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I installed a uniden 400sx with a 900mm high ground dependent aerial everything is connected i have power but when i transmit there is no transmission or response thanks.

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Check the unit is not on a VOX setting (voice operated microphone). If it is usually the display will have in small digits vox displayed, and you need to take it out of this mode for normal operation. If this is ok it may be a fault with the unit, and so you would have to take it back to place of purchase for repair or replacement.

Posted on Sep 21, 2009

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When and How Should a Surge Protector Be Used on a Fixed Switch?


Common Causes of Lightning Strikes
  • Outdoor network cables or power cables are routed overhead.
  • A switch is deployed outdoors but is not properly grounded.

Damages of Lightning Strikes
  • If power cables of a switch are routed overhead in an outdoor environment, lightning strikes may burn the power supplies.
  • If network cables of a switch are routed overhead in an outdoor environment, lightning strikes may burn interfaces of the switch.
When a switch undergoes lightning strikes, overvoltage is induced by lightning on network cables and transmitted to interior of the chassis. The surge protection measures, such as lightning rod and chassis grounding cannot prevent the damage. Therefore, surge protectors or surge protection circuits are recommended.

Surge Protector Use Precautions Take the following precautions to protect a switch from lightning:
  • Ensure that the ground cable is connected to a ground bar or a ground point on the cabinet.
  • Avoid routing cables overhead in an outdoor environment. Bury cables underground or route them in steel tubes.
  • To protect network interfaces against lightning, use 8-line surge protectors (or Huawei certified 4-line surge protectors).
  • When installing a network interface surge protector, connect the IN end to terminals and the OUT end to network interfaces of the switch.
If a fixed switch is installed in a network box, follow these instructions:
  • Connect the ground cables of the switch and surge protectors to the ground bar in the network box.
  • The maximum length of a ground cable cannot exceed 40 cm, and a length of smaller than 15 cm is recommended.
  • If the network box is located outdoors and power cables are routed aerially over a long distance (more than 300 m) to the network box, it is recommended that you install a power supply surge protector in the network box. The decoupled power cable must be at least 3 m long
S2300 Switch Thunder link com

Dec 08, 2016 | Office Equipment & Supplies

1 Answer

Why my uniden has no squech or sound but transmits


Hi



Although this question is an old one, I\'ll do my best to answer it in case someone else has the same issue. This is condition is nearly always caused by a cabling problem usually where the antenna connects to the radio. Carefully inspect the connector for obvious damage, clean the connection with silicone spray (safe for plastics) and reconnect the antenna several times. While you\'re at it, check and clean the power connections as well, both at the radio and the battery/power panel connections as the problem could be as simple as a poor ground.



This problem could also be the fault of a broken wire/poor solder joint in the PL-259 plug itself. If you\'re handy with a soldering iron, take the connector apart and make sure the centre pin connection is securely soldered as well as the ground braid soldered securely to the case of the PL-259. I\'ve included the link to Uniden\'s marine electronics owner\'s manuals and the support page. I\'ve had pretty good luck in the past when I\'ve had to contact Uniden.



Hope this helps.

-Steve







scat=marineelectronics_mnl">Select Product Category







Marine Radios

Aug 26, 2014 | Uniden Solara DSC VHF Marine Radio

1 Answer

My Klh r3000 receiver is great for everything except picking up am or fm stations? I had an antenna attached, but the unit is in my basement, and I get no signals at all. What could I be doing wrong?


If the antenna is in a basement that is the problem - the fact that it is below ground means that no signals can get through.
Radio signals are blocked by buildings, large lumps of metal or other solid objects as well as strong magnetic fields (which can include electrical devices within the home).
To pick up good radio reception you will need an external antenna above the ground level - preferably as high as you can get it. Unless you get an omni-directional antenna like this one http://www.maplin.co.uk/vhf-fm-omnidirectional-aerial-874 you will need to point the antenna accurately at the transmitting station (+ or - about 5 degrees) for FM. At a pinch you might get by with an indoor aerial but it needs to be above ground level (inside a roof would be best)
Good external AM Radio aerials are harder to find these days.

Feb 24, 2011 | KLH R3100 Receiver

1 Answer

Here's a good one for an expert. Our newish coastguard boat fitted with 3 VHF radios - all working correctly, recently had a wireless headset system installed. We get huge amounts of electrical nosie over...


From your info the GND & shield (could be the same) are crossed. or one is open. A shield as in the antenna coax or an isolated ground as in an internal type coax in the interconnect cable of the wireless headset assembly. I suggest doing a 'BOARD WALK' routine, Move the wireless assy from one VHF unit to another, the problem follows-bad head set assy. If not, return to original VHF, problem returns bad internal connection in VHF unit. Please let me know the outcome.

Oct 06, 2010 | Uniden Solara DSC VHF Marine Radio

1 Answer

Pc78elite won t transmit but receive is ok


Have the SWR's ever been checked on this radio when it was installed? where they over 2 or higher?

Most likely the final transmit transistor is bad from too high of an SWR.


Feb 22, 2010 | Uniden PC78ELITE 40-Channels Base CB Radio

2 Answers

Im installing a west marine vhf500sc on my tugboat. I have all the power, ground, and antenna hooked up properly but yet it still wont produce power. What should i do...


try replacing the microphone, some radios will not even show power with a faulty microphone. also, check that you have power to the hot wire and the ground is grounded by use of a multi-meter.

Jan 07, 2010 | Radio Communications

2 Answers

My swr is too high, was 1:1 WHEN I INSTALLED 2 WEEKS AGO


Something has changed in your system. Check all of your connections and grounds. Thats where I would start.

Jul 05, 2009 | Superstar SS-3900EGHPA CB Radio

1 Answer

Power cuts in and out when transmitting or receiving


Here are some things that could be wrong and some solutions.

Check the fuse.

The power jack could be bad.

Where is it hooked to power? It could either have a bad ground, or in sufficient power from that source. Try connecting it direct to the battery.


May 01, 2009 | Uniden Radio Communications

1 Answer

I have a CXSGT08HP sony car stereo. It was installed by a friend at home. The memory does not work. Can you tell me which wire is the memory wire and were i need to hook it up to?


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I’m attaching a wiring diagram which hopefully isreadable. I’ll also list the “where to”instructions for all of the other wires. It’simportant that several wiring steps be done in a particular order.

About the Memory Wire:

The memory wire is Yellow and should be connected to the +12 V power terminal (which isenergized at all times). First besure to connect the black ground (earth) lead to a metal surface of the car.

Important…
>>Before making connections, turn the stereo unit and carignition off to avoid short circuits.
>>Connect the yellow and red power input leads onlyafter all other leads have been connected.
>>The power antenna (aerial) control lead (blue)supplies +12 V DC when you turn on the tuner.


Hope this helps. Lemme know if you have more questions or would like me to email you acopy of the owner’s manual.

Thanks, and take care.

Gail :-)
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Connecting the Sony CXS-GT08HP Car Stereo Unit

1. To a metal surface of the car
>First connect the black ground (earth) lead, thenconnect the yellow and red power supply leads.

2. To the power antenna (aerial) control lead orpower supply lead of antenna (aerial) booster amplifier
>Notes
>>It is not necessary to connect this lead if there isno power antenna (aerial) or antenna (aerial) booster, or with a manually-operatedtelescopic antenna (aerial).
>>When your car has a built-in FM/AM antenna (aerial)in the rear/side glass, see “Notes on the control and power supply leads.”

3. To AMP REMOTE IN of an optional power amplifier
>This connection is only for amplifiers. Connecting anyother system may damage the unit.

4. To the +12 V power terminal which isenergized in the accessory position of the ignition switch
>Notes
>>If there is no accessory position, connect to the+12 V power (battery) terminal which is energized at all times.
>>Be sure to connect the black ground (earth) lead toa metal surface of the car first.
>>When your car has a built-in FM/AM antenna (aerial)in the rear/side glass, see “Notes on the control and power supply leads.”

5. To the +12 V power terminal which isenergized at all times
>Be sure to connect the black ground (earth) lead to ametal surface of the car first.

Important…
>>Before making connections, turn the car ignition offto avoid short circuits.
>>Connect the yellow and red power input leads onlyafter all other leads have been connected.
>>The power antenna (aerial) control lead (blue)supplies +12 V DC when you turn on the tuner.
>>When your car has built-in FM/AM antenna (aerial) inthe rear/side glass, connect the power antenna (aerial) control lead (blue) or theaccessory power supply lead (red) to the power terminal of the existing antenna(aerial) booster. For details, consult your dealer.
>>A power antenna (aerial) without a relay box cannotbe used with this unit.

Nov 29, 2008 | Car Audio & Video

1 Answer

Mic hum


Yes, the wiring is different. Reverse the wires on pins 1 & 2, then reverse the wires on pins 3 & 4.

The wiring for you radio's mike is:

1- Audio
2-Ground (Shield)
3-Receive
4-Transmit

Depending on the vintage of your mike, the colors Uniden uses for these functions are white or yellow for audio, red is transmit & black is receive.

Jul 31, 2008 | Superstar SS-121 120-Channels Base CB...

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