Aeroflex 2946A Manuel d'utilisateur télécharger pdf (Page 4)

400 MHz

Difference of Depth of Modulation (DDM)

0-45% glideslope, 0-25% localiser in 0.1% steps

limited by SDM

Selection

Keyboard entry and variation of rotary control

Localiser Presets

0, 4.6, 9.3 and 15.5% DDM

Glideslope Presets

0, 4.5, 9.1 and 17.5% DDM

Accuracy of DDM

At 0 dBm 0.001 DDM (20% depth)

Tone Frequencies

90 Hz and 150 Hz (either tone can be suppressed)

Additional Modulation

1020 Hz ident signal available on 0 DDM on ILS

from an internal modulation source

VOR MODE

9.96 kHz Sub-Carrier Range

0-99.0% in 0.1% steps

Modulation

FM by a 30 Hz tone with 480 Hz deviation

30 Hz Tone Range

0-99% in 0.1% steps

Bearing Control

Relative phase of the 30 Hz tone and sub-carrier

modulation adjustable from 0 to 360° in 0.1° steps

by entering VOR bearing. Bearing can be entered as

TO or FROM the beacon.

Automatic VOR Test

Bearing automatically increments in 0.1° steps

Bearing Accuracy

±0.5°

Additional Modulation

Ident signal (1020 Hz). Available on 0° bearing from

an internal source

SELCAL MODE

Provides amplitude modulation with SELCAL tones

Data Entry

By table selection of 2 pairs of characters

labelled ‘A’ to ‘S’

Timing

1 s tone duration, 250 ms gap

MARKER BEACON MODE

Provides default modulation of 95% AM depth on a

75 MHz carrier at the rate of 400 Hz (outer

beacon), 1.3 kHz (middle beacon) or 3 kHz (inner

beacon). AM depth, carrier frequency and

modulation frequencies can be changed from default

values.

FREQUENCY

Frequency Range

400 kHz to 1.05 GHz

Resolution

10 Hz

Indication

10 digit display

Setting

Keyboard entry, delta increment/decrement function

and rotary control

Accuracy

As frequency standard

OUTPUT LEVEL

Output Level Range

Rx Test:

N-Type socket: -141 dBm to -21 dBm

BNC socket: -115 dBm to +5 dBm

(overrange to +7dBm)

Resolution

0.1 dB

Indication

4 digits plus sign (dBm, dBµV, µV, mV PD/EMF)

Accuracy

±2 dB for level above -127 dBm on N-Type socket

up to 1 GHz

Reverse Power Protection

N-Type: 50 W continuous, normal operation. 150 W

for 1 minute at 20 °C.

Overload indicated by audible and visual warning.

BNC: 5 W Overload indicated by audible and visual

warning.

Output Impedance

Nominally 50 Ω

VSWR

N-Type

Better than 1.2:1 up to 500 MHz

Better than 1.35:1 up to 1.05 GHz

BNC

Better than 2.2:1 up to 1.05 GHz

SPECTRAL PURITY

(If you require even better spectral purity than that

specified here, please consider the 2948)

Residual FM

Less than 15 Hz RMS (0.3 to 3.4 kHz) up to

500 MHz

Less than 20 Hz RMS (0.3 to 3.4 kHz) up to

1.0 GHz (with OCXO)

Harmonics

Better than −20 dBc

Spurious Signals

Better than −30 dBc (±10 kHz to 1.5 MHz offset

from carrier frequency or over range 600 to

700 MHz).

Better than −40 dBc from 400 kHz to 1 GHz

SSB Phase Noise (20 kHz offset)

Better than -95 dBc/Hz up to 1 GHz

RF Carrier Leakage

Less than 0.5 µV PD generated in a 50 Ω load by a

2 turn loop 25 mm from the case. Output level less

than −40 dBm into a sealed 50 Ω load.

AMPLITUDE MODULATION - INTERNAL

Frequency Range

400 kHz to 1.05 GHz

AM Depth Range

0 to 99%

Resolution

Indication

2 digits

Setting

Keyboard entry, delta increment / decrement

function and rotary control

Accuracy

For carrier frequencies from 1.5 MHz to 400 MHz

± 7% ± 1digit for modulation frequency of 1 kHz.

± 10% ± 1 digit for modulation frequencies from

50 Hz to 5 kHz.

±15% ±1 digit for modulation frequencies from

50 Hz to 15 kHz.

Distortion

Less than 2% at 1 kHz for 30% AM, CCITT weighted

Modulation Frequency

20 Hz to 20 kHz

AMPLITUDE MODULATION - EXTERNAL

Input Impedance

Nominally 10 kΩ in parallel with 40 pF

Frequency Range

As internal AM

Modulation Frequency Range

As internal AM

Sensitivity

1 V RMS for 100% AM

FREQUENCY MODULATION - INTERNAL

Frequency Range

400 kHz to 1.05 GHz

Maximum Deviation

75 kHz

Indication

3 digits

Setting

Keyboard entry, delta increment/decrement function

and rotary control

Accuracy

(1)

±5% ± 10 Hz at 1 kHz modulating frequency.

±10% at modulating frequencies from 50 Hz to

15 kHz.

Distortion

Less than 1% at 1 kHz for deviation of 5 kHz, CCITT

weighted

Modulation Frequency Range

20 Hz to 25 kHz

Resolution

25 Hz

Pre-emphasis

750 µs selectable

FREQUENCY MODULATION - EXTERNAL

Input Impedance

Nominally 10 kΩ in parallel with 40 pF

Frequency Range

As internal FM

Modulation Frequency Range

DC to 100 kHz

Pre-emphasis

750 µs selectable

Sensitivity

1 Volt RMS for 0 to 75 kHz deviation

MICROPHONE INPUT

Input Level

2 mV to 200 mV (AGC levelled)

Input Impedance

Nominally 150 Ω

Press To Talk (PTT)

When using the optional microphone in Tx Test

mode, the PTT will switch instrument to Rx Test.

Input Impedance

Nominally 1 MΩ in parallel with 40 pF

Frequency Range

DC and 20 Hz to 50 kHz

AC only 20 Hz to 50 kHz

Level Ranges

0 to 100 mV to 0 to 100 V RMS in a 1, 3, 10

sequence.

Digital readout also in mW (user selectable)

Resolution

1 mV or 1% of reading

Indication

3 digits and bar-chart

Audio Voltmeter

RF Signal Generator

1 2 3 4 5 6 7

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Aeroflex 2946A Manuel d'utilisateur Page 4

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