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Experiment No 8: Aim: To Determine The Frequency & Wavelength in A Rectangular Waveguide Working in

This experiment aims to determine the frequency and wavelength of a rectangular waveguide operating in the TE10 mode. The apparatus includes a klystron power supply, klystron tube, isolator, frequency meter, variable attenuator, slotted section, tunable probe and waveguide stand. The procedure involves setting up the components, adjusting the power supply settings, and using the tunable probe and slotted section to measure the distance between minima and calculate the guide wavelength. This is then used along with the waveguide dimensions to determine the frequency based on the relationships for the TE10 mode in a rectangular waveguide.

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Sanab Kumar
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169 views5 pages

Experiment No 8: Aim: To Determine The Frequency & Wavelength in A Rectangular Waveguide Working in

This experiment aims to determine the frequency and wavelength of a rectangular waveguide operating in the TE10 mode. The apparatus includes a klystron power supply, klystron tube, isolator, frequency meter, variable attenuator, slotted section, tunable probe and waveguide stand. The procedure involves setting up the components, adjusting the power supply settings, and using the tunable probe and slotted section to measure the distance between minima and calculate the guide wavelength. This is then used along with the waveguide dimensions to determine the frequency based on the relationships for the TE10 mode in a rectangular waveguide.

Uploaded by

Sanab Kumar
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Experiment No 8

NAME: : Khan Barkat ROLLNO:BA071


EXPERIMENT NO 8
Aim: To determine the frequency & wavelength in a rectangular waveguide working in
TE10 mode.
Apparatus required :
1 Klystron power supply
2 Klystron tube
3 Isolator
4 Frequency meter
5 Variable attenuator
6 Slotted section
7 Tunable probe
8 Wave guide stand
9 SWR meter
10 Matched termination.
Theory :
Mode represents in wave guides as either TE m, n/ TM m,n
Where
TE – Transverse electric, TM – Transverse magnetic
m – Number of half wave length variation in broader
direction. n – Number of half wave length variation in shorter
direction.

where d1 and d2 are the distance between two successive minima/maxima It

is having highest cut off frequency hence dominant mode. For dominant (

TE10) mode in rectangular wave guide λ0, λg and λc are related as below.

Radiation and Microwave Techniques, Dept. E&TC, SKNSITS


Experiment No 8

Where λ0 is the free space wavelength, λg is the guide wavelength and λ is the cut off
wavelength.
For TE10 mode,

Where m = 1 in TE10 mode and ‘a' is broad dimension of waveguide. The following

relationship can be proved

8
Where c = 3 x 10 m/s is velocity of light and f is frequency.
Procedure :
1. Set up the components and equipments as shown in figure.8.1
2. Set the variable attenuator at maximum position (at no attenuation).
3. Keep the control knobs of SWR Meter as below:
Range dB : 50 dB position
crystal : At 200ohm Impedance
Mode select : Normal Position Gain
(Coarse & Fine) : Mid Position
SWR/dB : dB position
4. Keep the Control knobs of Klystron power supply as below.
Mod- Switch : AM
Beam Voltage Knob : Fully anticlockwise
Reflector Voltage : Fully clockwise
AM-Amplitude Knob : Fully clockwise
AM-Frequency : Mid Position

Radiation and Microwave Techniques, Dept. E&TC, SKNSITS


Experiment No 8

Fig.8.1 Setup for study of frequency & wave length measurement


5. Switch on the klystron power supply, SWR meter and cooling fan.
6. Turn the meter switch of power supply to beam voltage position and set beam
voltage at 300V with the help of beam voltage knob, current around 15 to 20
mA.
7. Adjust the reflector voltage to get some reading in SWR Meter.
8. Maximize the reading with AM amplitude and frequency control knob of
power supply.
9. Tune the plunger of klystron mount for maximum reading.
10. Tune the reflector voltage knob for maximum reading on SWR meter.
11. Tune the probe for maximum reading in SWR meter.
12. Tune the frequency meter to get a 'dip' on SWR meter and note down the
frequency directly from frequency meter and detune the DRF
13. Move the tunable probe along with the slotted line to get the reading in SWR
meter. Move the tunable probe to a minimum reading position. To get
accurate reading, it is necessary to increase the SWR meter range dB switch
to higher position, record the probe position i.e. d1
14. Move the probe to next minimum position and record the probe position
again i.e. d2.
15. Calculate the guide wavelength as twice the distance between two successive
minimum positions obtained as above.

λg = 2(d1-d2)
16. Measure the wave-guide inner broad dimension 'a' which will be around
22.86 mm for X band and Calculate

Radiation and Microwave Techniques, Dept. E&TC, SKNSITS


Experiment No 8

Radiation and Microwave Techniques, Dept. E&TC, SKNCOE, Pune.


Radiation and Microwave Techniques, Dept. E&TC, SK

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