[BVARC] High power EFHW Antenna/ MFJ-1982HP

Sean - N5LNK sean.n5lnk at gmail.com
Tue Aug 15 12:07:37 CDT 2023


I have the MP version and love it. I made many DX contacts with it. I have had it in a couple different configurations. When I was able to string it out straight I had no problems with it getting out on 10-80m running 100w on my FT991a. The squirrels recently sent it to the ground for me so I am now looking into another location to put it back on the air as my main antenna. 

73 de
Sean - N5LNK

> On Aug 15, 2023, at 10:40 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 –
> 
> 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?
> 
> 
> 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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