QRP Labs Si5351A Operating Manual Download Page 12

Page: 12 / 13

4. Resources

Please see the kit page

http://www.qrp-labs.com/vfo

for information on latest updates and issues.

Please join the Yahoo group

http://groups.yahoo.com/group/qrplabs/

for new kit announcements, to

discuss any problems with the kit, enhancements you’ve made, or just to tell everyone how much fun
you’re having.

5. Version History

19-Jan-2016



Initial version, for firmware version s1.00

04-Apr-2016



Firmware version s1.01

– only change is to remove the 10MHz limit on IF offset



Clarification of operation without GPS, in the GPS settings description, top of page 7

11-Nov-2016



Firmware version s1.02



Add negative IF offset capability



Added a long list of new #-tags to display data from the GPS module, when the serial data line

is connected.



Added multiple scrolling customisable display feature, with configurable pause on each item

(Line 1 Pause, Line 2 Pause etc. parameters)



If the #RF tag is in the display (reference frequency) and GPS discipline is used, it is updated

every 1 second with the new value



Add the #HB tag to display the heartbeat in the display, which beats in time with the GPS 1pps



Changed “Cont. correction” parameter to “Corr. threshold”, it now allows recalculates the VFO
when the reference frequency has changed by the specified amount. Continuous correction
can be achieved by setting 0.



Improvement to the GPS discipline at power-

up. The calibration starts off in “fine” mode, only

moving to “coarse mode” if necessary after 10 seconds. This avoids a large frequency jump at
power up.



Extended display support to 2- or 4-rows, and 16, 20, 24 or 40 columns (defined via new

configuration parameters “LCD Rows” and “LCD Cols”)

Summary of Contents for Si5351A

Page 1: ...figured to show not just VFO frequency but also your callsign or other text and if you have a GPS connected for disciplining the oscillator you may display GPS parameters such as date time latitude longitude altitude satellite reception status and Maidenhead locator 2 Operating instructions When you have just built the kit and have not yet configured it upon power up the kit will enter Diagnostic ...

Page 2: ...al purity of the output is degraded furthermore the minimum tuning step becomes wider than the 1Hz resolution of the tuning control Control functions Rotary Encoder Tunes the frequency in steps indicated by the underlined digit Left button Enter Select preset mode Right button A brief press enters the Configuration menu editing mode Right button hold Press and hold to enter Select tuning rate mode...

Page 3: ...he VFO Tuning mode 2 5 Configuration menu editing mode Preset 0 010 000 000 This is the mode for editing all the configuration parameters The configuration items are stored in the processors EEPROM memory and are preserved when the power is switched off Enter the menu editing mode from the VFO tuning mode by pressing the right button briefly Control functions Rotary Encoder Moves the display up an...

Page 4: ...es the cursor one character to the right and the rotary encoder cycles through the letters punctuation and digits However facilities are also provided to insert modify delete one character or the whole message The order of the letters punctuation and numbers is as follows The following characters symbols have special function Delimiter This character is used to delimit sub text inside the text ent...

Page 5: ...0 The Clk 1 parameter allows you to set up the Si5351A Synth on a frequency of your choice on its Clk1 output Clk1 may be set anywhere in the permissible frequency range of the Si5351A Here it is shown set to 9 002MHz for example If Clk 1 is set to 0 the default value then the Clk 1 output is switched off The Clk 1 output could be useful for example as the BFO in a receiver with the Clk 0 output a...

Page 6: ...sign will cause the output frequency to be 12MHz minus the displayed frequency which is exactly what is needed for a BITX40 VFO Multiplier 1 Multiplier allows you to use this signal generator as a VFO in radios where a Quadrature Sampling Detector for example is required that is clocked by a VFO signal at 4x the receive signal The Clk0 frequency is the displayed frequency offset multiplied by the ...

Page 7: ...1pps signal 2 The kit triggers on the rising positive edge of the 1pps signal This is appropriate for most GPS modules where the pulse width is 100ms for example Baud Rate setting default 9 600 baud This second setting on the GPS screen determines the baud rate for receiving serial data input from the GPS module It must be set to match the data output from the GPS module otherwise no data can be d...

Page 8: ... 003 968 Measured 27MHz reference oscillator frequency EE E Single character error flag Blank if there is no error E if there is an error ER ERR Three character error flag Blank if there is no error ERR if there is an error TR 100 kHz Current tuning rate occupies 7 characters 1Hz min to 10MHz max HH 10 UT hours 24 hour format from GPS data MM 43 UT minutes SS 58 UT seconds LH 01 Local time hours 2...

Page 9: ...ntially on each line Each line display is delimited by the delimiter character the inverted space character The display will then loop around all the displays configured displaying each in turn For example if you enter Line 2 as GV GG F GF T GT S GS Long LN Lat LT Alt AT then you have specified four separate displays each delimited by the character The bottom line will cycle through the four items...

Page 10: ...ncy b The menu system is entered and exited c The 27MHz reference frequency differs by more than this specified correction threshold from the value last used to update the VFO The default is 50Hz This parameter is useful because when the VFO is re calculated it can cause small glitches in the output frequency which can be audible on a receiver It can be annoying if that happens once every second d...

Page 11: ... brightness 0 corresponds to minimum brightness the backlight is switched off You should also note that the backlight brightness control is achieved by 8 bit pulse width modulation of the LED voltage The frequency is 610Hz and the duty cycle is varied Pulsing the 30mA LED could introduce noise onto the power supply so if you are also using a receiver you should check that interference is not cause...

Page 12: ...the serial data line is connected Added multiple scrolling customisable display feature with configurable pause on each item Line 1 Pause Line 2 Pause etc parameters If the RF tag is in the display reference frequency and GPS discipline is used it is updated every 1 second with the new value Add the HB tag to display the heartbeat in the display which beats in time with the GPS 1pps Changed Cont c...

Page 13: ...se unexpected behaviour Bug fix It was impossible to edit display configuration lines e g Line 1 parameter when they overflowed the 16 char display area 4 11 Nov 2016 Added example and further detail on the use of the negative IF offset which had caused some confusion ...

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