COAX LENGTH TO WATTAGE LOST CHART FOR 2M & 70CM
Created by KC9CUK
| COAX RG‐8X |
WATTS IN |
2M 146mhz |
WATTS OUT |
WATTS LOST |
DB LOSS |
| 25 FEET |
50 |
2M 146mhz |
39.42 |
10.58 |
1.021 |
| 50 FEET |
50 |
2M 146mhz |
31.237 |
18.76 |
2.043 |
| 100 FEET |
50 |
2M 146mhz |
19.515 |
30.485 |
4.086 |
| 150 FEET |
50 |
2M 146mhz |
12.192 |
37.8 |
6.129 |
| 200 FEET |
50 |
2M 146mhz |
7.617 |
42.38 |
8.172 |
| COAX LMR‐400 |
WATTS IN |
2M 146mhz |
WATTS OUT |
WATTS LOST |
DB LOSS |
| 25 FEET |
50 |
2M 146mhz |
45.827 |
4.175 |
0.374 |
| 50 FEET |
50 |
2M 146mhz |
42.085 |
7.915 |
0.748 |
| 100 FEET |
50 |
2M 146mhz |
35.423 |
14.577 |
1.497 |
| 150 FEET |
50 |
2M 146mhz |
29.816 |
20.184 |
2.245 |
| 200 FEET |
50 |
2M 146mhz |
25.096 |
24.904 |
2.994 |
| COAX RG‐8X |
WATTS IN |
70cm 435mhz |
WATTS OUT |
WATTS LOST |
DB LOSS |
| 25 FEET |
30 |
70cm 435mhz |
18.821 |
11.179 |
2.025 |
| 50 FEET |
30 |
70cm 435mhz |
11.807 |
18.193 |
4.05 |
| 100 FEET |
30 |
70cm 435mhz |
4.647 |
25.353 |
8.099 |
| 150 FEET |
30 |
70cm 435mhz |
1.829 |
28.171 |
12.149 |
| 200 FEET |
30 |
70cm 435mhz |
0.72 |
29.28 |
16.199 |
| COAX LMR‐400 |
WATTS IN |
70cm 435mhz |
WATTS OUT |
WATTS LOST |
DB LOSS |
| 25 FEET |
30 |
70cm 435mhz |
25.77 |
4.23 |
0.66 |
| 50 FEET |
30 |
70cm 435mhz |
22.136 |
7.864 |
1.32 |
| 100 FEET |
30 |
70cm 435mhz |
16.334 |
13.666 |
2.64 |
| 150 FEET |
30 |
70cm 435mhz |
12.052 |
17.948 |
3.961 |
| 200 FEET |
30 |
70cm 435mhz |
8.893 |
21.107 |
5.281 |
LOSS CALCULATIONS BASED ON A 1:1 SWR I.E A PERFECT MATCH BETWEEN THE RADIO AND ANTENNA
REMEMBER THIS LOSS AFFECTS TRANSMIT AND RECEIVE A 3DB GAIN OR LOSS IS A SUBSTANTIAL DIFFERENCE |
