If the MAX2871 is selecting the wrong VCO band, check if the VAS_TEMP or VCO auto select temperature compensation feature is enabled.
Enabling VAS_TEMP / VCO auto select temperature will fix the issue.
MAX2871
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The MAX2871 is an ultra-wideband phase-locked loop (PLL) with integrated voltage control oscillators (VCOs) capable of operating in both integer-N and...
Datasheet
MAX2871 on Analog.com
If the MAX2871 is selecting the wrong VCO band, check if the VAS_TEMP or VCO auto select temperature compensation feature is enabled.
Enabling VAS_TEMP / VCO auto select temperature will fix the issue.
