Thank you, I've saved that, Hugh.
On 03/11/2015 20:08, John Rabson wrote:
I haven’t looked at this sort of configuration recently, but it is worth
perhaps consulting the doctoral thesis of David Gibson, which you can find at
http://etheses.whiterose.ac.uk/4169/1/uk_bl_ethos_270894.pdf
Chapter 4 contains discussion of antennas, both in air-cored and ferrite-based.
Although it principally deals with subterranean situations you may find it
useful.
John F5VLF G3PAI
On 03 Nov 2015, at 20:43, LineOne <[email protected]> wrote:
Amongst some ferrite rods, I have 3 identical, all with LW & MW windings. I
could remove the windings and make a fat bundle of the 3 then wind another coil for
an LF preamplifier to improve on my existing one. Inductors are better not to be
long and thin I know but what about the magnetic cores such as ferrite?
This makes some sense, but I would rather join the rods in line, retaining a
litz wire LW winding which will tune with about 470pF, ending up with an 18mm
PVC tube of about 600mm and a small ABS box in the centre so the whole looks
like a VHF dipole.
Has anyone done this?
Yesterday we were enveloped in a very wet, dripping fog and it seemed to
attenuate my few LF transmissions as nobody received them. UHF TV disappeared
later in the evening too.
The antenna is surrounded by about 100 trees which probably doesn't help.
GW4NOS was on, in S. Wales I think they had a nice, sunny day and G3XIZ also.
Hugh, M0DSZ
[email protected]
Researching history of RABSON, BLACKSHAW, GAUNTLETT, VERLANDER and ROBSONNE
|
