Kenwood TH-25A, TH-45A User Manual
Specifications and Main Features
- Mentioned Models:
- TH-25AT – 144 MHz FM transceiver featuring DTMF Pad.
- TH-25A – 144 MHz FM transceiver with no DTMF Pad.
- TH-25E – 144 MHz FM transceiver as well, but with Tone (Tone Burst for UK version).
- TH-45AT – 430/440 MHz FM transceiver with DTMF Pad.
- TH-45A – 430/440 MHz FM transceiver, DTMF Pad excluded.
- TH-45E – 430 MHz FM transceiver featuring Tone but (Tone Burst for UK version).
- TH-55AT – 1200 mhz FM transceiver with DTMF Pad.
- TH-55E – 1200 mhz FM transceiver with Tone (Tone Burst Version for the UK)
- Frequencies in Range
- TH-25A/AT will cover a range of 144.000 - 147.995 MHZ for the USA and a range of 144.000 –145.995 MHZ for Europe and the UK.
- TH-45A/AT will cover ranges from 430.000 – 449.995 MHZ for the USA and from 430.000 – 439.9395 MHZ for Europe/UK.
- TH-55AT/E ranges from 1258.000 – 1300.000 MHZ for the USA and others.
- Mode: F3E (FM)
- Memory Channels: 14
- Frequency Step (kHz):
- TH-25A/25AT: 5, 10
- TH-25E/45E: 12.5, 5
- TH-45A/45AT: 25, 5
- TH-55AT/55E: 25, 12.5
- Antenna Impedance: 50 Ohm
- Power Requirement: 6.16 (7.2 VDC nominal)
- Current Drain:
- HI 12 V (thro’ PB-8 or DC-1) Less than 1.2 A (TH-25), Less than 1.8 A (TH-45), Less than 1.0 A (TH-55)
- 9 V (thro’ BT-6): Approx. 0.9 A for TH-25; 1.4 A for TH-45; Less than 1.0 A for TH-55
- 7.2 V (thro’ PB-5/6/7/9) Approx. 0.8 A for TH-25, Approx. 1.1 A for TH-45, Approx. 0.8 A for TH-55
- LO transmit mode: less than 0.4 A for TH-25, less than 0.6 A for TH-45, TH-55
- Receive Mode Current Drain Approx. 55 mA (TH-25), Approx. 60 mA (TH-45, TH-55)
- Battery Saver Mode Current Drain Approx. 16 mA (TH-25), Approx. 17 mA (TH-45, TH-55)
- Automatic Power Off Mode Current Drain Approx. 6 mA (TH-25), Approx. 5 mA (TH-45, TH-55)
- Frequency Stability ±3 ppm (- 10 deg C to + 60 deg C)
- Ground Negative
- Dimensions mm
- TH-25A/25AT: 58 x 137.5 x 29.5
- TH-45A: 58 x 157.5 x 29.5
- TH-55AT/E: 68.5 x 172 x 37.5
- Weight
- TH-25A: 400 g (0.88 lbs) - TH-45A: 450 g (0.99 lbs) Operating Temperature: −20 °C ~ +50 °C (−4 °F ~ 122 °F) Microphone Impedance: 2 k Ohm Transmitter Output Power: - HI 12 V (> 5 W For TH-25, 3.5 W For TH-45, 3.5 W For TH-55) - 9 V (TH-25 wird ca. 2.5 W ausgeben
- LO (<0.5W für TH-25, <0.1W für TH-45) Modulation Reactance: -Maximum Frequency Deviation: 45 kHz Spurious Radiation: Infrared Thermal Imaging Abelsong Lower than -60 dB (TH-25), Lower than -50 dB (TH-45) Receiver Circuitry: Double Conversion Superheterodyne Intermediate Frequencies (IF):
- 1er IF (MHz): 16.9 (TH-25), 30.825 (TH-45), 59.7 (TH-55) - 24.708 MHz, 30.825 MHz, 59.700 MHz
- Sensitivity (12 dB SINAD): Less than 0.16 µV (TH-25) Less than 0.18 µV (TH-45) Less than 0.25 µV (TH-55) -100 نسبت حساسیت
- Squelch Sensitivity : Less than 0.1 nV (TH-25), nV (TH-45) Less than 0.16 nV 600 3408 Korsovsky Selectivity: Types:
- -6 dB: More than 12 k Hz -40 dB Less than 28 k Hz - (TH-25). More than 32 k Hz for (TH-45) -6 dB.
- Variable Range: More than +5 kHz (RIT) Audio Output Power: More than 200 mW (across 8 Ohm load at 10% distortion)
Frequently Asked Questions
Q1: What frequency ranges do the TH-25 and TH-45 Models work on?
- A1: The TH-25 models function on the bands of 144.000 – 147.995 MHz while the US’ TH-45 model works on 430.000 - 449.995 MHz.
Q2: Are there any memory channels that can be accessed? If yes, then how many are there?
- A2: Each model of this transceiver offers a diverse range of 14 memory channels.
Q3: What is the output power associated with the TH-55 series models?
- A3: As for the TH-55 series, the output power is expected to remain over 5 W with the HI mode on at 12 V and roughly 3.5 W at 9 V.
Q4: Is it permissible to use alkaline batteries in these apparatus?
- A4: Yes, as long as the BT-6 battery case is used, alkaline batteries can also be used.
Q5: Which battery is recommended for prolonged operations?
- A5: To ensure a longer or extended operation, the use of NiCd battery pack is recommended.
Q6: Can these transceivers be used for a long period of time without draining the battery?
- A6: Yes, these transceivers have a battery saver mode which uses minimal battery power.
Q7: What steps should be taken if the speaker produces no sound?
- A7: Make sure that the squelch is not closed and that the PTT switch is not pressed since this will roll out the possibility of receiving any sound.
Q8: These transceivers come with what ranges of operating temperature?
- A8: The range of operating temperature is from −20 degrees Celsius, to +50 degrees(−4 degrees Fahrenheit to 122 degrees Fahrenheit).
User Manual
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