Note
The Nye Viking MB-V-A antenna impedance matching network is a Pi network system consisting of a large variable, silver plated copper ribbon inductor with a split section, high voltage variable capacitor and a bank of high voltage fixed capacitors to provide a wide range of input-output impedance ratios.
Output terminals are provided in the rear for two 50 or 72 ohm output cables at connectors "A" & "B" and three porcelain cone feedthru insulators. Two of the feedthrus are for balanced line feeders at "D" and the single wire output at feedthru "C".
A five position switch is provided for all antenna switching.
– (A Direct)-- Connects the transmitter output directly to Coax "A", bypassing the tuner.
– (A)-- Connects the tuner output to Coax "A".
– (B)-- Connects the tuner output to Coax "B".
– (C)-- Connects the tuner output to single wire output "C".
– (D)-- Connects the tuner output to twin lead output "D".
CAUTION: DO NOT OPERATE THE ANTENNA SWITCHES WITH POWER ON.
Frequency range is 3.5-30 MHZ (80-10 meters) with limited coverage of the 1.8-2.0 (160 meter) band.
An automatic SWR meter is provided for direct reading of SWR in fine graduations from 1:1 to 20:1, and a Forward Power Meter with switching scales for monitoring the antenna tuning process.
The MB-V-A will handle power in excess of 3000 watts PEP sideband and CW with a continuous rating of 1500 watts into loads between 40 and 2000 ohms impedance with an SWR reading below 1.1:1.
A three kilowatt, trifilar wound, broad band balun provides balanced output to twin lead feeders 100 to 1000 ohms resistance and unbalanced output impedance down to 20 ohms at the Coax "A" & "B" outputs.
The unit features 2 1/4" tuning knobs with 4 dials; a 1 to 25 vernier readout over 360 degrees on the variable inductor tuning plus 360 degree readout on the variable capacitor. The extra heavy gauge aluminum cabinet provides adequate shielding.
The input connector from the transmitter or linear amplifier is a standard SO-239 UHF connector and the output terminals are high voltage porcelain feedthru's and SO-239 Delrin UHF coax connectors for 50 or 72 ohm coaxial cables.
