Jackson Labs FireFox, Руководство пользователя

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© 2006 Jackson-Labs 7
FireFox Synthesizer User Manual
Use the up and down keys to change the frequency triplet. You may also press and hold the up or
down keys to automatically scan through the frequency range. The speed of the scan will increase
after a short time intervall.
When scanning the frequency using the down key, the display will show 0Hz after some time if the
selected frequency triplet has been reduced to 0Hz. Release the down key, then press and hold the
down key again to start scanning the frequency triplet below the one originally selected. The
frequency scanning in this mode will then start at 999....Hz.
As an example, set the frequency to 10.0MHz. Now place the cursor onto the 0 digit of the 10MHz
triplet (the single-MHz digit). Press and hold the down key, and the frequency will scan through 9, 8,
7.... 0 MHz. The display will now show “Uncal! 0MHz”. Release the down key, and press and hold it
again. The cursor will now be automatically placed onto the 1KHz digit, and down-scanning of the
frequency will commence at 999KHz.
A menu item for the upper frequency limit can be set to limit the highest frequency the unit can
generate. This item is accessible in the
SETUP->OUTPUTS->FREQ-LIMIT menu. You may select
any frequency as the upper limit in this menu, and the unit will then not allow higher frequencies to
be selected from the front panel. Check the frequency limit setting if you are not able to configure the
unit to generate signals up to the 1.64GHz maximum frequency.
1.4.5 Setting the RF Amplitude
The unit has an analog RF output connector that will provide a sine wave for 50 Ohm terminated
loads. The RF output is enabled for frequencies from 2MHz to 1640MHz. The VALID LED next to
the RF-OUT BNC connector indicates if the selected frequency is within the range of the RF-OUT
connector. The power level of the output sine wave may be controlled via the front panel keypad. The
unit has two output level selecting modes:
•
Relative output level ranging from 0% to 100%
•
Calibrated absolute output level from -40dBm to +10dBm.
Select the mode in SETUP->OUTPUT->POWER UNIT
The relative output mode allows the unit to produce its maximum output power which may range
from +7dBm to over +18dBm depending on the frequency. The absolute output power mode will
generate a calibrated output power into a resistive 50 Ohm load connected directly at the RF output
connector on the front of the unit with typically better than +-0.2dBm accuracy and 0.02dBm
resolution.
Move the cursor onto the RF amplitude digits in the frequency setting mode. Press the up or down
keys to change the output power.
The unit also has a power limit menu similar to the frequency limit menu explained in paragraph
1.4.4 . Please check the power limit in the SETUP->OUTPUT->POWER LIMIT menu if you are
unable to select a desired power level up to 100% or +10dBm.