RA87 cooling stack
This custom 3d printed bracket assembly holds a pair of RA87 radios and provides cooling for the TX radio. The assembly comes mostly assembled, simply attach the side brackets to your RX radio with the OEM mounting screws, place the cooling stack above the RX radio, and mount the TX radio in the bracket above the cooling stack with the OEM screws.
Fully assembled, everything is sturdy with the side brackets having mounting holes on the bottom to screw down the whole assembly if desired. Printed with 3mm thick walls in PET-G HF with a glass transition temp of 66C or 150F.
Comes with a Noctua NF-P14 4-pin 12v cooling fan that operates at 2.4w while moving around 78CFM and making only 26dB of noise. The fan can be replaced with another square 140x140x25 mm fan if needed but the efficient Noctua is a great choice for solar/battery deployments with limited energy budget. The included fan has a 4-pin connector capable of reporting RPM to, and receiving speed control PWM signals from, a fan speed controller.
How it works
The 140mm fan pushes air upwards within the cooling stack pulling in cool air from the front of the assembly just above the RX radio. Air is pushed up against and along the bottom heatsink of the TX radio and exhausted out the back of the assembly just below the TX radio.
What you get
- The partially assembled cooling stack, consisting of a 140x140x25 mm Noctua fan and 3d printed upper and lower stack sections
- Two side brackets for holding the RX radio, cooling stack, and TX radio together (use the OEM RA87 mounting screws)
- A bare lead (red/black) to 4 pin cable. When not using a fan speed controller, this cable will allow the fan to run at full speed off of a 12v source without having to dismantle the fan wiring connector