TopBand: Rohn 25

[Joe Subich, W8IK]

At 03:37 PM 8/20/97 EDT, you wrote:

>===================
>No one has come up with any info on exact lengths of such top sections
>yet, so I'll continue to model Rohn 25 with regular 10' (9' 8-1/2")
>sections (using 10.783" OD "wires" if the same ratio applies for a 12.5"
>face).
>===================

Earl, 

I finally went to the bookshelf and picked up the Rohn commercial catalog. 
There are SIX different Rohn 45 top sections.  Each of the sections is 
based on five (5) zig-zag bays of 15 3/4" each plus 5" stubs at the 
bottom.  The differences are as follows: 


                   25AG      25AG1     25AG2      25AG3      25AG4      25AG5

Overall Length:    9' 0"   9' 3.25"    9' 9"     9' 3.5"   8' 0.162"   8' 3.5"

Top pipe OD:        2.0"      1.55"     2.25"      2.25"      n/a        2.75"

Top Pipe length:   8.25"      12"        18"         12"      n/a        0.0

Taper Length:        16"      15"        15"      16.75"     12.25"     17.15"


Note: the 25AG4 is the "flat plate" top section  and does not taper. 

      "taper length" is the distance between the top of the five zig-zag bays 
      and the "tube" or top plate. 

Let me know if you need any further information. 



73, 

  ... Joe Subich, W8IK  ex-AD8I
       <w8ik@ibm.net>


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