Picture this, if you will: A 40 meter 1/4 wave vertical mounted on a 10 foot wood mast with 4 radials, also 10 ft up. Would you: Run a wire from the connection between the radials and the coax shield
Don, K4BEV; A ground connection down the wood support to a ground rod with 33' radials will provide an excellent ground screen for the 10' high 40 meter vertical. If you are serious about performance
<in re holding down radials> I found a local wholesale beauty supply place that sells boxes of 500 bobby pins cheap. I had it hidden among my antenna supplies until my daughter found it. Now she has
--part1_93.194027cf.29b8c83c_boundary Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit With all due respect to those who have suggested you create a ground screen in addit
This is a multi-part message in MIME format. --=_NextPart_000_0002_01C1C5B0.3FC14030 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit I respectfully disagree. The ground s
This is a multi-part message in MIME format. --Boundary_(ID_UEhCjPvkYqDnPn+0dOjHwQ) Content-type: text/plain; charset=US-ASCII Content-transfer-encoding: 7BIT Remember that the two most common "verti
--==_11992153==_.ALT Content-Type: text/plain; charset="us-ascii"; format=flowed I own one, chimney mounted. It is not an antenna. It is a less than effective dummy load performing equally poorly on
This is a multi-part message in MIME format. --Boundary_(ID_6xihU+ukB1n9TXXHpc2+/A) Content-type: text/plain; charset=US-ASCII Content-transfer-encoding: 7BIT Sorry yours doesn't work so well, Stu. U
This is a multi-part message in MIME format. --Boundary_(ID_x+sse0XrzxeFO7WHVz7Vhw) Content-type: text/plain; charset=US-ASCII Content-transfer-encoding: 7BIT One correction, I meant to write that th
This is a multi-part message in MIME format. --=_NextPart_000_01F4_01C1C605.583E5260 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MessageI have an R7 whi
Seems to be a lot of people wading in with absolute authority on what is an "it depends" topic. What it depends upon is ground conductivity, for the most part. There was significant quantitative work
More like 80% efficiency (1 dB loss) Not according to professional field strength measurements. The key here is the existence of the original radials. They make a major difference in ground conducti
Actually there was no quantitative work done at all, other than models. The only data from measurements used standard FCC slope-of-ground-conductivity measurements, and they can easily be all over t
According to the field strength graph in N6PL's vertical antenna book, 15 1/4 wave radials under a 1/4 wave radiator would yield an efficiency ~70% of that which would be acheived using 113 radials (
....and 120 radials are totally useless, unless the radials are about 1/2 wl long. Efficiency effectively stops increasing at about 50 radials when the radials are 1/4 wl long, and efficiency is ver
This is a multi-part message in MIME format. --=_NextPart_000_00DA_01C1C8F2.A888E830 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable As far as nobody really
--part1_32.237a2562.29bdfb43_boundary Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit I just don't understand how a ground screen, unconnected to the antenna does anythin
under does Ground screen prevents RF from penetrating and "reflecting" from poor ground, it shields it from the RF generated by the radiator and elevated radial(s) = better efficiency. This is analo
THREE sources of loss in a vertical system. 1) loss in the current sink, solved with elevated radials or a dense radial system. 2) E-plane penetration of the ground and resultant lossy current immedi