System block diagram - Ok1mjo.com
System block diagram - Ok1mjo.com
System block diagram - Ok1mjo.com
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Frequency references (I)<br />
Need precise and stable frequency reference!<br />
• Precision:<br />
Is your reading on the VFO is the actual RX frequency?<br />
à required for finding a signal<br />
~ 100 Hz at 8.4 GHz is fine: 10 -8<br />
• Stability:<br />
Is your RX frequency the same for the next 60 seconds?<br />
à required for long integration times (60 – 1000 seconds)<br />
~ 1 Hz at 8.4 GHz = 10 -10 @ tau = 1000 sec<br />
Amsat-UK Colloquium 2006 Achim Vollhardt, DH2VA/HB9DUN 22
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