Stryker SR-440HP User Manual
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INTRODUCTION
Congratulations on your purchase of a Stryker 10 meter mobile amateur transceiver.
Your Stryker is designed to provide years of enjoyment and trouble-free service. There
are many features and functions designed into this transceiver. To ensure that your
investment is enjoyed to its fullest extent, please take a few moments and thoroughly
read this manual.
LIMITED WARRANTY
Stryker Amateur Radio warrants this product to be free of defects for a period of one
(1) year from the original date of purchase. This warranty is non-transferable. This
limited warranty is subject to repair or replacement of defective components only. This
warranty is void if the radio has been tampered with or misused. If your Stryker
Radios needs repair any time during the (1) year warranty period please visit our
website: www.StrykerRadios.com to obtain an RA number or call 910-221-1086 between the hours of 10 a.m. – 5 p.m. eastern standard time. If you do need service
after your warranty has expired you can still send your radio to us for repair. Our rates
are very reasonable and you can rest assured that your radio will be fixed correctly.
IMPORTANT: RETAIN YOUR SALES RECEIPT
You will need to include a copy of your original sales receipt along with your radio
when sending it in for warranty repair.
INSTALLATION
1. Contents
Unpack and inspect your Stryker SR-440HP for missing or damaged
Components.
Quantity Description
1 Stryker SR-440HP Transceiver
1 Microphone
1 DC Power Cord with Inline Fuse
1 Mounting Bracket with Hardware
1 Microphone Hanger with Hardware Set
INSTALLATION CONTINUATION
Location
Plan the location of the transceiver and microphone brackets before starting the
installation. Select a location that is convenient for operation and does not interfere
with the driver or passengers in the vehicle. In automobiles, the transceiver is usually
mounted below the dash panel, with the microphone bracket beside it.
Mounting
Your mobile radio is supplied with a universal mounting bracket. When mounting the
bracket and radio to your car, make sure it is mechanically strong. Also provide a good
electrical connection to the chassis of the vehicle. Proceed as follows to mount the
transceiver:
Mount the Transceiver
After you have determined the most convenient location in your vehicle, hold the mobile radio with the mounting bracket in the exact location desired. If nothing will
Interfere with mounting it in the desired position, remove the thumbscrews and use the
mounting bracket as a template to mark the holes for the mounting screws. Before
drilling the holes, make sure nothing behind the surface will be damaged or interfere
with the installation.
Electrical Connections
The Stryker SR440-HP is designed to work on any 13.8 volt DC, negative ground
electrical source. The condition of a vehicle’s electrical system can have a profound
affect on the performance of the radio. A low battery, worn generator/alternator, or
poor voltage regulator will seriously impair the performance of the transceiver. Any of
the above conditions could result in a high level of receiver noise generation or a
Substantial loss of the transmitter’s RF output. Make sure that all these components
on your vehicle’s electrical system are in good condition prior to installing the
transceiver.
CAUTION! VOLTAGE EXCEEDING 15 Volts DC WILL DAMAGE THE RADIO.
MEASURE VOLTAGE AT BATTERY TERMINALS, WITH VEHICLE RUNNING,
PRIOR TO INSTALLATION!
1. Before making any electrical connections make sure the volume (VOL) control is in
the“OFF” position.
2. Connect the positive (+) red wire of the DC power cord to a positive 13.8-volt
source at the vehicle fuse block. If connecting to the fuse block, it is recommended
that a switched power source be used so that the power to the
Transceiver is disconnected when the vehicle is off. This eliminates the possibility
the transceiver draining the vehicle’s battery.
3. Connect the negative (-) black wire to a metal part of the vehicle’s frame, or
chassis ground. Make sure that this is a good ground connection.
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Antenna Connections
The Stryker SR440-HP has a jack in the rear for a standard PL-259 antenna plug. If
you are looking for the most range for your transmission, use a vertically polarized,
quarter-wave length antenna. If antenna height is a problem, you may use a shorter,
loaded-type whip antenna although you can expect some loss of transmission range.
Your antenna should always be adjusted for the lowest possible SWR (1.5 or less.)
To adjust your antenna for best performance you must use a SWR meter, these can be
purchased separately for at little as $12.95 from various retailers. Failure to properly
adjust your antenna(s) will diminish your operational range and could result in damage
to your radio. Damage that results from operating with high SWRs is not
covered under your factory warranty!
Tuning the Antenna for Optimum SWR
Because such a wide variety of base and mobile antennas are available, this section
will concern itself only with the usual types of mobile adjustable antennas.
Antenna length is directly related to signal frequency. Therefore, it must be
tuned to resonate optimally throughout the frequency range of the transceiver.
Lower frequencies require a longer antenna than higher frequencies.
Due to the various methods of adjusting antennas for proper SWR, we have
chosen what we think is the optimum method:
A. Antennas with adjustable screws (setscrews).
1. Start with the antenna extended and tighten the setscrew lightly enough so
that the antenna can be lightly tapped with your finger for easy adjustment.
2. Set your Stryker radio to your desired operating frequency or the center of
the range of frequencies you plan to use. Press the PTT (Press-To-Talk) switch,
and tap the antenna (making it shorter). The SWR meter will show a lower reading
each time the antenna is tapped. By continuing to shorten the antenna, you will
notice the SWR reading will reach a low point and then start rising again.
This means that you have passed the optimum point for the middle frequency.
3. Extend the antenna a short distance and again follow the procedure above.
4. When the lowest point has been reached, switch to the lowest frequency you plan to
operate on and then to the highest and compare SWR readings. They should be
almost equal.
B. Antennas that must be cut to proper length.
1. Follow the procedure as in A above, but adjust the length
bycuttingin1∕8"incrementsuntilagoodmatchisobtained.
2. Be very careful not to cut too much off the antenna at one time.
Once it is cut, it can no longer be lengthened.
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