[TowerTalk] re:204BA Dimensions

[George Cutsogeorge]

Several people responded to my request for info on up to date dimensions
for the 204BA.  My instruction book dates to 1965.  A couple of people said
"leave it alone", but the definitive answer came from Roger Cox of Telex. 
Roger provided a set of dimensions for stacking at 50 and 100 feet.  He
also provided two tables which show the performance of the original
dimensions and the modified for stacking dimensions at different stacking
distances.

As it happens, the original dimensions appear to be good for the stacking
separation which I have chosen.  (Based on multiple runs of YT.)

Rogers info is reproduced below.

George
w2vjn@rosenet.net

............................................................................
................................................

George,

Here is the YO file data for dimensions of 204BA's stacked at 100' and 50'
on the CW setting.  This gives better F/B in a stacked configuration.

Hy-Gain 204BA (CW) stacked
14.000 14.100 14.200 MHz
4 elements, inches
           4.0000    1.2500    1.1250    0.8750    0.6250    0.4375
  0.000    3.6250   41.8750   46.0000   50.5000   24.0000   53.0000
122.875    3.6250   32.3750   46.0000   50.5000   24.0000   54.6250
211.625    3.6250   18.3750   46.0000   50.5000   24.0000   60.7500
307.250    3.6250   14.1250   46.0000   50.5000   24.0000   53.0000

73 Roger WB0DGF
Telex Communications, Inc.


George,

The 204STK dimensions were specifically for 100'/50'.  The regular CW
dimensions (HG204BA1) look like they work just as well for a 105'/70'
stack.  Here's how the two models perform:

HG204BA1 (CW-14.1):
Distance     Gain(dBd)     F/B(dB)
0                    6.15                25.4
30'                 8.41                23.8
35'                 8.76                23.4
40'                 9.07                20.3
45'                 9.28                17.9
50'                 9.36                17.3
55'                 9.37                18.7

HG204STK (CW-14.1):
Distance     Gain(dBd)     F/B(dB)
0                    6.26                23.6
30'                 8.46                22.5
35'                 8.82                22.0
40'                 9.15                20.8
45'                 9.38                20.4
50'                 9.49                22.5
55'                 9.51                22.1

73 Roger WB0DGF
Telex Communications, Inc.











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