[Boatanchors] Good (And Bad) Lengths For End-Fed And Dipole Antennas

Tue Nov 24 07:48:20 EST 2020

The DJ0IP website (www.dj0ip.de) has lots of good info on
wire antennas and lots of other worthwhile stuff!  It will keep
you occupied for MANY hours (days?).

73 - Mac, K2GKK/5
Since 30 Nov 1953
Oklahoma City, OK
USAF (Retired) 61-81
FAA (Retired) 94-10

________________________________
From: Mark K3MSB <mark.k3msb at gmail.com>
Sent: Tuesday, November 24, 2020 06:28
To: D C _Mac_ Macdonald <k2gkk at hotmail.com>
Cc: Rob Atkinson <ranchorobbo at gmail.com>; boatanchors at mailman.qth.net <boatanchors at mailman.qth.net>
Subject: Re: [Boatanchors] Good (And Bad) Lengths For End-Fed And Dipole Antennas

I think the confusing part was  " "random-wire" end-fed antennas ";   what was meant is random length end-fed (or center fed) antennas.

Don, thanks for posting those links.    The one I've used is http://ocarc.us/docs/antennas/MultibandCenterfedZepp.pdf<https://nam11.safelinks.protection.outlook.com/?url=http%3A%2F%2Focarc.us%2Fdocs%2Fantennas%2FMultibandCenterfedZepp.pdf&data=04%7C01%7C%7C7ededa1e2d42410dedab08d890746c5d%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637418176985678850%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=mszW%2FFN62QxP5M5hjsYW6b4ZyGX2aLmfBxW%2B%2FSuceto%3D&reserved=0>.

73 Mark K3MSB

On Tue, Nov 24, 2020 at 7:18 AM D C _Mac_ Macdonald <k2gkk at hotmail.com<mailto:k2gkk at hotmail.com>> wrote:
NO problem if you are talking about a single band 1/2 wave dipole.

This all about building an ALL-BAND antenna, either end-fed or fed
at center with parallel line (ladder/window/open wire).

Sorry if that was not obvious.

An E.F. Johnson matchbox may very well match just about any load,
regardless of impedance and wild reactance.

73 - Mac, K2GKK/5
Since 30 Nov 1953
Oklahoma City, OK
USAF (Retired) 61-81
FAA (Retired) 94-10

________________________________
From: Rob Atkinson <ranchorobbo at gmail.com<mailto:ranchorobbo at gmail.com>>
Sent: Tuesday, November 24, 2020 05:15
To: D C _Mac_ Macdonald <k2gkk at hotmail.com<mailto:k2gkk at hotmail.com>>
Cc: boatanchors at mailman.qth.net<mailto:boatanchors at mailman.qth.net> <boatanchors at mailman.qth.net<mailto:boatanchors at mailman.qth.net>>
Subject: Re: [Boatanchors] Good (And Bad) Lengths For End-Fed And Dipole Antennas

Thanks for taking the time to post this data.

>BAD:  16  19  22  26  32  33  38  44  46  48  52  64  65 66  76  78
>80  88  92  95  96  99  104  110  112  114  123  128  130 132
>133  138  144  152  154  156  160  165  171  176  182  184

I guess I don't understand what this means.  If I am correct it tells
me that a 80 m. half wave dipole fed in the center with each side 65
feet long is "bad."   That's a 1/2 wave dipole 130 feet long which
according to the ancient formula is cut for 3600 kc.   That's exactly
what I have, fed with ladder line and a KW Matchbox and it works FB.
 The numbers list says 130, 128 and 132 feet are bad.  Does this mean
131 feet is okay?  That seems ridiculous.  So I must not understand
this.

73

Rob
K5UJ
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