Post
by VK3KYY » Mon Oct 26, 2020 8:48 am
The limits of the hardware are set to these values
{
.minFreq=127000000,
.maxFreq=178000000
},// VHF
{
.minFreq=190000000,
.maxFreq=282000000
},// 220Mhz
{
.minFreq=380000000,
.maxFreq=564000000
}// UHF
However the published spec of the RF IC in the radio is
{
.minFreq=134000000,
.maxFreq=174000000
},// VHF
{
.minFreq=200000000,
.maxFreq=260000000
},// 220Mhz
{
.minFreq=400000000,
.maxFreq=520000000
}// UHF
So we are pushing the radio beyond the limits of the RF chip from the data sheet
We tried to extend the range further, but the PLL in the RF chip will not lock reliably beyond the limits in the first list.