Today i make some test with different antenna length.
- without any antenna wire i have about 2m range
- with 17cm antenna straight - aprox. 4m
- with dipol how suggest @jremington i don't see any relevant improvement
- with 34cm antenna - aprox. 8m
- with 51cm - no improvement
Again i use am remote like i say in first post, not pair transmitter-receiver
So i think that this type of receiver It is not good enough. I honestly do not understand how I can get some users distances of tens of meters.
Still not have any suggestion about receivers that I mentioned in first post.
@srnet
I see many wireless transmitters but big question is: my actual remote will work with this receiver? I see that support OOK modulation mode. I'm not expert but i think that all these remotes like mine support ASK modulation.
Receivers that i mentioned in first post support ASK modulation so most probably will work with my remote.
Superheterodyne receiver have better range that super regenerative?
Thank you all for answers!