KO7M - Ham Radio Blog

Well, I have finally updated my Si570 code on GitHub to reflect the changes to fix a bug found and blogged about over two years ago.  I desc...

In a previous post I pondered briefly about BPSK (used in PSK31) as compared to FSK. Instead of traditional frequency-shift keying, in BPSK...

I have implemented changes to the Minima controller code developed by Eldon Brown (WA0UWH) and others to use the second Si570 on my contr...

Well, I am not certain yet how I am going to mount things in the long run, but for now I have stacked the display, Uno and Shield on the bac...

This evening, I hacked poor Wayne, NB6M's Minima to accept VFO energy from my Minima Controller shield.  As a first hack, it worked fine...

Last evening I placed my second Si570 on my Minima Controller shield and am pleased to see it is functional as well. The datasheet for t...

UPDATED: My Minima controller Arduino shield checks out as functional.  With two Si570 devices on the board, powering them from the Arduin...

I have completed (as far as I went) the build of my Minima Controller Shield, but have yet to complete testing of the board.  I populated on...

I had a little time this evening to start stuffing my prototype Minima controller board with parts.  Got the Si570, voltage regulator, reset...

I finished up the Si570 shield for the Arduino today and sent the gerber files off the the fab house today.  They will be on the panel to be...

I have spent some time today working on my Si570 Arduino shield.  A few changes: Added a 3.3V regulator on the board with a separate power...

A problem has been discovered in my Si570 code that implements 1Hz tuning.  The code was unnecessarily resetting the DCO on every update whe...

I have integrated my keyer code that was originally developed for the Propeller hardware and ported to the Arduino with the Minima firmware....

I have published my Si570 code that should be compatible with the Minima Arduino sketch on my github repository.  You can find it at https:/...

Here is my function for determining an appropriate set of divisors (HSDiv and N1) given the desired output frequency that keeps the Si570 DC...

So, if I have learned nothing else, it is that I am no mathematician and am really slow at figuring out this stuff.  Here is where I am at w...

While I certainly didn't intend to write a novel on the topic of Si570 programming, it is a topic that at least for me is unclear from d...

In thinking about alternative methods of calculating the necessary parameters for the Si570 frequency setting elements, other than double pr...

As previously mentioned, I held two possible interpretations of the datasheet regarding what is meant by how far the DCO frequency could be ...

The relationship between the various frequency setting elements is described as follows: As previously mentioned, the output frequency i...