For the 32 footer deployed linearly....A quick EZNEC model shows 2 minor, but usable, 3K SWR dips at 20 and 10....nothing in between though. I suggest using the 63:1 turns ratio XFMR....(I think it is 63) instead of the 47:1. 63:1 Gets you a closer to 50 ohm starting point at the xcvr/ATU end. You are definitely going to have to fiddle with length to get the freqs that you want to be at the low SWR point.
GL..Rick W5RH On Fri, Sep 6, 2024 at 3:18 PM Suggs, Marvin (KTRK-TV) via BVARC < [email protected]> wrote: > > Sent from my iPhone > > On Aug 24, 2024, at 6:31 PM, Marvin Suggs via BVARC <[email protected]> > 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 <[email protected]> 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 < > [email protected]> 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 <[email protected]> > 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 < > [email protected]> 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) < > [email protected]> wrote: > > Thanks everybody! > Sent from my iPhone > > On Aug 21, 2024, at 8:09 AM, Rick Hiller via BVARC <[email protected]> > 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 <[email protected]> > 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$> > > On Wednesday, August 21, 2024 at 07:23:20 AM CDT, David Holden via BVARC < > [email protected]> wrote: > > > If you are trying to build an end feed half wave (EFHW) antenna, the > length is in the name. A half wave at 40m is ~66 feet. Start with 67 feet > and fold back the end until you get a good SWR. You need a 49:1 > transformer on one end to get the impedance down to 50 ohm and to connect > your coax. Mine is resonant at 10 through 40m. > > David WJ9O > > > > On Aug 20, 2024, at 11:54 PM, Suggs, Marvin (KTRK-TV) via BVARC < > [email protected]> wrote: > > > > Hey everybody > > I’m looking for a diagram and dimensions for a 40 meter end fed sloper > antenna. Not having much luck on YouTube. > > Thanks > > Marvin > > N5RKW > > Sent from my iPhone > > ________________________________________________ > > Brazos Valley Amateur Radio Club > > > > BVARC mailing list > > [email protected] > > http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org > <https://urldefense.com/v3/__http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org__;!!Om87Lau1Cg!JOo4jHKjK_nhbWHbko8FrVQgqkPbyM0AEXmaweHArpZB_p9zQ2rHzipvBio1CUly8V_uIXbJMu2y3Q$> > > Publicly available archives are available here: > https://www.mail-archive.com/[email protected]/ > <https://urldefense.com/v3/__https://www.mail-archive.com/[email protected]/__;!!Om87Lau1Cg!JOo4jHKjK_nhbWHbko8FrVQgqkPbyM0AEXmaweHArpZB_p9zQ2rHzipvBio1CUly8V_uIXa8aDw4QQ$> > > > > ________________________________________________ > Brazos Valley Amateur Radio Club > > BVARC mailing list > [email protected] > http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org > 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________________________________________________ > Brazos Valley Amateur Radio Club > > BVARC mailing list > [email protected] > http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org > <https://urldefense.com/v3/__http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org__;!!Om87Lau1Cg!OcLcX3P548bKQBNGDTlbogdmIy-9xSlyYmh2oIZOftXeUtEoH2LpagAzKQVLV2C55IUnd4KAbRFMPw$> > Publicly available archives are available here: > https://www.mail-archive.com/[email protected]/ > <https://urldefense.com/v3/__https://www.mail-archive.com/[email protected]/__;!!Om87Lau1Cg!OcLcX3P548bKQBNGDTlbogdmIy-9xSlyYmh2oIZOftXeUtEoH2LpagAzKQVLV2C55IUnd4Lcoez_2g$> > > > ________________________________________________ > Brazos Valley Amateur Radio Club > > BVARC mailing list > [email protected] > > https://urldefense.com/v3/__http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org__;!!Om87Lau1Cg!OcLcX3P548bKQBNGDTlbogdmIy-9xSlyYmh2oIZOftXeUtEoH2LpagAzKQVLV2C55IUnd4KAbRFMPw$ > Publicly available archives are available 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