If you have trouble with DAB reception in Singapore such as no signal detection, audio output with a lot of "bubble" sound distortion or even poor sound quality, it could likely be due to any one of the following reasons:
- The "bubble" sound distortion is due to corrupted digital audio signal at your DAB radio resulting in error signal. This can happen if there is poor signal reception, interference or a faulty DAB radio.
- There is no DAB antenna connected to your DAB radio or, if there is one, it was not installed properly or may not be designed for VHF Band III reception (174MHz-240MHz).
- Your DAB radio is very far away from our DAB transmitters which are located in the western and eastern part of Singapore.
- The direction of your DAB radio antenna is not facing towards the location of our DAB transmitters in the western or eastern part of Singapore. Terrestrial DAB transmission on VHF Band III works well when there is a clear line-of-sight transmission path between our DAB transmitting antenna and your DAB radio antenna.
- If there is signal blockage caused by any obstacles such as buildings or concrete walls such as in multi-storey and basement carpark, hills, tunnels, and so on. Terrestrial DAB transmission on VHF Band III works better when there is a clear line-of-sight in its transmission path.
- Electro-magnetic interference (EMI) from other radio or telecommunication transmitters or electrical devices.
- The poor sound quality can be due to your DAB radio, hi-fi, audio amplifiers, loudspeakers, cables, connectors, and even the power supply such as the condition of the batteries (if it's a battery-operated device), etc.
For Listeners on DAB Portable Radio or Home Tuner
You will have to do a full tune/scan of DAB channels if you are using your DAB radio for the first time. Please place your DAB radio near to the window or balcony, extend the antenna vertically and adjust the volume control to a suitable level. Press and hold down the "Auto tune" button for a few seconds. You may also select the DAB channels by manual tuning. Please refer to the user guide to learn more about your DAB radio.
- If your DAB radio has a telescopic antenna, fully extend the antenna in the vertical position as shown in Figure 1 below . If the headphone cord doubles up as the antenna, ensure that the cord is fully stretched while listening to the radio as shown in Figure 2 below.
Figure 1. - Photographs showing an example of a DAB portable radio with (A) a fully extended telescopic antenna in a vertical upright position which is recommended, and (B) in a slanting position which is not recommended.
Figure 2. - Photographs showing an example of a DAB handheld radio with headphone cord that is designed to double-up as an antenna with (A) that is fully stretched while listening which is recommended, and (B) with a coiled up headphone cord which is not recommended.
- Move your portable DAB radio to another location in your home that has the fewest large obstacles between your radio and point towards either one of our DAB transmitters location in the western or eastern part of Singapore. Do not connect your DAB radio to the StarHub (formerly SCV) socket.
- There may be electro-magnetic interference (EMI) from other electrical devices such as the power amplifier, digital TV receiver, PC, electrical fans, etc. To check if any of these electrical devices is the cause of the interference, move your portable DAB radio away from the location of these devices or switch-off these devices.
- Connect a wire-loop or T-shaped dipole DAB antenna to the back of your DAB home tuner. Alternatively, you may want to use an active indoor antenna covering VHF band III from 174 - 240 MHz.
Position the indoor antenna until you get a clear signal. Generally, an indoor antenna would not work as well as a roof top outdoor antenna.
- If you live in a landed property, install a roof top DAB radio antenna for the best possible reception. Connect your DAB radio to an existing TV roof top antenna for the next-best alternative. Do not connect your DAB radio to the StarHub (formerly SCV) socket. If in doubt, please check with your Radio/TV antenna contractor.
- Passive (not AC or battery-powered) antennas do not boost signal as much as active antennas. Please check with your DAB radio retailer for more information on the various DAB antenna available.
- Check and ensure that your DAB radio, wiring and connections are in good working condition.
- If necessary, choose a high quality well-shielded RF antenna cable. Please check with your DAB radio retailer for more information on the various RF antenna cable available.
For Listeners on DAB Car Radio
- If you are using a telescopic or whip antenna mounted on the chassis of your vehicle, ensure that it is not blocked as shown in Figure 3. A good way to ensure this is to walk around your vehicle and see if you have a clear line-of-sight of your whip antenna. Generally, a whip antenna mounted on the vehicle chassis would usually have a better reception quality than a glass-mount antenna on your windscreen.
Figure 3. - Photograph showing an example of a recommended mounting position for a DAB telescopic or whip antenna on a vehicle chassis.
- Avoid mounting a telescopic or whip antenna within the cabin of your vehicle as shown in Figure 4 below.
Figure 4. - Photographs showing two examples of a DAB telescopic or whip antenna mounted within cabin of the rear passenger seats of the vehicle at (A) the centre and (B) the left- or right-side of the rear windscreen area which is not recommended.
- If you are using a glass-mount antenna, it is recommended that the flexible antenna rod is in the vertical position for optimal reception as shown in Figure 5 below . It is not recommended to have the flexible antenna rod in the horizontal position. Also, avoid mounting the antenna on the rear window demister as shown in Figure 6 below.
Figure 5. - Photographs showing an example of a DAB glass-mount antenna (A) in the correct mounting position where the flexible antenna rod is in the vertical position on the windscreen within the cabin of the front passenger seat of the vehicle, and (B) where the flexible antenna rod is in the horizontal position which is not recommended.
Figure 6. - Avoid mounting DAB glass-mount antenna near or on the rear window demister as it will severely affect the DAB reception.
- Certain types of UV reflective adhesive film on your windscreen may affect DAB reception. The area of the adhesive film where the glass-mount antenna is located should preferably be removed. Please check with your DAB car radio retailer.
- Ensure that there is no electro-magnetic interference (EMI) from other electrical devices such as the power amplifier, digital TV receiver, etc. To check if any of these electrical devices is causing the interference, move your DAB radio away from the location of these devices or switch-off these devices. Please check with your DAB car radio dealer.
- Noise interference caused by the car engine can be transmitted via the speaker cables to your loudspeakers. If in doubt, please check with your DAB car radio dealer.
- Passive antennas do not boost signal as much as active antennas. Please check with your DAB car radio retailer for more information on the various DAB antenna available.
- Check and ensure that your DAB car radio, the wiring and connections are in good working condition.
- Ensure that there is proper grounding between the chassis of your DAB car radio and the chassis of your vehicle as shown in Figure 7 below.
Figure 7. - Photographs showing an example of a DAB car radio with (A) proper grounding from the chassis of the radio to (B) the chassis of the vehicle.
- If you have installed a DAB car radio, you should install a separate FM antenna for VHF Band II (88MHz-108MHz) FM reception in addition to the antenna for DAB VHF Band III reception (174MHz-240MHz).
- You can enable the auto-switching on your DAB car radio from DAB to FM mode if DAB reception quality decreases severely. This feature is available on some models of DAB car radios. If in doubt, please check with your DAB car radio retailer or refer to the user-manual of your DAB car radio.
- DAB car radios with "DAB-FM-AUTO" setting selected will automatically tune into the FM frequency of the station currently being received if DAB reception quality decreases severely as follows:
|Channel 7B||Channel 7C|
|DAB Station||FM Station||DAB Station||FM Station|
|Ria 89.7FM||Ria 89.7FM||Class 95FM||Class 95FM|
|Y.E.S. 93.3FM||Y.E.S. 93.3FM||Gold 90.5FM||Gold 90.5FM|
|Love 97.2FM||Love 97.2FM||Symphony 92.4FM||Symphony 92.4FM|
|Warna 94.2FM||Warna 94.2FM||987FM||987FM|
|Capital 95.8FM||Capital 95.8FM||Lush 99.5FM||Lush 99.5FM|
|Oli 96.8FM||Oli 96.8FM||938LIVE||938LIVE|
|XFM 96.3FM||XFM 96.3FM|
Please note that the nature of classical music on radio would tend to reveal every little reception flaw while the loud music of pop radio stations would be able to mask the flaw. Therefore, these usually give the wrong impression among our listeners that the transmission quality on Symphony is inferior to that of our other pop stations such as 987FM, Class 95FM, or Y.E.S. 93.3FM and so on.