ETS-Lindgren 3121D Dipole - Manual (Page 22)

22 | Mounting Instructions
To use these adapters to mount the Model 3121D to a 4-TR tripod:
3121D DB-1
3121D DB-2,
3121D DB-3,
3121 DB-4
1. Assemble the clamp block, support base, and support rod, and attach
the support base to the 4-TR tripod.
2. Unscrew the clamp block latch and open the top.
3. Insert the balun into the clamp block and close the top over the balun.
4. Move the latch to the closed position and tighten so the balun is held
securely.
5. Attach the cable to the output connector on the antenna.