You can't discharge the batteries in lots of different Transmitters with your cycler, but you most certainly can discharge them very easily.

Pull out the antenna and turn on the TX. Now go about your latest building project. Watch the meter on the TX and turn the sucker off when it shows the battery is discharged. It takes awhile, and isn't high tech. But it certainly discharges the sucker. And that's the first step in cycling.

How low a reading do you look for? Whatever voltage your cycler says it's going to take it's discharge to.

You won't get a readout on the capacity dumped on that discharge. But what actually matters is the info you get from your charger when you recharge that battery.

You know, just because some things are not possible with our high tech stuff, doesn't mean they're no longer possible.