Set minimum frequency of PLL 200MHZ instead of 600MHZ. Minimum frequency possible is now 200/4095=49khz

src/gpio.cpp

@@ -205,7 +205,8 @@ int clkgpio::ComputeBestLO(uint64_t Frequency, int Bandwidth)
 	//
 	// There may be improvements possible to this algorithm.
 	// Constants taken https://github.com/raspberrypi/linux/blob/ffd7bf4085b09447e5db96edd74e524f118ca3fe/drivers/clk/bcm/clk-bcm2835.c#L1763
-	#define MIN_PLL_RATE 400e6
+	//MIN RATE is NORMALLY 600MHZ
+	#define MIN_PLL_RATE 200e6
 	#define MIN_PLL_RATE_USE_PDIV 1700e6
 	#define MAX_PLL_RATE 4e9
 	#define XTAL_RATE 19.2e6