This document is an addendum to TIA Telecommunications Service Bulletin TSB-88-B. It is intended to clarify the default ENBW of analog FM receivers that are deployed in the VHF and UHF bands as indicated in Annex A and Table 2.

• Radios in the VHF (high band) that utilize ± 5 kHz deviation often use an IF bandwidth of 16 kHz

• Radios in the UHF (380 - 512 MHz) that utilize ± 5 kHz deviation often use an IF bandwidth of 16 kHz.

• Radios in the 800 MHz band but not the NPSPAC band that utilize ± 5 kHz deviation often use an IF bandwidth of 16 kHz

• Radios in the 800 MHz band that operate in the NPSPAC band with ± 4 kHz deviation require a narrower IF bandwidth to achieve a 20 dB ACRR.

• Narrow analog FM radios do not provide 60 dB ACRR unless a very narrow ENBW in utilized. Some manufacturers do not provide this capability as it is not required by TIA/ANSI 603C.

Various editorial errors are also corrected.