Ok Alan, ..laws
That's easy , just claim there linked to dark
matter , then anything go's : )
A ground mounted ui-pole , is it really just
a short thin loop ? , if the ATU
earth is bonded to the ground point ? ,
IF..the current at the earth and
at the feed point are equal and
opposite , then nothing will happen , or
have I missed something ? or is there
a diminishing distribution , but over a short
loop , what go's out , must come back to
the tuner ? what's radiating or is it
establishing a near field by cancelation ,
ala counter-would ? .. Its something that could be
erected in the uk 20x40 back plot..
This talks of top loading and 'ground
reference system ' what ever that is , no
info , unless its a tuned counterpoise ....
something I had not though of , tuner in the
earth line to match to the ground z on
477 .... what happens at commercial mw
sites , marine wise the hull is earth ?
appears to have a cage of wires
to increase the tower diameter , the tower
is actually broken up with insulators , once again
, may be the effort should be in establishing
a top loaded vertical cage / top ,loading
and not a multi wire top ?
bbc mw tx side
nav text mf Ae
Ranges on the radiation plot look
familiar 250/300 K first skip ?
Sent: Friday, May 08, 2015 5:28 PM
Subject: LF: Re: UNIPOLE V INV-L ?
Well the Laws of Physics dont change however much
one might wish it :-))
The unipole will be approx -3dB ERP on the inv
Effective height of unipole approx half physical
Effective height of inv L same height with 1.5*h
top is approx 0.9* physical height
inv L disadvantage.....requires another support and
inv L advantage ........over poor ground with the
same feed-point grounding the inL will have lower ground loss and higher
capacity. Over good ground or sea-water this advantage may disappear, but losses
will be low anyway.
I think this folded monopole is covered in Rik's
tutorial, the extra wires are just "matching" they dont increase the radiation
resistance. Commercial stations like grounded aerials for lightning
----- Original Message -----
Sent: Friday, May 08, 2015 4:54 PM
Subject: LF: UNIPOLE V INV-L ?
UNI-POLE V INV-L ?
Assuming a robust ATU and earth
What would be the advantage / disadvantage
of say a 40 foot uni-pole
, to a conventional 40 x
60 ft inv L at MF ?
tower and side wire or RG8U /
copper pipe construction ? ......... -3 dB of a
similar size loop ?