It's a non issue with 10 kw pep out, (1kv peak) even 20 kw pep out..(1414 V peak)
I am not questioning the efficacy of the antenna, just the application of the math. Your math above still needs some editing if you are concerned about the maximum vpeak voltage on the antenna.
- Glenn W9IQ
At the 50 ohm feedpoint, with a 1:1 swr, nope. At the tips of the DE, assume it's gonna be sky high.
Math is nice - but the math on wire size and dissipation are not gonna be at all nice - @ 50 MHz Cu wire has a resistance of about 0.9 Ohms/foot or about 100 Watts/foot. This is going to give problems. Feeding this with exactly what transmission line type? LDF 7-50 or perhaps something even stouter? RG-393 is beyond spec at 54 MHz and 10 kW... and that is NOT out in the environment....
Plus, just because it sort of highlights the issue: why would anyone want a dipole on 54 MHz? 1 kW into a 6 element Yagi-Uda will give you an effective main lobe power of 9 dBd in free space and 13-15 dBd over a decent ground. In real terms that is a lot better deal than a dipole at 10 kW as you can reduce environmental noise due to directionality....
That is reality. What you are describing is just ego.
Grover
Grover, do you think we are all as stupid as a brick ?? The basic formulae is just for average current..... and RMS / peak Voltage into a 50 ohm matched load.
It's then up to the END USER to use APPRPORIATE rated connectors, main coax, flexible coax for rotor loops, line sections, mode, duty cycle, CM chokes, relays, and everything / anything else used downstream, including ants, corona balls, tubing material suitable for the current / voltage...on 6M.
LDF 5-50 rated for 10.91 kw CCS @ 50 mhz.
LDF 6-50 rated for 17.42 kw CCS @ 50 mhz.
LDF 7-50 rated for 23.63 kw CCS @ 50 mhz.
So no, heliax bigger than LDF 7-50 is NOT required. Try learning how to read a spec.
SFT-600 teflon, flexible coax (teflon version of LMR-600UF) is rated for 13.1 kw CCS @ 50 mhz.
This is what is typ used for rotor loops. SFT-600 is also used for shorted 1/4 wave stubs. A shorted 1/4 wave stub will be installed inside the RF deck, across the vac load cap, to supplement the even order harmonic suppression. That's on top of the existing C-L-C-L-C (L-PI) output network. It will also be used to DC ground all the tank components, instead of the typ safety choke used across a load cap.
IF 2 x yagi's used, the feedline to each yagi only has to handle 1/2 of the applied power. If 4 x yagi's used, like 4 x 11 ele long boom yagi's on a H frame, each feedline to each yagi only has to handle 1/4 of applied power.
Ditto with 3 x yagis...each handles 1/3 of applied power.
For driving 2-3-4 yagi's in phase, various methods of splitting can be employed. For HF, monoband arrays, simple LC networks are used... shunt C and series L. 50 ohms in..and 25/16.66 / 12.5 ohms output..... that then feeds 2/3/4 output connectors. Then equal lengths of coax to each yagi's feedpoint.
What I have just described here IS the reality. Everything has to be carefully designed, sized, constructed and configured for this application / configuration. We don't just... 'guess' or use ..'trial + error' methods.
