Palstar LA-1K Technical Manual
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Palstar LA-1K Technical Manual

Rf sensing 1000w dual hf ldmos amplifier
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Palstar products are designed by hams for hams,
carrying on the Palstar tradition for high-quality
products designed and manufactured in Ohio, USA.
LA-1K RF SENSING 1000W
DUAL HF LDMOS AMPLIFIER
Speci cations Summary
•
1000 Watts PEP CW ICAS (160m to 6m)
•
RF Sensing Auto Band Switching
•
Color TFT Touch Screen
•
Variable Speed Fans
•
12.75" x 6.25" x 16.5"
•
Weight: 27 lbs, 12.3 kg
9676 N. Looney Road
Piqua, OH 45356 USA
Phone: (937)-773-6255
Toll Free: (800)-773-7931
Fax: (937)-773-8003
www.palstar.com
PALSTAR
PALSTAR
LA-1K RF SENSING 1000W
DUAL HF LDMOS AMPLIFIER
Technical Manual
Designed and Manufactured in the USA
Copyright 2020, Palstar Inc.

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Summary of Contents for Palstar LA-1K

  • Page 1 PALSTAR Palstar products are designed by hams for hams, carrying on the Palstar tradition for high-quality products designed and manufactured in Ohio, USA. LA-1K RF SENSING 1000W DUAL HF LDMOS AMPLIFIER LA-1K RF SENSING 1000W Technical Manual DUAL HF LDMOS AMPLIFIER Speci cations Summary •...
  • Page 2 SWR fault (such as an arc fault on the antenna, or lightning arrestor) The SWR • 250 W reading may be low or high after tripping but the LA-1K STAYS in bypass until you unkey the transmitter. The “BYPASS SWR” graphic will then continue to ash until transmit- •...

  • Page 3: Theory Of Operation

    It is completely independent of data from an external source to determine = 15.5ms approx. 0 ms frequency for tracking from band to band. As a result of this feature the LA-1K will function with any transmitting device without interconnecting data cable 9.5 ms 2.5ms...
  • Page 4 2.5 ms RF is now at OUTPUT NOTE: The wattmeter only shows the horizontal red power bar indicator when the LA-1K is producing power. It is recommended that for power up mode “STBY” is selected to allow VALID OUTPUT INPUT a tune sequence when using our HF-AUTO Antenna Tuner.

  • Page 5: Keying Modes

    SELECT MODE OPTION. Use the arrow keys (< and >) to select touch-screen display until “OPR” mode (operational) is displayed. The red NORMAL or DIRECT KEYING. NOTE: In DIRECT KEYING MODE the LA-1K will power bar indicator will only be visible when transmitting.

  • Page 6: Troubleshooting

    RF is present. RF must be applied with PTT line low to key the ampli er to the transmit state. NOTE: The LA-1K selects the proper band automatically when transmit (PTT or Push To Talk) is activated. Won’t amplify or auto-band switch when transmitting: Solution: Make sure that the PTT cable is connected to the transceiver.
  • Page 7 Reduce the drive level to prevent displaying this fault. Bypass + V d : (as seen on the TFT display) The LA-1K is in BYPASS to protect from loss of +50V, drain voltage supply. The fault should clear in a few seconds. This can occur when operating on 120V if the drain current (I d ) exceeds 32A.

  • Page 8: Other Menu Options

    Verify that your HF-AUTO or other tuner has obtained a good match while BACKLIGHT HIGH screen is displayed (the screen intensity used when the LA-1K is in standby. Attempting to tune at high power can cause this buttons are being pressed) and use < or > to adjust.
  • Page 9 POWER SUPPLY PERFORMANCE OTHER MENU OPTIONS If the LA-1K is used with 120VAC the max current rating is 33A. The DRIVE LEVEL on some of the bands may need to be reduced. SELECT ALC BASE VALUE To adjust ALC base value push the MENU button on the touch-screen...

  • Page 10: How To Update Firmware

    Switch transceiver to LSB or USB transmission. Press MENU on the • CONNECT the other end of the USB cable to the LA-1K front panel. A “Found 1 Device” message will appear on the right side of the opened LA-1K and NEXT until the SELECT ALC BASE VALUE screen is visible.
  • Page 11 The required cables are widely available. They can be used to connect to the ICOM and YAESU transceivers. Never use a tuning pulser in CW full break-in mode. The LA-1K was NOT designed for full break in CW operation Very high speed full break in RS-232 Band Control (Kenwood) Connector keying which toggles the PTT line can lead to ampli er damage.

  • Page 12: Required Connections

    0101 17/15m 3.5 V The phono input PTT can be activated by any transceiver with a PTT cable from the LA-1K to the transceiver (not supplied). When PTT is 0110 12/10m 2.5 V grounded TX is displayed and the LA-1K is ready to transmit.

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