Time to pick your brains…
I am interested in EFHW antennas for primary use on 20/40/80m – but want to be
able to run my Worthmore 600w amplifier.
I found a MFJ model - MFJ-1982HP is rated for 800pep
https://mfjenterprises.com/products/mfj-1982hp
This antenna is available in three power ratings:
MFJ-1982LP – 30w
MFJ-1982MP – 300w
MFJ-1982HP – 800w
Anyone have experience with this antenna?
A couple of questions –
1. If you have experience with high power (>= 600w) transformers for EFHW
antennas, what design did you use
* Core type and number of cores
* type 53 has a higher curie temp as opposed to type 43....
* Wire AWG?
* I see a number of YouTube videos recommending 56:1 as 49:1
* Comments?
1. What is your recommended wire for the radiation element?
* Material –
i. Copper over steel?
ii. Hard-drawn copper?
iii. Other
b.AWG?
i. Number of Strands &
strand count?
c. Jacket material
d. Other?
Your guidance is appreciated!
’73,
Mike KK5SC
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