Re: QCX-SSB: SSB with your QCX transceiver

Jerry Gaffke

The 400khz spec is part of the i2c standard.
Easy to imagine that chips can go much faster.
Especially with a short bus and no other loads.

Updating the frequency on an si5351 requires a bunch of register writes.
A DDS chip would require fewer writes and provides much more flexibility.
But the cheapest DDS chips are 10x the price of the $1 si5351.

ARM processors can be cheap and powerful.
But you work with what you got.

And if you got a QCX to do this, that's totally amazing!


On Mon, Jan 28, 2019 at 02:32 PM, Jerry Gaffke wrote:

Running an 800khz i2c bus into the si5351 is over spec by a factor of two, 
Maybe one of the DDS chips would be more appropriate here.

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