Cockpit SX Tutorials: Antenna Fixings
This page shows the optional swivel joint (# 75129) and stub antenna (# 75126) for the Cockpit SX.
Swivel joint (# 7 5129)
The swivel joint allows the standard antenna to be tilted to any angle.
How it works
The assembly screws into the Tx in place of the regular antenna. Two set screws are used to set the and tilt angles (Allen keys are provided). The antenna then screws into the assembly.
Once it's all assembled, only the antenna itself needs to be removed between sessions - the swivel joint remains attached to the Tx.
Components of swivel joint
Allen keys to lock pan and tilt angles
Ready to go
In Use
I have to say I'm not totally convinced by the swivel joint. The knuckle tends to slip and the whole assembly has a tendency to unscrew itself. This is hardly surprising considering the amount of torque being applied at the base of the antenna.
Stub antenna (# 7 5126)
In contrast, flying with the stub aerial is a delight. It makes a good alternative to the standard antenna (a) if the Tx must be handheld and (b) if some reduction in range can be tolerated. I've used it for DLG and slope soaring, with no problems. The only slight niggle is that the neckstrap adjustment point is optimised for the long aerial.
Multiplex provide only very rough guidelines about usable range. If range is a concern, then I'd suggest using a receiver with a glitch counter like the Schulze 5.35 and 8.35, or some of the MPX IPD receivers as this may provide some indication of incipient range issues. (Thinks... a real time field strength monitor mounted on the model with an RF downlink would be perfect!)
Stub antenna