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Update gemini.md for GemX #438

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Nov 8, 2024
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Update gemini.md for GemX #438

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Update gemini.md for GemX
ot0tot Nov 4, 2024
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ot0tot Nov 4, 2024
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1 change: 1 addition & 0 deletions .wordlist.txt
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Expand Up @@ -492,3 +492,4 @@ DAC
Bidirectionality
VTXes
OpenVTX
Xrossband
4 changes: 2 additions & 2 deletions docs/software/gemini.md
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---
template: main.html
description: ExpressLRS Gemini is a Dual Channel 2.4GHz or 900MHz System. Gemini is not Dual Band.
description: ExpressLRS Gemini is a Dual Channel 2.4GHz and/or 900MHz System.
---

![Software Banner](https://raw.githubusercontent.com/ExpressLRS/ExpressLRS-Hardware/master/img/software.png)

## What is Gemini?

Gemini is a dual channel 2.4GHz OR 900MHz system. However, it is currently NOT Dual Band e.g. 2.4GHz and 900MHz simultaneous transmissions.
Gemini is a dual channel 2.4GHz and/or 900MHz (and potentially other low-band frequencies) transmission mode that leverages true diversity hardware to maximize LQ. This page covers single-band Gemini mode, which uses diversity hardware to transmit in multiple channels within the same band (e.g. 2.4GHz or 900MHz). There is also a dual-band mode, Gemini Xrossband or GemX, which is capable of transmitting on both 2.4GHz and 900MHz bands simultaneously. Please see the [PR here](https://github.com/ExpressLRS/ExpressLRS/pull/2540) for more info while the documentation is updated.

In Gemini Mode, a TX module simultaneously transmits a packet in two frequencies 40MHz apart for 2.4GHz and ~10MHz apart for 900MHz users. The packet separation used is half of the frequency domain selected and will vary a little. A true diversity Receiver is used to receive both packets simultaneously. Transmitting on 2 separate frequencies provides better interference avoidance and/or mitigation, in a similar way DVDA does by sending repeat packets sequentially on different frequencies. This means, the Receiver has an increased chance of receiving the packet. This results in a much higher and stable LQ.

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