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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).

Start with the antenna extended and tighten the setscrew lightly 

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enough so that the antenna can be lightly tapped with your finger for 

easy adjustment.

Set your Stryker radio to your desired operating frequency or the 

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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.
Extend the antenna a short distance and again follow the procedure 

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above.

When the lowest point has been reached, switch to the lowest 

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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.

Follow the procedure as in A above, but adjust the length by cutting 

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in 1∕8" increments until a good match is obtained.

Be very careful not to cut too much off the antenna at one time.

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Once it is cut, it can no longer be lengthened.
The whip is easily cut by filing a notch all the way around, then 

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breaking the piece off with pliers.

NOTE:

The proper setting is achieved when the SWR is 1.5 or below and when it has 

the same reading for the low and high frequencies in the range you plan to use.

External Speaker

The  external  speaker  jack  (EXT)  on  the  rear  panel  is  used  for 

remote receiver monitoring. The external speaker should have 8 ohms 

impedance and be able to handle at least four watts. When the external 

speaker is plugged in, the internal speaker is disabled.

Programming Jack

Using this jack and the supplied USB preprogramming cable you 

can  change  many  of  the  default  options  that  your  radio  has.  Our 

programming software has easy to follow on screen instructions for 

making these changes. Our programming software is available for 

download via our website.

Public Address

To use the transceiver as a public address system, connect an external 

8 ohm speaker that is able to handle at least four watts to the PA jack on 

the rear panel. Direct the speaker away from the microphone to prevent 

acoustic feedback. Physical separation or isolation of the microphone 

and speaker is important when operating the PA at high output levels.

Improper Radio Adjustments

Service by unqualified technicians could result in damage to your 

radio. Never allow anyone to disable your radio’s modulation limiting 

circuitry.  We  have  designed  your  radio  for  optimal  performance 

and durability. Disabling this circuitry could damage your radio and 

potentially void your factory warranty!

For further service information please visit www.StrykerRadios.com.

Operating Guide 

FUNC: 

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Pressing this button in for approximately three seconds allows 

you to access the function menu.

Summary of Contents for SR-955HPC

Page 1: ......

Page 2: ...kerradios com register aspx 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 3 year warranty period please visit our website www StrykerRadios com to obtain an RA number or call 910 221 1086 between the ...

Page 3: ...e 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 installi...

Page 4: ...areful not to cut too much off the antenna at one time 222 Once it is cut it can no longer be lengthened The whip is easily cut by filing a notch all the way around then 333 breaking the piece off with pliers NOTE The proper setting is achieved when the SWR is 1 5 or below and when it has the same reading for the low and high frequencies in the range you plan to use External Speaker The external s...

Page 5: ...e channel display indicates the currently selected channel Echo 1111 The Echo switch turn the echo on A big advantage to this is you can turn it off and then back on with the switch without the need to adjust your volume delay potentiometer To turn the echo off simply move the switch to the middle position Color 1111 Pressing this button changes the color of the front panel and display Each time i...

Page 6: ...To increase the echo volume rotate the control clockwise Echo Delay 2222 The Echo switch turn the echo on A big advantage to this is you can turn it off and then back on with the switch without the need to adjust your volume delay potentiometer To turn the echo off simply move the switch to the middle position Fin 2222 This is the fine control for the clarifier Please refer to the function menu se...

Page 7: ...1 Channel Scan Button 1111 Band Mode Switch 1111 Microphone Jack 1111 VFO Mode Switch 1111 Receiver Volume 1111 Receiver Squelch 1111 Microphone Gain 2222 RF Gain 2222 Noise Blanker ANL 2222 Echo Volume 2222 Echo Delay 2222 Fine Clarifier Adjustment 2222 Coarse Clarifier Adjustment 2222 Channel Selector 2222 13 14 15 16 1 2 3 4 5 6 7 8 9 10 11 12 17 18 19 20 21 22 23 24 25 26 27 FUNC SCAN COLOR SR...

Page 8: ... user should select a low impedance dynamic type microphone or a transistorized microphone Transistorized type microphones have low output impedance characteristics The microphones must be provided with a four lead cable The audio conductor and its shielded lead comprise two of the leads The third lead is for transmit control and fourth is for receiving control The microphone should provide the fu...

Page 9: ...he default setting for this is on but many user may wish to turn this off as well This function basically emits an audible beep when a feature is turned on or off for example moving the NB switch to NB position TOT This menu is used to set transmitting limit time When pressing PTT key at a single time longer than the due time setup in advance the radio would stop transmitting automatically and the...

Page 10: ...on again will add your current channel to the list of channels to be scanned when the scan feature is activated To delete a channel from the scan list do the following When Scan Add is display on the meter rotate the channel selector once to the right and Scan Del will be displayed Press the FUNC button and this channel will now be deleted from the scan list RB This function lets you choose from a...

Page 11: ...A2 0 12 11 ...

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