| Hi
I am doing a bit of Marie Kondo in my shack and am wondering if ok to list an item here?
Trying to “bring joy” to my space and possibly another ham. 😊
Thanks
Rick KE5DI
Sent from my iPhone On Aug 17, 2023, at 11:49, Rick Hiller via BVARC <bvarc@bvarc.org> wrote:
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
Thanks Rick!
Mike KK5SC
-------- Original message --------
Date: 8/16/23 12:09 AM (GMT-06:00)
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
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
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
- 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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________________________________________________
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
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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