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The Drake MN-75 manages rf radiation in the areas of impedance match to the antenna, rf power measurement, VSWR measurement, reduction of harmonic radiation, and antenna selection. |
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B-1000 Balun Model 1510 |
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 | Frequency Coverage: |
1.8-30.0 MHz Range switch selects one of the following frequency ranges:
1.8-3.0 MHz, 3.0-5.0 MHz, 5.0-7.0 MHz, 7.0-10.0 MHz, 10.0-14.0 MHz, 14.0-18.0 MHz, X0-23.0 MHz, 23.0-26.0 MHz and 26.0-30.0 MHz.
| Input Impedance: 50 ohms (resistive). | ||||||||||||||||||||
| Load Impedance:
50 ohms coaxial at any phase angle with a VSWR range as described
in char-t following.
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| Balanced Feedlines: with the Drake B-1000 accessory balun, tunes impedances as described in following chart. |
FREQUENCY |
VSWR |
| 1.8-3 MHz | 40-1000 Ohms (5:1 VSWR Referenced to 200 Ohms) |
| 3-5 MHz | 40-1000 Ohms |
| 5-7 MHz | 40-1000 Ohms |
| 7-10 MHz | 40-1000 Ohms |
| 10-14 MHz | 40-1000 Ohms |
| 14-18 MHz | 40-1000 Ohms |
| 18-23 MHz | 40-1000 Ohms |
| 23-26 MHz | 50-800 Ohms (4:1 VSWR Referenced to 200 Ohms) |
| 26-30 MHz | 67-600 Ohms (3:1 VSWR Referenced to 200 Ohms) |
| Long Wire Antennas: Feedpoint impedances up to 5:1 VSWR referenced to 50 ohms. Also, 5 :1 referenced to 200 ohms with the Drake B-1000 balun (3:l on frequencies above 26 MHz). |
| Power Capability: 200 Watts average, continuous duty. |
| Meter: Reads VSWR or Forward power, O-300 watts. |
| Wattmeter Accuracy: *5% of reading *l% of full scale. |
| Dimensions: Height = 4-17132" (11.5 cm) Width = 13-3132" (33.26 cm) Depth = 8-1/2" (21.6 cm) Including Connectors. Weight = 8 lbs. (3.6 kg) |
| Front Panel Controls: Provides for the adjustment of resistive and reactive tuning and VSWR calibration, antenna switching, range switching, and selection of forward watts or VSWR functions of the meter. |
| Rear Panel Connectors: four type SO-239 coaxial connectors (one for input and three for output), three screw terminal connections (for long-wire and open-wire feedline systems), and a ground post. |
