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Page 4

FRONT PANEL DESCRIPTION

1. 

POWER/SWR METER

 Dual needle meter displays FORWARD and 

REFLECTED power in watts. SWR is measured where the two needles 

intersect on the red scale. SWR is printed on meter face.

2. 

PEAK HOLD

 Select to read Peak Hold on the SWR meter. Peak switch [3] 

must be in PEAK position.

3. 

PEAK

 Selects between PEAK and AVERAGE power metering display.

4. 

RANGE

 Two-position switch selects the range of FORWARD and 

REFLECTED power displayed on the power meter. When the RANGE 

button is OUT, the FORWARD meter scale reads 300 watts full scale and 

the REFLECTED meter scale reads 60 watts full scale. When the RANGE 

button is IN, the FORWARD meter scale reads 3000 watts full scale and 

the REFLECTED meter scale reads 600 watts full scale.

5. 

ON

 Select to turn on the backlight in the meter and enable metering, 

and 160 meter functions. The jack on the back panel must be supplied 

with 12 VDC for these functions to work.

6. 

DIRECT-TUNED MODE SWITCH 

Six-position rotary switch selects an 

output connector as follows:

1

2 3 4 5

PALSTAR

6

7 8

9

 a. 

DIRECT BYPASS

 selects BYPASS COAX CONNECTOR bypassing the 

impedance matching circuit, but providing SWR, FORWARD, and 

REFLECTED power meter readings.

 

 b. 

DIRECT COAX 1

 selects COAX 1 CONNECTOR bypassing the tuner 

matching circuit, but providing SWR, FORWARD, and REFLECTED meter 

readings.

 c. 

DIRECT COAX 2

 selects COAX 2 CONNECTOR bypassing the tuner 

matching circuit, but providing SWR, FORWARD, and REFLECTED meter 

readings.

 d. 

TUNED COAX 1

 selects COAX 1 CONNECTOR through the impedance 

matching T circuit.

 e. 

TUNED COAX 2

 selects COAX 2 CONNECTOR through the impedance 

matching T circuit.

 f. 

BALANCED OUT

 selects the balanced and End Fed Wire output 

connectors located after the impedance matching circuit.

7. 

160 METER SWITCH

 Pushing this button to the IN position switches in 

extra inductance for the 160 Meter Band. The button should be in the 

OUT position for use on all other bands - 80m - 6m (requires 12 VDC).

8. 

TUNE

 Continuously adjustable differential capacitor.

9. 

INDUCTOR

 15   H continuously variable ceramic roller inductor driven

  by a crank handle. Coupled to the crank handle is a gear-driven 

  precision mechanical counter. The end stop readings on the turns 

counter are ZERO and 288.  Zero is maximum inductance and 288 is  

minimum inductance.

μ

Summary of Contents for AT-500

Page 1: ...Tuner l 600 W PEP SSB 500 W CW l 160 m to 6m l Differentialcapacitorwith6 1vernierdrive l Dual movement cross needle meter l 5 5 H x 10 W x 11 3 D 9676 N Looney Rd Piqua OH 45356 USA 937 773 6255 800...

Page 2: ...HT 8 LB S 4 Kg l CHASS I S COVER 11 ga 0 90 gold I r idi te Treated Alu min i um AT 500 SPECIFICATIONS Page 2 PALSTAR AT 500 GENERAL DESCRIPTION The American made Palstar AT 500 Antenna Tuner The AT...

Page 3: ...ifier ou tput to the AT 5 00 DO NOT USE MOR E T HAN 500 Watts C W 600 Watts PEP SSB thro ugh the tune r INSTALLATION Page 3 To 12 13 8v Power Supply 2 1 mm FEMALE plug Grey TRACE ID Protection Reverse...

Page 4: ...7 8 9 a DIRECT BYPASS selects BYPASS COAX CONNECTOR bypassing the impedance matching circuit but providing SWR FORWARD and REFLECTED power meter readings b DIRECT COAX 1 selects COAX 1 CONNECTOR bypa...

Page 5: ...0 SCHEMATIC COPYRIGHT PALSTAR 2011 2014 PALSTAR RF Directional Coupler Peak Peak Hold Meter Board Crossneedle SWR Meter 15 H Roller Inductor 12 H Roller Inductor 360pF 14pF 360pF Variable Capacitor Pa...

Page 6: ...RD ADJUSTMENTS Reverse Low Reverse High Forward Low Forward High Peak Hold Peak Peak Low Power Range Peak High On Off PALSTAR INSIDE VIEW ROLLER INDUCTOR DIFFERENTIAL CAPACITOR COUPLER METERING ASSEMB...

Page 7: ...T UN ED pos it ion m atch ing your antenna connec tion To tune your anten na t he sw itc h s elec tion m us t b e s et to COAX 1 T UN ED COAX 2 TU N ED or BAL AN CED L IN E S elec ti ng COAX 1 DIR EC...

Page 8: ...ce p ta b le SWR lengthe n or s hor ten yo ur antenna a nd o r feedl ine s and retune 3 I f you get low SW R read ings at m ore than one s etti ng us e t he s ett ing that gives h ighe st FO R WAR D p...

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