Adding a prescaler does not reduce the accuracy if you extend the sample
time.
You could have two sample times. FAST for quick look and SLOW for accuracy.
Bob Macklin
K5MYJ
Seattle, Wa.
"Real Radios Glow In The Dark"
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----- Original Message -----
From: "Bo, OZ2M" <groups.io@...>
To: <
[email protected]>
Sent: Tuesday, November 05, 2019 11:42 PM
Subject: Re: [qrptech] DDS VFO!
Hi
Some but not all Arduinos can count up to 6,4 MHz, i.e. 40% of clock
frequency. Empiric data shows a bit higher, ~43%. The Arduino Zero can count
up to 90 MHz e.g. as implemented in the RFzero:
I don't know about the
Arduino Due.
Here is a video of my presentation of "Arduino, GPS, RF and the Si5351A for
radio amateurs" at the RSGB 2019 Convention:
Adding a prescaler reduces accuracy.
A word of caution: a good spectral performance does not come from "trowing"
parts together. Many Si5351A spectral plots on the web show that clearly.
Prego
Bo
