Thanks to both responses..

the reason I am enquiring about this is because I have a spektrum 3500 micro receiver, which is not compatible with the spektrum HRS unit... So my question remains..

Will this spektrum system: SPM1014 fit in both the:

1. 3VC Super HR

And

2. 3VC Super PCM

What Makes the Futaba 3VCS either HRS or PCM. Is it the module and receiver or is it something more 'internal'?

That being said, If I Purchase a 3VCS HRS could I use the non HRS spektrum system on it??