All three Si5351 outputs are routed from the Si5351 to the Raduino's P3 connector through 0.1uF DC blocking caps. ?You need those DC blocking caps. ?Perhaps you are using a different Si5351 breakout board? ?I believe the Bitx40 currently uses CLK2 for the VFO, leaving CLK0 and CLK1 available. ?I suggest you use CLK0 for the BFO. ?I've seen reports that there is more crosstalk between channels when using CLK1. ?
You should be able to find skinnier and more flexible coax out there than RG-174 if that's an issue. ?The impedance (50 or 75 ohms) should not matter much at these frequencies for these frequencies (below 50 mhz) on coax pieces of just a foot or so in length. ?It's possible that the volume control and microphone input could benefit from coax also.
On Sat, Apr 8, 2017 at 12:35 pm, Jonathan Peakall wrote:
Getting ready to convert over to using the si5351 for the BFO. I'd like to use rg-174 for both the VFO and BFO lines. The Si5351 has three outputs. The first is already routed on the PCB to the SIP header making it inconvienent to solder coax to it. Is there any reason that I can't use the two other Si5351 outputs that aren't used? That would be easy to solder to.
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