Note
Ham Radio, Feb 1973, p. 58.
The Thrulina model 4342 Dual Wattmeter-VSWR Monitor displays the three prime RF transmission measurements at once on a single meter face: Forward and reflected power are indicated by individual pointers and VSWR is monitored on a third scale from the intersection of the two power pointers.
Unlike most VSWR meters, the model 4342 does not require any adjustments to full-scale deflection, or any switching before VSWR readings can be taken: The entire set of three transmission parameters entire set of three transmission parameters is readout simultaneously during operation.
Power and frequency range of the 4342 depend on two plug-in elements selected from more than eighty choices available with the company's popular Thruline Model 43.
Full scale power levels at +5% accuracy range from 10 to 5000 watts for forward indication and 1 to 500 watts for reflected, in discrete frequency bands from 2 to 2300 MHz (for increased resolution, the reverse power element is ten times more sensitive than the forward power element).
Model 4342 Insertion VSWR in 50-ohm systems is a low 1.035 to the point of measurement.
A choice of QC Quick-Change connectors permits mating with N. BNC, TNC, UHF, C, SC, LC, HN, LT, GR type 874 and 7/8" EIA lines without the need for performance-degrading adapters.
References
Brief description. Ham Radio, Feb 1973, p. 58.