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The FUCHS SO/25 is an HF Transceiver used by the South African military. Its also reffered to a B25 and a similar product is the French Thomson TRC-300. Several interconnecting modules are used to configure the transceiver for manpack, mobile or fixed station use.
I purchased the B25 faulty in 2005 but was not able to locate service / circuit data and ended up selling it in 2006.
- Frequency Range: 2.000MHz ~ 29.999MHz
- Operation Modes: A2J (CW); A3H (AM); A3J (USB and LSB)
- Frequency Step: 1 kHz
- Frequency Stability: +/- 1X 10-6
- Antenna: 2.315m whip or 7m longwire
- Antenna Impedance: 50 Ohms direct + ATU support for whip & wire
- Tempreature Range: -15 DegC ~ +55 DegC
- Dimensions (HxWxD): 421mm x 212.5mm x 92.5mm
- Weight: 7.5Kgs
Power
- Battery: 14.4V (12x1.2V 4AH NiCAD) - built-in charger accepts 10~32V.
- Battery life: 12 to 15 hours based on 1:9 transceiving / receiving ratio (speech)
- KB/26 PSU module (pictured): 12~24V
- Current: 0.45A RX, 3A TX Low, 4A TX High
- Sensitivity: >0.4uV(12dB(s+n)/n)
- Image Rejection: -90dB
- 1st IF Rejection: -80dB
- CW Bandwith: 300Hz
- AM Bandwith: 3kHz
- SSB Bandwith: 2.7kHz @ 6dB
- AF Power: 10mW into 300 Ohms, 20mW into 150 Ohms
- AGC: AF level does not vary more than 3dB through an input range of 1uV to 100mV
TX
- A2J Output Power: 10W (CW) into 50 Ohms
- A3J Output Power: 6W PEP Low or 20W PEP High (USB or LSB) into 50 Ohms
- Carrier & unwanted sidband rejection: >= 40dB in AJ3 mode.
- Linearity: <25dB
- Dynamic AF Range: 15dB
- Harmonics: -40dB
- Compression Time: appx. 1.5us
- Output Protection: short and open circuits
Cards
Each card is colour coded and those that are a similar size are uniquly keyed to avoid the wrong card being plugged into the wrong slot.
Pinouts
