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Racal 409 Modulation Meter FM
AM Mod Meter
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Modulation Meter Type 409
A wide range highly sensitive instrument, designed to measure percentage amplitude modulation (a.m.) of carriers from
3 - 1200MHz and frequency deviation (f.m.) on carriers from 3 - 1500MHz.
The meter scales for AM are : -
0
- 10%
0 - 30%
0 - 100%
The meter scales for FM are : -
0 - 3k Hz
0 - 10k Hz
0 - 30k Hz
0 - 100k Hz
0 - 300k Hz
0 - 600k Hz deviation.
Outputs at the intermediate frequency (nominally 1MHz) and at l.f. are available at front panel terminals.
An in
built switched noise filter permits measurement of very narrow f.m. deviations using a sensitive external I .f. millivoltmeter.
Changes in mean carrier level when a.m. is applied can be measured to better than 1% accuracy and effective i.f. limiting permits measurement of
spurious f.m. on a.m.
An f.m. calibrator circuit, which can be checked directly on an electronic counter, is provided within the instrument to enable periodical calibration
to be carried out.
Tuning the instrument at very high frequencies has been simplified by the provision of a fine tuning control and a SET l.F. position on the meter switch.
In this position the tuning control is simply adjusted until the meter reads to the SET l.F. mark, thus eliminating tedious peaking procedures.
The instrument is fully stabilised against changes in mains supply voltage of ±10% from the value set on the mains voltage selector.
The power
consumption is approximately 120 VA.
The instrument is supplied in a metal case with
quickly detachable top, base and sides.
A rack mounting kit is available.
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Manual
with Circuits
& Layouts Available
Details Below
As a Download
Click Here
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The Manual Consists
of the Following :-
TECHNICAL SPECIFICATION
DESCRIPTION OPERATION AND MAINTENANCE
INTRODUCTION
INITIAL PREPARATION
OPERATION
Tuning Procedure
Measurement of Amplitude Modulation
Measurement of Change of Mean Carrier Level
Measurement of Frequency Modulation
Monitoring Facilities
FM Calibrator
External Oscillator Facility
Anti - Microphonic Turret Mounting
Measurement of a radiated signal
CIRCUIT DESCRIPTION
General
Input, Mixing and IF Amplifier
AM Measurements
FM Measurements
MAINTENANCE
General
Fault Finding
Preset Controls
Adjustment of RV1
Adjustment of RV1O
Adjustment of RV5
Alignment of the IF Amplifier
Adjustment of RV3, RV6, RV8, RV13 and RV14
Adjustment of RV15
Adjustment of RV12
Adjustment of the Preset Components of the FM
Calibrator
RF Alignment
Voltage Measurements
LIST OF COMPONENTS
ILLUSTRATIONS AND DIAGRAMS
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Manual
with Circuits
& Layouts Available
Details Below
As a Download
Click Here
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Racal 409 Modulation Meter FM
AM Mod Meter
Manuals are Available Worldwide as a
Download.Manual
with
Circuits and Layout images 59 pages
Manual 59 A4 pages worldwide
( For all Payment Options )
( Please Click the Payment Links Below )
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We do all we can to provide
the very best that is available for you.
But in the unlikely event that any data should not be as you expected.
A refund is always available. Kind Regards Allen and Alanna. |
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