View Single Post
  #165   Report Post  
Old April 4th 08, 04:22 PM posted to rec.radio.amateur.antenna
Art Unwin Art Unwin is offline
external usenet poster
 
First recorded activity by RadioBanter: Mar 2008
Posts: 1,339
Default Antenna physical size

On Apr 4, 8:08 am, wrote:
On Apr 4, 7:02 pm, "Dave" wrote:
You are thinking wrong.


you might as well plonk him, he is either a persistent troll or totally
convinced that only he has the proper view of the world. in either case you
are fighting a losing battle.


Two perfect examples of a closed mind, but not to worry
enlightenment will be along shortly.

Derek


I thought I would share with you my readings on the 160 M band
They are in order as follows Freq, resistance, reactance swr

1.8 105 0 2.1
1.81 105 0 2.0
1.82 105 0 2.0
1.83 105 0 2.0
1.84 102 0 2.0
1.85 98 0 1.9
1.86 92 0 1.8
1.87 88 6 1.7
1.88 83 7 1.7
1.89 84 8 1.7
1.9 81 12 1.6
1.91 78 13 1.6
1.92 75 12 1.5
1.93 72 13 1.5
1.94 68 11 1.4
1.95 67 10 1.4
1.96 66 10 1.3
1.97 64 9 1.3
1.98 62 9 1.3
1.99 62 9 1.3
2.0 62 7 1.2
The above figures are obtained by ensuring no external inductance and
capacitances
were introduced to the intrinsic radiation circuit during assembly.
As one would expect, the above figures would represent the features
through out the frequency range
Impedance values mainly resistance will change according to the point
of jumper connection of wire supplied.
This allows for lossless matching to the drive circuit regardles of
its impedance value.
Those you are familiar with antennas will see that the above figures
in no way
represent those of a dummy load
'The above figures show an excellent match to 75 ohm cable. Thge
figures were taken with a
mfj 259b which is designed for 50 ohm cables.
TGIF
Art Unwin