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RF Logic Limited.
Unit 18, The Enterprise Centre,
Coxbridge Business Park, FARNHAM,
Surrey GU10 5EH
Tel +44 (0)1252 268340
Email: sales@rflogic.co.uk
web: www.rflogic.co.uk
The model RF257 modulation meter has been designed to simplify the task of modulation
measurement. The model RF257 always locks to the highest level signal available, ignoring spurious
signals and harmonics. AM and FM measurements can be made over the full frequency range of 1.5MHz
to 2.0GHz. The unit operates usefully with reduced sensitivity to at least 4GHz.
FM measurement of peak positive, peak negative or mean deviation, with 5 deviation ranges from 1kHz
to 100kHz full scale. AM measurement of peak, trough or mean in percentage modulation with 5 ranges
from 1% to 100% full scale. The audio measurement bandwidth is selectable and the demodulated audio
is available at the front panel. The IF is available on a BNC connector on the rear panel.
The unit is small and lightweight, making it ideal for the bench or field work, especially with the internal
battery option installed.
Automatic Modulation Meter
Model RF257
Operator Manual
Model RF257 Automatic Modulation Meter
Electronic Product Design
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Summary of Contents for RF Logic RF257
- Page 1 Operator Manual Model RF257 Automatic Modulation Meter The model RF257 modulation meter has been designed to simplify the task of modulation measurement. The model RF257 always locks to the highest level signal available, ignoring spurious signals and harmonics. AM and FM measurements can be made over the full frequency range of 1.5MHz to 2.0GHz.
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Page 2: Power Requirements
'ON'. The instrument is immediately ready for use; no warm-up time is required. At power on, the RF257 defaults to the FM 100kHz range with the mean detector and the 3.5kHz filter selected. - Page 3 FM Measurement. Select the FM mode with the 'MODE FM' pushbutton. Select the appropriate 'RANGE' with the < > pushbuttons. Five ranges are available with full scale deviations of 1, 3, 10, 30 and 100kHz. Select the required 'AF FILTER' with the < > pushbuttons. Five filter functions are available; three bandpass filters with nominal upper cut-off frequencies of 60kHz, 15kHz and 3.5kHz;...
- Page 4 RF257 SPECIFICATION RF Input Frequency Range 1.5MHz to 2.0GHz and a useful response, with reduced sensitivity, to at least 4GHz. 50 Ω nominal. Impedance Level 2mV to 1V rms Full specification for noise, accuracy etc applies over the input range 10mV to 1.0V Max Input 0.5W continuous.
- Page 5 3.5kHz Filter 250Hz - 3.5kHz ± 0.5 dB 12Hz - 4.0kHz ± 3 dB typically. HF roll off at 100 dB/decade. Psophometric Complies with CCITT Volume V P53 750μs de-emphasis. De-emphasis 3 dB bandwidth typically 12Hz - 212Hz. HF roll off at 12dB/decade. Front Panel AF Output Front panel BNC.
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