On Fri, Mar 29, 2024 at 11:21 AM, Charudatt Uplap wrote:
I'm homebrewing the sBITX and building only the Exciter board at the present.?
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Although I have a provision for the ATTiny chip on board I don't plan to use it or bypass it.?
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For the Si5351, I wanted an easy way to calibrate or set the exact clock frequency.?
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regards
Charudatt - vu2upx
Hi.
I did some research on the requests and don't think the masses will find this useful as part of the Toolbox. The Toolbox is designed for a functional radio as icing on the cake.
Explanation 1. The TXCO clock frequency requires a change to si5351v2.c and then the system must be recompiled using ./build sbitx. You can simply adjust the clock frequency in the file and test with lab equipment.
Line 44-46 is where to make the changes.
#define PLLFREQ (xtal_freq_calibrated * PLL_N)
//int xtal_freq_calibrated = 25012725; // crystal oscillator?
int xtal_freq_calibrated = 25000000; // tcxo
Explanation 2. The ATTiny module can be stripped out of the code, but you will require changes to many files. it is best to do this on your own for a customized build.
Sorry - My efforts are focused on improvements to other enhancements and features at this time.
-JJ
