Build from the base upward: The CHA 34HD REDUCER KIT is the missing mechanical interface between the narrower CFM-34HD base and the 3-inch CHA PORTA-MOUNT family. It keeps the mast centered and supported instead of letting a high-leverage field system ride loosely in an oversized mount.
Deployment sequence
- Seat the lower support sleeve fully with the protective cap at the mast base.
- Align the two upper halves and tighten the supplied hardware only until snug.
- Insert the assembly into the 3-inch mount with the upper flange flush to the mount.
- Verify that the mast cannot rock or pull sideways before raising it.
Before raising the antenna
- The current kit uses an upper two-piece sleeve, a lower stabilizer, stainless hardware, and the mast protective/bottom cap identified in the mast guide.
- Choose the PORTA-MOUNT separately for the actual vehicle or structure.
- The reducer does not increase the mast load, height, or wind rating.
Before transmitting
- Confirm every mast section, clamp, mount, adapter, guy line, antenna attachment, coax route, and RF-return conductor.
- Begin RF checks at low power after the final geometry is stable.
- Record the exact configuration so a successful setup can be reproduced.
- Do not raise a mast if either sleeve is missing, loose, cracked, or not fully seated.
- Do not overtighten and deform the mast.
Use the current CHA 34HD REDUCER KIT instructions.
Open CFM34HD_3_Inch_Reducer_Sleeve_Quick_Start_260716.pdf · Open the product page
