SMD-Pro Demodulator





This RF Demodulator is identical to the SMT-Pro Station Monitor but without the  sampler/coupler. It is recommended for those wishing to use a separate sampler.

This SMD-Pro is intended for (QRP) and higher power (QRO) operation. It includes the optional detector biasing supply.  When combined with an RF sampler, it allows for precise adjustment of the entire transmitter chain with transceiver output of up to 100 Watts driving linear RF amplifiers. It features a high performance demodulator, a variable base band output and an oscilloscope trigger output.

A Linear RF amplifier usually amplifies an RF signal from 20-100 Watts by 20dB or more to about 500-1,500 Watts. Its performance and modulation can be characterized using a spectrum analyzer (expensive) or a low cost oscilloscope using a trapezoid display.

Each SMD-Pro Demodulator comes completely assembled in a premium shielded die cast aluminum alloy A380 housing. Each housing is blue baked enamel per Federal Standard 595 #25109 over primer wash per DOD-P-15328.

datasheet SMD-Prov2

Appnote 1 Trapezoid test(2)

Appnote 6 Station monitor selection(2)

Additional information

Weight 1 lbs
Dimensions 4 x 3 x 1.2 in
Specifications RF

Maximum RF IN: 200W PEP with crest factor of 4: 1 Isolation RF IN/OUT to DEMOD OUT: > 50dB Insertion loss: Negligible VSWR : Less than 1.1:1 Return loss: >25dB Impedance DEMOD RF IN/OUT: 50ohms

Specifications Demodulator

Baseband RF detection: AM and SSB Spurious THD: < -60dB Linearity: .5-100 Watt 1-98% Rise/fall time: < 10us aberrations less than 5% Output coefficient: -20dB externally variable Impedance DEMOD OUT: 47K Impedance TRIGGER OUT: 47K


Generate a baseband signal for the oscilloscope X (horizontal) input by demodulating SSB and AM signals when testing transceiver and RF amplifier using the trapezoid method, especially useful for low level (QRP) testing.


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