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Leixen  LX-928
 
FAQs Page
 
             
 
1.
   
Newest Radio and Firmware
1.1   The Newest Version of the LX-928
  1.2   Firmware updates
  1.3   LX-928 vs. LX-928S
 
2.
   
Transmitter and Receiver
  2.1   I can't hear my local repeater (CTCSS)
  2.2   I can't hear my signal, but I hear the repeater squelch tail
  2.3   Aircraft frequencies
  2.4   Weather frequencies - NOAA / NWS
 
3.
   
Programming
  3.1   Disabling the transmitter for receive only frequencies (NOAA)
  3.2   Storing FM radio 65-108MHz channels in memory
 
4.
   
Tone Access  (CTCSS, DCS, DTMF)
  4.1   CTCSS / DCS tones - What are they
  4.2   How do I send a 1750 Hz tone
 
5.
   
Batteries and Accessories
  5.1   Cables, antennas, Spkr/Micr interchangeability
  5.2   Is a radio case a good purchase
 
6.
   
Software, Cables & Drivers
  6.1   Software selection
  6.2   Error Messages
  6.3   Programming Cable & Drivers
  6.4   Genuine Programming Cable
  6.5   Building Your Own Programming Cable
 
7.
   
Microphone and Audio issues
  7.1   No Transmit Audio
  7.2   Low Transmit Audio
  7.3   Less Microphone Sensitivity
  7.4   PTT disabled when Spkr/Micr plugged in
 
8.
   
Antenna Questions
  8.1   Which antenna is best
  8.2   SMA Antenna Connectors
  8.3   Antenna doesn't screw in completely
 
9.
   
Display Questions
  9.1   LCD turns dark
  9.2   Display disappears if I wear sunglasses
 
10.
   
General Questions
  10.1   Waterproof / IPX rating
  10.2   Radio shuts down
  10.3   Did I get a used radio
  10.4   Keypad is Locked
  10.5   User Manual
       
       
     
       
Newest Radio and Firmware 
 
  1.1   The Newest Version of the LX-928
Using the factory software
     Select Program / Read from Radio
     Select Program / Radio Information
 
Factory Time will show the build Date and Time for the radio.
 
 
  1.2   Firmware Updates
The firmware cannot be updated.
The microcontroller is an OTP (One Time Programmable)
Once 'flash' programmed at the factory, it cannot be changed.
 
 
  1.3   Difference between LX-928 and LX-928S
The 928S includes:
- DTMF encoding and DTMF decoding
- PTT ID (Voice broadcast PTT ID)
- All calls, group calls and selective calls
- RX Inhibit, RXTX Inhibit
 
       
Transmitter and Receiver
 
  2.1   I can't hear my local repeater (CTCSS)
Some Repeaters and Services require a CTCSS of DCS tone for access but DO NOT transmit one back. If your display indicates there is an incoming signal but you hear no audio, you may have an incorrect or unnecessary RX tone set. This can be tested by pressing the [MONI] button of the side of the radio. When in doubt, leave the CTCSS or DCS tones set to OFF.
 
 
  2.2   I can't hear my signal, but I hear the repeater squelch tail
The key here is that you can hear the repeater squelch tail.
You are too close to your receiver and over powering (de-sensing) it.
When this happens, you are blocking everything from your monitor.

1) Listen to your signal on simplex to verify you have audio.
2) Call someone on the repeater to verify your signal quality. If they can hear you, then all is fine.
3) For testing using repeater frequencies, always set your monitor receiver to your transmitter's frequency, not the repeater's output signal.
 
 
  2.3   Can I receive Aircraft frequencies
No. They are out of the radio's frequency range.
Also, the Aircraft Band is AM while the UV5R is FM only
 
 
  2.4   Can I receive Weather channels - NOAA / NWS
Yes. However, it cannot be put in a standby mode and triggered by their 1050Hz alert tone.
 
 
       
Programming
 
  3.1   Disabling the transmitter for receive only frequencies (NOAA)
This can be done using the transmit inhibit function of your software.
 
 
  3.2   Storing FM radio 87.5-108MHz channels in memory
This radio can store up to 30 FM Broadcast channels in memory.
You also cannot make this radio transmit on this band.
 
 
       
Tone Access (CTCSS, DCS, DTMF)
 
  4.1   What are CTCSS (PL) tones
A CTCSS is an 'Tone' sent along with your voice when transmitting.
They are used to access a specific repeater and block interference.
     Visit CTCSS for details.

 
  4.2   How do I send a 1750 Hz tone
This is a User Defined Key Option.
The 1750Hz shortcut will transmit a 1750Hz burst tone when pressed.
 
  
       
Batteries and Accessories
 
  5.1   Cables, antennas, Spkr/Micr interchangeability
Many Kenwood / Wouxun accessories are, such Spkr/Micr, etc.
 
 
  5.2   Is a radio case a good purchase
If you carry your radio and keys in the same pocket, yes.
See Radio Shutdown under General Questions below.
 
 
       
Software, Cables & Drivers
 
  6.1   Software selection
Factory Software - Usually included with the radio  FactorySW
 
 
  6.2   Error Messages
There are several  common error messages that could appear
when programming via software.  A list of these error messages, their definition and recovery can be found at Error Messages.
 
 
  6.3   Programming Cable / Drivers
This is one of the major frustrations with generic, low cost programming cables. Many generic cables use Prolific chip clones/copies. When plugged into a USB slot, Windows will load the latest driver. These drivers have been updated to reject cables using cloned chips.
 
These cables will work fine, but only if the proper backdated driver is installed. This is covered in detail in the USB Cable Drivers page.
 
 
  6.4   Genuine Programming Cable
Programming cables utilizing an FTDI chip will work with no problems. These cables are truly "Plug 'n Play". Call your local dealer before ordering to confirm chip set.
 
 
  6.5   Building Your Own Programming Cable
Another option is to build your own programming cable.
The Diagrams and Procedures can be found at:

USB to 2 Pin   -   Baofeng / Kenwood
USB to RJ-45   -   Leixen
RS232 to 2 Pin  -  Baofeng / Kenwood
General Technical Information
 
 
       
Microphone and Audio Issues
 
  7.1   No Transmit Audio
First, confirm you have no TX audio by listening to your signal on Simplex. If you experience no audio, the microphone jack might be stuck open with debris. Trim a Q-Tip to fit the microphone jack opening and dampen with denatured alcohol to clean the jack contacts. Allow ample time to dry.
 
 
  7.2   Low Transmit Audio
Here's are some suggestions:
1) Talk directly into the radio, within one inch.
2) Try an external spkr/mic to confirm problem is the mic.
3) Blow compressed air into the spkr/mic jack.
4) If you have an external spkr/mic, plug it in and out a few times. The issue might be a dirty connector.
5) Ham Bands Only - Set to Wide Band.  5 kHz (Menu 5=W)

Note: Some have reported the need to open up the microphone hole in the plastic case. This can be done by CAREFULLY using a 3/64" drill bit and twisting it slowly by hand to clear out the opening, but avoid touching the microphone element. There is approx 1/16" clearance between the inside of the case and the microphone element.
 
 
  7.3   Less Microphone Sensitivity
Unlike Ham equipment, many of these radios were designed for commercial use. This was to block out background noise in an industrial environment. Talking right into the face of the radio cures most audio weakness.
 
Do not confuse the audio of a handheld with that of a smart phone that can hear a pin drop in the next room.
 
 
  7.4   Is PTT disabled when Spkr/Micr plugged in
No. Even with a Spkr/Mic plugged in, the PTT switch is still physically connected. This is true for most handhelds.
 
 
       
Antenna Questions
 
  8.1   Which antenna is best?
It's all personal preference, but a good rule of thumb is:
The longer the radiator, the better the range, especially on transmit. Short stubby antennas use a coil to match TX to 50 ohm, not radiate. The closer to 1/4 wavelength in the air, the better the performance.

Field test results performed between 31 popular antennas can be found at  Field Tests.
 
An overview of antenna types available can be found at Best Antenna.
 
 
  8.2   SMA Antenna Connectors
There are several varieties of SMA connector. Male, Female, Reverse Polarity, etc. For diagrams of these varieties, go to SMA Antenna
 
 
  8.3   Antenna doesn't screw in completely
This is not uncommon on some aftermarket antennas. If your antenna doesn't come with a rubber spacer to fill the gap, you can purchase a thin 5/8" OD rubber O-Ring. Take your HT with you to the hardware store to assure the proper fit. Additional information can be found at Extended Threads
 
       
Display Questions
 
  9.1   LCD turns dark
This is to be expected from a small radio. 5 watts creates a lot of heat in a small unvented area. The same occurs if you leave the unit in the car on a hot day. Run low power whenever possible. This will also extend battery life.
 
 
  9.2   Display disappears if I wear sunglasses
LCDs function by polarizing the liquid crystal elements in the display. Polarized sunglasses will react to the polarized lens. LCD Wiki
 
       
General Questions
 
  10.1   Waterproof / IPX rating
The IPX Code classifies and rates the degree of protection against water provided by a case or electrical enclosure.

This list ranges from IPX0 to IPX8.
- IPX0 = No Special Protection  to
- IPX7 = Protected against water immersion for 30 minutes at a depth of 1 meter.
- IPX8 = Protected against water submersion - The equipment is suitable for continual submersion in water under conditions which are identified by the manufacturer.

A detailed breakdown of these codes can be found at CODES.
 
  10.2   Radio shuts down
A case is recommended if you carry your radio and keys in the same pocket.  If the charging contacts are shorted, the battery goes into the protection mode. There will be no damage to the radio, but it will power off. To reset the protection mode, the battery must be removed and reinserted.
 
Note: If you carry a spare battery, place it in a small plastic bag for protection.
 
 
  10.3   Did I get a used radio
Many of these radios to come with some channels pre-programmed. These are channels used for factory testing.
 
 
  10.4   Locking / Unlocking the Keypad
Hold the  Menu key in for approximately 3 seconds.
Pressing it quickly will select the Menu options.
 
 
  10.5   User Manual
The User Manual available at: User Manual
 
 
       

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