I have a HOA gate entrance that uses a Linear ACT-34B (318 MHz) remote and two Liftmaster 8550W garage doors (315 MHz). Is there a clone or learning remote that would consolidate these into one remote?
Likely there is not a learning remote for this, since they are different frequencies and protocols.
There are a couple of options, though:
Add a "Security+ 2.0" compatible receiver to the gate
Depending on the actual gate used, if you can wire in a universal receiver, then you can link the Liftmaster remote with it. Would need details on the gate control hardware to help with that (probably best to ask a separate question).
Of course, if "HOA" == "Home owner association" == you can't modify the gate, then this may not be an option. Maybe you could get the HOA to wire this in, as likely other residents would benefit because Liftmaster is a pretty popular brand (also sold as Chamberlain and many Sears brands, and probably others).
Custom-build a remote
Looks like the Linear remote is already a "keychain" remote. From there, get a normal Liftmaster visor remote, and try to fit the contents of the linear into it, or potentially get a Liftmaster keychain remote (smaller) and fit both of them into a visor-style clip.