Updates

content/drone-stuff/_index.md

@@ -10,6 +10,7 @@ Click on a link in the list below to go to that page:
 
 1. [A simple guide to PID control](../../drone-stuff/a-simple-guide-to-pid-control)
 1. [Ardupilot setup checklist](../../drone-stuff/ardupilot-setup-checklist)
+1. [FPV frequency chart](../../drone-stuff/fpv-frequency-chart)
 1. [General RC tips](../../drone-stuff/general-rc-tips)
 1. [Getting uninverted SBUS on a no-name FrSky-compatible receiver](../../drone-stuff/getting-uninverted-sbus-on-a-no-name-frsky-compatible-receiver)
 1. [Getting uninverted SBUS/SmartPort on the FrSky XSR receiver](../../drone-stuff/getting-uninverted-sbus-smartport-on-the-frsky-xsr-receiver)

content/drone-stuff/ardupilot-setup-checklist.md

@@ -91,24 +91,11 @@ The values in this section are specific to the Omnibus F4, but the settings aren
 
 ## Tuning the TECS
 
-To [tune the TECS](https://ardupilot.org/plane/docs/tecs-total-energy-control-system-for-speed-height-tuning-guide.html), follow this procedure:
+To tune the TECS, read the [TECS tuning guide]](https://ardupilot.org/plane/docs/tecs-total-energy-control-system-for-speed-height-tuning-guide.html). It's very well-written and comprehensible. Note the maximum pitch up/down you want your plane to fly at (depending on the max vertical speed you want), and tune based on that.
-
-- [ ] Set `THR_MAX` to the max throttle you want the system to use in altitude controlled modes.
-- [ ] Set `TRIM_ARSPD_CM` to the desired cruise air speed.
-- [ ] Set `TRIM_THROTTLE` to fly at `TRIM_ARSPD_CM` while level.
-- [ ] Set `TECS_PITCH_MAX` to the maximum angle that can achieve `TRIM_ARSPD_CM` at `THR_MAX`, and set `TECS_CLMB_MAX` to the maximum climb rate.
-- [ ] Set `TECS_PITCH_MIN` and `TECS_SINK_MAX`.
-
 
 ## In the field
 
 - [ ] Run an autotune.
-- [ ] Note a comfortable airspeed so you can tune `TRIM_ARSPD_CM` later.
-- [ ] Note your stall airspeed  so you can set `ARSPD_FBW_MIN` later.
-- [ ] Note your maximum airspeed at `THR_MAX` so you can set `ARSPD_FBW_MAX` later.
-- [ ] Fly and check at what max pitch angle up you can achieve `TRIM_ARSPD_CM` with throttle at `THR_MAX`.
-- [ ] Fly and check at what max pitch angle down you can achieve `TRIM_ARSPD_CM` with throttle at 0, so you can set `TECS_PITCH_MIN`.
-- [ ] Note the throttle percentage that will fly at `TRIM_ARSPD_CM` while level (so you can tune `TRIM_THROTTLE` later).
 - [ ] Fly in FBWA and see if you're gaining/losing altitude. Pitch up/down to fly level, check the pitch on the OSD, and use the formula `old_value+pitch*π/180` to get the new value (in radians).
 
 
@@ -117,6 +104,6 @@ _(Many thanks to Michel Pastor for his help with everything in this note.)_
 * * *
 
 <p style="font-size:80%; font-style: italic">
-Last updated on January 08, 2021.  For any questions/feedback,
+Last updated on January 09, 2021.  For any questions/feedback,
 email me at <a href="mailto:hi@stavros.io">hi@stavros.io</a>.
 </p>

content/drone-stuff/fpv-frequency-chart.md

@@ -0,0 +1,33 @@
++++
+title = "FPV frequency chart"
+weight = 3
+sort_by = "weight"
+insert_anchor_links = "right"
++++
+If you're curious about which frequencies to use for video when there are multiple people flying FPV, as well as which bands are used by various manufacturers, here's a handy chart:
+
+[![FPV frequency chart](../../resources/48cfa1097ca847c5a9ff8229005e7f50.png)](../../resources/48cfa1097ca847c5a9ff8229005e7f50.png)
+
+It was made by [5zero7 RC](https://youtu.be/wScS5XloviM) with information from [a Propwashed article](https://www.propwashed.com/video-frequency-management/).
+
+
+## Best channel groups
+
+Here are the best channel groups for each number of pilots, from the chart:
+
+- 2 pilots - E2 (5685), E6 (5905)
+- 3 pilots - E2 (5685), F4 (5800), E6(5905)
+- 4 pilots - E2 (5685), F2 (5760), F7 (5860) E6 (5905)
+- 5 pilots - E2 (5685), F2 (5760), F4 (5800), F7 (5860), E6 (5905)
+- IMD6C - R1 (5658), R2 (5695), F2 (5760), F4 (5800), E5 (5885)
+- 6 pilots - E2 (5685), F1 (5740), F3 (5780), F5 (5820), F7 (5860), E6 (5905)
+- IMD6C - R1 (5658), R2 (5695), F2 (5760), F4 (5800), F8 (5880), R8 (5917)
+
+
+
+* * *
+
+<p style="font-size:80%; font-style: italic">
+Last updated on January 09, 2021.  For any questions/feedback,
+email me at <a href="mailto:hi@stavros.io">hi@stavros.io</a>.
+</p>

content/drone-stuff/general-rc-tips.md

@@ -1,6 +1,6 @@
 +++
 title = "General RC tips"
-weight = 3
+weight = 4
 sort_by = "weight"
 insert_anchor_links = "right"
 +++

content/drone-stuff/getting-uninverted-sbus-on-a-no-name-frsky-compatible-receiver.md

@@ -1,6 +1,6 @@
 +++
 title = "Getting uninverted SBUS on a no-name FrSky-compatible receiver"
-weight = 4
+weight = 5
 sort_by = "weight"
 insert_anchor_links = "right"
 +++

content/drone-stuff/getting-uninverted-sbus-smartport-on-the-frsky-xsr-receiver.md

@@ -1,6 +1,6 @@
 +++
 title = "Getting uninverted SBUS/SmartPort on the FrSky XSR receiver"
-weight = 5
+weight = 6
 sort_by = "weight"
 insert_anchor_links = "right"
 +++

content/drone-stuff/inav-tuning-tips.md

@@ -1,6 +1,6 @@
 +++
 title = "INAV tuning tips"
-weight = 6
+weight = 7
 sort_by = "weight"
 insert_anchor_links = "right"
 +++

content/drone-stuff/omnibus-f4-pro-servo-diode.md

@@ -1,6 +1,6 @@
 +++
 title = "Omnibus F4 pro servo diode"
-weight = 8
+weight = 9
 sort_by = "weight"
 insert_anchor_links = "right"
 +++

content/drone-stuff/omnibus-f4-v3-pinout.md

@@ -1,6 +1,6 @@
 +++
 title = "Omnibus F4 V3 pinout"
-weight = 7
+weight = 8
 sort_by = "weight"
 insert_anchor_links = "right"
 +++

content/drone-stuff/transmitter-external-module-pinout.md

@@ -1,6 +1,6 @@
 +++
 title = "Transmitter external module pinout"
-weight = 9
+weight = 10
 sort_by = "weight"
 insert_anchor_links = "right"
 +++