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 >> >> ________________________________________________ >> Brazos Valley Amateur Radio Club >> >> BVARC mailing list >> BVARC@bvarc.org >> http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org >> Publicly available archives are available here: >> https://www.mail-archive.com/bvarc@bvarc.org/ >> >
________________________________________________ Brazos Valley Amateur Radio Club BVARC mailing list BVARC@bvarc.org http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org Publicly available archives are available here: https://www.mail-archive.com/bvarc@bvarc.org/
