CRT SS 7900

| noviembre 4, 2019

CRT SS 7900
CB Radio Transceiver 10M Mobile, AM/FM/SSB.

The CRT SS 7900 models from end 2019 have a TCF (Tone Squelch Function). This allows to enter a CTCSS or a DCS code on each channel. Only available on FM band !

You can select one of the 104 DCS codes and 38 CTCSS codes. After a code is selected it stays active on that channel even when radio is switched off. The display will show when a DCS or CTCSS code is activated on that channel.

To activate a CTCSS or DSC code; switch off the radio, switch on the radio, press MOD/TSQ until display will show MOD TSQ, immediate puch the channel slector, turn the channel selector to select the wanted code, press the cannel selector to validate the code.

The user manual in the box is not always accurate in the description of this function.


• Frequencies: 28-29.7 MHz.
• Modes: AM / FM / LSB / USB.
• Out Power: 12W AM / FM 30W / 30W SSB.
• Microphone jack on front panel with Up / Down Channels.

Big Display LCD with:
….Displaying Frequency or Channel.
….Viewing the Modulation Mode.
….Indicator Signal Reception and Transmission.

• SWR Level Indicator.
• Automatic Squelch (AM/FM) ASC.
• Adjustable Power AM / FM / SSB.
• Function Dual Watch.
• Emergency Channel.
• Function + 10Khz.
• Function Echo.
• Clarifier.
• Function Offset.
• CTCSS/DCS Encoder/Decoder (Included Original ) 38 CTCSS – 104DCS
• Roger Beep Function.
• Beep Function Keys.
• NB Filter / HI-CUT.
• Keypad Lock.
• TOT.
• SWR Protection.
• Function Monitoring.
• 6 Memory Programming.
• Programming by Software (Optional) Cable PC50 ref: TX000008.
• Dimensions: 200 x 280 x 60 (W x L x H).
• Weight: 1.5 Kg.


Frequency Range 28.000-29.700MHz (Programmable)
Frequency Band A/B/C/D/E/F/G/H/I
Channel 40channels (programmable) in each band
Frequency Control Phase-Locked-Loop Synthesizer
Frequency Step 100Hz, 1KHz, 10KHz, 100KHz, 1MHz
Frequency Tolerance ± 5.00 ppm
Temperature Range -20t to +50t
Microphone with push-to-talk /UP/DN and coiled cord
Input Voltage 13.8V
Dimensions (in mm) 250(W) x 280(L) x 60(H)
Weight 1.5kg
Antenna Connector UHF, SO239
Power Output AM: 12W / FM: 30W / SSB: 30W(PEP)
Drain 8A (with modulation)
Modulation AM/FM/USB/LSB
Inter-modulation Distortion SSB: 3rd order, more than -25dB; 5th order, more than -35dB
SSB Carrier Suppression 55dB
Unwanted Sideband 50dB
Frequency Response AM/FM: 300 to 3000Hz SSB: 450 to 2500Hz
Output Impedance 50ohms, unbalanced

SSB: 0.25μV for 10dB(S+N)/N at greater than 1/2-watt of audio outputAM:1.0μV for 10dB(S+N)/N at

greater than 1/2watt of audio output

FM: 1.0μV for 20 dB (S+N)/N at greater than 1/2

watt of audio output

Adjacent-Channel Selectivity AM/FM: 60dB SSB: 70dB
Image Rejection More than 65dB
IF Frequency AM/FM: 10.695MHz 1st IF, 455KHz 2nd IF SSB: 10.695MHz
RF Gain Control 45dB adjustable for optimum signal reception
Automatic Gain Control(AGC) Less than 10dB change in audio output for inputs from 10 to 100,000 microvolt.
Squelch Adjustable; threshold less than 1.0μV. Automatic Squelch Control(only AM/FM)1.0μV
Audio Output Power 3 watts into 8 ohms
Frequency Response AM/FM: 300 to 3000Hz SSB: 450 to 2500Hz
Built-in Speaker 8 ohms, round.
External Speaker(Not Supplied) 8 ohms; disables internal speaker when connected.

CRT SS 7900 Microphone

Electret Microphone with RJ-45 Connector

SS7900 SS-7900 Microphone diagram

1. Blue – NC
2. Red – TX/UP/DW
3. White – Audio
4. Black – Shield
5. NC
6. NC
7. NC
8. NC

CRT SS 7900 software download

PC cable set to program the CRT SS6900 and CRT SS7900 by computer. Software is free download

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