Since these RC combinations have long time constants, they cannot readily respond to the transients produced at band crossings and scan resets. Therefore, whenever the sample and hold circuit is holding, R24 to R26 are shorted by Q4 to QS respectively.

+9 V and -9 V Reference Supplies @I

U2B and U7B and their associated circuitry form -9 V and +9 V reference supplies used in the YTX Driver, and elsewhere in the A6 RF Module.

4A6A12