Bird 4431 "Thruline"
| Type: | Directional wattmeter |
| Frequency range: | 0.45-2700 MHz depending on coupler ("plug") |
| Power handling: | 100 mW-10 KW (depending on coupler ("plug") |
| Dimensions (W*H*D): | ? mm |
| Weight: | ? Kg |
| Manufactured: | USA, 197x-xxxx |
| Other: | Built-in variable RF signal sampler New price 1979 in the US: $??.?? |
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