Note
QST, Jun 1955, p. 101.
Walter Ashe catalog 1957 (probably issued in 1956), p. 10.
QST, Jun 1958, p. 175.
QST, Jul 1958, p. 141. (a few specs)
Allied Radio catalog 1959 (issued 1958), p. 382.
Allied Radio catalog 1960 (copyright 1959), p. 403.
The Harvey-Wells Bandmaster Z-Match is a versatile antenna coupler designed for high-efficiency matching between a transmitter and various antenna systems. It functions as a combination matching device, a 50-ohm dummy load, and a VSWR indicator.
The unit is engineered to provide rapid tuning for both pretuned and random-length antennas. Its core design operates on the assumption that the connected transmitter is intended to tune into a 50-ohm resistive load. The Z-Match simplifies the operator's workflow by allowing for a wide range of frequency coverage without the need to manually switch coils.
Features
– Integrated Dummy Load: Includes a built-in 50 watt dummy load for initial transmitter tuning.
– Triple-Scale Metering: Features a power switch (S1) with three selectable scales for both forward and reflected power:
Scale 1: 0 to 10 watts.
Scale 2: 0 to 100 watts.
Scale 3: 0 to 1000 watts (use as the 100-watt scale multiplied by 10).
– Flexible Output Terminals: Equipped with different output jacks for specific frequency ranges:
J3: used for high-frequency bands (14, 21, 27, or 30 mc).
J4: used for lower-frequency bands (3.5 and 7 mc).
– VSWR Bridge: Includes a factory-aligned bridge for precise matching and minimum reflected power readings.
Specifications
– Frequency Range: 3.5 to 30.0 megacycles
– Input Impedance: 50 ohms
– Matching Range: 10 to 2500 ohms (reactive and nonreactive loads)
– Max Power (Tuning): 50 watts maximum into the dummy load
– Max Power (Operating): Up to 500 watts transmitter input when properly matched
