Magnum AlphaForce Operating Manual - page 9
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CALIBRATE: CAL position activates the meter to cali-
brate for SWR measuring. To calibrate for SWR, set
the switch to the CAL position, press the PTT switch
and rotate the calibrate control (refer to 7) until the meter
(refer to 13) needle lines up with the CAL mark on the
far right side of the meter. Once lined up, release the
PTT. The transceiver is now ready to measure SWR.
NOTE: When first attempting to calibrate make sure
the transceiver is in the AM mode (refer to 22). If it is
not possible to calibrate in AM, then switch to FM mode.
STANDING WAVE RATIO: SWR position activates the
meter to measure the standing wave ratio of the trans-
ceiver and antenna system. After the meter is cali-
brated, set the switch to the SWR position and press
the PTT switch. The meter (refer to 13) will measure
the SWR. For optimum performance the SWR should
be below 1.5 to 1, the first green segment on the SWR
portion of the meter indicates an acceptable standing
wave ratio.
6.
ALL MODE TALK BACK CONTROL
All Mode Talk Back, a Magnum exclusive, is an inde-
pendent talk back monitor. The AMT functions in all
modes and allows the operator to monitor the trans-
mitted audio of the AlphaForce. To increase the vol-
ume of the talk back rotate the control clockwise. To
decrease rotate counterclockwise. To turn off the talk
back rotate the control completely counterclockwise.
7.
CALIBRATE CONTROL
Rotate to calibrate the meter (refer to 13) for SWR mea-
surements. See instruction 5 for more information.
8.
ECHO ON/OFF and VOLUME CONTROL
Turns on and off the echo feature, and varies the vol-
ume or number of repetitions. To turn on the echo fea-
ture and increase the echo volume, rotate the control
clockwise. To turn off the echo feature rotate the con-
trol completely counterclockwise to the OFF position.
9.
ECHO DELAY CONTROL
Varies the amount of delay, or duration of the echo rep-
etition. Rotate clockwise to increase the amount of
delay and counterclockwise to decrease.
10. POWER
Rotate clockwise to increase RF output power. Rotate
counterclockwise to decrease RF output power.
Variable RF output power allows low power transmit-
ting for QRP operation in compliance with the FCC re-
quest for reduced signal strength during periods when
propagation levels are high.
11. FREQUENCY
Rotate clockwise or counterclockwise to select the
desired frequency.
12. MICROPHONE INPUT
A 6-pin, lock ring type, microphone connector is used.
Microphone wiring is as follows:
Pin 1 : Microphone Audio
Pin 2 : Receive
Pin 3 : Transmit
Pin 4 : Down (Up w/ 22K Ohm Resistor)
Pin 5 : Ground
Pin 6 : +13.8 VDC
13. METER
The meter indicates receive signal strength, RF output
power, SWR calibrate and SWR. The top horizontal
bar graph indicates calibration and measuring of the
standing wave ratio. The center bar graph indicates
RF output power. The bottom bar graph indicates re-
ceive signal strength.
14. PUSH-TO-TALK SWITCH
Press and hold the switch to transmit. TX will appear
on the LCD screen when transmitting. Release the
switch to receive.
15. UP and DOWN FREQUENCY CONTROLS
Allows remote operation of the frequency control. Press
the up arrow to increase the frequency and press the
down arrow to decrease the frequency.
IMPORTANT!
Operating some of the features in 16 through 23 re-
quire the use of the function control. To activate the
function control, momentarily push the FUNC (16) con-
trol, the FUNC prompt will be displayed in upper left-
hand corner of LCD. Push the control again to deacti-
vate the function control.
16. FUNCTION
This control is used to operate the functions that are
printed below the control buttons. To activate, press
and release. FUNC will be displayed on the LCD indi-
cating that the function command is activated. After
you have pressed one of the buttons the FUNC prompt
will disappear from the screen.
17. STEP / NB / 1
STEP: The STEP control selects frequency resolution
in either 1 kHz, 10 kHz or 100 kHz steps. Press the
STEP button, one of the digits will flash on and off.
Press the STEP button again to change stepping reso-
lution.