title_body: multi-protocol transmitters -- difference between stm32 4-in-1 and stm32 c2500 only ? [tx16s Vs. tx12] Searching on the radio controllers radiomaster TX16s and TX12,
  
  I found that video https://www.youtube.com/watch?v=ekrG5meNZOU%3F&amp;t=5m47s
  that warns me that Tx16s has an internal stm32 4-in-1 protocols chip, whereas Tx12 has an stm32 c2500 &quot;only&quot;, according to this opensource project website : https://downloads.multi-module.org/
  
  What are the cons with the c2500 chip ? Does it handle less protocols ? Does it provide less power to the 2.4GHz antenna and thus reduces the range for sending commands?
  What is spectrum protocol ? A brand of drones ? I often hear about these recceivers for not being compatible with universal radio transmitters
upvoted_answer: 1&gt; The &quot;4 in 1 chip&quot; does handle more protocols than the CC2500. It has the CC2500, nRF24L01, A7105 and CYR all integrated in one package and allows you to bind with and use Flysky, Spektrum, HUBSAN, DSM2, DEVO, J6PRO, ESKY, HISKY, KN, V2X2 and ASSAN receivers which you won't be able to do with just the CC2500.
  2&gt; Spektrum is basically a brand of high end radios. (At least they are high end for me)