diff --git a/firmware/application/clock_manager.cpp b/firmware/application/clock_manager.cpp
index 32b92ce5..c8924781 100644
--- a/firmware/application/clock_manager.cpp
+++ b/firmware/application/clock_manager.cpp
@@ -561,26 +561,32 @@ void ClockManager::stop_audio_pll() {
 }
 
 void ClockManager::enable_clock_output(bool enable) {
-    if (enable) {
-        clock_generator.enable_output(clock_generator_output_og_clkout);
-        if (portapack::persistent_memory::clkout_freq() < 1000) {
-            clock_generator.set_ms_frequency(clock_generator_output_og_clkout, portapack::persistent_memory::clkout_freq() * 128000, si5351_vco_f, 7);
-        } else {
-            clock_generator.set_ms_frequency(clock_generator_output_og_clkout, portapack::persistent_memory::clkout_freq() * 1000, si5351_vco_f, 0);
-        }
-    } else {
-        clock_generator.disable_output(clock_generator_output_og_clkout);
+    if (hackrf_r9) {
+        gpio_r9_clkout_en.output();
+        gpio_r9_clkout_en.write(enable);
+
+        // NOTE: RETURNING HERE IF HACKRF_R9 TO PREVENT CLK2 FROM BEING DISABLED OR FREQ MODIFIED SINCE CLK2 ON R9 IS
+        // USED FOR BOTH CLKOUT AND FOR THE MCU_CLOCK (== GP_CLKIN) WHICH OTHER LP43XX CLOCKS CURRENTLY RELY ON.
+        // FUTURE TBD: REMOVE OTHER LP43XX CLOCK DEPENDENCIES ON GP_CLKIN, THEN DELETE THE return LINE BELOW TO ALLOW
+        // CLKOUT FREQ CHANGES ON R9 BOARDS.
+        return;
     }
 
-    auto si5351_clock_control_common = hackrf_r9
-                                           ? si5351a_clock_control_common
-                                           : si5351c_clock_control_common;
-    const auto ref_pll = hackrf_r9
-                             ? ClockControl::MultiSynthSource::PLLA
-                             : get_si5351c_reference_clock_generator_pll(reference.source);
+    auto clkout_select = hackrf_r9 ? clock_generator_output_r9_clkout : clock_generator_output_og_clkout;
 
-    if (enable)
-        clock_generator.set_clock_control(clock_generator_output_og_clkout, si5351_clock_control_common[clock_generator_output_og_clkout].ms_src(ref_pll).clk_pdn(ClockControl::ClockPowerDown::Power_On));
-    else
-        clock_generator.set_clock_control(clock_generator_output_og_clkout, ClockControl::power_off());
+    if (enable) {
+        clock_generator.enable_output(clkout_select);
+        if (portapack::persistent_memory::clkout_freq() < 1000) {
+            clock_generator.set_ms_frequency(clkout_select, portapack::persistent_memory::clkout_freq() * 128000, si5351_vco_f, 7);
+        } else {
+            clock_generator.set_ms_frequency(clkout_select, portapack::persistent_memory::clkout_freq() * 1000, si5351_vco_f, 0);
+        }
+
+        auto si5351_clock_control_common = hackrf_r9 ? si5351a_clock_control_common : si5351c_clock_control_common;
+        const auto ref_pll = hackrf_r9 ? ClockControl::MultiSynthSource::PLLA : get_si5351c_reference_clock_generator_pll(reference.source);
+        clock_generator.set_clock_control(clkout_select, si5351_clock_control_common[clkout_select].ms_src(ref_pll).clk_pdn(ClockControl::ClockPowerDown::Power_On));
+    } else {
+        clock_generator.disable_output(clkout_select);
+        clock_generator.set_clock_control(clkout_select, ClockControl::power_off());
+    }
 }
diff --git a/firmware/common/hackrf_hal.hpp b/firmware/common/hackrf_hal.hpp
index 9e5e2695..2798a4ad 100644
--- a/firmware/common/hackrf_hal.hpp
+++ b/firmware/common/hackrf_hal.hpp
@@ -68,6 +68,7 @@ constexpr size_t clock_generator_output_og_mcu_clkin = 7;
 
 constexpr size_t clock_generator_output_r9_if = 0;
 constexpr size_t clock_generator_output_r9_sgpio = 1;
+constexpr size_t clock_generator_output_r9_clkout = 2;
 constexpr size_t clock_generator_output_r9_mcu_clkin = 2;
 
 /* ADC0 */