This is my finished product after building a Mini-Kits EME117ver3 137MHz Weather Satellite Receiver. I enclosed the receiver board into a case purchased from Jaycar and added accessories such as power, Speaker volume, RX LED, Vernier precision potentiometer with analog dial for tuning and a backlit signal meter. An internal speaker is added so you can listen to the signal, but a secondary mono output connects from the back of the receiver to the soundcard the computer for reception and is set internally. RF comes in via a standard RF connector from the back with 50 Ohm impedance and the entire receiver runs from a 12V DC supply. A 500mA fuse has been added in the back panel for protection. I originally constructed a six position rotary channel switch which used six individual tuning pots for each frequency. Due to drift and the inability to tune to Doppler shift changes, I opted for the vernier dial control. The vernier dial is much simpler and only has three wires connected to the main receiver board and in circuit looks just like a single three pin pot. Overall the project is very good and a lot of fun to build. I currently am using only my amateur 2m/70cm Omni-directional antenna. It works but not so great once the satellites are overhead do to the flat angle of radiation my vertical antenna has. I plan to build a more specialised antenna soon called a Quadrifilar Helix Antenna that works very well for NOAA APT Reception and will make a big difference to the reception ...
Wednesday, October 31, 2012
Home Constructed NOAA VHF Weather Satellite Receiver.
Home Constructed NOAA VHF Weather Satellite Receiver. Video Clips. Duration : 10.02 Mins.
This is my finished product after building a Mini-Kits EME117ver3 137MHz Weather Satellite Receiver. I enclosed the receiver board into a case purchased from Jaycar and added accessories such as power, Speaker volume, RX LED, Vernier precision potentiometer with analog dial for tuning and a backlit signal meter. An internal speaker is added so you can listen to the signal, but a secondary mono output connects from the back of the receiver to the soundcard the computer for reception and is set internally. RF comes in via a standard RF connector from the back with 50 Ohm impedance and the entire receiver runs from a 12V DC supply. A 500mA fuse has been added in the back panel for protection. I originally constructed a six position rotary channel switch which used six individual tuning pots for each frequency. Due to drift and the inability to tune to Doppler shift changes, I opted for the vernier dial control. The vernier dial is much simpler and only has three wires connected to the main receiver board and in circuit looks just like a single three pin pot. Overall the project is very good and a lot of fun to build. I currently am using only my amateur 2m/70cm Omni-directional antenna. It works but not so great once the satellites are overhead do to the flat angle of radiation my vertical antenna has. I plan to build a more specialised antenna soon called a Quadrifilar Helix Antenna that works very well for NOAA APT Reception and will make a big difference to the reception ...
This is my finished product after building a Mini-Kits EME117ver3 137MHz Weather Satellite Receiver. I enclosed the receiver board into a case purchased from Jaycar and added accessories such as power, Speaker volume, RX LED, Vernier precision potentiometer with analog dial for tuning and a backlit signal meter. An internal speaker is added so you can listen to the signal, but a secondary mono output connects from the back of the receiver to the soundcard the computer for reception and is set internally. RF comes in via a standard RF connector from the back with 50 Ohm impedance and the entire receiver runs from a 12V DC supply. A 500mA fuse has been added in the back panel for protection. I originally constructed a six position rotary channel switch which used six individual tuning pots for each frequency. Due to drift and the inability to tune to Doppler shift changes, I opted for the vernier dial control. The vernier dial is much simpler and only has three wires connected to the main receiver board and in circuit looks just like a single three pin pot. Overall the project is very good and a lot of fun to build. I currently am using only my amateur 2m/70cm Omni-directional antenna. It works but not so great once the satellites are overhead do to the flat angle of radiation my vertical antenna has. I plan to build a more specialised antenna soon called a Quadrifilar Helix Antenna that works very well for NOAA APT Reception and will make a big difference to the reception ...
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