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Signalcrafters 70 plc computing swr rf power meter
For Sale: Signalcrafters 70 plc computing swr rf power meter
Subject Signalcrafters 70 plc computing swr rf power meter
Ad is submitted by poster:
The Model 70 is a RF power meter and load mismatch measuring instrument designed for use in PLC systems in the frequency range of 10 kHz to 500 kHz. The Model 70 is calibrated for 50 ohm transmission lines but its use in 40 and 60 ohm systems introduces only minor errors.
The Model 70 will safely handle CW powers of 100 watts over the PLC frequency range of 30 kHz to 500 kHz. Above 40 kHz, 150 watts is allowable. Below 30 kHz, the allowable power declines to 10 watts at 10 kHz.
In use the Model 70 is connected in series with the coaxial feed line between the PLC transmitter and the line tuner. When the PLC transmitter is keyed "on", the Model 70 will display forward power in watts and dBm on one front panel meter. The percent reflected power and standing wave ratio (SWR) are displayed on the other front panel meter.
The two displayed quantities are actually independent and the Model 70, because of its computing circuits, maintains this independence. The result is ease of measurement and complete "hands off" operation. There are no sensitivity or full scale meter adjustments to make during a tune-up procedure.
The internal analog computer computes the ratio of the reflected power to the forward power. Since this ratio relates directly to percent reflected power and SWR but is independent of the magnitude of either, no level or calibration adjustments are necessary.
A complete PDF manual is at the web address below
http:// /Files/Model%2070.pdf
A current product from Signalcrafters at $1500
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Posted By: Carolyn Webb
Contact: CWebb@repair--parts.com (Carolyn Webb) (this is a temporary forwarding address).
