[TowerTalk] [Bulk] Cutting a FT-240 type 33...in half

[Jim Brown]

On Tue,2/10/2015 12:14 PM, john at kk9a.com wrote:
> 3KW average power on 28Mhz and below. The PEP/CW rating is higher do to
> less heating. This is well above the rating for RG-213 that I use for my
> antenna lead.

There is dissipation in a ferrite core choke in the resistance coupled 
from the ferrite core. It is the coax shield that gets hot, not the 
ferrite (although the heat in the coax may be transferred to the ferrite 
material). This is in addition to the usual dissipation inside the coax 
associated with the differential transmitter power. The coax must be 
rated to handle both.

I've never used any of those special high temperature, small diameter 
coaxes, so I can't add anything more than that. :)

73, Jim K9YC