United States Air Force Auxiliary
CAP National Technology Center

Consolidated NTIA Standards for VHF & HF Radios

 
VHF Wideband
  Base / Mobile / Portable
Freq Stability 5.0 PPM
TX Unwanted Emissions 29LOG(Fd²/11) or 50 dB whichever is less
RX Adjacent Chan Selectivity 80 dB / 80 dB / 70 dB
RX Intermod Rejection 70 dB / 70 dB / 50 dB
RX Spurious Rejection 85 dB / 85 dB / 60 dB
RX Conducted Spurious Emissions -57 dBm
Testing Procedure Used TIA / EIA 603

 
VHF Narrowband Analog (Pre Jan 2006) (Post Jan 2006)
  Base / Mobile / Portable Base / Mobile / Portable
Freq Stability 2.5 PPM 1.5 PPM / 2.5 PPM / 2.5 PPM
TX Unwanted Emissions 50+10LOG(pZ) or 70 dB whichever is less 50+10LOG(pZ) or 70 dB whichever is less
RX Adjacent Chan Selectivity 70 dB / 70 dB / 60 dB 45 dB
RX Intermod Rejection 70 dB / 70 dB / 50 dB 75 dB / 75 dB / 70 dB
RX Spurious Rejection 70 dB / 70 dB / 60 dB 75 dB / 75 dB / 70 dB
RX Conducted Spurious Emissions -57 dBm -57 dBm
Testing Procedure Used TIA / EIA 603 TIA / EIA 603-B or later
Note: Radios acquired or placed in service prior to Jan 2006 may continue to be used until the end of their life cycle. (Ref: 47 CFR 300 5.3.5.2, Effective Dates)

 
VHF Narrowband Digital (Pre Jan 2006) (Post Jan 2006)
  Base / Mobile / Portable Base / Mobile / Portable
Freq Stability 2.5 PPM 1.5 PPM / 2.5 PPM / 2.5 PPM
TX Unwanted Emissions 50+10LOG(pZ) or 70 dB whichever is less 50+10LOG(pZ) or 70 dB whichever is less
RX Adjacent Chan Selectivity 60 dB / 60 dB / 50 dB 60 dB
RX Intermod Rejection 70 dB / 70 dB / 50 dB 80 dB / 75 dB / 70 dB
RX Spurious Rejection 70 dB / 70 dB / 60 dB 90 dB / 80 dB / 70 dB
RX Conducted Spurious Emissions -57 dBm -57 dBm
Testing Procedure Used TIA / EIA 603 & TSB 102.CAA TIA / EIA 603-B & TSB 102.CAAA-A or later
Note: Radios acquired or placed in service prior to Jan 2006 may continue to be used until the end of their life cycle. (Ref: 47 CFR 300 5.3.5.2, Effective Dates)

 
HF / SSB & HF / ISB
  Base/Mobile/Portable
Freq Stability +/- 20 Hz.
TX Unwanted Emissions 43+10LOG(pX)      Example: Peak Envelope Power (pX) = 125 watts, requires 63.9 dB suppression
Carrier Suppression 40 dB below pX
RX Selectivity Passband (-6 dB point of the filter) shall be no greater than the authorized bandwidth of emission, typically 3 KHz

 
HF / AM (Below 29.5 MHz.)
  Base/Mobile/Portable
Freq Stability 20 PPM / 30 PPM / 30 PPM
TX Unwanted Emissions 40 dB / 40 dB / 30 dB
Carrier (SSB Transmitter) + / - 6 dB from pX

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