Page 3
ON INITIAL POWER-UP
Display will indicate STBY mode (stand by). To switch the mode press
the “MODE” button on the touch-screen display to switch to “OPR” mode
(operational)
To change the POWER UP MODE push MENU then NEXT until SELECT
POWER UP MODE displays at the top. Now select desired POWER UP
MODE: STANDBY, LAST USED or OPERATE.
SCREEN DISPLAY ON POWER-UP
STANDBY MODE
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
a tune sequence when using our HF-AUTO Antenna Tuner. After the
HF-AUTO is tuned, push MODE to select “OPR” for operation mode.
PALSTAR
Page 20
NORMAL MODE KEYING
HOW KEYING WORKS:
When the PTT line goes low, the ampli er won’t close it’s transmitting
output relay until it gets a solid frequency reading and switches bands. This
requires 14 ms of RF being applied.
The output relay then closes, requiring 9.5 ms to close. The total elapsed
time at this point is 23.5 ms.
The input relay then closes (it was energized 2 ms after the transmit relay)
This adds a 2.5 ms delay. High power now appears at the output.
The total delay therefore is approximately 26 ms.
RF
APPLIED
OUTPUT
RELAY
CLOSED
INPUT
DRIVE
RELAY
CLOSED
HI-POWER
RF is now at
OUTPUT
VALID
BAND
FREQ
DETECTED
Transceiver Delay
PTT
LOW
9.5 ms
14 ms
2.5 ms
TOTAL DELAY
= 26 ms approx.
0 ms
