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The si5351 clock outputs are square waves. There is some discussion in the forums about the harmonic content of the waveform and the need for The answer is, it depends on what you are doing with the VFO signal. In the dual conversion multiband receiver I have in mind, all 3 mixers are SBL-1s.W8S Team will be active from Swains Island, IOTA OC - 200, 23 September - 6 October 2020. UDB1200, fully programmable DDS signal generator, dual TTL drive IGBT 2MHz 3MHZ 5MHZ 10MHZ. This is a full DDS signal source, the use of DC5V power supply can output sine, square wave (duty cycle can be 1% -99% adjustment), triangle wave, and sawtooth variety of functions such as waveform, maximum output of up to 9Vpp frequencies from 0.001Hz-2MHz (optional 3MHz, 5MHz and 10MHz) resolution 0 ...
UDB1200, fully programmable DDS signal generator, dual TTL drive IGBT 2MHz 3MHZ 5MHZ 10MHZ. This is a full DDS signal source, the use of DC5V power supply can output sine, square wave (duty cycle can be 1% -99% adjustment), triangle wave, and sawtooth variety of functions such as waveform, maximum output of up to 9Vpp frequencies from 0.001Hz-2MHz (optional 3MHz, 5MHz and 10MHz) resolution 0 ...
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The code auto-selects EXTCLK, by checking for a clock signal on the pin. I've also tested 48MHz-UB3 from Si5351, which needed small shuffles to delay the test until the Si5351 was updated. Select of the lowest (2mA) drive from the Si5351 looks to give nice soft 48MHz edges but still rail-rail & is also fine on the 20MHz to P2 W211 parking light bulb.
Apr 14, 2017 · Instead, I replaced the BFO entirely with a spare channel on the Si5351 frequency synthesizer. I started off by attaching wires to pins 8 and 9 of the Raduino board. These are Si5351 channel 0 and ground, respectively. For quick progress, I used a twisted pair. When I box it up, I will switch to coax and use a connector to make maintenance easier. W8S Team will be active from Swains Island, IOTA OC - 200, 23 September - 6 October 2020.