diff --git a/IO.cpp b/IO.cpp
index 21b382b..805c21e 100644
--- a/IO.cpp
+++ b/IO.cpp
@@ -307,6 +307,7 @@ bool CIO::hasRXOverflow()
   return m_rxBuffer.hasOverflowed();
 }
 
+#if defined(ZUMSPOT_ADF7021)
 void CIO::checkBand(uint32_t frequency_rx, uint32_t frequency_tx) {
   if (!(io.hasSingleADF7021())) {
     // There are two ADF7021s on the board
@@ -345,6 +346,7 @@ uint8_t CIO::checkZUMspot(uint32_t frequency_rx, uint32_t frequency_tx) {
   }
   return 0U;
 }
+#endif
 
 uint8_t CIO::setFreq(uint32_t frequency_rx, uint32_t frequency_tx, uint8_t rf_power, uint32_t pocsag_freq_tx)
 {
diff --git a/IO.h b/IO.h
index e8bb5ff..fac37fe 100644
--- a/IO.h
+++ b/IO.h
@@ -115,8 +115,6 @@ public:
   void      process(void);
   bool      hasTXOverflow(void);
   bool      hasRXOverflow(void);
-  void      checkBand(uint32_t frequency_rx, uint32_t frequency_tx);
-  uint8_t   checkZUMspot(uint32_t frequency_rx, uint32_t frequency_tx);
   uint8_t   setFreq(uint32_t frequency_rx, uint32_t frequency_tx, uint8_t rf_power, uint32_t pocsag_freq_tx);
   void      setPower(uint8_t power);
   void      setMode(MMDVM_STATE modemState);
@@ -126,9 +124,13 @@ public:
   uint32_t  getWatchdog(void);
   void      getIntCounter(uint16_t &int1, uint16_t &int2);
   void      selfTest(void);
+#if defined(ZUMSPOT_ADF7021)
+  void      checkBand(uint32_t frequency_rx, uint32_t frequency_tx);
+  uint8_t   checkZUMspot(uint32_t frequency_rx, uint32_t frequency_tx);
   void      setBandVHF(bool vhf_on);
   bool      hasSingleADF7021(void);
   bool      isDualBand(void);
+#endif
 
   // RF interface API
   void      setTX(void);
diff --git a/IOSTM.cpp b/IOSTM.cpp
index 6c75837..208cdeb 100644
--- a/IOSTM.cpp
+++ b/IOSTM.cpp
@@ -754,6 +754,7 @@ void CIO::COS_pin(bool on)
   GPIO_WriteBit(PORT_COS_LED, PIN_COS_LED, on ? Bit_SET : Bit_RESET);
 }
 
+#if defined(ZUMSPOT_ADF7021)
 void CIO::setBandVHF(bool vhf_on) {
   GPIO_WriteBit(PORT_SET_BAND, PIN_SET_BAND, vhf_on ? Bit_SET : Bit_RESET);
 }
@@ -765,6 +766,7 @@ bool CIO::hasSingleADF7021() {
 bool CIO::isDualBand() {
   return GPIO_ReadInputDataBit(PORT_DL_DPX, PIN_DL_DPX) == Bit_SET;
 }
+#endif
 
 /**
  * Function delay_us() from stm32duino project