Icom IC-F24 Service Manual

Also see for IC-F24: Instruction manual Instruction manual Servise manual

Contents

Icom IC-F24 Service Manual Manual pdf 4 page image

1 - 1SECTION 1 SPECIFICATIONS GENERAL• Frequency coverage : 400–470 MHz [USA–02], [GEN–02], [EUR]450–512 MHz [USA–03]450–520 MHz [GEN–03]• Type of emission :• Number of conventional channels : 2 ch (IC-F24S/F25S), 16 ch (IC-F24/F25)• Antenna impedance : 50 Ω (nominal)• Operating temperature range : –30˚C to +60˚C (–22˚F to +140˚F) [USA], [GEN]–25˚C to +55˚C [EUR]• Power supply requirement : 7.2 V DC nominal (negative ground)• Current drain (at 7.2 V DC ; approx.) :• Dimensions (projections not included) : 53(W)×120(H)×38(D) mm; 23⁄32(W)×423⁄32(H)×11⁄ 2(D) in• Weight (Including BP-231) : Approximately 260 g (9 3⁄16 oz ) TRANSMITTER• Output power (at 7.2 V DC) : 4 W• Modulation : Variable reactance frequency modulation• Maximum permissible deviation : ±5.0 kHz (Wide), ±4.0 kHz (Middle), ±2.5 kHz (Narrow)• Frequency error : ±2.5 ppm• Spurious emissions : 70 dB (min.) [USA], [GEN]0.25 μW (≤1 GHz), 1.0 μW (>1 GHz) [EUR]• Adjacent channel power : 70 dB min. (75 dB typical) for Wide70 dB min. (73 dB typical) for Middle60 dB min. (68 dB typical) for Narrow• Audio harmonic distortion : 3% typical (1 kHz, 40% deviation)• Hum and Noise ([USA], [GEN]) : 40 dB min. (46 dB typical) for Wide(without CCITT filter) 34 dB min. (40 dB typical) for Narrow• Residual modulation ([EUR] only) : 45 dB min. (55 dB typical) for Wide(with CCITT filter) 43 dB min. (53 dB typical) for Middle40 dB min. (50 dB typical) for Narrow• Limiting charact of modulator : 60–100% of maximum deviation• Microphone impedance : 2.2 kΩ RECEIVER• Receive system : Double conversion superheterodyne system• Intermediate frequencies : 1st IF: 46.35 MHz, 2nd IF: 450 kHz• Sensitivity : 0.25 μV (–119 dBm) typical at 12 dB SINAD [USA], [GEN]–4 dBμV (–111 dBm) emf typical at 20 dB SINAD [EUR]• Squelch sensitivity (at threshold) : 0.25 μV typical [USA], [GEN]–4 dBμV emf typical [EUR]• Adjacent channel selectivity : 70 dB min. (75 dB typical) for Wide70 dB min. (73 dB typical) for Middle60 dB min. (65 dB typical) for Narrow• Spurious response : 70 dB min.• Intermodulation rejection ratio : 70 dB min. (74 dB typical) [USA], [GEN]65 dB min. (67 dB typical) [EUR]• Hum and Noise ([USA], [GEN] only) : 40 dB min. (45 dB typical) for Wide(without CCITT filter) 34 dB min. (40 dB typical) for Narrow• Hum and Noise ([EUR] only) : 45 dB min. (55 dB typical) for Wide(with CCITT filter) 43 dB min. (53 dB typical) for Middle40 dB min. (50 dB typical) for Narrow• Audio output power : 0.5 W typical at 5% distortion with an 8 Ω load• Output impedance (Audio) : 8 ΩSpecifications are measured in accordance with EIA-152-C/204D, TIA-603 or EN 300 086.All stated specifications are subject to change without notice or obligation.VERSION WIDE MIDDLE NARROW[USA], [GEN] 16K0F3E (25.0 kHz) N/A 11K0F3E (12.5 kHz)[EUR] 14K0F3E (20.0 kHz) 8K50F3E (12.5 kHz)RECEIVING TRANSMITTINGStand-by Max. audio High (at 4 W) Low (at 1 W)75 mA 300 mA 1.6 A 0.8 A