General 1362 User Manual

INSTRUCTION

MANUAL

GENERAL

RADIO

Contents

SPEC1 FlCATlONS

TABLE OF CONTENTS

-

INTRODUCTION

SECTION

INSTALLATION - SECTION

OPERATING PROCEDURE -SECTION

APPLICATIONS - SECTION

PRINCIPLES OF OPERATION - SECTION

SERVICE AND MAINTENANCE - SECTION

WARRANTY

We warrant that each new instrument manufactured and sold by us is free from defects in material and workmanship and that, properly used, it accordance with applicable specifications for a period of two years after original shipment. Any instrument or component that is found within the two-year period not to meet these standards after examination by our factory, District Office, or authorized repair agency personnel will be repaired or, at our option, replaced without charge, except for tubesor batteries that have given normal service.

1

2

3

4

5

6

will perform in full

@GENERAL RADIO COMPANY

Concord, Massachusetts,

Form

1362-01 00-8

January, 1971

I

D-B552

U.S.A.

01742

1967

SPECIFICATIONS

Frequency Range: Tuned Circuit: Frequency Accuracy: Warmup Frequency Drift:

Frequency Control:

300°, with a slow-motion drive of about 9 turns.

over

Output Power (into

Type 1267 or 1264 Power Supply, 200

220 to 920 MHz.

Butterfly, with no sliding contacts.

k

1%.

0.2% typical total.

A

four-inch dial with calibration

50

ohms):

At least 160 mW with

mW with Type

1269 Power Supply.

Output System:

A coupling loop feeds a waveguidebelow-cut-off attenuator calibrated over an 80-dB range with 5-dB scale divisions, relative attenuation. Additional uncalibrated range

is

provided. Output adjust-

ment and locking GR 874 output connector are at the

front of the instrument.

Modulation:

An external audio-frequency plate modulator may be connected to the front panel MOD jack. The modulation impedance

is

approximately 3 kn.

sinewave of 20 V rms, amplitude will produce ap-

A proximately

1000

Hz

1311 Audio Oscillator

30%

amplitude modulation. For 400

Hz.

and other audio frequency modulation the Type

is

recommended. The Type 1263 Amplitude-Regulating Power Supply can be used for 1-kHz square-wave modulation, the Type 1264 Modulating Power Supply for square-wave

,or pulse modula-

tion.

Power Supply:

Four types of power supplies are rec-

ommended; the choice depends on the intended ap-

plication. Refer to Table of Accessories, paragraph

1.5.

Tube:

One Y-1266.

Mounting:

Accessories Available:

Dimensions:

(205 by

Net Weight:

Rack-bench cabinet.

Refer to paragraph 1.5.

Width

8,

height 7-5/8, depth 9 1/2 inches

195 by 240 mm). See outline below.

8 pounds (3,6 kg).

GR 874 Patent No. 2,548,457.

Figure

1-1.

Panel view of Type

1362

UHF

Oscillator with accessories

.

TABLE

OF

CONTENTS

Section 1 INTRODUCTION

1.1

Purpose

1.2 Description

1.3 Amplitude Modulation

1.4 Sweep Operation

1.5 Auxiliary Equipment. Section 2 INSTALLATION

2.1 Connection to Power Supply

2.2 Bench Mounting

2.3 Rack Mounting

2.4 Modulator Connection

2.5 RF Output Connections

Section 3 OPERATING PROCEDURE

3.1 Equipment Turn-On

3.2 Frequency Adjustment

3.3 Output Adjustment Section 4 APPLICATIONS

4.1 General

SECTION

1

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4.2 Signal Generator for Receiver Testing.

4.3

1

3 3 3

5 5 7

8

9

10

Local Oscillator in a Frequency Converter.

4.4

Transfer Oscillator

4.5 Swept Oscillator

4.6

Observation of Modulation

Section 5 PRINCIPLES OF OPERATION

5.1 General Circuitry

5.2

Section 6 SERVICE AND MAINTENANCE

6.1

Warranty

6.2

Service

6.3 Minimum Performance Standards

6.4

Trouble Analysis Removal of Covers.

6.5

6.6 Installation of Oscillator Tube

6.7 Frequency Calibration

6.8

Lubrication.

6.9 Adjustment for Maximum Tube Life

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13 13 13 15 16

18 19 19

19

INTRODUCTION

1.1

PURPOSE.

The 1362 UHF Oscillator (Figure 1-1) eral-purpose oscillator for the radio-frequency laboratory. Covering the calibrated range from 220 to 920

MHz,

this oscillator provides adequate power to drive bridges, slotted lines, impedance comparators, and other measuring equipment. The output is brought through an attenuator, calibrated in relative power levels, making the oscillator suitable for the testing of receivers. Direct sine-wave, square-wave, or pulse

is

amplitude modulation tion free from incidental fm can be obtained with an external diode modulator. Connected to a mixer, the oscillator can be used as erodyne receiver to convert the GR 1236 I-F Amplifier, or a low-frequency communications receiver, into a detector for plitude modulation can be obtained with the GR Type 1264 Modulating Power Supply (Figure 1-2), or leveled

uhf signals. Square-wave and pulse am-

possible. Amplitude modula-

thelocal oscillator in a het-

is

a gen-

output can be obtained with the GR

tude-Regulating Power Supply.

1.2

DESCRIPTION.

1.2.1 GENERAL. The 1362 Oscillator uses a planar triode and

tuned by a butterfly resonator, to provide wide tuning

range without switching or sliding contacts. For details

refer to paragraph 5.2.

The butterfly rotor

backlash gears by the main dial, turning vernier drive, whose

100 arbitrary (logging) divisions. Frequency calibra-

is

tion with the logging scale

special-purpose power supplies, and the measurement

of plate current.

accurate to +I%. Resolution of 0.1% or better

Jacks are provided for modulation, connection of

is

9

turns are each resolved into

is

described in paragraph 3.2.

ppe 1263 Ampli-

is

driven 85' through anti-

330°, and the

INTRODUCTION

1

Figure 1-2. The Type 1362 assembled with the Type 0481-P416 Adaptor Plate Set for rack mounting.

UHF

Oscillator and the Type 1264 Modulating Power Supply

1.2.2 OUTPUT SYSTEM. The output system

with a coupling loop on one end and a locking

is

an adjustable coaxial line

GR874

coaxial connector on the other. Coupling between the

loop and the oscillator can be adjusted over a wide, continuous range, and the loop can be clamped in the desired position. With close coupling, maximum power can be delivered to load impedances normally encoun-

tered in coaxial systems. Power available into a

ohm load

is

plotted against frequency in Figure 1-3

50-

for a typical 1362 Oscillator. With loose coupling, the

movable line becomes a piston attenuator, calibrated over a range of 80

dB

(refer to paragraph 3.3).

1.2.3 FREQUENCY STABILITY. For most applications a well-regulated and fil-

tered power supply should be used to avoid amplitude and frequency variations caused by line-voltage fluctuation and to produce a clear audible tone when the output beats with a stable reference. With an

ulated

power supply, a line-voltage variation of 10

unreg-

percent causes an immediate (1 second) frequency change of about 0.002 percent at frequencies up to 500 MHz, and a change of about 0.02 percent at 900 MHz.

If the line voltage is held steady for 5 minutes after the

is

shift of 10 percent, the frequency change

about 0.02% up to 500 MHz and 0.04% at 900 MHz. Of the power supplies listed in paragraph 1.5, only the

Type 1269 is unregulated. The Type 1267, for example, reduces the effect of line-voltage change by a factor of 100 or more.

When the oscillator is turned on for use, a warmup frequency drift (0.2% typical total) will occur until the circuit stabilizes at the set frequency. Figure 1-4 shows typical

warmup frequency drift curves.

Individual instruments may drift considerably more or less, or even in the opposite sense from the typical.

1.2.4 POWER REQUIREMENTS.

The 1362 UHF Oscillator requires an external

power supply. The choice among the four General Radio power supplies recommended

in

paragraph 1.5 should be based on the intended application of the oscillator.

ommended 300 to 330 volts, dc, at 35

If

a power supply other than one of those rec-

is

used, it should be capable of delivering

mA for the plate, and 6.3

volts at 0.24 ampere for the heater. The negative side

of the power supply must be floating, since the positive side is grounded inside the oscillator.

400

',

300

(C

W

a

,

200

=I

a

I-

3

0

100

0

200 300 400 500 600 700 800

2

TYPE

1362

UHF

OSCILLATOR

FREQUENCY,

MHz

900 1000

1362.1

Figure 1-3. Output power into a 50-ohm load for a typical Type 1362 oscillator.

1.2.5 ACCESSORIES SUPPLIED. Incidental frequency modulation Supplied with the oscillator are a three-foot

coaxial double-shielded Tvpe 874 -R22LA Patch Cord, and a phone plug

(P/N 4220-2000, Figure 1-1).

(peak deviation) with

of 500

MHz,

and

25%- a-m at a carrier frequency

increases

with

frequency.

is

about 60 kHz

0.2

1

I

1362.13

Figure 1-4. Typical warmup frequency-drift characteristics far the Type 1362 UHF Oscillator with a Type 1267-A Regulated Power Supply.

1.3

AMPLITUDE MODULATION.

I

5

MINUTES

I

15

30

1

2

HOURS

3

1.3.1 GENERAL Amplitude modulation of the signal source (in a

test setup having a demodulator followed by a tuned amplifier) permits increased sensitivity of measurement compared to cw operation. Recommended liary equipment is described in paragraph

auxil-

1.5.

1.3.2 SINUSOIDAL AMPLITUDE MODULATION. A jack on the front panel of the oscillator permits

plate modulation by connection of an audio oscillator,

such as the Type 1311. This function is also supplied at another jack on the left-hand side plate. The modulator must supply a dc path

andmust be able to carry 30 milliamperes dc. A sine wave of 20-volts, rms, amplitude, will produce approximately

30% amplitude

modulation.

1.3.3 SQUARE -WAVE AMPLITUDE MODULATION. Modulation at full-rated output power is obtained

with the

Type 1264 Modulating Power Supply. When operatedwith a Type 1263 Amplitude-Regulating Power Supply, the oscillator provides a levelled rf output of 20 milliwatts, peak, into a 50 ohm load, with 1-kHz square-wave modulation (or cw).

1.3.4 PULSE AMPLITUDE MODULATION.

The rise time, starting delay, and jitter of the

1362 Oscillator depend on the frequency and load con-

ditions. Typical values obtained with a Type 1217 Unit Pulse Generator used to drive the Type 1264 Modulating Power Supply are shown in Figure 1-5.

4,

1.4

SWEEP OPERATION.

The 1362 Oscillator is well suited for swept

operation due to the use of ball bearings in the tuning

drive mechanism and to the absence of sliding contacts in the rf circuit.

Asweep drive can be coupledeither to the slowmotion dial or to the main frequency dial of the oscillator. When the main frequency dial is driven directly, the sweep rate should be restricted to one excursion per second or less. The slow-motion dial can be driven at rates up to 5 cycles per second. The

1263 Amplitude-Regulating Power Supply will maintain

a constant rf output amplitude as the oscillator

When the oscillator is driven by a sweep or dial drive, all moving parts in the oscillator must be lubricated in accordancewith paragraph 6.8. For recommended dial drives, refer to paragraph 1.5.

1.5

AUXILIARY EQUIPMENT.

The 1362 Oscillator can be used in conjunction with a variety of auxiliary General Radio equipment

is

Type

swept.

I

200

300

400

500

FREQUENCY. MHz

600

700

800

900

1362.2

Figure 1-5. Typical rise time, starting delay, and iitter when the oscillator is pulsed Type 1264 Modulating Power Supply, driven by

the

Type 1217 Unit Pulse Generator.

by

the

INTRODUCTION

3

tobuilda signal-source system that is suitedto speci-

should be based fic requirements. Typical systems are shown in Fig- lator. ure 1-6.

1-1

Table

for use with the 1362 Oscillator. The

lists the accessories recommended

choice of a rec-

ommended power supply, modulator, or sweep drive

MODULATOR OUTPUT VOLTMETER

FOR ULTIMATE

IN

STABILITY

POWER SUPPLY

\

plies can be readily attached to the oscillator to form

a single unit for bench use or for relay-rackmounting

with the listed adaptor plates.

onthe intendedapplicationof the oscil-

The Type 1263, 1264, 1267 and 1269 power sup-

ATTENUATOR

OUTPUT VOLTAGE

ADJUSTMENT

TYPE 874-VRL

-

Figure

-

SINUSOIDAL 400HZ OR lDDD

FOR

131 1

1M

WITH

HlGH LEVEL OUTPUT

TVPE 874-VRL

VOLTMETER

RECTIFIER

TYPE 874-MRL OR MRAL

I

L"T

TVPE

1236

1-6.

w

Typical signal-source systems built with a Type

8

0 2 TO 2.0 VOLT5 BEHIND 508

<

SIGNAL INPUT (190-950

IUDI~

HI

1362

1-1

FOR

MAXIMUM

OUTPUT

AND

MlNlMUM COST

FOR

iOOX SOUARE-

MIIYlMUM POWER OSCILLATOR OUTPUT, INTERNAL I-I".

IMPLITUDE

FOR REGULATED CW OR

FOR

HETEROOINE MIXER RECTIFIER DETECTOR USE rlOlW 1-6 AYPLlFEil OSCILLATOR

ACCESSORIES

Function GR Instrument* Remarks

POWER SUPPLIES For best stability, freedom from Type 1267 Power Supply

line-voltage variations, and minimum residual fm.

For full-power square -wave, Type 1264 Modulating pulsed a-m, or cw operation. Power Supply

814- GAL

TYPE AOJUSTIISLE TERMlNDiTlON ATTENUITOR TYPE 874 -020LOR

-

I

MHz

FOR FUNDAMENTAL MIXING1

UHF

Oscillator and associated equipment.

Regulated dc plate and heater supplies.

Internal or external pulser

1

-kHz

square-wave generator

(20

Hz to

TYPE

874-

WSO BL

TYPE

874-

TUNING STUB

RF OUTPUT

50

kHz).

OR

D50L

For amplitude-regulated cw or

1

-kHz square-wave modulated

Type 1263 Amplitude-

Regulating Power Supply Requires Type 874-VRL Voltmeter

Leveled output of 20

output. Rectifier.

ADAPTOR PLATE SETS To rack-mount the oscillator Type 480-P408 Adaptor

alone. Plate Set

To rack-mount the oscillator

Type 481

-P412 Adaptor with a Type 1267 or 1269 Plate Set Power supply.

To rack-mount the oscillator with a Type 1263 or 1264

481

Type Plate Set

-P416 Adaptor

Power Supply.

4

TYPE

1362

UHF

OSCILLATOR

mW into 50 ohms.

r-&L3

OSCILLATOR

fUII

I-ELqI

mi

L

tkzLIF*T

2.1

CONNECTION TO POWER SUPPLY.

1362

UHF

Oscillator dimensions (inches).

INSTALLATION

The 1362 Oscillator

tube installed and

is

to a suitable power supply.

is

shipped complete with

ready for use when connected

A

cord and connector are

supplied with the instrument for direct connection to

a General Radio power supply. Refer to paragraph

1.5 for recommendations. To connect the oscillator to the power supply,

plug the oscillator power cable into the receptacle on the side of the power supply. The dummy socket

chained to the left-hand side of the cabinet must be connected to the associated plug, except for use with the Type 1264 Modulating Power Supply, when the socket on the power-supply cable replaces the dummy.

When the Type 1263 Amplitude-Regulating

is

used, the small cable supplied with it should be

Power Supply

plugged into the telephone jack on the left-hand side

of the oscillator and into the power supply (refer to

the power-supply instruction book).

2.2

BENCH MOUNTING.

To bench mount the 1362 Oscillator with a Type

1264, 1267, or 1269 Power Supply, proceed with step

a; however, if the proceed with step

Type 1263 Power Supply is used,

j.

The procedure

is

as follows:

a. Remove the exterior cover from both the

oscillator and power supply by turning the captive thumbscrews at the rear counterclockwise and sliding the cover toward the rear.

POWER SUPPLY

OSCILLATOR

Figure

2-1.

Preparation for bench mounting hardware.

b. Release the two end-frame attaching screws

@)

at the left-hand edge (as seen from the front) of

the oscillator and the power supply (Figure 2-1).

c. Withdraw the screws and remove the spacers

(E)

between the panels and the end frames.

INSTALLATION

5

d. Slide end frame Y toward the rear and off

the oscillator.

Z

e. Slide end frame

toward the rear and off

the power supply.

f. Slide end frame

Z

was removed.

g. Slide end frame

Y

was removed.

Y

into place where end frame

Z

into place where endframe

h. Replace and tighten screws D and spacers E

at the left-hand edge of the power supply.

POWER

SUPPLY

Figure 2-2. lnstallation of clip in place of washers.

i.

Replace the exterior oscillator and power

supply covers.

j.

Remove both rubber feet (A) at the right-

hand side of the power supply and the left-hand side

of the oscillator so that the feet won't interfere witb one another (see Figure 2-1). Retain screws

(B).

NOTE

The legs on the front feet of the Type 1263 Power Supply and the oscillator thread into the feet.

Figure 2-3. lnstallation of oscillator with Type 1267 or 1269 Power Supply.

(D)

n. Reinstall the panel screws

through the

clips, into the end frames.

o. Place the power supply on its left-hand side

close to the oscillator.

p.

Attach the 5-pin plug from the oscillator to

the POWER jack on the supply. Figures 2-3 to 2-5 show the

oscillator/power supply combination as finally

assembled.

Figure 2-4. lnstallation of oscillator with

Type 1264 Power Supply.

With the Type 1264 Power Supply, remove the dummy socket from left-hand side of the oscillator.

tk. plug on the

Plugthe eightterminal connector of the attached modulation patch cord on the power supply to the connector on the oscillator (Figure 2-4).

With the Type 1263 Power Supply, connect the 2-pin plug of the Type 1263-B-40 Patch Cord (supplied) to the MODULATION plug on the right -hand side panel of the power supply (Figure 2-5). Connect the other end

of this cable to the MOD jack on the left-hand

side panel of the oscillator, as shown. Plug the

shorter side of the strajght-through section of the Type 874-VRL Voltmeter Rectifier into the

rf

output of the oscillator (Figure 2-6). The longer side of the straight-through section

(Ma.rked "R") connects to the load. Install the Type 874-ELLdirectly at the OUTPUT RECTIFIER

(GR874) connector of the power supply, with the free end facing to the rear. Connect the dc output (center arm) of

the Type 874-VRLVoltmeter Rectifier to the

ell, using the Type

(The Types 874-VRL,

874-R22LA Patch Cord.

-R22LA, and -ELL are

furnished with the power supply.)

k. Release the two end-frame attaching screws

@)

at the right-hand edge of the power supply. (For Type 1263 installation, apply this step to the left-hand edge of the oscillator.)

1. Withdrawthe screws and remove the spacers

(E) between the panel and the end frame.

m. Install one clip (F) in place of each spacer on the power supply, with the plain surface of the clip against the inner surface of the end frame. Align one hole in each clip with the appropriate panel hole (Figure 2-2).

6

TYPE

1362

UHF

OSCILLATOR

Figure 2-5. lnstallation of oscillator with

Type 1263 Power Supply.