N6ACH Antenna Analysis

This JavaScript program evaluates the performance of an antenna system, computing the consequences of SWR and feedline loss.

original program concept done in CPM basic by KC6A and N6NB

forward power from transmitter in watts	-1VSWR @ transmitter
feed line loss in db( must be in line with other values)	Enter 2.2 for dipoles; add 2.2 for antennas rated in dBd
Enter operating frequency in mHz 1.8mHz to 2450mHz

reverse power at transmitter	-1VSWR @ antenna
forward power in watts at antenna	reflected power in watts from the antenna
true power in watts into antenna	power in watts lost in feed line
db line loss including EIRP in watts	power in watts off the antenna

Coax Cable Signal Loss (Attenuation) in dB per 100ft aprox

Loss

RG-174

RG-8

RG-8X

RG-213

RG-6

RG-11

RF-9914

RF-9913

LMR-1200

LMR-900

LMR-600

1/2” Superflex

1MHz

1.9dB

0.5dB

0.2dB

0.3dB

0.2dB,

10MHz

3.3dB

1.0db

0.6db

0.4db

0.5db

0.4db

30MHz

0.2db

0.28db

0.42db

0.56db

50MHz

6.6db

1.2db

2.5db

1.6db

1.4db

1.0db

1.1db

0.9db

0.27db

0.37db

0.55db

0.73db

100MHz

8.9db

1.5db

3.6db

2.2db

2.0db

1.6db

1.5db

1.4db

0.4db

0.6db

0.92db

1.1db

200MHz

11.9db

1.8db

5.4db

3.3db

2.8db

2.3db

2.0db

1.8db

0.58db

0.78db

1.1db

1.5db

400MHz

17.3db

2.5db

7.9db

4.8db

4.3db

3.5db

2.9db

2.6db

0.80db

1.1db

1.45db

2.3db

700MHz

26.0db

3.25db

11.0db

6.6db

5.6db

4.7db

3.8db

3.6db

900MHz

27.9db

3.9db

12.6db

7.7db

6.0db

5.4db

4.9db

4.2db

1.27db

1.7db

2.5db

3.41db

1GHz

32.0db

4.4db

13.5db

8.3db

6.1db

5.6db

5.3db

4.5db

1.40db

2.0db

3.0db

4.4db

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