This read-write object sets how far, in KHz, the demodulator will sweep around the configured Rx frequency while trying to acquire lock, ranging up to +/-32 KHz at lower symbol rates or up to +/-200 KHz at symbol rates of 625 ksym/s and above. This compensates for frequency uncertainty from LO drift, Doppler shift, or slight frequency-plan errors, so widening it increases the chance of acquiring lock on a slightly mistuned or drifting carrier, at the cost of a longer acquisition search and a small risk of locking onto an adjacent, unwanted carrier if set too wide. On a mobile or Doppler-affected link where the actual carrier frequency can wander by tens of KHz, an admin would increase this sweep width toward its 200 KHz ceiling to keep the demodulator able to reacquire lock after brief outages.