Major upgrade for my little Radio-telescope (Wanni)

Major upgrade for my little Radio-telescope

Revision title: modified L-Band feed installed

After some years of the original Radio Telescope configuration I installed a major upgrade:

I found a commercial off the shelf active L- Band patch Antenna and modified it for
lower frequency reception i.e. the Hydrogen-Line frequency at 1.42 GHz

I used my Tektronix 2712 Spectrum Analyzer to study the bandpass characteristics
and found a way to widen the L-Band Antenna passband by bypassing the saw-filter
- Some delicate soldering work required !

The active Patch Antenna is now used as an active feed, located at the prime focus of the dish antenna

The receiption box contains the SDR dongle and a low noise amplifier incl. a filter for 1.42GHz
also an analog 5 V power supply ( not a switching power supply : because of noise)
The SDR signal is processed by my software (python script) executing on a raspberry pi micro- computer

I updated my software for better quality of the waterfall image incl. signal intensity color rendering
See original and monochrome image samples

here are some information of the older Antenna feed
and other general information about my Radio Telescope

https://www.astrobin.com/6oypz0/D/?nc=collection&nce=238

here a more detailed explanation of the so called "hydrogen line"

https://www.astrobin.com/298870/B/?nc=collection&nce=238

B

Title: L-Band Antenna

Description: commercial available low cost active L-Band Antenna 1.525 GHz to 1.660 GHz

Uploaded: ...

D

Title: bypassing the Saw Filter

Description: This modification enables the Hydrogen- Line Frequency 1.42 Ghz

Uploaded: ...

E

Title: modified L-Band feed installed

Description: I added a Alu-sheet cover blocking direct sunlight

Uploaded: ...

F

Title: typical previous monochrome single scan

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G

Description: Reception box and Raspberry Pi

Uploaded: ...

H

Title: Spectrum Analyzer snapshot

Description: new passband analyzed after modification
at the tracking Spectrum Analyzer for three
different stored frequencies which have been overlayed

the very left peak is at 1420 MHz , the far right peak is the SA Band end
The two Peaks in the middle mark original Band pass of the active path antenna
One can also see the remaining elevated ground noise floor of the modified Bandpass

Uploaded: ...

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