My name is Marco and I'm Italian, I apologize for my bad English,
I thank you for accepting me in the forum,
I am part of an RC tank modeling association on a 1: 6 scale "mezzi Grandi"
  I have 2 RC tanks in 1: 6 scale,
  1 PZIII Armortek and a Stuart M5A1 of the twenty centuri toys,
  2 armored cars "lancia lince astura" and "SPA AB41" in WIP self-built in steel
 1 volkswagen beetle

  I use Spektrum radio I have a DX8 dsmx,
  I read the wiky in which it is written that there are only 2 compatible receivers 1 the orange 615x, and the other Lemon Rx DSMX Compatible PPM 8-Channel

looking at the spektrum site I found the AR7700 Serial Receiver with PPM/SRXL/Remote Receiver Output (SPMAR7700)
https://www.horizonhobby.com/product/storefronts/aircraft-receivers/switch-to-spektrum-receiver-sale/ar7700-serial-receiver-with-ppm-srxl-remote-receiver-spmar7700

I saw two other receivers SPM4648 and SP4949T, but I did not understand if they are true receivers or just satellites

Can it be compatible with the TCB board?

I now use a 3-position switch for the headlights and the notek
 best regards
 Marco