HARVARD H407 Owner'S Manual Download Page 1 | Manualshive

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H407

OWNER’S MANUAL

40-Channel FM Base Station

Citizenband

Transceiver

H407

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Summary of Contents for H407

Page 1: ...H407 OWNER S MANUAL 40 Channel FM Base Station Citizenband Transceiver H407 ...

Page 2: ...ground The front mounted speaker projects sound forward for better clarity A public address circuit allows you to convert the H407 into a paging system Jacks are provided for external speakers and PA speakers B RECEIVER A tuned RF stage is employed to pull in even weak signals The I F system is dual conversion and a ceramic filter is employed to reduce interference from adjacent channels A RF Gain...

Page 3: ... 3 ...

Page 4: ...e operating in an extremely noisy environment such as may be found In the cab of certain ergo trucks open sports cars or around noisy machinery in order to avoid or reduce the amount of noise that goes out with your signal you can reduce the microphone gain and by speaking more closely and loudly into the microphone reduce the ratio of noise to voice RF GAIN CONTROL This control allows you to adju...

Page 5: ...he Internal speaker May also be used for headphones DC POWER CORD To attach unit to positive or negative ground 12 Volts source a convenient quick disconnect is provided AC POWER CORD To operate unit from 240 Volts 60 Hz ordinary house current ANTENNA CONNECTOR A standard SO 239 type connector Is supplied for attaching either mobile or base antennas MICROPHONE The receiver and transmitter are cont...

Page 6: ...xial type antenna connector Microphone connector DC 12V Jack External Speaker Jack Public Address Speaker Jack 13 2 Volts DC positive or negative ground AC 240V 50 Hz Vinyl Clad Steel 210 D x29B W x90 H mm 5 Power Supply 6 Cabinet Description 7 Dimensions RECEIVER 1 Frequency Range MHz 2 Sensitivity 3 Selectivity 4 Adj Channel Rejection 5 Audio Power Output at 8 ohms at 4 ohms 6 Audio Fidelity 1 K...

Page 7: ...inals in your plug proceed as follows The wire which is coloured green and yellow must be connected to the terminal in the plug which is marked by the letter E or by the safety earth symbol or coloured green or green and yellow The wire which is coloured blue must be connected to the terminal which is marked with the letter N or coloured black The wire which is coloured brown must be connected to ...

Page 8: ...o the car body engine block etc NEGATIVE GROUND HOOKUP Attach the red fused wire to the fuse block terminal or any convenient plus lead Devices operated by the Ignition key such as the radio light etc are best since when you turn the ignition off the unit will be turned off Attach the black lead to the car body via any convenient method NOTE Many newer cars use plastic dash pieces Make sure the sc...

Page 9: ... antenna and whenever possible select the highest location within Home Office limits These limits are printed on the C B Licence form MOBILE ANTENNAS A vertical whip antenna is best suited for mobile use A non directional antenna must be used for best results in any case The base loaded whip antenna will normally provide effective communications For greater range and more reliable operation a full...

Page 10: ...ay be connected to any convenient terminal but preferably to the ignition switch to prevent unauthorized persons from operation of your unit With this method the unit will only operate when your key is turned on Engine ignition interference should not be a problem and vehicles equipped with standard broadcast radios will have enough suppression to eliminate ignition interference If interference is...

Page 11: ...button in On position and increase volume to desired level h With no signal present rotate Squelch control clockwise until the rushing noise disappears C TRANSMITTER CAUTION NEVER OPERATE YOUR H407 WITHOUTAN ADEQUATE ANTENNA SYSTEM OR LOAD ANTENNA SWR SHOULD NOT EXCEED 3 1 FAILURE TO FOLLOW THIS RECOMMENDATIONS COULD RESULT IN UNIT DAMAGE A Rotate the Channel selector to desired channel B Depress ...

Page 12: ...antenna s Performance is its SWR standing wave ratio COAXIAL CABLE Coaxial cable is used in all Citizens band installations This cable transfers the power from your transceiver to the antenna The output of your transceiver is 50 52 ohms Your antenna is designed to be 50 52 ohms For this reason RG58 U or RG8 U cable is used because it also is 52 ohms and matches the antenna to the unit The frequenc...

Page 13: ...own Again depress the transmit switch if the reading is the same or lower continue moving the whip down 1 4 inch at a time until the LOWEST reading is obtained on your transceiver RF meter If the reading was higher move the whip up 1 4 to 1 2 inch the first time and 1 8 to 1 4 inch thereafter until the LOWEST reading is obtained on the RF meter That s right THE LOWEST READING Your RF output mater ...

Page 14: ...this put the Channel Dial to Channel 1 and measure the SWR Next put the channel dial to Channel 40 and measure the SWR IF THE SWR WAS LOWEST ON CHANNEL 1 AND HIGHEST ON 40 THE WHIP SECTION IS TOO LONG Carefully cut 1 4 to 3 8 inch from the whip section and re measure Channels 1 20 and 40 If the SWR is still lowest on Channel 1 continue trimming the whip by removing 1 8 to 1 4 inch at a time until ...

Page 15: ...tion has a tendency to loosen it which can cause output transistor problems PERIODICALLY every 6 months re check your SWR Corrosion and road grime may rob you of performance PERIODICALLY check your coaxial cable for wear A broken or loose wire could cause RF output transistor failure This information was produced to help you understand the installation and maintenance of your antenna and cable fee...

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