The difference between the BX and HBX and the HDBX is what size the base is. The BX will go to 64 ft, HBX 56 ft and the HDBX 48 ft. Now the bottom section of the HDBX is IIRC approx 27 across (leg to leg) on section 8. This tower is a good tower and will handle a tri band yagi plus some other smaller (6, 2 mtr) above it . What you don't want to do is put a ten foot mast on top and put the yagi at the top the mast. You need to leave it approx 2 ft above the top plate and you will be fine. I have one in my back yard with an A4S w/ 40 mtr add on for the last 8 yrs and it has survived 60 mph wind winds during the monsoon season. Don't discount his tower, it it a good tower. According to Mnf specs it does require a good size base. Do you have the Mnf specs?
Any way good luck w/ it, and you know if $$ is no object, you could go get a tower w/ a hazer system.
73 de wn2c Rick
Now that puts another spin on it....I want to do it safely....If I need another tower than so be it....but if I can make it work (safely) with what I have than that would save quite a few bucks..
What I know for sure is that this is a 48' BX tower consisting of Sections 1, 2, 3, 4, 5, 6 as listed in the BX brochure.
- My Ham IV rotator does not fit in the top section..
- If it were to fit......this tower with the rotator mounted in the top section.....probably will support the antenna but not the torsional forces...
If I use only sections 3 ,4, 5, 6, I essentially have a 32' HDBX-32 with an 18Sq/ft area.
Since the rotator does not fit in the top section, I need to move it. What if I move it and mount it in section 3?
- Place a thrust bearing in section 2 (middle of)
- Place a thrust bearing on the top of section 1.
- Mast would be 25ft long, 7 feet of it above the top section.
- Antenna mounted 1.5ft above the top section, rest of the mast is for support ropes to the 40M kit.
- The rotator would sit approximately 18ft below the top plate of section 1.
- At roughly 25ft there will be a bracket to the house.
With this, only section 3 would see the torsional (twisting) load directly while sections 1 and 2 would not. (sections 1 and 2 would see a "bending" load or side load).
Or am I all wet with this train of thought...