radiotelephone test assembly smdu

L&SCHWARZ

Data sheet

249310

E-1

SMDU

RADIOTELEPHONE

TEST ASSEMBLY SMDU

0.14 to 1050 MHz (525 MHz without options)

The accurate, value-for-money test system combining versatility with operating ease

• Optimum spectral purity for two-source measurements according to CEPT, EIA and BPO standards

• Suitable for AM/FM radiotelephones in all power ranges

• Rapid and precise measurements in accordance with all standard test methods

The ideal system for every application

The Radiotelephone Test Assembly SMDU incorporates all the necessary instruments for both receiver and transmitter testing and is available in a number of versions.

For testing FM radiotelephones, the RT Test Set

SMDU 249.3011.56is recommended. This brings all the necessary equipment together in a single cabinet and, like all the other versions, can be extended for frequencies up to 1050MHz by means of options.

Test assemblies for purposes other than RT testing, or for combined measurements,can be built up from one of the basic SMDU models (which already contain various different instruments), options and add-on units such as the power test adapter (for FM) or the AM unit (for AM and FM). Special units are also available for testing avionics equipment (see page 4).

The signal generators and their application areas are listed in table 1 on page 3.

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Figure 1 SMDU 249.3011.56test assembly for FM radiotelephones in a single cabinet

-2-

Application Model

Further information in data sheet

AM/FM

AM/FM airborne VOR/ILS and communication

Airborne VOR/ILS communication

Low-cost radiotelephones

AM radiotelephones and stereo broadcast receivers

(in combination with CB sets) radiotelephones, signal

General-purpose equipment and equipment generator signal generator

Radiotelephone model

Radiotelephone model

Radiotelephone and air-navigation model

Air-navigation model

Standard model

Universal model

249.3011.06

249.3011.09

249.3011.07

249.3011.08

249.3011.02

249.3011.04

All models are suited for use as the interfering source in two-source measurements

Table 1 The models in the SMDU signal-generator family and their applications in radio engineering

249 311

249 301 and 249 311

249 301

249 301

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Models SMDU02, 04 and 08 are described in detail in separate data sheets. The main characteristics of these models are given in table 2.

Model Modulation specially suited for

Modulation generator

Output

SMDU 02

-

0.4 and 1 kHz

15 Hz to 150 kHz

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SMDU 04 Stereo broadcasting 5 mV to 1 V

SMDU 08 Stereo broadcasting and VOR/ILS signals

15 Hz to 150 kHz 5 mV to 1 V

Table 2 Characteristics of general-purpose signal-generator models SMDU02, 04 and 08

Autoranging modulation meter and AF voltmeter no yes yes

Options

All models of the SMDU can be fitted with the following five mutually independent options.

The options can be ordered together with the signal generator or added later as required.

This option is fitted as standard equipment in the Radiotelephone Test Assembly SMDU 249.3011.56.

Long-term frequency stability is improved to that of a synthesizer while the high spectral purity of a free-running oscillator is maintained. Operation is greatly simplified by the channel-stepping facility with switch-selected steps of 12.5, 20, 25, 50, 100 or 150 kHz and by the wide-ranoe, high-resolution electronic fine tunina.

SMDU

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Figure 2 SMDU models 04 and 08

This option is fitted as standard equipment in the Radiotelephone Test Assemblies SMDU 06, 07, 09 and 56. It protects the RF output of the signal generator against

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externally applied power of up to 50 W.

3 249 310

249 310

SMDU

Add-on units

Model SMDU249.3011.56is supplied as a fully equipped

RadiotelephoneTest Assembly.The remaining models can be equipped for radiotelephone and air-communication equipment testing by combining them with a number of add-on units. For special applications, such as antenna testing and sequential-tone measurements, further instrumentation is available (see pages 7 and 15).

VOR/ILS UNIT

•••..SMDA-Z 214.3115.02

The VOR/ILS unit is for use in all measurements on

VOR/ILS receivers according to the ARING and RTCA recommendations (see data sheet 249311).

VOR/ILS UNIT

•••..SMDA-Z 214.3115.10

This model of the VOR/ILS unit includes a decade

DOM (difference in depth of modulation) switch. The switch can be set in steps of 0.001 DDM.

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POWER TEST ADAPTER

SMDU-Z2 242.4012.52

This unit permits matched connection of the radiotelephone to the test assembly, further signal generators (for multi-source measurements) and to an analyzer. It also permits switchover between receiver and transmitter measurements without reconnection of the cables. The power test adapter, which is standard equipment in the SMDU56, is a particularly economic way to provide these essential functions.

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Radiotelephone Modes: connector receiver measurements power/frequency/deviation analyzer measurements

Connector for frequency meter, deviation meter and third signal generator

Connector for signal generator

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Power indication rapid settling wide indicated range

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Connector for analyzer and second signal generator

Figure 3 The power test adapter for the SMDU

(see also data sheet 242201)

• TEST ASSEMBLY

FOR AIRBORNE VOR/ILS

AND COMMUNICATION EQUIPMENT

The outstanding advantage of this test assembly for air-navigation receivers is the built-in monitoring facility. The complete system for testing VOR/ILS receivers thus comprises an AF generator, an RF generator and a monitor. Other features of the test assembly are self-test and calibration facilities by means of which the accuracy of the modulationdepth, DOM-null and VOA-phase measurements can be checked and restored as necessary (see data sheet 249311).

AM UNIT

•••..SMDU-Z1

242.2010.53(60-W model)

242.2010.52(30-W model)

The AM unit makes for even greater operating ease and provides the additional function of modulationdepth measurement. The AM unit is available in 30-W and 60-W models, and differs from the power test adapter through the additional features shown in figure 4. Also provided are recorder outputs for the carrier voltage and the modulation depth. In both cases a DC output voltage of 1 V

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corresponds to full scale on the front-panel meter.

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Two time constants for AM indication

Figure 4 The AM unit for the SMDU

(see also data sheet 242201)

Modulation-depth ranges of

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-4-

Figure 6 VOR/ILS test assembly

SMDU

High-accuracy, cost-effective radiotelephone

. testassembls

This third generation of radiotelephone test assemblies is the result of many years' experience in the field.

The Radiotelephone Test Assembly SMDU is ideal for all measurements in development, test department, production and servicing. Its low price makes the

SMDU an attractive solution in all such applications.

The convenient operating controls and the provision of semi-automated test routines make for great rationalization of the measurement process. Even in measurements involving a number of error sources is the overall accuracy of the result assured. Thus, for example, in the measurement of SINAD sensitivity according to the method of CEPT, the errors of level meter, deviation meter and voltmeter, range switchover and SINAD filter are all taken into account. The worst-case error in making this measurement with the SMDU is less than 3 dB, less than half that of the test sets normally used. Since the AF voltmeter uses a true rms rectifier, as specified in the test method, no additional error is thereby introduced.

Although it would be possible to manufacture cheaper test assemblies by not taking account of these measurement specifications, the use of such equipment, even for servicing purposes, would be of dubious value. Where required, the SMDU incorporates instruments of an accuracy found previously only in specialized, separate units. The test assembly is already in use by many national authorities with responsibility for radio traffic.

The SMDU 06, for example, is registered with the Deutsche Bundespost under the number 27609415,and the AM Unit SMDU-Z1 under the number 276094155.

• COST EFFECTIVENESS

The SMDU combines the necessary measurement accuracy with an attractive price. The test assembly makes use of many of the subassemblies of the signal-generator family of the same name, thereby gaining the advantage of advanced design techniques and permitting high-volume production and automated.testing. The SMDU is conceived in such a way as to permit the multiple use of many subassemblies and the cost-saving fulfilment of varying measurement requirements through the creation of different models of the basic signal generator. The possibility of later extension by the incorporation of options has also been foreseen from the design stage. Thus, for example, the SMDU 09 is suitable for testing highquality stereo-broadcast receivers combined with

Citizens' Band radiotelephones for use in cars.

• WIDE FREQUENCY

AND LEVEL RANGES

The test assembly has a frequency range of 0.14 to

525 MHz which may be extended to 1050MHz by the addition of option SMDU-B3 or SMDU-B5. This range covers all present and planned radiotelephone bands as well as many other services, and is also adequate for broadband measurements.

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Level range 0.1 µV to 0.5 V EMF

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FM modulation distortion measured with a distortionfree modulating signal of 15 Hz to 53 kHz as a function of frequency deviation

The extremely wide range of the output-signal level

(0.05µV EMF to 2 V EMF) covers all possible requirements, from the testing of high-sensitivity receivers to overdriving, blocking and similar situations where a high voltage is necessary. The excellent level accuracy throughout the entire frequency range is illustrated in figure 8.

• HIGH SPECTRAL PURITY

The high spectral purity of the output signal allows

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5 249310

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SMDU

249310 even the maximum output level to be used for critical receiver measurements(see back page of data sheet).

Such situations occur during, for example, dynamic adjacent-channel and image-frequency measurements, as well as in intermodulation, crossmodulation and blocking investigations. The use of very steep filters in the Frequency Extension SMDU-B3 guarantees high suppression of spuria even up to 1.05MHz.

All SMDU models are suitable for use as the interfering generator in multi-source measurements, the low cost of the standard model (SMDU02) making it

. particularly attractive for this role.

scale is arranged horizontally for ease of reading.

It is marked in all the level scales necessary to permit measurementsaccording to all standard test methods without any need for conversions.

•AF GENERATOR AND MODULATION

The modulation controls are provided, where appropriate, with coarse and fine adjustments to permit exact setting in all operating modes. Together with the autoranging feature of the meter and the mode indicator lamps, this makes for very simple operation and rapid measurements.

o·perating ease

•TUNING

The SMDU can be tuned through its entire frequency range without having to reverse the direction of rotation of the tuning knob. This feature, together with the combined digital/analog scale and the optimized gearing of the coarse/fine tuning drive, permits much quicker frequency setting than a row of decade switches.

Rapid frequency setting is particularly valuable when searching for signal and interference frequencies which are not precisely known.

When the optional Synchronizer SMDU-B1 is incorporated (standard with the Radiotelephone Test

Assembly SMDU249.3011.56)the tuning can be simply stepped to the next channel (channel spacing selected by a front-panel switch) by slightly turning the finetuning knob. The digital frequency display and the

· control-range indicator clearly show the step change in frequency. When the synchronizer is used without fine tuning the frequency can be set in multiples of the chosen channel spacing throughout the entire frequency range; when fine tuning is selected synchronized adjustment of the frequency to any intermediate value is also possible. The tuning range is always more than

±

60

O/o of the selected channel spacing. The coarse/fine electronic tuning permits very accurate frequency setting, the sensitivity being

0.1

O/o of the channel spacing per revolution of the tuning knob. The output frequency of the signal generator is indicated on the digital frequency counter at all times, including during synchronized operation.

• LEVEL SETTING

The single-range output attenuator permits the signal level to be quickly set to any value with no jumps and without having to .reverse the direction of rotation of the setting control. This method has distinct advantages over other arrangements using coarse range switches and fine variable attenuators. Above all, the single-range attenuator results in much faster measurement of parameters such as sensitivity, adjacentchannel selectivity, intermodulation and crossmodulation. The continuous level adjustment also eliminates all problems related to the measurement of squelch performance or AGC response.

The calibrated, 1OdB/turn scale on the rotary attenuator knob permits rapid and accurate setting of specific level changes such as 6 or 10 dB. The main

• FREQUENCY MEASUREMENTS

The direct-reading seven-digit frequency meter has sufficient accuracy and resolution for use even on frequency processing stages whose errors are magnified in the final frequency as a result of frequency multiplication.

A mixer incorporated in the test assembly beats the signal from the test item with the synchronized output of the signal generator. The resulting difference frequency can be monitored on headphonesor displayed by the digital frequency meter, a technique which is often valuable when adjusting circuits such as crystal oscillators.

The high sensitivity of the frequency meter (typically a few millivolts) permits non-interacting, non-contact measurements using loops, probes or antennas.

Remote frequency measurements on mobile transmitters are also possible.

• FREQUENCY-DEVIATION

MEASUREMENT

In the deviation meter, the signal is first mixed with the main oscillator frequency and then with the output of a second, automatically tuned oscillator. There is no need for separate tuning during deviation measurements on simplex and duplex systems as long as the signal generator is tuned to the receive frequency of the radiotelephone or to between 4 and 10 MHz from its transmit frequency. This feature is particularly time-saving when multi-channel sets are being tested. Even spurious deviation can be measured thanks to the low internal noise of the meter circuit.

Conventional methods of measuring deviation during relay operation of a radiotelephone require an independent deviation meter. The new technique used in the SMDU cancels the effect of the signal-generator FM during the mixing process, thereby making the time-consuming and costly extra deviation meter unnecessary.

• SIMULTANEOUS INDICATION

OF PARAMETERS DURING

TRANSMITTER MEASUREMENTS

During transmitter measurements the frequency, power and frequency deviation/modulation depth are all indicated simultaneously. With the AM unit, the power-measurement range is selected automatically.

No additional adjustments are required on changing the channel frequency, thus making it possible to record the test results.

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Directional Power Meter NAUS

SMDU

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Figure 10 Radiotelephone test assembly {brown) with possible extensions

Extending the test assembly

The Radiotelephone Test Assemblies SMDU incorporate all the instruments required for normal servicing (see block diagram on page 12).

In practical situations, the investigation of poor radio communications involves further measurements for checking the special, interference-determining items of the equipment specifications. Consideration must also be given to the possibility that working conditions alone are responsible for the disturbed communication. It is therefore advantageous that test assemblies, even when used only for servicing, may be easily extended to permit, for example, two-source measurements. An important parameter such as adjacentchannel selectivity can only be measured using a two-source technique. Thanks to the direct connections for a second signal generator and an analyzer, extension of the SMDU Radiotelephone Test Assembly is very straightforward. For special measurement problems, a comprehensive range of additional equipment can also be supplied (see page 15).

• RECORDING FACILITIES

Printing or recording of the results of all transmission measurements is made possible through the provision of a number of test outputs:

BCD output of the digital frequency meter, DC output of the indication on the meter associated with the modulation generator, AC output from the deviation meter, DC outputs proportional to the carrier voltage and the modulation depth at the AM unit SMDU-Z1.

Further equipment, such as a suitable digital voltmeter as AID converter, or a D/A converter for charting the frequency, may be added to the recorders.

-7249 310

SMDU

Operating controls ·.·._

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SYNCHRONIZER

Locking range indication

Electronic

FREQUENCY METER

Frequency switchover internal/external

Digital display AF to UHF l l -

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Range indication

POWER METER

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249 310

Figure 11 SMDU Radiotelephone Test Assembly with AM Unit SMDU-Z1

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AM MODULATION-DEPTH METER

- 9 -

249 310

SMDU

Test connectors

SWEEPING AF MEASUREMENTS

Frequency•

Voltage •• distortion with/without CCITT filter

AF generator •

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RF voltage from radiotelephone•

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Radiotelephone

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Third • signal generator

Antenna, probe for• deviation and frequency measurements

RF MEASUREMENTS

Note

For all standard measurements requmng only one signal generator only the connectors marked (»-are are marked *.

used. Connectors fitted to the AM unit but not to the power test adapter

AC POWER outlets for additional units,

SMDU-Z1 and SMDA-Z

CRYSTAL external reference input

Second

RF output without AM•

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BCD output freq. meter

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AF voltmeter

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Demodulated RF output carrier voltage and mod. depth of signal generator of radiotelephone

RECORDING

• BNC sockets

•• Connector for supplied accessories

• Mating connectors, see bottom of page 11

10 -

249 310

Figure 12

SMDU

Applications

Application

Transmitter measurements

Frequency accuracy

Transmit-frequency offset

Power

Frequency deviation

Setting of deviation limiting

Amplitude/frequency response

Harmonic distortion

Call-tone measurement

Modulation depth

(assembly with SMDU-Z1)

Limiting

Receiver measurements

Sensitivity

Frequency accuracy and bandwidth

Limiter action

Squelch action

Amplitude/frequency response

Harmonic distortion

Measurements on duplex sets

Duplexer loss

Receiver sensitivity

Relay operation

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Special transmitter measurements

Spurious emissions

Recording of frequency, power, modulation, distortion

Remote frequency and deviation measurement

Measurements on sequential tones

Remarks

Automatic overload protection of signal generator

Immediate display on digital frequency meter

Rapid crystal adjustment without annoying detuning

Frequency difference can be displayed on SMDU

Simultaneous indication of frequency, power and deviation

Semi-automatic tuning

Close tolerances permit full deviation of radiotelephone to be used

Continuously tunable AF generator

Direct indication of distortion at 1 kHz

1-Hz resolution

Measurement simultaneous with indication of power and frequency

Direct indication of distortion at 1 kHz

May be evaluated together with distortion measurement

S/N and SINAD measurements, with CCITT weighting or unweighted

High resolution on digital frequency meter

(10 or 100 Hz), wide-range electronic fine tuning

Single-range output attenuator

No problems with squelch hysteresis thanks to single-range attenuator

May be measured with frequency or phase modulation

Direct distortion measurement at 1 kHz

No additional instruments required

Power indication with simultaneous sensitivity measurement

Automatically tuned deviation meter for relay operation

Direct connection of analyzer

Test outputs provided

Measurements possible up to distances of approx. 50 m

Detailed investigations on sequential-tone demodulators

Special receiver measurements

Same-channel suppression

Adjacent-channel selectivity

Spurious responses

Intermodulation

Desensitization (blocking)

Spurious emissions

Narrow-band sweeping (±100 kHz)

)

High signal-to-noise ratio and spurious suppression permit measurement of even the most extreme values

Channel-stepping makes tuning of adjacent channel very easy, direct connection for second signal generator

Direct connection to test assembly

Checking of IF stages

Measurements on AF section

Complete level-measuring set with AF generator and voltmeter

Cables and connectors

(to be ordered separately, see also data sheet 902100)

RF connecting cable 100.6945.05(BNC connector, 0.5 m)

RF connecting cable 100.6945.10(BNC connector, 1 m)

RF connecting cable 100.6945.20(BNC connector, 2 m)

RF connecting cable 100.7670.10(50

Q,

N male connector, 1 m)

Connector for DEMOD. OUTPUT FO 018.5356

Connector for 50-pole recorder output FM 018.5904

Extension

Headphones (optional)

Analyzer, e.g. EZF-EZFU

Recorders,

A/D and D/A converters

Antenna, probe

Sequential Tone Programmer SSN-Z and Precision LF Generator SSN

Second signal generator

SMDU 02 (standard): low-cost, high-quality solution

Analyzer

Oscilloscope

- 11 -

249310

SMDU

249310

System configuration

The list below gives the instruments which are incorporated in the SMDU RadiotelephoneTest Assemblies.

The version SMDU 249.3011.56consists of the signal generator, with synchronizer option, and the power test adapter in a common case.

•INTEGRATED INSTRUMENTS

AM/FM signal generator

0.14 to 525 MHz (1050 MHz with option) with high spectra] purity, stability and accuracy.

Synchronizer (option)

For crystal-accurate frequencies. Permits channel stepping and electronic fine tuning by up to 150kHz.

Digital frequency meter

15 Hz to 525 MHz (1 GHz with option). Displays the

RF and AF frequencies of the signal generator and the test item.

Mixer

Generates the beat frequency between the radiotelephone output and the signal generator output for frequency-offset measurements and the like.

Deviation meter

Features semi-automatic tuning to the transmit frequency in simplex, duplex and relay operation of the radiotelephone. Suitable for frequency and phase modulation; separate measurement of positive and negative deviation peaks. Automatic rms weighting of spurious deviation.

Power meter

10 mW to 30 W (60W). Autoranging on AM unit.

Power RF attenuator and R/T switchover

For matching the radiotelephone transmitter to the deviation, frequency and power meters. Automatic switchover between transmitter and receiver measurements with AM unit.

Multi-way distributor

For connection of further signal generators and an analyzer.

Modulation-depth meter (with AM unit)

AF generator

30 Hz to 30 kHz plus six standard frequencies for modulation of the signal generator or the radiotelephone. Also suitable for general AF measurements.

AF voltmeter

Autoranging in all indication modes.

Psophometer

For signal-to-noise ratio measurements. Weighting according to CCITT.

SINAD-ratio meter

Automatic indication of the standard SINAD ratio (6,

12 or 20 dB) falling within the selected measurement range.

Distortion meter

Measurementat 1 kHz, range 0.5 to 50%. CCITT filter may be introduced.

Automatic overload protection

Protects the signal generator against reverse power flow should the talk button of the radiotelephone be accidentally pressed.

Recorder outputs

BCD output of frequency, analog output of meter indications.

r::=·----

• SMDU radiotelephone model

Beat frequency measurement

I BCD

·-·-·-·-·-·---i

Freq.

meter

15 Hz-

30 MHz

[> .;·.

<J

H.

AF logic

Autoranging

___ ,____ ator

Figure 13 Block diagram of the RT Test Assembly i

:-t----l

I .

. I

I .

. I

I .

.)

I

AF

~

~

RF Input/output

I

_,

,

.

I

1•

I .

L___

~

Receiver i i

!

L

AF voltmeter

AF generator

1

1

'

i '

1·

!

i

!

_J i

Loudspeaker

I

) output • J

I

Notes

*

OPTIONS

Standard equipment in Radio-

I

.

"L

-

_J

telephone Test Assembly SMDU 249.3011.56

·

I

• Only in AM Unit

- 12 -

SMDU

Specifications

Frequency

without options with option

Reference crystal,

internal or external

. 0.14 to 525 MHz

. 0.14 to 1050MHz

. 10 MHz, aging 5X10-•/month

Resolution

of display 0.14 to 50 MHz

1 or 10 Hz

50 to 800 MHz

10 or 100 Hz

800 to 1050MHz

0.1 or 1 kHz

Tuning modes and frequency instability

Channel spacings

Tuning range

Warmup time

Measuring interval

Temperature change

0.14 to 200 MHz

200 to 525 MHz

525 to 1050MHz

Free-running unsynchronized none unlimited

10 min

5 min none

<3 kHz

< 4 kHz

< 8 kHz

3h

10 min none

< 1.5 kHz

< 3 kHz

< 6 kHz

}

locked with fine tuning

12.5/20/25/50/100/150kHz

12.5/20/25/50/100/150kHz + 0, -1 steps equal to channel spacing

20 to 160 kHz according to channel spacing

15 min 1 h 15 min

1 h

10 min

1

=c

1 h

1

=c

10 min

1

=c

1 h

1

=c

< 5 X 10-a + 10 Hz

With synchronizer

1)

}

< 100 Hz

< 5 x10-

7

Spectral purity

Signal-to-noise ratio with 1 Hz measuring bandwidth approximately 140 dB; see figure 9 on page 5.

Frequency

MHz

0.14 to 50

50 to 395

395 to 525

525 to 1050

2)

525 to 1050

3)

Harmonics suppression

(<1VEMF) dB

> 26 (typ. 30)

> 35 (typ. 40)

> 35 (typ. 40)

> 26 (typ. 30)

> 20 (typ. 26)

Spurious suppression dB

< 200 MHz > 200 MHz from carrier from carrier

>90

> 110

> 110

> 110

>100

Spurious frequency deviation

Spurious depth

Hz

CCITT weighting

CCIR weighting

(0.3 to 3 kHz) of amplitude modulation

CCITT

(20 Hz to 15 kHz) weighting

CCIR weighting

> 90 (typ. 100)

<7

> 110 <7

>90

>70

> 20 (typ. 30)

<10

<20

<20

< 20 (typ. 10)

< 20 (typ. 10)

< 40 (typ. 20)

< 60 (typ. 30)

< 60 (typ. 30)

< 10-4

< 3x10-

4

Incidental AM for FM with fmod = 1 kHz .

< 1 % (typ. 0.5 %) at 100kHz deviation (for f > 1 MHz)

Incidental synchronous cpMfor 30 % AM depth

Modulation index .M/fmod

I

I

0.14 to 20 MHz

< 0.02 (typ. 0.01)

RF output

of signal generator

Output EMF or power

Source impedance

VSWR for levels < 0.2 V EMF

Output voltage error (total error)

0.4 to 525 MHz .

remainder of range

I

I

20 to 110 MHz

< 0.1 (typ. 0.05)

I

110 to 525 MHz

I

< 0.2 (typ. 0.1)

N female connector, adaptable

4)

(Dezifix A base)

. 0.05 ~tVto 2 V or -139 to +13 dBm

. 50 Q

< 1.2 (f < 525 MHz); < 1.4 (f > 525 MHz)

<±1 dB

<±2dB

} for 0.1 ~tVto 0.5 V EMF

Overload protection

Maximum permissible power .

.

Maximum permissible DC voltage switches off the RF output if excessive RF power or DC voltage is applied

. 50W

. 50

v

RF output II

(on rear panel) .

Connector

. without AM, > 20 mV into 50 Q

BNC female

%

Frequency meter

(7-digit readout)

Frequency range

15 Hz to 30 MHz

20 to 525 MHz

500 to 1000MHz 5)

Permissible noise voltage•

Voltage ranqe "

10 mV to 3 V

10 mV to 3 V ••

30 mV to 1 V

Maximum Input"

10

10

3V

v v

. 5 mVpp

Resolution

1 or 10 Hz

10 or 100 Hz

10 or 100 Hz

Gate time

1or0.1s

1 or 0.1 s

2 or 0.2 s

Input impedance•

10 kQ

50 Q

50

Q

II

20 pF

• Data valid for direct signal input. When signal is fed via SMDU-Z1 or Z2 measurement range of power meter applies.

•• <

2

V up to 30 MHz and > 15 mV above 470 MHz.

1)

With option

SMDU-B1

5) With option

SMDU-B4

2)

With option

SMDU-B3

3)

With option

SMDU-B5

4)

With the aid of screw-in assemblies the user can easily adapt this connector to other systems; see data sheet 902100.

- 13 -

249

310

SMDU

249310

Specifications

AF generator and modulation

[values in brackets with synchronizer]

AF generator

AF generator or modulation frequency in kHz

Indication/frequency resolution

0.3/0.4/1/2.7/3/6

0.03 to 30 contin.

analog/1 Hz digital

Output voltage/modulation range 1 mV to 5 V into 200 Q

AM

1)

EMF<1V, fc=0.4to400MHz

FM

0.03 to 10 Oto 20

[0.1 to 20)

Oto approx. 98 'lo

< 0.5'lo (0.1 to 1OkHz) <1.5%2)

Oto 10/100 kHz

3)

[< 1500rad]

< 1 'lo

Harmonic distortion/modulation distortion

Measurement range (indication)

Error limits

10 mV to 10V (7 ranges)

± (2 'lo of rdg +1.5 'lo of fsd) above 3 mV

10/30/100'lo

± (4 'lo of rdg +1.5 'lo of fsd) 2)

1/3/10/30/100 kHz

± (5 'lo of rdg +1.5 'lo of fsd)

Phase response up to 3/6 kHz

1)

Double tolerances in range 400 to 525 MHz.

2) For 30 Hz to 4 kHz, m < 80 'lo.

3) cpM

0.3 to 6

0 to 100 rad

M

< 10/100 kHz

< 1 'lo

1/3/10/30/1

oo

rad as FM+ phase response

< 0.2 dB

I<

0.4 dB

Max. deviation 200 kHz above 525 MHz.

Additional data for SMDU 09

FM distortion for 5 to 15 MHz and 86 to 108 MHz and external modulation (fmod= 30 Hz to 53 kHz)

Stereo crosstalk attenuation at 50 Hz/1 kHz/15 kHz .

< 0.2 'lo for deviation of :-::;100 kHz

>

40/46/46 dB (typ. 50 dB)

Additional data for SMDU 07

with < 80 'lo AM (see also data sheet 249311)

AM distortion for 108 to 118 MHz .

for 329 to 335 MHz .

Frequency response

< 0.5 'lo (typ. 0.3

< 0.8 'lo (typ. 0.5

'lo)

'lo)

90 to 150 Hz

s;

2x10-

4

1'.DDM

} fmod =30 Hz to 4 kHz

9 to 11 kHz

< 0.1 dB matched to VOR/ILS unit

15 Hz to 50 kHz

=1 dB

Demodulation output

Amplitude/DC offset voltage

Amplitude/frequency response

Phase error for VOR signals

7 Vpp for 100'lo modulation depth/<±

90 to 150 Hz 9 to 11 kHz

<5 mdB

< 0.01°

< 50 mdB

20 mV

Deviation meter

input data

Modes

Weighting

Ranges

Test frequency/MHz

Modulation frequency .

for tripled indication error with phase deviation

Spurious deviation (CCITT weighting)

Error limits with max. useful deviation of 50 kHz .

for spurious deviation

Symmetry error in ±deviation measurement .

Additional error in phase modulation for sensitivity and impedance see frequency meter positive and negative frequency and phase deviation rms for 10 Hz to 300 Hz peak for 0.3 to 100 kHz

0.1/0.3/1/3/10/30/100 kHz or rad

Simplex Duplex AFC Relay

20 to 525 (1050)

30 Hz to 6 kHz

30 Hz to 15 kHz

10..7and 60 to 525 (1050)

200 Hz to 6 kHz

100 Hz to 15 kHz

0.3 to 3 kHz

300 Hz to 3 kHz

300 Hz to 6 kHz

< 10 Hz < 15 Hz

± (1.5 'lo of rdg + 1.5 'lo of fsd)

± (5 'lo of rdg + 1.5 'lo of fsd) + inherent spurious deviation

< ±1.5 'lo

±

(3

'lo of rdg + 1.5 'lo of fsd)

I

< ± 1.5

'lo < ±1.5 'lo

± 2 'lo {frequency response)

AF voltmeter

frequency range

Measurement ranges

Error limits

Rectifier/weighting filter .

Distortion meter

frequency/range

May be used with

Permissible voltage range

Permissible deviation range

Indication range

Error limits

SINAD meter

frequency/range

Permissible voltage range

Indication range

Error limits

CCITT filter

to CEPT specification

15 Hz to 30 kHz

10/30/100/300mV/1/3/10 V

± (3 'lo of rdg + 1.5

'lo of fsd} rms-responding/CCITT

1 kHz ± 1 'lo

I

0.5 to 30 'lo (50 'lo with doubled error) deviation meter and AF voltmeter

50 mV to 3 V

700 Hz to 40 kHz (note spurious deviation)

1/3/10/100 'lo

± (10

'lo of rdg +1.5

'lo of fsd) +inherent distortion of 0.3 'lo

1 kHz ± 1 'lo/ 6 to 46 dB (double error below 12 dB)

50 mV to 3 V

1/3/10/30/100'lo (illuminated markers at 6, 12 and 20 dB)

± (10'lo of rdg +1.5 'lo of fsd) +inherent noise of 0.3 'lo may be used with deviation meter and AF voltmeter

- 14 -

SMDU

Specifications

Power meter

Measurement ranges .

Error limits up to 500 MHz .

up to 1000MHz

Modulation-depth meter

Measurement ranges .

Input power

Modulation frequency

Error limits

SMDU-Z2

0.05 to 0.3/1/3/10/30 W

I

SMDU-Z1 (30 W)

0.05 to 0.3/1/3/10/30 W

± (6 'lo of rdg + 1.5 'lo of fsd)

± (8 'lo of rdg + 1.5 'lo of fsd)

0.1 to 30 W

I

SMDU-Z1 (60 W)

0.1 to 0.6/2/6/20/60 W

O to 40 'lo

I

I

0 to 100'lo

I

0.2 to 60 W

25 Hz to 10 kHz

± (4 'lo of rdg + 1.5 'lo of fsd)

Power attenuator

Attenuation in receiver/transmitter measurements

RF connector

(for analyzer, additional sources)

Input

I

output attenuation

I

VSWR o+0.6dB/20±1.3dB

I

30± 0.8 dB

I

1.3

I

I o+o.6 dB /26±1.3

dB

General data

Connectors .

Nominal/shelf temperature range

Power requirements .

Front-panel markings

Vibration testing see page 10

+10 to +45 °C/-40 to +70 °c

115/125/220/235V±10 'lo (100 to 120 VA), 47 to 420 Hz

German + English according to VOE 0411

Order designations

Compact test assembly

•••. Radiotelephone Test Assembly" SMDU 249.3011.56

•••.Signal Generator SMDU

Radiotelephone and air-navigation model 249.3011.07

492

x

401

x

434

37

Single instruments for combination as test assembly

•••.Signal Generator SMDU

Radiotelephone model 249.3011.06

492

x

296

x

434 28

•••.Signal Generator SMDU

Radiotelephone model, stereo-compatible 249.3011.09

492

x

296

x

434 28

492

x

296

x

434 28

•••.Synchronizer SMOU-B1 249.6340.02

(including synchronizer front panel)

Dimensions Weight

(WXHXO) mm kg

175X33X235 }

163.5X33X 80

1.2

•••.1.05-GHz Frequency Range Extension

SMOU-B3 249.9484.02

•••.1-GHz Frequency Meter SMDU-B4 250.0012.02

•••.1.05-GHz Frequency Doubler SMDU-B5 275.1312.02

185X208X60

62X225X33

115X208X60

1.0

0.4

0.6

Accessories supplied

Power cable 025.2365.00

Power cable 025.2365.00

Power cable 025.2365.00

Power cable 025.2365.00

•••.AM Unit SMDU-Z1 242.2010.52

(30-W model)

•••.AM Unit SMDU-Z1 242.2010.53

(60-W model)

•••.Power Test Adapter SMDU-Z2 242.4012.52

492X 118X434

492X118X434

492X118X434

0.8

8.5

8.0

)

Power cable 025.2365.00

2 terminations 244.7677.00

Free plug 018.5356.00

RF connecting cable 242.3680.00for

connection to frequency meter of SMDU

As for SMDU-Z1 excluding power cable and free plug

• The single-cabinet compact test assembly consists of the SMDU 06 with option SMDU-B1 and the SMDU-Z2.

Recommended extras

e

Dlrectlonal Power Meter 25 to 1000 MHz, Z

=

50

Q

NAUS 3

Dezifix B or N connectors (range 20 mW to 30 W)

NAUS 4

N connectors (range 50 mW to 110W)

288.8610.55

289.9010.54

e

Standard Frequency Receiver XKD 200 kHz

Sensitivity 2 µV

100.5678.03

e

Analyskop EZF min. resolution 70 Hz/50 Hz

e

UHF Tuner EZFU for 30 to 1400MHz/2700 MHz

e

Sequential Tone Programmer SSN-Z 1 to 9999 Hz

e

Precision LF Generator SSN

e

High-power Attenuator RBU 10 dB/50

Q for 100 W

e

Three-port Junction Box DVU 3 (N connectors, 50

Q)

Four-port Junction Box DVU 4 (N connectors, 50

Q) for large-signal, multi-source measurements up to 1.5 GHz

1oo.8831.25I1oo.8831.52

210.0011.04

I

210.0011.02

274.0012.92

204.8014.52

100.8654.15

100.5203.03

201.4018.03

e

Coupllng Head SMDA-Z (N connector) with isolating capacitor 124.7558.50

e

Cables and connectors

Data sheet

288861

288861

444822

150910

274001

204801

200001

474410

201401 see pages 10 and 11

- 15 -

249310

140 dB/Hz for selectivity measurements

Receiver input selectivity

Unsatisfactory signal generator(< 120dB/Hz)

SMDU (140dB/Hz)

INTERFERING

SOURCE

WANTED

SIGNAL

~DE&SCHWARZ

Muhldortstrafle

15 Posit. (P.O.B.)801469

Printed in the Fed. Rep. of Germany

D-8000 Munchen 80

Subject to change

Tel. (089) 41 29-1 Int. +49 894129-1 · Telex 5 23703

Data without tolerances: order of magnitude only

278 (0)