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Ryan Malloy 579bad9921 Expand docs with full Winegard hardware reference 
Add Carryout and Trav'ler Pro to firmware variant table, SK-1000
physical specs, error messages, calibration procedures, emergency
stow notes, motor behavior details, and Gpredict setup config.
Note leap-frog bug is also present in Pro repo.
2026-02-11 06:18:48 -07:00

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Known Bugs in Original Code

Leap-Frog Elevation Bug

Location: Trav-ler-Rotor-For-HAL-2.05/travler_rotor.py lines 98-105

Issue: The elevation delta section of the leap-frog algorithm modifies target_az instead of target_el. This is a copy-paste error from the azimuth section above it.

Original code (lines 90-105):

# Azimuth compensation (correct)
if target_az - current_az > 2:
    target_az+=1
elif target_az - current_az < -2:
    target_az-=1
elif target_az - current_az > 1:
    target_az+=0.5
elif target_az - current_az < -1:
    target_az-=0.5

# Elevation compensation (BUG: modifies target_az instead of target_el)
if target_el - current_el > 2:
    target_az+=1              # <-- should be target_el
elif target_el - current_el < -2:
    target_az-=1              # <-- should be target_el
elif target_el - current_el > 1:
    target_az+=0.5            # <-- should be target_el
elif target_el - current_el < -1:
    target_az-=0.5            # <-- should be target_el

Impact:

  • Elevation leap-frog compensation was never applied, so the dish would lag behind in elevation during fast satellite passes
  • Azimuth received double compensation (its own delta + the elevation delta), causing over-correction on the azimuth axis

Affected repos:

  • saveitforparts/Trav-ler-Rotor-For-HAL-2.05 — travler_rotor.py lines 98-105
  • saveitforparts/Travler-Pro-Rotor — same bug copy-pasted into travler_pro_rotor.py

Fix: In travler_rotor.leapfrog.apply_leapfrog(), the elevation compensation correctly modifies target_el.