expressslrs on other bands

[Alex Fraser]

I snatched this from AI (Gemini).

Q: Can you put expresslrs on the 1.2 gig ham band?
No, you cannot put ExpressLRS on the 1.2 GHz (23cm) amateur radio band.
While the 1.2 GHz / 1.3 GHz spectrum is highly valued by HAM radio 
operators for long-range analog and digital FPV video transmitters, the 
ExpressLRS firmware cannot be ported or built to operate on this 
frequency.[1, 2]
The limitations preventing an ELRS link on 1.2 GHz stem from hardware 
constraints rather than software blockages:


    1. Complete Absence of 1.2 GHz LoRa Microchips

ExpressLRS relies fundamentally on Semtech LoRa hardware transceivers to 
achieve its extreme long range and high packet sensitivity.[3]

  *


  * Semtech only manufactures these chips for specific global ISM bands:
    the SX1280 series handles 2.4 GHz, the SX1276/1262 series handles
    868/915 MHz, and the older SX1278 chips or newer LR1121
    architectures handle Sub-GHz frequencies like 433 MHz.[4, 5, 6]
  * Semtech does not make a LoRa chip that natively covers or tunes to
    the 1200 MHz–1300 MHz spectrum. Because ELRS code is entirely
    hardwired to leverage the inner logic of Semtech's LoRa modems, you
    cannot run ELRS on non-LoRa RF hardware.
  *


    2. Fatal Interference with GPS (The Harmonic Issue)

Even if custom RF mixing or up-converting hardware was engineered to 
push an ELRS signal into the 1.2 GHz band, it would be highly 
impractical for RC flight. The 1.2 GHz Ham band sits directly adjacent 
to the GPS L1 frequency (1575.42 MHz) and overlaps the GPS L2 frequency 
(1227.60 MHz).

  * 1.2 GHz video transmitters are notorious for immediately blinding or
    wiping out GPS locks on drones unless heavily filtered and
    physically separated from the GPS puck.[7]
  * Because an ExpressLRS transmitter on a drone (the receiver) sends
    heavy telemetry bursts back to your handset, a 1.2 GHz ELRS
    transmitter on board would permanently blast out your drone's GPS
    module, stripping your aircraft of crucial navigation and rescue
    features.[3]

------------------------------------------ Me, not 
AI------------------------------------
There are plans and kits.


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