Thank you Gus! Mike KK5SC
Sent from my T-Mobile 5G Device Get Outlook for Android<https://aka.ms/AAb9ysg> ________________________________ From: BVARC <bvarc-boun...@bvarc.org> on behalf of Gus Bernard via BVARC <bvarc@bvarc.org> Sent: Tuesday, August 15, 2023 5:30:44 PM To: BRAZOS VALLEY AMATEUR RADIO CLUB <bvarc@bvarc.org> Cc: Gus Bernard <gneln...@gmail.com> Subject: Re: [BVARC] High power EFHW Antenna/ MFJ-1982HP 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<http://shopjubilee.com> via BVARC <bvarc@bvarc.org<mailto: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 * 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 ________________________________________________ Brazos Valley Amateur Radio Club BVARC mailing list BVARC@bvarc.org<mailto: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/
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