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Frequently Asked Questions
1. Are Band Expanders all the same?
2. Is Radio filter important?
3. What are Radio Station Double-Ups ?
4. What are Radio Frequency Blank Spots ?
5. Does the Band Expander change the Car Radio Display?
6. What is db Gain in amplification?
7. What is Mhz in bandwith?
8. Can I change the car radio set internally to new FM Band?
9. Is it important to use right aerial leads?
10. Is it important to run Band Expander on 12 Volts?
11. How do I find power connection in car for Band Expander?
12. Is it necessary to shield Band Expander?
13.
Is it important to use quality componentry?
14.
Is it necessary that Band Expander must be assembled in SMD?

15. Why are specifications Important, and knowing which Band Expander works the best?
16. What is shifting option?
17. Can I use more than one Band Expander together to give me a full frequency range?
18. Can I place Band Expander at the aerial or behind the radio?
19. Is there different aerial connection socket?
20. What is diverse sub - aerial and how does it work?
21. Do I need to connect Band Expander to each aerial in diverse aerial system?
22. Can I join both aerial leads together and use one Band Expander?
23. Can the PB1500 Band Expander receive both even and uneven Radio Station ?
24. Does the PB1500 alter the AM Radio Stations ?

1. Are Band Expanders all the same?
No they are not all the same. They may work but there can be or a number of unsatisfactory performance problems. E.G. radio interference, weak signal, inadequate bandwith. ..(top)

2. Is Radio filter important?
It is essential requirement in rejecting unwanted frequencies interfering with the shifted FM Band. Unfortunately most countries frequency range is fully utilized, resulting in large numbers of Communication Equipment operating above and below FM Band. Compromising filter's performance will result in more interference occurring. ..(top)

3. What are Radio Station Double-Ups ?
Common to all FM Band Expanders are Radio Station Double-Ups caused by shifting 20Mhz of bandwidth into 14Mhz of bandwidth ( 88Mhz to108Mhz shifted into 76Mhz to 90MHz ) and overlapping Japanese band FM Band and International FM Band ( 88Mhz to 90Mhz ) eg: Radio Station 105.4Mhz and 95.4Mhz will both tune into the car radio at 85.4Mhz .. ..(top)

4. What are Radio Frequency Blank Spots?
Common to all Band Expanders frequency harmonics generated by Crystal oscillator. Operating well below receiving frequencies producing blank-spots on frequency tuning range. For 10Mhz frequency shift Blank Spots are 90 and 100Mhz for 12Mhz shift they are 96 and 108Mhz for14Mhz shift 98Mhz for 16Mhz shift 96Mhz and 18Mhz shift is 90 and108Mhz...(top)

5. Does the Band Expander change the Car Radio Display?
No the Band Expander does not change the radio’s display, it only changes the original frequency once tuned, program into pre-select memory.. ..(top)

6. What is db Gain in amplification?
Db or decibels ( amplification) is term used to describe levels of amplification in logarithmic scale. Amplification of desired FM Band frequencies must limit conversion gain to prevent car radio's tuner from oscillating. When tuner oscillates, reception is unpredictable. (Amplification must be set to tuners tolerance, not to high or to low.) .. ..(top)

7. What is Mhz in bandwith?
Mhz and bandwith is term again used to describe frequency and amount of frequencies occupied in a given Band range. e.g.. 76-90Mhz Japanese FM Band.. .. ..(top)

8. Can I change the car radio set internally to new FM Band?
Yes there is a small number of sets that can be changed, they require changing the microcontroler's software and or replacing tuner pack. This can be very expensive if parts are available.. ..(top)

9. Is it important to use right aerial leads?
Aerial leads must have an impedance matched to car radio and aerial system. Using a wrong impedance eg.75Ohm cable which is used in some Band Expanders resulting in poor reception. It is also beneficial if the center core is constructed of many copper strands to improve strength and flexibility.. ..(top)

10. Is it important to run Band Expander on 12 Volts?
Band Expander is designed to run on 12 Volts. There are available 24 Volts Band Expanders, also most 24 Volts vehicles have a 24 Volt to 12 Volt converter to run the stereo system... ..(top)

11. How do I find power connection in car for Band Expander?
Power connections . The best way to find 12V is to use a volt meter. (Instead of a light probe) which can cause serious damage to sensitive electronic equipment, and does not give a true reading. It is located behind car radio, electric aerial or fuse box. . . ..(top)

12. Is it necessary to shield Band Expander?
Shielding stops any potential engine noise. This is why Our Band Expanders are housed in a metal box enclosure... ..(top)

13. Is it important to use quality componentry?
Obviously you must manufacture units with best possible components if not there will always be a problem with inferior componentry. . ..(top)

14. Is it necessary that Band Expander must be assembled in SMD?
No it is not necessary, infect it will be pretty much the some as through hole components at FM Band frequencies? It is more selling point to talk about... ..(top)

15. Why are specifications Important, and knowing which Band Expander works the best?

Without accurate test specifications You would have to manually test Band Expander in every extreme situation to find if it performs satisfactory level required.. . ..(top)

16. What is shifting option?

Shifting option enables you to move FM International Band to Japanese FM Band in options of 10, 12, 14, 16, 18 Mhz... ..(top)

17. Can I use more than one Band Expander together to give me a full frequency range?

No. It would result in poor reception. . ..(top)

18. Can I place Band Expander at the aerial or behind the radio?
Yes, Band Expander can be placed anywhere between aerial and car radio set... . ..(top)

19. Is there different aerial connection socket?
Yes, Please see our accessory page.. ..(top)

20. What is diverse sub - aerial and how does it work?
Diverse Aerial Systems consist of a two aerials main and sub aerial. Diverse Aerial Systems are very popular in most up-market Japanese Vehicles and Car Manufacturers, who want to provide the "Best" radio reception possible. More information can be found HERE. . ..(top)

21. Do I need to connect Band Expander to each aerial in diverse aerial system?
If your vehicle is fitted with a Diversity Antenna System connect the Band Expander to the main aerial and disconnect the sub-aerial. But we recommend fitting a Band Expander on each aerial input, as the sub-aerial is designed to operate when the transmitter signal is to strong for the radio input. ..(top)

22. Can I join both aerial leads together and use one Band Expander?
No, this will effect aerial parameters resulting in poor receptiont. . ..(top)

23. Can the PB1500 Band Expander receive both even and uneven Radio Station ?
No you will only receive the Even Radio Band. the Band Expander shifts the whole radio band 0.01Mhz so that the it can tune the radio stations that it could not previously receive. . . ..(top)

24. Does the PB1500 alter the AM Radio Stations ?
No unfortunately the AM is bypassed without change, it is to difficult to shift the 10Khz steppings into the 9Khz steppings. . . ..(top)

 
 
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