It turned out that there is a minimum divide ratio for this chip and the only way to use it is to have a much lower reference frequency than 25kHz. I decided that if I was going to modify this for 6m I would use my own synthesised local oscillator design and avoid using a fractional-N PLL.
However, there are moves afoot for VK Hams to gain access to 4m. I'll shelve this project for now since this transceiver would be readily suited to a 4m application. Time to go find another project!
73's
Richard VK6TT
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