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. > > Go to https://bvarc.org/home/tech-downloads/ > > 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 >>>> >>>> ________________________________________________ >>>> 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/ >> > > > -- > Rick Hiller > *e-mail: rickhille...@gmail.com <rickhille...@gmail.com>* > *Cell: 832-474-3713* > *Physical: 9031 Troulon Drive* > * Houston, TX 77036* > ________________________________________________ > 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/ >
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