Alauda Projects

Controller for DR-1X repeater

By AP, 

            
I made this for a friend. Is a remote controller for Yaesu DR-1X repetear that is installed on Summit Heniu (145.725 Tx -6khz Rx). This is a mixed digital (C4FM) and analogue repeater that is covering almost all northern half of Transyvania and can also be accessed via Echolink YO5D-R, node 54452.


		
		


This version is using an audio USB dongle, but next iteration will be built with I2S:


Next version of DR-1X controller. Rendered in KiCad. Still did not decide if I will use a LDO or a buck converter. I2S block is on the right but, probably, using stereo and separate ADC and DAC is overkill. I am looking for a mono, simpler I2S CODEC and strongly considering ES8311.

                        
            

    


    




    
    

                        

                    

                        

                            
I2S interface for Raspberry Pi (1)
By AP,  
Today I managed to connect the Digilent Pmod I2S2 to a Raspberry Pi 4 and have all frequencies generated. This is part of an older project that I left abandoned for a while: a radio node built on Raspberry Pi and using Svxlink. As known, Raspberry boards do not have a proper audio interface and […]


                            

                                
                                                                    
                            

                        

                    

                

                        

                    

                        

                            
Harris 300W UHF Pallet
By AP,  
A couple of days ago I received from a friend of mine a Harris RF power pallet salvaged from a scrapped equipment. This pallet would be able to dissipate apx 300W PEP (black) on a 50 ohm load on ∼800 Mhz. Unfortunately I have no documentation for this. I do have the schematic but is […]


                            

                                
                                    Harris 300W UHF pallet — how good could this be as a QRO for 70cm amateur radio band ?                                
                            

                        

                    

                

            







			
		
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