I knew it wouldn't be long.
The (NS) stands for new system, works with RC4 decoder.
MRT Transponder, PTX-20 (NS) On this new version, the LED flashes twice when it's powered up to show it's the NS version and works with the new mylaps RC4 decoder, old MRT transponder comes on with no flash.
These transponders from MRT are lightweight and small in size. This makes them easy to fit into the smallest, tightest areas. The transponder in the main picture above has had it's mounting flanges trimmed off. Some drivers want them on there, some don't. Ours have the tabs so you can leave them or trim them (see photo below).
The PTX ID number of each transponder can be changed by use of a 'setup' button (20 alternative ID numbers are available). Each individually numbered transponder has its 'custom' ID number written on the supplied instruction sheet with the 20 alternative numbers also listed as two sets of 10 ID's.
PTX transponders are supplied with 20 stored ID numbers and come factory set on the custom ID. By pressing the setup button it is possible to switch from the custom number to the other numbers if required. To use the PTX it should be connected to a power socket on a receiver or to a battery pack. The LED will light up to show the transponder is operating. When setting the number (or checking the number that is set) the LED will flash to show the number selected, or the number that has been set.
Weight: with the long power lead and mounting tabs as shown below is 5 grams.
Compatibility: AMBrc2, AMBrc3 and RC4 systems.