| Frequently
Asked Questions |
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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) |
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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) |
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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) |
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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) |
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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) |
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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) |
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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) |
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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) |
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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) |
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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) |
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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) |
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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) |
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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) |
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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) |
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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) |
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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) |
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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) |
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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) |
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19.
Is there different aerial connection socket?
Yes, Please see our
accessory page.. ..(top) |
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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) |
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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) |
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22. Can I join
both aerial leads together and use one Band
Expander?
No, this will effect
aerial parameters resulting in poor receptiont.
. ..(top) |
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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) |
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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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