Editing
Use the n or CR key to move to the next cell
Use the p key to move to the previous cell
Use backspace and the number keys to edit a cell
Editing may seem rather counter-intuitive because the cursor (arrow) keys do not function. The
reason for this is that the ProgRock2 microcontroller has limited Flash memory so a very slimline
editing tool was required, that does not take up too much code space.
The currently selected memory bank is indicated by the asterix next to the bank column – in the
above example, Bank 0 is selected.
Frequencies set to zero cause the corresponding Si5351A output to simply be switched off.
When editing is complete, press the ‘s’ key to save the configuration to non-volatile memory (Flash
memory).
Phase offset modes
CLK 1 may be configured to operate on the same frequency as CLK 0 but have a defined
(accurate) phase shift. This is useful for example, for directly driving quadrature sampling detector
type mixers. To enable this mode, set the CLK 1 frequency to one of 90, 180, 270 or 360.
•
90: CLK 1 is on the same frequency as CLK 0 with a 90-degree phase shift
•
180: CLK 1 is on the same frequency as CLK 0 with a 180-degree phase shift (CLK 1 is the
inverse of CLK 0 – useful for driving Push-Pull circuits such as amplifiers)
•
270: CLK 1 is on the same frequency as CLK 0 with a 270-degree phase shift – useful for
selecting the opposite sideband to the 90-degree setting
•
360: CLK 1 and CLK 0 are identical in phase and frequency
Limitations:
There are certain limitations on frequency in the various modes, as follows:
1. The lowest frequency attainable is a little under 3.5 kHz
2. The highest frequency is 228 MHz
3. If one output is more than 150 MHz, no other outputs may be configured
4. If GPS discipline is applied, CLK 2 is set to 9,999,999.5 Hz regardless of any configuration
settings
5. When using CLK 1 in 90-degree or 270-degree mode, the output frequency precision may
be slightly lower than normal
6. When using CLK 1 in 90-degree or 270-degree mode, the minimum frequency for CLK 0
and CLK 1 is a little under 3 MHz.
ProgRock2 manual 1.00b
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