GUNN SOURCE

TEST BENCH KIT MODEL WT 2020 S

KIT CONSISTS OF FOLLOWING COMPONENTS

1. Gunn power supply digital display 1
2. VSWR meter 1
1. Gunn Oscillator 1
2. Pin Modulator 1
3. Isolator 1
4. Slotted line 1
5. Directional coupler 1
6. Magic tee 1
7. S S tuner 1
8. EH tuner 1
9. Tunable probe 1
10. Detector mount 1
11. Variable attenuator 1
12. Horn Pyramidal 2 nos
13. Fixed attenuator 1
14. W/G stands 3 nos
15. Frequency meter 1
16. Reflector sliding termination 1
17. Movable short 1
18. Matched termination 2 nos
19. BNC Cables 3 nos
20. Hardware 1 set
21. Lab manual 1 set

KLYSTRON SOURCE

TEST BENCH KIT MODEL WT 2010 S

KIT CONSISTS OF FOLLOWING COMPONENTS

1. Klystron power supply 1 Nos.
2. VSWR meter 1 Nos.
3. Klystron tube 1 Nos.
4. Klystron mount 1 Nos.
5. Isolator 1 Nos.
6. Slotted line 1 Nos.
7. Tunable probe 1 Nos.
8. Detector mount 1 Nos.
9. Variable attenuator 1 Nos.
10. Directional coupler 1 Nos.
11. Magic tee 1 Nos.
12. SS tuner 1 Nos.
13. EH tuner 1 Nos.
14. Horn parabolic 1 Nos.
15. Reflector Plate 1 Nos.
16. Frequency meter direct reading 1 Nos.
17. Movable short 1 Nos.
18. Matched termination 1 Nos.
19. Waveguide stand 1 Nos.
20. BNC Cables 1 Nos.
21. Hardware 1 Nos.
22. Lab manual 1 Nos.

Operating Voltage	: Mains 230 VAC, 50 Hz
Beam Supply
Voltage	: 180-400V (±40V)
Current	: 50 mA
Regulation	: 0.5% for +/- 10% variation
	In Power Supply Ripple < 5 mV

Repeller Voltage Supply:
Voltage	: 05V TO – 220 (±10V)
Regulation	: 0.25%for +/-10% variation in power supply
Ripple < 5mv
Filament Supply	: 5VAC
Modulation Square	Wave/Saw Tooth
Freq	Amplitude
AM 50-2500 Hz	10-15V
FM 50-5000 Hz	10-15V
Display	: Digital 3 ½ digit for Beam Supply, Repeller Voltage, beam Current, Standby Switch for   Heater

Operating Voltage	: Mains 230 VAC, 50 Hz
Voltage Range	: 0 to 12 Volts Variable (+ 0-12)
Regulation	: 0.2% for +/- 10% Variation (mains)
Ripple	: 1 mV rms
Modulation Square
-Frequency	: 900-2500Hz
- Amplitude	: 10-15V Variable
Display	: DIGITAL (Separate for Voltage and Current)

KLYSTRON SOURCE:
It consists of a reflex klystron tube, tube mount in the form of wave-guide cavity & klystron power supply unit.
A small hole in the broad wall of the wave-guide is provided, through which output coupling pin of klystron tube enters into the wave-guide. This hole is exactly located in the center of broad wall because the electric vector of electromagnetic field is maximum at the center ONLY. Maximum
Power is obtained by proper tuning of short matching the impedance of wave-guide to the klystron tube.

Freq	S	C	J	X
Waveguide	WR 284	WR 229	WR 137	WR 90
Length( mm)	240 mm	190 mm	170 mm	130 mm
Travel	75 mm	60 mm	50 mm	35 mm
Power Output	25 ww	25 mwatts	25 mwatts	25 mwats

This is an economical source of microwave power.  Gunn Oscillator uses a Gunn diode that works on negatives resistance produced by application of DC bias.  This is free running Oscillator.  The frequency often drifts along with change in ambient temperature.  A plunger is used to change frequency of Oscillations various models are available with power 10mwatts to 500 mwatts.  Board band versions are also available where frequency can change over full wave-guide band.  waveTech also produces directly calibrated Gunn oscillators.

Specifications type while ordering: 1 free running, 2 caviely stabilized, 3 Broadband.

Band	J	X	Ku	K	Ka
Waveguide	WR 137	WR 90	WR 62	WR 42	WR28
Model No.	Go-137-X	Go-90-X	GO-62-X	GO-42-X	GO-28-X
Length (mm)	170 mm	130 mm	90 mm	80 mm	80 mm

Pin diode used as a switch in wave-guide cavity.  Modulation is applied to Pin diode to switch on and off the signals passing thru the wave-guide.  Pin Modulator is used to modulate Gunn oscillators.  A resistive vane and Taper transformer is used as matching elements.

Frequency Band	J	X	Ku	K	Ka
Waveguide	WR 137	WR 90	WR 62	WR 42	WR 28
Model No	. PM 137	PM 90	PM 62	M 42	PM 28
Length (mm)	100 mm	80 mm	80 mm	70 mm	70 mm

The three port circulator consists of a ferrite prism mounted inside a three port junction and is a D.C. magnetic field provided by a permanent magnet already on the top and bottom of junction.  The direction of arrow indicates the direction which the transmission will take without much loss of power.  These component works on theory of farraday’s rotation effect in microwave devices.
Circulator are two types T & Y.  The difference lies in type of junction whereas the ferrite material is placed with permanent magnet.  In T circulator junction is as T type.  In Y circulator, junction from 120 degree and it looks in T shape.  There are two terms associated with circulator.
(1) ISOLATION: its defined s ration of power in ‘db’ at input part to the isolated part.
(2) INSERTION LOSS: its defined as ration  of (db) power at output part to input part.

A three part circulator may be converted into isolator by terminating isolator part by a standard termination.

BAND	S	J	X	K u	Ka	K
WAVEGUIDE	WR248	WR137	WR 90	WR 62	WR 42	WR 28
MODEL No Isolation (db)	XX 284	XX 137	XX 90	XX 62	XX 42	XX 28
Insertion Loss	20 dB	20 dB	20 dB	20 dB	20 dB	0.6
(1GHz bandwidth	0.20.2	0.2	05	08

Slotted line consists of a wave guide with a longitudinal narrow slot 2mm on surface of broad wall as at this point, electric vector is maximum leakage of radiation is in very small quantity. The upper most part is know as carriage which can accommodate the tunable detector probe extends the simple and easy methods for finding out the voltage maxima and voltage minima.
After Knowledge of voltage maxima & minima following can be calculated.
(1) Load impendence (2) Standing wave ratio.
(3) Frequency of microwave source at any (4) Reflection co-efficient
Point for dominant made.
(5) Guided wave length
OPTIONAL:
For better accuracy WAVETECH provides dial caliper
To measure accurate siding distance in face shift measurement.

Basically probe is a co-axial line with square law detector. The cavity of probe can be tuned for matching its impedance with slotted line.
The inner conductor of wire penetrated in the wave guide and contact with a detector crystal. The power coupled through inner wire is detected by detector crystal and can measured by any measuring instruments.
In general probe Penetration should be minimum to avoid reflection and distortion in the .
BROADBAND PROBE.
This type of probe is fixed and has no unique part. This probe is suitable full band operation.
WAVETECH also provide a tunable probe in which micrometer fixed on the top of probe for precision work name as precision tunable probe

An attenuator is used to reduce power. A resistive vane is used to attenuate signals. The vane is placed in center of broad dimension. The attenuation depends upon depth of Penetration of vane inside of the wave guide.
VARRIABLE ATTENUATOR:
A sliding mechanism is provided to change attenuation. It’s fitted with a precision micrometer. The position of resistive plate can be adjusted up to the accuracy of 0.02 mm. The low V.S.W.R. Of attenuator is maintained by variable and precise range of resistive plate. The value of attenuation is dependant of frequency. These are calibrated at center of band. .

BAND	S	C	J	X u	Ku	K	Ka
WAVEGUIDE	WR 248	WR 229	WR137	WR 90	WR 62	WR 42	WR 28
Model No (db)	WT 284	WT 229	WT 137	WT 90	WT 42	WT 42	WT28
Attenuation	0.02db	0.02 dB	0.02 dB	0.02 dB	0.02 db	0.02 db	0.02 db
Range (db)	0-20	0-20	0-25	0-25	0-20	0-20	0-20