Tnx fer the correction, Gus…..weakening eye site I’m sure.  Hi
RH

Sent from my i-Thingamajig

On Aug 17, 2023, at 9:35 AM, Gus Bernard via BVARC <bvarc@bvarc.org> wrote:


Rick meant March 2020.  😉
Gus


On Wed, Aug 16, 2023 at 12:17 AM mike.williams shopjubilee.com via BVARC <bvarc@bvarc.org> wrote:
Thanks Rick!

Mike KK5SC 



Sent from my Galaxy



-------- Original message --------
From: Rick Hiller via BVARC <bvarc@bvarc.org>
Date: 8/16/23 12:09 AM (GMT-06:00)
To: BRAZOS VALLEY AMATEUR RADIO CLUB <bvarc@bvarc.org>
Cc: Rick Hiller <rickhille...@gmail.com>
Subject: Re: [BVARC] High power EFHW Antenna/ MFJ-1982HP

Mike,

The Radio Hotel  Nov 2016  and May 2020 are about wire for antenna use.  References are given for more indepth studies, etc. 


GL and 73...Rick  W5RH -- The Radio Hotel

On Tue, Aug 15, 2023 at 5:42 PM Gus Bernard via BVARC <bvarc@bvarc.org> wrote:
BTW, for antenna wire, see articles by our own Rick Hiller in the technical section at www.bvarc.org . I think he's addressed this subject.  I like #14 or #12 insulated.  Solid or stranded choice depends on your strength and flexibility requirements. Thicker wire gives a slightly better bandwidth at the cost of weight.

Gus

On Tue, Aug 15, 2023, 5:30 PM Gus Bernard <gneln...@gmail.com> wrote:
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@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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--
Rick Hiller  
Cell:        832-474-3713
Physical: 9031 Troulon Drive
               Houston, TX 77036
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