※下の報告は、02年5月から6月にかけて、Kodbins Ltdによって行われたテスト結果の概要です。 |
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Internal Antenna The following pages are from a much larger report
carried out for Kodbins Ltd during May and June 2002. CONTROL
ENVIRONMENT - Various indoor concrete buildings with no windows within 35
feet of the cellular phone unit. Criteria for these experimental locations
include low or null signal without the internal antenna installed. Tests
conducted for indoor functionality of the internal antenna spanned over a
period of time of no less than a couple of months. The rationale for the time
frame is because cellular sites of various service providers may be
overloaded at different times of the day and different days of the week. The
few months time frame also rules out the possibility of a cell site being
down or under maintenance. RESULTS -
It found that the internal antenna helped most of the phones gain roughly one
bar of signal strength. In certain cases where the concrete area was
underground, the antenna did not noticeably increase the cellular phone's
signal. In metropolitan areas such as Downtown Los Angeles, San Francisco and
New York, the internal antenna not only increased the signal strength, but
actually helped older analog phones reduce static to the point where the
testers say they can carry on a conversation without having to repeat themselves
to the other party. It was
reported that this was not possible before the internal antenna was
installed. Consistency is the key factor in TEST I. There were times when
certain cell sites were down, and lack of signal affected everyone with the
same cellular carrier, regardless if they had the internal antenna installed
or not.
TEST
EQUIPMENT - For this, consultation with an Electrical Engineer from the The
following is an excerpt from William Angle, Engineer, of the independent "Each
of our tests (for the Power Strip Antenna Booster) was conducted in city "We
have found that transmission and reception quality was improved up to 30%. "Various
terrain did effect overall performance, however, there was still a 15%-25%
average improvement. "The
biggest improvement was the decrease in lost calls or drop-outs… ” The next
set of tests was accomplished by Joseph W. Fink Ph.D., Mechanical Engineer I
completed the following test on the Internal antenna booster under standard
guidelines for cellular phone testing. Two identical phones were used for
each test. Different brands of phones were used to justify the test results
as well as PDA’s and other cellular devices.
The testing
Phones used were Nokia, Nextel, Ericsson and Motorola. The two Nokia phones
used for the testing were GMS phones. The PDA’s used in the tests were Palm
7x and used to validate data as well as voice signal improvements.
The
Phones were Testes in the Las Vegas Area Inside buildings and at least 35
feet from a window. Some of the tests were done in the Casinos on the Las
Vegas strip including Caesars Palace and The Monte Carlo Hotel and Casino. The tests
were all under control conditions and completed by engineers working under
the direction of Dr. Fink. The areas were tested over a period of 28 days to
exclude low service due to congested sites or cell sites being maintained
during our tests. The tests were also preformed at non-regular intervals to
help protect the test results as valid.
An
average of a 20% increase of was found on the cell phones and 25% on the
PDA’s. The results were found to be with in the normal standard for this type
of device. The thin film Antenna booster is a good product and receives high
marks for meeting its marketing claims. The largest improvement we found was
the greatly reduced incident of dropped calls from the cell phones and much
improved signal strength on the PDA’s.
PDA’s and
home cordless phones were also thought to have an increase in reception and
transmission from the Internal antenna. We decide to put them to the test and
see what happened. Cell phones and home cordless phones have a lot in common.
They’re both transceivers and both radio devices. The home cordless phone is
a much less complicated device and the phones tested were in the low end of
the band at 2 Ghz. The phones showed not only increased range but also less
static.
The
Internal Antenna did prove to help in this Technology as well.
The
Internal Antenna is not only a good product that works; it is based on solid
tried and true technology. It has no parts to wear out or take up a large
area outside of the phone.
Joseph W.
Fink, Ph.D.
Angle,
William, Engineer. Excerpts and test results from the independent testing
laboratories of Image Electronics, FOLLOWING
TRIALS AND FEEDBACK FROM TEST GROUPS, A NUMBER OF STATEMENTS FROM
USERS HAVE BEEN LAID OUT BELOW. Customers have
reported betterperformance if the phone is not held too firmly and supported
with two fingers. This helps to reduce the effect of interference from the
hand contact with the phone. Performance
appears to be enhanced with a fully charged battery. The signal may
not be evident but the phone may still call out once the send button is
pushed assuming there is still a weak signal. Clarity of call is enhanced even in weak signal areas even given
a low signal bar . The call may be improved by turning to account
for the directional nature of the signal being received. Customers have
reported being able to receive calls where they historically have been unable
to in the past... |
