Sent from my iPhone On Aug 24, 2024, at 6:31 PM, Marvin Suggs via BVARC <bvarc@bvarc.org> wrote:
This Message is From an External Sender Caution: Do not click links or open attachments unless you recognize the sender and know the content is safe. Thanks Everyone. I'm not going to have room the 66' EFHW so would a 32' for working 10 and 20 meters work? Thanks Marvin N5RKW On Aug 24, 2024 4:51 PM, Chris Medlin via BVARC <bvarc@bvarc.org> wrote: If youre going to use the coax feedline as your counterpoise, you will need a choke inline between your 49:1 transformer and the radio. I hear the magic distance from the 49:1 to place your choke should be about 47 feet. Personally, I dont use a choke. I just use a countrrpoise wire that runs perpendicular to my antenna roughly 10-12 ft long maybe its a little longer. YMMV on that. Chris/AC5CM Typos brought to you by iPhone On Aug 22, 2024, at 20:43, Suggs, Marvin (KTRK-TV) via BVARC <bvarc@bvarc.org> wrote: So the counterpoise is the feed line? Thank you Sent from my iPhone On Aug 22, 2024, at 7:55 PM, Michael Shanks via BVARC <bvarc@bvarc.org> wrote: This Message is From an External Sender Caution: Do not click links or open attachments unless you recognize the sender and know the content is safe. From what I’ve been told you need about 50 foot of coax would be a good counterpoise for an fed. That’s what I use. It worked well. Sent from my iPhone On Aug 22, 2024, at 3:36 AM, Suggs, Marvin (KTRK-TV) via BVARC <bvarc@bvarc.org> wrote: What is a counterpoise? And is it required for an end fed sloper antenna? Thanks Marvin N5RKW Sent from my iPhone On Aug 21, 2024, at 10:35 AM, Suggs, Marvin (KTRK-TV) <marvin.su...@abc.com> wrote: Thanks everybody! Sent from my iPhone On Aug 21, 2024, at 8:09 AM, Rick Hiller via BVARC <bvarc@bvarc.org> wrote: This Message is From an External Sender Caution: Do not click links or open attachments unless you recognize the sender and know the content is safe. Marvin, "End Fed" pretty much locks you into the EFHW arena. Halfwave wire oriented at about 45 degrees with the feed point at the ground. Easily made (ARRL kit for 40) and deployed. In the traditional sense, a "half sloper" was typically a 1/4 wl wire fed against a 1/4 wl tower, with variations of that being quite prevalent, with varying results ranging from great to not worth a s%&*.....but most being quite finicky to get working properly, with minimal advantages attained. . Those designs, with comments as just stated, can be found in the ARRL Antenna Handbook, going back to last century or check out ON4UN's "Low Band DX'ing" comments re: half slopers and sloping dipoles. Within the last 10 years the low cost, easy up, multi-band EFHW popularity has taken hold and can be deployed as whatever you wish it to be....horizontal, L, vertical, sloper, zig-zag, etc. GL and 73...W5RH On Wed, Aug 21, 2024 at 7:41 AM mark janzer via BVARC <bvarc@bvarc.org<mailto:bvarc@bvarc.org>> wrote: Also, check out: https://www.earchi.org/92011endfedfiles/Endfed6_40.pdf<https://urldefense.com/v3/__https://www.earchi.org/92011endfedfiles/Endfed6_40.pdf__;!!Om87Lau1Cg!JOo4jHKjK_nhbWHbko8FrVQgqkPbyM0AEXmaweHArpZB_p9zQ2rHzipvBio1CUly8V_uIXaPqS_kdQ$> On Wednesday, August 21, 2024 at 07:23:20 AM CDT, David Holden via BVARC <bvarc@bvarc.org<mailto:bvarc@bvarc.org>> wrote: If you are trying to build an end feed half wave (EFHW) antenna, the length is in the name. A half wave at 40m is ~66 feet. Start with 67 feet and fold back the end until you get a good SWR. You need a 49:1 transformer on one end to get the impedance down to 50 ohm and to connect your coax. Mine is resonant at 10 through 40m. David WJ9O > On Aug 20, 2024, at 11:54 PM, Suggs, Marvin (KTRK-TV) via BVARC > <bvarc@bvarc.org<mailto:bvarc@bvarc.org>> wrote: > > Hey everybody > I’m looking for a diagram and dimensions for a 40 meter end fed sloper > antenna. 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