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Re: Pseudo-Sine?

 

I don't believe that will work as CLK02 is not used for CW transmit. CLK01 produces "ON FREQUENCY OF TRANSMISSION RF (square waves) for CW and that is where the harmonics need to be surpressed. There is no way to successfully convert CLK01 to even a pseudo sine wave over the complete 1.8-30 MHz frequency range for clean CW transmission. ??

Now, IF Silicon Labs were to produce a chip that was a pin-for-pin replacement for the Si5351a but output a sine wave instead, then I'd instantly swap out the 5351's on all my uBITX Raduino's and the TSW Raduino Clone and BITeensio cards. ?Until that happens the multiple LPF's with extra switching is about the only fix IMO.

Jim - W0EB



------ Original Message ------
From: "Jim Tibbits" <ab7vf1@...>
Sent: 3/4/2019 10:13:33 AM
Subject: Re: [BITX20] Pseudo-Sine?

Since someone asked about an RC filter ...Logical place would be on Clk02 (45-75 Mhz)? ...as an example random/scraped from google

Double the l's and spice it ...Not simple ..There is a reason RF design engineers get paid the big bux, right?

Jim

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