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The RadioPopper JrX kit is a radio transmitter and receiver kit for Canon that allows manual power level adjustment and triggering with compatible Speedlites and studio strobes. It offers a range of up to 1700ft (various conditions will lessen this) without line-of-sight restrictions. It has 16 user-selectable channels to enable interference-free shooting.
The transmitter’s compact size allows for an unobtrusive setup. The three control dials offer the ability to adjust three separate groups of lights. When used with the AlienBees B800 strobes, you’ll have full power adjustment control thanks to the receiver’s RJ-11 data control port. If using a TTL-compatible Canon Speedlite, the included RPCube allows the JrX triggers to control power adjustments manually using the same control dials on the transmitter.
The JrX transmitter and receiver use dip-switches to make channel selections, as well as a couple tweaks to controls. The maximum flash sync possible with the JrX system is 1/250 second. It does not offer HSS, so it doesn’t sync any higher in any mode. Both the transmitter and receiver are powered by a CR123 battery. We send a battery in each unit, but if you plan on shooting for an extended period of time, you may want to have a backup battery for each.
Studio Strobe Users
While the JrX can trigger any studio strobe with a 1/8" sync port, you will only have the JrX power adjustment option with AlienBee, White Lightning, and Zeus units. The only strobe units we rent that allows JrX power adjustment are the AlienBees B800 and AlienBees ABR800 Ringflash.
After each power adjustment made, you must hit the test/power button to dump excess power to ensure the light updates. On AlienBee strobes, you’ll want to use the included 1/8" dummy plug to deactivate the optical slave. Otherwise, you may have misfires if other flash sources are near.
Canon Speedlite Users
All of the Canon Speedlites we rent are compatible with the JrX’s power adjustment feature. According to the manufacturer’s website, “you can control the power output remotely on most TTL-capable Canon flashes”. Since we can’t test the JrX with older Canon Speedlites that we don’t carry, we can only guarantee compatibility with the versions we carry. Your older Canon flash may work, but we haven’t tried it. In other words, use at your own risk.
While the Canon Speedlite used must be TTL-compatible to allow power adjustments, the JrX does not transmit the TTL information. The RPCube simply overrides the TTL mode with the light level you dial in on the transmitter. With that said, you must have the flash set to TTL mode to adjust power levels.
- JrX Transmitter
- JrX Receiver
- RPCube for Canon
- 1/8" to 1/8" Sync cord
- 1/8" dummy plug
- RJ-11 “telephone” cord
- Dip-Switch Guide
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