    
Tech808
Moderator
Username: Tech808
Post Number: 17080
Registered: 8-2002
| | Posted on Sunday, August 16, 2009 - 7:02 pm: | 
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AT - KW1
NO GROUND
CB ANTENNA TUNER
Installation and Operation Instructions
The RF Limited AT-KW1 No Ground Antenna Tuner will eliminate a very wide range of standing wave's, including 10:1 or more.
Why is this important?
A standing wave can reduce talk range up to 50%. A standing wave of 3:1 can reduce talk range up to 23%. The AT-KW1 eliminate's these high VSWR situation's and increase's your talk range.
FEATURES:
* Maximizes transmitted signal by reducing reflected power, resulting in longer range.
* Insertion loss of less than 1/4 watt.
* Can be used with or without a lininear amplifier.
* Will handle up to 1,000 watts peak power without signal degradation.
* Reduces stress on transmitter, prolonging the life of your radio.
* Compatible with any antenna system ~ single or dual antennas.
* Does NOT need additional ground wires.
INSTALLATION:
#1 ~ Find a suitable location as close to the output of the radio or linear amplifier as practical. Keep the coax cables between the AT-KW1 and radio or amplifier as short as possible, without making the installation difficulate.
#2 ~ Secure AT-KW1 to either a metal or plastic wall with screw's (Not Provided).
#3 ~ Connect as shown in Figure 2, 3, or 4 (depenmding on your system).
#4 ~ Perform the Tuning procedure as described below.
TUNING PROCEDURE:
#1 ~ Establish Reference Power Measurement
a. ~ Connect as shown in Figure 1.
b. ~ For this procedure, do NOT have the AT-KW1 or liearnamplifier (if used) installed in line.
c. ~ Install a SWR / Wattmeter Meter inline as shown in Figure 1.
d. ~ Make sure radio is set to AM mode.
e. ~ Measure and Record the power out (average power) while transmitting with with NO modulation.
f. ~ This is the "reference power". SAVE thuis number for later use.
#2 ~ Next install the AT-KW1 and SWR/Wattmeter inline, refer to Figure 2 and 3. NOTE: If using a linear amplifier perform tuning procedure using Figure 2. Install amplifier after tuning using figure 2. Install amplifier after tuning as shown in Figure 4.
#3 ~ Turn on the radio and set the SWR/Wattmeter to measure forward RF watts.
IMPORTANT!
A non-metallic screwdriver is supplied with the AT-KW1. Any adjustmemts to C1 or C2 must be done using this or any NON-METALLIC tool. FAILURE TO DO THIS MAY RESULT IN CATASTROPHIC FAILURE OF THE TRANSMITTER AND IS NOT COVERED UNDER ANY WARRANTY!
#4 ~ Press and hold the PTT switch, and adjust C1 on the AT-KW1 (Figure 5) until the SWR the SWR/Wattmeter is set to the "regerence power" measurement.
#5 ~ Switch the SWR/Wattmeter to calibrate or set, mode.
#6 ~ Press and hold the PTT switch, and adjust the SWR/Wattmeter to calibrate or set, point.
#7 ~ Switch the SWR/Wattmeter to SWR position.
#8 ~ Press and hold the PTT switch and observe the standing wave, while adjusting C2 on the AT-KW1 to minimum reading. You should be able to adjust the standing wave to 1:1 to 1.
#9 ~ Double check your work by repeating steps 5 and 6. Then switch the SWR/Wattmeter to the the SWR position and press the PTT switch. If everything was done correctly, the standing wave will be 1:1.
#10 ~ Tuning complete! Remove wattmeter and connect as required.
FIGURE #1
Reference Power Meter.
RADIO ® SWR/Wattmeter ® 50-Ohm Load
FIGURE #2
Standaerd Setup
(Without Linear Amplifier)
RADIO ® AT-KW1 ® ANTENNA
Insert Inline SWR/Watt Meter
between Radio & AT-KW1
FIGURE #3
Setup with Co-Phased Antennas
Radio ® AT-KW1 ®
Co-Phased Splitter ®
Left Antenna & Right Antenna
FIGURE #4
Setup with Linear Amplifiers
Radio ®
Linear Amplifier ®
AT-KW1
NOTE! FINISHED!
Lon~Tech808
N9CEF
CEF#808~CVC#002
Radio Enthusiast!
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