BOMAN CB-950 40 Channels SSB AM Mobile CB Transceiver Instruction Manual

BOMAN CB-950 40 Channels SSB AM Mobile CB Transceiver

TECHNICAL SPECIFICATIONS

GENERAL

• Frequency Control PLL [phase lock loop] synthesizer
• Channels 40 channels
• Mode of Operation LSB, USB and AM
• Power Source Voltage 13.8 V DC
• Speaker [built-in] 3″ dynamic type, 8 n
• Microphone Dynamic type with PTT bar

RECEIVER

• System
  • SSB: Single conversion superheterodyne
  • AM: Dual conversion superheterodyne
• Sensitivity
  • SSB: 0.25 μV for 10 dB S/N
  • AM: 1 μV for 10 dB S/N
• Selectivity
  • SSB: 2.5 kHz at 6 dB down
  • AM: 6 kHz at 6 dB down
• Clarifier ±600 Hz range
• Audio Output 3 watts at 8 n
• Squelch Range
  • SSB: 0.7 μV to 20 μV
  • AM: 1 μV to 500 μV
• IF
  • SSB: 10.695 MHz
  • AM: 1st; 10.695 MHz, 2nd; 0.455 MHz

SSB TRANSMITTER

• Generation Double Balanced Modulator with Crystal Latice Filter
• RF Output Power 12 W P.E.P., FCC maximum, at 13.8 V DC
• Carrier Suppression More than 40 dB down
• Unwanted Side Band Suppression More than 60 dB down
• Harmonic Suppression More than 60 dB down

AM TRANSMITTER

• RF Output Power 4 watts [ FCC max.] , at 13.8 V DC
• Harmonic Suppression More than 60 dB down
• Modulation High Class Level B

OPERATING CONTROLS

FRONT PANEL

1. SWR-CAL-RF/S meter: This meter functions in three ways. When receiving this indicates relative strength of incoming signals and when transmitting RF power output. [To watch these functions, the SWR­CAL-S/RF switch must be placed in “S/RF” position.] The measure­ment of your antenna SWR and its prior calibration will be shown in lowest and middle scale. Please refer to SWR MEASUREMENT instruc­tion described in following pages.
2. CLARIFIER control: During AM reception, if a station received is not clear, adjust this control for clearer reception refering S meter indica­tion. During SSB reception, also rotate this until clearer voice of your partner is obtained.
3. SWR/CAL control: Used for calibration prior to SWR measurement of your antenna system. Refer to SWR MEASUREMENT instruction.
4. DIMMER control: Controls the illumination strength of channel indicator LED [Light Emitting Diode].
5. CHANNEL INDICATOR: An LED digital read-out to show the channel your have desired.
6. AM MOD LAMP: Lights up variously according to the modulation strength in AM transmitting.
7. CHANNEL SELECTOR: Selects one of 40 channels by rotating the knob. you can read the channel selected by clear LED indication directly.
8. SQUELCH control /PA switch: Your radio has been equipped with a PA [Public Adress] amplifier system. Setting the control fully counterclockwise position actuates the PA system. Press the Push-to-Talk bar on the microphone and speak at a normal tone of voice, then your voice will be heard thru the PA speaker connected to the PA SP jack on the rear panel. For CB operation this functions as Squelch control, so you must place the control in other than PA position. Turn the knob clockwise until background noise disappears. Now you can hear signals without annoying background noises. However, rotating the Squelch too far clockwise direction decreases reception sensitivity and very weak station would not be received, therefore when you are in communication with a distant or weak station rotate the Squelch all the way counterclockwise.
9. VOLUME control/Power on-off switch: Turns the power on or off and controls the sound output from the speaker when receiving.
10. LSB-USB-AM switch: Selects a mode of operation. For AM operation, place this in AM. To operate the unit as an SSB transceiver selects LSB or USB. This affects both transmit and receive simultaneously.
11. RF GAIN-OFF switch: Changes receiver sensitivity. If a station trans­mitting is very close, place this in “0 FF” position.
12. NB-OFF switch: Your radio has been equipped with an NB [Noise Blanking] circuit. During the reception, when you have come to encounter the “impulse” type noise, place this in NB and the NB circuit will blank them out.
13. S/RF-CAL-SWR meter switch: Selects meter functions in three ways. For usual CB operation, both in AM and SSB, always set this in the S/RF position. For antenna SWR measurement and its prior calibration, refer to SWR MEASUREMENT instructions. REAL PANEL
14. DC POWER connector: Used for connection with DC power cord supplied. For further details, see DC POWER CONNECTION instructions.
15. PA SP jack: Used for connection with PA speaker with an impedance of 8 to 16 n. Matches 3.5 mm¢, standard type plug.
16. EXT. SP jack: Used for connection of EXT [external] speaker with an impedance of 8 to 16 n. Matches 3.5 mm¢, standard type phone plug. Note that insertion of an external speaker into this jack will automatically silence the internal [built-in] speaker.
17. ANT [antenna] connector: Used for connection with antenna, matches PL-259 type [standard] plug.

MOBILE INSTALLATION

First choose a location to be mounted. The location should be the place that is convenient to use the transceiver and does not interfere the driver. Usually underside of the instrument panel or dashboard of a vehicle will be selected. A special bracket for this purpose is supplied with the unit.

1. The transceiver will be mounted as illustrated in Figure 3 (B). First drill three or four holes (diameter about: 3.6 mm: 9/64″) to the location to be mounted.
2. Attach the bracket, using self-tapping screws and washers supplied.
3. A microphone hanger is also supplied with the unit. If necessary, also attach the bracket on a place close to the transceiver, using two screws included.
4. Secure the transceiver to the bracket by means of the large thumb screws and washers supplied.

OPERATION

MAKE SURE YOUR ANTENNA SYSTEM IS CONNECTED TO THE ANTENNA CONNECTOR ON THE REAR PANEL. DO NOT OPERATE THE TRANSCEIVER WITHOUT A CONNECTION TO YOUR ANTENNA SYSTEM.

AM Operation

1. Connect the Push-to-Talk microphone to the MIC jack.
2. Turn the power on and increase the sound level.
3. Temporarily rotate the PA/SOUE LCH control to 9 o’clock position.
4. Place the LSB-USB-AM switch in the AM position.
5. Select a channel you desired.
6. To transmit: Depress the Push-to-Talk button on the microphone and speak into the microphone at a normal voice, holding the micro­phone 3 to 6 inches from the mouth. Do not shout or move the micro­phone too close to your mouth.
7. To receive: simply release the Push-to-Talk button.
8. If necessary adjust the clarifier control for clearer reception.

SSB Reception

1. Turn the power on and rotate the VOLUME control to a proper sound level.
2. Temporarily place the LSB-USB-AM switch in the AM position. If the signal you received is a AM signal, clear voice reception will be obtained. But if the signal produces unintelligible sound, it may be the SSB signal. First place the LSB-USB-AM switch in the LSB or USB position at which clearer voice reception is obtained. Then adjust the clarifier control slowly for clearest voice reception.
3. If necessary adjust SOUE LCH, AN L, NB controls as previously stated.

SSB Transmission

1. First select the channel you want.

2. Place the LSB-USB-AM switch in the LSB or USB position.
   NOTE:
   If you want to communicate with the station transmitting in a mode of LSB, your transceiver must be set in the same mode ( LSB) of operation. This will be true for USB operation. To know a station is being transmitted in either mode of operation, temporarily try to receive the station as stated under SSB reception.

3. To transmit depress the Push-to-Talk button on the microphone and speak at the microphone as stated in the step 6 under AM operation.

4. To receive, simply release the Push-to-Talk button.

When using the transceiver as a public address amplifier.

1. Connect a PA speaker (8-16 ohms) to the PA jack on the rear panel.
2. Place the PA/SQUELCH control in the PA position.
3. Turn the power on.
4. Depress the Push-to-Talk button on the microphone and speak at the microphone.

SWR MEASUREMENT INSTRUCTIONS

SWR is a measure of how your antenna is matched to your transmitter. A desirable SWR is 1.5 : 1 or less. With your antenna properly connected, measure your SWR as follows.

1. Set Squelch/PA control out of PA position [about 9 o’clock position].
2. Set S/R F-CAL-SWR meter switch to CAL position.
3. Press the Push-to-talk switch and adjust CAL control so that the meter pointer coincides with SET mark on the meter.
4. Release the push-to-talk switch.
5. Set the S/RF-CAL-SWR switch to SWR position and again press the push-to­talk switch. The SWR of your antenna system is shown on the lowest scale.
6. After checking SWR, be sure to set the S/RF-CAL-SWR switch to S/RF position so that the meter indicates Sand RF units.

DC POWER CONNECTION

This transceiver is designed to be operated from a 12 V DC battery on a Negative or Positive Ground System.

Power Connection for Negative Ground System

1. Connect Black power lead from the transceiver to the metal chassis ground of the vehicle or negative battery terminal.
2. Connect Red power lead from the transceiver to the any convenient hot (positive) side of the electrical system or Plus(+) battery terminal.

Power Connection for Positive Ground System

1. Connect Black power lead from the transceiver to any convenient hot (negative) side of the electrical system or Minus(-) battery terminal.
2. Connect Red power lead from the transceiver to the metal chassis ground of the vehicle or positive battery terminal.

NOTE:
When you are in doubt about the electrical ground system in your vehicle, please consult with your car dealer. But when you can not obtain the necessary information, directly connect the Red power lead to the Plus (+) battery terminal and Black power lead to the negative (-) battery terminal to avoid any possible short circuit due to misunderstanding.

ANTENNA CONNECTION

BEFORE OPERATING THE TRANSCEIVER, YOU MUST CONNECT A PROPER ANTENNA SYSTEM. OPERATING THE TRANSCEIVER WITHOUT AN ANTENNA OR A DUMMY LOAD MAY CAUSE DAMAGE TO THE EXPENSIVE RF POWER TRANSISTORS.

The antenna is one of the important factors in the operation of the transceiver with its full efficiency. The improper antenna may decrease reception sensitivity and lowers the communication range in transmitting. The CB antenna and its mounting method will largely depend upon the type of your vehicle, mounting position, etc. Also the antenna may be different according to your needs – using the transceiver as a mobile or base station transceiver. So we will recom­mend you to consult about these matters with your dealer from which you purchased the transceiver or any other CB/ Amateur radio equipment supplying shops. They will meet your specific needs.

INTERFERENCE NOISES IN RECEPTION

During reception you may find that your transceiver will pick up inter­ference noises which make the reception of weaker stations difficult. The most common source of these noises is the ignition system of your own vehicle, since your transceiver is placed relatively close to your ignition system (engine). In such a case, we will recommend you to consult with your car dealer to eliminate the ignition noise. Usually the ignition noise will be suppressed in a considerable degree by using a proper radio suppression type high voltage ignition wire and suppressor resistor in the ignition system. (Most vehicles employ these wire and resistor but it may necessary to check them for correct operation.) Another method to suppress the noises is to use additional noise suppressor which will be available from your local CB radio shops.

CHANNEL FREQUENCY CHART

Frequency| Channel| Frequency| Channel|
---|---|---|---|---
26.965MHz| 1| 27.215MHz| 21

22

23

24

26

27

28

29

30

32

33

38

40

|
26.975 MHz| 2|
27.225MHz|
26.985MHz

27.005MHz

| 3| 27.255MHz|
4| 27.235MHz|
27.015MHz| 5| 27.245MHz|
 |  |
27.025MHz| 6| 27.265MHz|
27.035MHz| 7|
27.275MHz|
27.055MHz| 8| 27.285MHz|
27.065MHz| 9| 27.295MHz|
27.075MHz| 10| 27.305MHz|
27.085MHz| 11| 27.315MHz|
27.105MHz| 12|
27.325MHz|
27.115MHz| 13| 27.335MHz|
27.125MHz

27.135MHz

| 14| 27.345MHz

27.355MHz

|
27.155MHz| 16| 27.365MHz|
27.165MHz| 17| 27.375MHz|
27.175MHz| 18| 27.385MHz|
27.185MHz| 19| 27.395MHz|
27.205MHz| 20| 27.405MHz|

SCHEMATIC DIAGRAM

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