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Telescopes
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Amplifiers donít work at very high frequencies, so must change to a lower frequency before amplifying

Want all of the electronics that change the signal to forms we can record and analyze to only have to be designed for one frequency (called baseband frequency).

If the signal must be transmitted a long distance, there will be less loss if the frequency is first shifted to a lower frequency

Slide 66

Receivers

Receivers

The design of the receiver is effected greatly by whether the radiation observed is radio, millimeter, or submillimeter.

Slide 67

Receivers

Receivers

The size of the electronics gets smaller as the wavelength gets shorter (higher frequencies)

So devices associated with radio telescope receivers

(long wavelength) are larger than the devices associated with millimeter and submillimeter receivers (shorter wavelengths).

Slide 68

Radio receivers

Radio receivers

Radio

100MHz - 100GHz

3m-3mm

Slide 69

Radio receivers

Radio receivers

Arecibo Observatory

receivers

Slide 70

Arecibo radio telescope

Arecibo radio telescope

Receivers are inside

the dome

Slide 71

Radio receivers

Radio receivers

receivers

Slide 72

Radio receivers

Radio receivers

Slide 73

Radio receivers

Radio receivers

VLBA telescope

receivers

Slide 74

Radio receivers

Radio receivers

VLBA telescope

Slide 75

Radio horns

Radio horns

VLBA telescope

~1 meter

Slide 76

Millimeter receivers

Millimeter receivers

Millimeter

100GHz-300GHz

3mm-1mm

Slide 77

Millimeter wave receiver

Millimeter wave receiver

Receivers

Hat Creek Radio Observatory

Slide 78

Millimeter wave receiver

Millimeter wave receiver

Slide 79

Millimeter wave receiver

Millimeter wave receiver

Horns

Amplifiers

~0.5 m

Slide 80

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