diff --git a/firmware/common/rffc5071.c b/firmware/common/rffc5071.c
index c0e2cd80..6c2bb82c 100644
--- a/firmware/common/rffc5071.c
+++ b/firmware/common/rffc5071.c
@@ -24,6 +24,12 @@
  * program would do if it had a real spi library
  */
 
+/*
+ * The actual part on Jawbreaker is the RFFC5072, not the RFFC5071, but the
+ * RFFC5071 may be installed instead.  The only difference between the parts is
+ * that the RFFC5071 includes a second mixer.
+ */
+
 #include <stdint.h>
 #include <string.h>
 #include "rffc5071.h"
@@ -139,24 +145,10 @@ void rffc5071_setup(void)
 	 * not control pins. */
 	set_RFFC5071_SIPIN(1);
 
-	/* Initial settings for Lollipop switches, same for both
-	 * paths. These could use some #defines that iron out the
-	 * (non)inverted signals.
-	 *
-	 * bit0: SWTXB1 (!tx_bypass)
-	 * bit1: SWRXB1 (rx_bypass)
-	 * bit2: SWTXA1 (tx_hp)
-	 * bit3: unused (lock bit)
-	 * bit4: SWRXA1 (rx_hp)
-	 * bit5 SWD1 (!tx_ant)
-	 *
-	 * Unknown whether shift is needed. There are 7 register bits
-	 * to hold 6 GPO bits. */
-	set_RFFC5071_P1GPO(0b010100<<1);
-	set_RFFC5071_P2GPO(0b010100<<1);
-
-	/* send lock flag on GPO4 */
-	set_RFFC5071_LOCK(1);
+#ifdef JAWBREAKER
+	/* initial safe switch control settings */
+	rffc5071_set_gpo(SWITCHCTRL_SAFE);
+#endif
 
 	/* GPOs are active at all times */
 	set_RFFC5071_GATE(1);
@@ -256,6 +248,15 @@ uint16_t rffc5071_spi_read(uint8_t r) {
 	serial_delay();
 	gpio_set(PORT_MIXER_ENX, PIN_MIXER_ENX);
 
+	/*
+	 * The device requires a clock while ENX is high after a serial
+	 * transaction.  This is not clearly documented.
+	 */
+	gpio_set(PORT_MIXER_SCLK, PIN_MIXER_SCLK);
+
+	serial_delay();
+	gpio_clear(PORT_MIXER_SCLK, PIN_MIXER_SCLK);
+
 	return data;
 #endif /* DEBUG */
 }
@@ -316,8 +317,17 @@ void rffc5071_spi_write(uint8_t r, uint16_t v) {
 		gpio_clear(PORT_MIXER_SCLK, PIN_MIXER_SCLK);
 	}
 
-	serial_delay();
 	gpio_set(PORT_MIXER_ENX, PIN_MIXER_ENX);
+
+	/*
+	 * The device requires a clock while ENX is high after a serial
+	 * transaction.  This is not clearly documented.
+	 */
+	serial_delay();
+	gpio_set(PORT_MIXER_SCLK, PIN_MIXER_SCLK);
+
+	serial_delay();
+	gpio_clear(PORT_MIXER_SCLK, PIN_MIXER_SCLK);
 #endif
 }
 
@@ -476,6 +486,15 @@ uint16_t rffc5071_set_frequency(uint16_t mhz, uint32_t hz) {
 	return tune_freq;
 }
 
+void rffc5071_set_gpo(uint8_t gpo)
+{
+	/* We set GPO for both paths just in case. */
+	set_RFFC5071_P1GPO(gpo);
+	set_RFFC5071_P2GPO(gpo);
+
+	rffc5071_regs_commit();
+}
+
 #ifdef TEST
 int main(int ac, char **av)
 {
diff --git a/firmware/common/rffc5071.h b/firmware/common/rffc5071.h
index c9a5e08e..dc62af37 100644
--- a/firmware/common/rffc5071.h
+++ b/firmware/common/rffc5071.h
@@ -31,6 +31,21 @@ extern uint32_t rffc5071_regs_dirty;
 #define RFFC5071_REG_SET_CLEAN(r) rffc5071_regs_dirty &= ~(1UL<<r)
 #define RFFC5071_REG_SET_DIRTY(r) rffc5071_regs_dirty |= (1UL<<r)
 
+#ifdef JAWBREAKER
+/*
+ * RF switches on Jawbreaker are controlled by General Purpose Outputs (GPO) on
+ * the RFFC5072.
+ */
+#define SWITCHCTRL_NO_TX_AMP_PWR (1 << 0) /* turn off TX amp power */
+#define SWITCHCTRL_AMP_BYPASS    (1 << 1) /* bypass amp section */
+#define SWITCHCTRL_TX            (1 << 2) /* 1 for TX mode, 0 for RX mode */
+#define SWITCHCTRL_MIX_BYPASS    (1 << 3) /* bypass RFFC5072 mixer section */
+#define SWITCHCTRL_HP            (1 << 4) /* 1 for high-pass, 0 for low-pass */
+#define SWITCHCTRL_NO_RX_AMP_PWR (1 << 5) /* turn off RX amp power */
+
+#define SWITCHCTRL_SAFE (SWITCHCTRL_NO_TX_AMP_PWR | SWITCHCTRL_AMP_BYPASS | SWITCHCTRL_TX | SWITCHCTRL_MIX_BYPASS | SWITCHCTRL_HP | SWITCHCTRL_NO_RX_AMP_PWR)
+#endif
+
 /* Initialize chip. Call _setup() externally, as it calls _init(). */
 extern void rffc5071_init(void);
 extern void rffc5071_setup(void);
@@ -62,4 +77,6 @@ extern void rffc5071_rxtx(void);
 extern void rffc5071_enable(void);
 extern void rffc5071_disable(void);
 
+extern void rffc5071_set_gpo(uint8_t);
+
 #endif // __RFFC5071_H
diff --git a/firmware/sgpio-rx/sgpio-rx.c b/firmware/sgpio-rx/sgpio-rx.c
index afb168a0..a6ec38fd 100644
--- a/firmware/sgpio-rx/sgpio-rx.c
+++ b/firmware/sgpio-rx/sgpio-rx.c
@@ -329,27 +329,6 @@ int main(void) {
 	rffc5071_rx();
 	rffc5071_set_frequency(500, 0); // 500 MHz, 0 Hz (Hz ignored)
 
-#ifdef LOLLIPOP_SWITCH_SET_UP_DONE_IN_RFFC5071
-	/* lollipop */
-	uint8_t gpo = 
-			  (1 << 0)  /* SWTXB1 (!tx_bypass) */
-			| (0 << 1)  /* SWRXB1 (rx_bypass) */
-			| (1 << 2)  /* SWTXA1 (tx_hp) */
-			| (0 << 3)  /* unused */
-			| (1 << 4)  /* SWRXA1 (rx_hp) */
-			| (0 << 5); /* SWD1 (!tx_ant) */
-	/* licorice */
-	//uint8_t gpo = 
-			  //(0 << 0)  /* MIX_BYPASS */
-			//| (0 << 1)  /* AMP_BYPASS */
-			//| (0 << 2)  /* TX */
-			//| (0 << 3)  /* unused */
-			//| (0 << 4)  /* HP */
-			//| (0 << 5); /* !AMP_PWR */
-	rffc5071_reg_write(RFFC5071_GPO, (gpo << 9) | (gpo << 2) | 0x3);
-	gpio_set(PORT_LED1_3, (PIN_LED1)); /* LED1 on */
-#endif
-
 	max2837_set_frequency(freq);
 	max2837_start();
 	max2837_rx();