Irwell HF Transceiver VFO Oscillator Module Re-Visited Pt2

For part 1 of revisiting the Digital VFO Oscillator  module click here.

 

In the last blog post I looked at replacing the three 25MHz xtals that are used for  reference clocks on the Si5351 IC's located on the the oscillator module of my digital VFO. 

The mod/upgrade to a single TCXO (temperature controlled xtal oscillator) module was carried out and tested in a lashup fashion with great success. In this blog post I report on the fabrication of a new PCB that is TCXO ready!

A new revision 2.0 PCB was created paying particular attention to the location of the TCXO module and the tracks leading to each of the Si5351 parts. The footprint of the six buffer amplifiers had to be reduced a little and I also used the opportunity to tidy up other areas of the PCB.

The image below shows a back view of the new PCB and I have circled the TCXO module for clarity:

Actual PCB Size is 110mm by 75mm

Next up is an image showing the top side of the new PCB:

Actual PCB Size is 110mm by 75mm

Here is the new oscillator PCB sandwiched between the display/MCU board and the I/O board.

 

All of the VFO PCB's stacked together & viewed from the underside. The four push buttons will be fitted with extender shafts once I get to housing the project.

 

 

Finally a front view image of the VFO

A new schematic has been produced to reflect the changes to the oscillator module and is shown below.

Click to enlarge to full size!

Since carrying out the TCXO upgrade to the VFO oscillator module no issues have been detected and everything is working nicely.

I do not anticipate any further changes to the VFO hardware though software changes and upgrades are in the works!

Project files are available via the Groups.io platform by joining my G6LBQ community group where you can discuss my projects, ask questions and help others.

Joining my group is free just click on the button below.

 

Until next time... 

  

73's From Andy G6LBQ

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