Telewave, Inc.
Model 44A/AP
Page 19
7.04
Figure 7-3 shows a chart for a jumper cable to be used inline with
the Model 44A/AP Wattmeter to minimize potential measurement
errors in systems with high VSWR. The chart shows lengths for
a 50-ohm, RG-213 jumper cable, including N connectors, using a
velocity factor of 0.66 for the cable and connectors. The jumper
cable and wattmeter together should equal as close to 1/2 wave-
length equivalent as possible, at the test frequency.
Figure 7-3: RG-213 Jumper Cable with N-Male Connectors
MHZ INCHES
25 = 153.23
30 = 127.25
35 = 108.69
40 = 94.78
45 = 83.95
50 = 75.29
55 = 68.21
60 = 62.30
65 = 57.31
70 = 53.03
75 = 49.32
80 = 46.07
85 = 43.20
90 = 40.66
95 = 38.38
100 = 36.33
105 = 34.47
110 = 32.78
115 = 31.24
120 = 29.83
125 = 28.53
130 = 27.33
135 = 26.22
140 = 25.19
145 = 24.23
150 = 23.34
155 = 22.50
160 = 21.71
165 = 20.98
170 = 20.28
175 = 19.63
180 = 19.01
MHZ INCHES
185 = 18.42
190 = 17.87
195 = 17.34
200 = 16.84
205 = 16.37
210 = 15.92
215 = 15.48
220 = 15.07
225 = 14.68
230 = 14.30
235 = 13.94
240 = 13.60
245 = 13.26
250 = 12.95
255 = 12.64
260 = 12.35
265 = 12.06
270 = 11.79
275 = 11.53
280 = 11.28
285 = 11.03
290 = 10.80
295 = 10.57
300 = 10.35
305 = 10.14
310 = 9.93
315 = 9.73
320 = 9.54
325 = 9.35
330 = 9.17
335 = 8.99
340 = 8.82
MHZ INCHES
345 = 8.65
350 = 8.49
355 = 8.34
360 = 8.18
365 = 8.04
370 = 7.89
375 = 7.75
380 = 7.61
385 = 7.48
390 = 7.35
395 = 7.22
400 = 7.10
405 = 6.98
410 = 6.86
415 = 6.75
420 = 6.64
425 = 6.53
430 = 6.42
435 = 6.32
440 = 6.22
445 = 6.12
450 = 6.02
455 = 5.92
460 = 5.83
465 = 5.74
470 = 5.65
475 = 5.56
480 = 5.48
485 = 5.39
490 = 5.31
495 = 5.23
500 = 5.15
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