[BVARC] High power EFHW Antenna/ MFJ-1982HP
Gus Bernard
gnelnard at gmail.com
Tue Aug 15 17:30:44 CDT 2023
See product design specs, as well as articles, at Balun Designs.Com. use
the core mix type for the bands you'll operate on. For high power,
double-up on size 240 cores. Youtube "TRX Bench" channel has a great
4-part video series on building baluns.
My experience tells me that if I want a long lasting, reliable balun (good
quality components and workmanship that withstand the elements), it's more
cost effective to buy off the shelf from Balun Designs or equivalent. (The
amount I saved wasn't worth the trouble.) Of course, making my own is fun
and educational; but I now buy my baluns from Bob.
Gus K5GMB
On Tue, Aug 15, 2023, 10:39 AM mike.williams shopjubilee.com via BVARC <
bvarc at bvarc.org> wrote:
> 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
> 1. Core type and number of cores
> - type 53 has a higher curie temp as opposed to type 43....
> 2. Wire AWG?
> 3. I see a number of YouTube videos recommending 56:1 as 49:1
> - Comments?
>
>
>
> 1. What is your recommended wire for the radiation element?
> 1. 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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