Dual band 2/0.7 meters SDR tranceiver.
Am looking for electric diagram of an 145 to 437 mhz SDR transceiver.
Thanks in advance.
Juan Carlos, CO8TW.
Please can you supply all information & the model of the SDR tranceiver you require, I have many circuit diagrams in my filing cabinet that I can send to yourself, my private E-mail is on my page for you to reply. Best Regards, Dave.
I have not seen any SDR transceivers that operate at VHF/UHF yet.
One reason is that the Analog to Digital Converter (ADC) technology for direct conversion is really not yet fast enough to handle those frequencies (remember Nyquist sampling theorem N (or frequency) x 2) as minimum. It is easier to use a transverter to convert the signal down to HF and use existing SDR radios.
"RF gotta go somewhere!"