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81st Operations Support Flight Weather Operations Desk – Ground to Air Radio Requirement Technical Specifications for Ultra High Frequency (UHF) Receiver and Transmitter Systems Date: 15 Aug 2024
Purpose: To replace the unsupportable radio systems currently utilized by the Keesler Weather desk, the 81st Operations Support Flight requires one each Ultra High Frequency (UHF) radio receiver and one each UHF radio transmitter with the technical specifications listed below. The quoted equipment should be in line with the Air Force Flight Standards Agency (AFFSA) Air Traffic Control Radio Replacement (ATCRR) program guidance.
Table 1. UHF Receiver Characteristics
| PARAMETER |
| STANDARD |
| INITIAL TOLERANCE |
| OPERATING TOLERANCE |
| Input Power |
| 115/230 VAC, 50-60 Hz |
| Same as standard |
| Same as standard |
| Mechanical Data |
| Capability to be mounted in a standard 19” equipment rack |
| Same as standard |
| Same as standard |
Oscillator Frequency:
225.000 – 399.975 MHz
| Operating Frequency – 21.4 MHz |
| +/- 0.0001 percent |
| +/- 0.0005 percent |
| Sensitivity (Signal to Noise – 10 to 1 power ratio) |
| -98 dBm |
(3.0 µV) -98 dBm (3.0 µV) -93 dBm (5.0 µV)
| RF Squelch Threshold |
| -97.5 +/- 0.5 dBm |
(3.0 µV) max -97.5 +/- 0.5 dBm (3.0 µV) max -97.5 +/- 0.5 dBm (3.0 µV) max
| Squelch Close |
| From squelch threshold value to 7 dB below |
| From squelch threshold value to 7 dB below |
| From squelch threshold value to 7 dB below |
| Audio Voltage Control (AVC) Action Audio Level-Varying RF level |
| +/- 3 dB |
| +/- 4 dB |
| +/- 5 dB |
| AVC Action Audio Level – Varying Percent Modulation |
| +/- 1 dB |
| +/- 4 dB |
| +/- 4 dB |
| Selectivity (25 kHz Channel Spacing) |
| -6 dB, +/- 9 kHz min |
-60 dB, +/- 25 kHz max
| Same as standard |
| Same as standard |
| Selectivity (8.33 kHz Channel Spacing) |
| -6 dB, +/- 3.5 kHz min |
-60 dB, +/- 8.33 kHz max
| Same as standard |
| Same as standard |
Table 2. UHF Transmitter Characteristics
| PARAMETER |
| STANDARD |
| INITIAL TOLERANCE |
| OPERATING TOLERANCE |
| Input Power |
| 115/230 VAC, 50-60 Hz |
| Same as standard |
| Same as standard |
| Mechanical Data |
| Capability to be mounted in a standard 19” equipment rack |
| Same as standard |
| Same as standard |
| Keying Requirement |
| Variable voltage or ground key |
| Same as standard |
| Same as standard |
| Operating Frequency |
| 225.000 – 399.975 MHz |
| +/- 0.0001 percent |
| +/- 0.0005 percent |
| RF Output Power |
| 10 Watts |
| +1Watts to -1.5 Watts |
| +2Watts to -2.5 Watts |
| Modulation Level 1004 Hz tone |
| 90 percent |
| +/- 3 percent |
| +/- 3 percent |
| Standing Wave Ration (SWR) at Transmitter RF Output |
| 1.0:1 |
| 1.4:1 maximum |
| 1.4:1 maximum |