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Operating Your AT5K  cont’d     

4. Any time a new or different antenna is connected, it is necessary to repeat 

the tuning procedure for the new antenna. 

Troubleshooting 

You hear a spitting sound while tuning your AT5K at high power.

 

You are probably tuning into an impedance that is on the low side (20

Ω 

– 40

). 

In this event, either reduce transmitter/amplifier power to a lower setting or 
change to a higher antenna impedance by using a different antenna or modifying 
the existing antenna. 

Also, try to find the highest capacitance setting (i.e. closer to 100 on the dial) on 
the output knob. This will probably require re-adjustment of the inductance 
setting. 

An antenna capacitance setting that is too low under these conditions will result 
in excessivly high voltages, high losses, and poor efficiency. 

For example: at 1500 Watts into a 25

Ω 

load @ 3.5Mhz will produce the 

following: 

In the first instance the tuner will arc and suffer almost 16% loss of which 80% 
will be dissipated in the roller inductor. 

 

 

 

 

 

Ω − 15 Ω

Ω − 15 Ω

Ω − 15 Ω

Ω − 15 Ω

 

1000 watts (all bands) 

15 

Ω − 25 Ω

Ω − 25 Ω

Ω − 25 Ω

Ω − 25 Ω

 

1500 watts (all bands) 

25 

Ω − 50 Ω

Ω − 50 Ω

Ω − 50 Ω

Ω − 50 Ω

 

3500 watts (all bands) 

50 

Ω − 2000 Ω

Ω − 2000 Ω

Ω − 2000 Ω

Ω − 2000 Ω

 

160M — 3500 watts 
80M - 15M—3500 watts 
10M — 1500 watts (29.5 MHz max) 

Power Specifications 

(assuming single tone key down) 

Antenna Impedance 

Max Power Rating 

Output Cap

 

Inductor

 

Voltage

 

Loss

 

100pF 

11.7 µH 

4550 

16% 

200pF 

6 µH 

2400 

8% 

300pF 

4 µH 

1600 

6% 

 

                             Rear Panel Description    7 

1-800-773-7931    WWW.PALSTAR.COM 

 

12 VDC INPUT (2.1 
mm plug) for 12VDC 
@ 500mA to power 
the metering, lamp, 
relay and fan. 

RF INPUT coaxial 
connector for input 
from transmitter or 
amplifier. 

GROUND post/wing nut 
ground connector. 

BALANCED OUTPUT two 
nylon High Voltage post 
connectors for output to RF 
balanced twin-lead antennas. 
Relay switched from front 
panel control. 

COAX 2 coaxial connector 
for output to Antenna Two. 

COAX 1 coaxial connector 
for output to Antenna One. 

BYPASS coaxial connector for 
output to dummy load or reso-
nant antenna. Bypasses tuner, 
but meter circuits are on if 
12VDC adaptor is connected 
to jack located on rear panel. 

FIGURE 1 REAR PANEL CONNECTORS 

Summary of Contents for AT5K

Page 1: ...oney Rd Piqua OH 45356 USA Customer Service and Sales Telephone 1 800 773 7931 Fax 1 937 773 8003 Email info palstar com REV 1 6 09 02 2010 Copyright 2010 Palstar Inc Printed in the U S A AT5K 3500 Wa...

Page 2: ...It is intended for use with a 3 wire properly grounded power socket Do not defeat the safety purpose of the supplied line cord and plug 11 Power Sources This product should be operated only from the...

Page 3: ...operating instructions An improper adjust ment may result in damage and will often require extensive work by a qualified technician to restore the product to its normal operation e If the product has...

Page 4: ...alstar AT5K Antenna Tuner This antenna tuner has been designed and manufactured to high quality standards and will provide reliable operation for many years Please carefully read the Owner s Manual in...

Page 5: ...ncluding the original box manuals accessories and copy of sales receipt Returns must be within 14 days of purchase Returned items are subject to a 25 restocking fee Shipping is not refundable NOTE Kee...

Page 6: ...white BALANCED OUTPUT posts back panel Note that for bal anced operation the BALANCED COAX switch on the front panel must be in the IN position and an LED above the switch will light indicating balan...

Page 7: ...16 loss of which 80 will be dissipated in the roller inductor 8 15 15 15 15 1000 watts all bands 15 25 25 25 25 1500 watts all bands 25 50 50 50 50 3500 watts all bands 50 2000 2000 2000 2000 160M 35...

Page 8: ...na controls vary the capacitors and provide fine adjustments The roller inductor crank control provides coarse adjustment 9 When you have tuned your antenna to the best SWR record the settings of the...

Page 9: ...UPUT INDUCTOR SUGGESTED ACTUAL SUGGESTED ACTUAL SUGGESTED ACTUAL 160 M 32 32 20 80 M 31 33 148 40 M 28 35 202 20 M 34 32 208 15 M 44 14 218 10 M 100 10 229 Note end of the roller max turns clockwise i...

Page 10: ...10 AT5K Schematic AT5K Schematic 11 Balanced Line COAX...

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