comparison of the duplicate cost.
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All five good V4 packets reported **-19 dBm RSSI**. SNR was +9.0 dB in the
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single-write sample and +8.2..+9.2 dB (mean +8.675 dB) for four double-write
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samples. The previous Indicator run had 547 good packets at average -40.547
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dBm RSSI, +8.311 dB SNR. Thus this V4 setup was about 21.5 dB stronger as seen
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by the receiver. Hardware/antenna/placement/power differences remain
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confounded; neither the Indicator nor close-range effects are proven causes.
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One versus four successes before a miss is too small and stop-conditioned to
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establish a reliability improvement or packet-error rate. Repeating center
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frequency did not remove the observed failure at this setting. No results for
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lower SFs or added settling delays are claimed for the V4. A weaker received
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signal is needed before treating a transmitter swap as a clean comparison.
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## Artifacts and checks
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Base checkout `0e5955f889788a4317863e731b38ffe09e3d5441`, branch
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`keymindCascade`, plus local uncommitted changes. RadioLib 7.7.1 pinned at
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`187ef24791c3d844939b2be13a68bd890bd04e4c`, Espressif32 6.11.0 / Arduino
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ESP32 2.0.17. Both builds/uploads succeeded and uploader verified written
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data. The 59 selected host/native tests passed (39 collectors, ten profile,
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four SX1262, five radio and one receive-mode), including FEM restore on error
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and frequency-repeat scope/error propagation. Temporary build overlay removed.
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Actually loaded firmware SHA-256:
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- XIAO: `9f82d86ea78cfa6bc03fef4925f10c918c8b9fc7a96a7d2b565a04bd2f281288`
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- V4: `2ea2ce37d9d66fb4f8ec9cf3cedfbe7d4eb6d08bfe9abe6c817e5afb04885636`
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Raw evidence and byte-preserving SHA-256:
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- [RX-only ABBA](../tools/hil/profile_switch_frequency_sf10_rx_only_results.json):
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`38ded968a60ff19f45618ec35d75ce46354d81f163879185e9d6ff0e68da3ae0`
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- [Single-write packets](../tools/hil/profile_switch_frequency_v4_sf10_off_results.json):
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`4cadeba0d22b3ec6158ff295f1becfb57fde7ef8bf7fabbdbc6295f274619557`
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- [Double-write packets](../tools/hil/profile_switch_frequency_v4_sf10_on_results.json):
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`46bea8d9c095847ef8ccf4a4ed51ab5404eb5bb87d9cf62b832c3298159d1525`
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This document is now in [Test Results](test-results/double_frequency_v4_validation.md).
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