© 2006 Jackson-Labs
13
FireFox Synthesizer User Manual
Typical signal levels at the mixer inputs are -20dBm to 5 dBm for the RF input, and 0dbm for the LO
input. Care must be exercised to avoid driving the Mixer RF and LO inputs above 10dbm. Driving
the inputs above this level could damage the mixer.
The mixer can be disabled in the menu settings to reduce potential interference.
1.4.12 Storing and Recalling Setups
The FireFox unit can store up to 10 independent setups in its internal Non Volatile memory. To store,
recall, and erase setups, enter the Memory menu by pressing
MEMORY->RECALL/SAVE/ERASE
.
Once inside the SAVE or RECALL menu items, press the UP or DOWN key to select a memory
position to save to, or recall from. Positions 0 to 9 are selectable.
An empty memory position is indicated by a “-” sign, an occupied position is indicated by a “*” sign.
Save a memory setup by pressing the ENTER key in the SAVE menu. You may exit the save menu
by pressing the EXIT/MENU key.
Recall a memory location by pressing the ENTER key in the RECALL menu. You can exit without
recalling by pressing the EXIT/MENU key.
The user may erase only the entire memory. This is useful if all memory locations have been
filled-up, and the older data is no longer useful.
Erase all memory positions by pressing ENTER in the ERASE menu. Exit the erase menu without
erasing any data by pressing the EXIT/MENU button.
All FireFox settings such as Maximum Frequency, Power settings, the Frequency, Power Unit, output
power and other settings are saved in these memory locations.
Please note that GPS relevant data such as the GPS position in Position Hold mode, the GPS GMT
time offset, etc. are not maintained in these memory locations, but rather inside the GPS itself.
1.4.13 Using the GPS and OCXO Reference Outputs
1.4.13.1 GPS Receiver 1PPS Output
The FireFox Signal Generator provides a highly stable 1PPS CMOS 3.3V compatible output pulse on
its’ rear panel 1PPS BNC connector. This pulse is derived from the Motorola M12+ GPS Timing
receiver. It does exhibit the typical M12+ sawtooth waveform, which may be compensated by using
the Motorola Clock Granularity Message available on the rear panel GPS RS-232 port. See the
Motorola M12+ documentation about details of how to use these two outputs.
The rear panel 1PPS output is buffered by a high-speed, 3.3Vpp CMOS output, and this output
should typically drive an open-ended 50 Ohm transmission line/cable. Terminating the output with a
50 Ohm resistor will not damage the output, but will significantly reduce its output voltage swing.
The CMOS buffer adds ca. 6ns of Tpd propagation delay to the GPS receivers’ 1PPS output signal;
this delay may be compensated in the receiver by using the Antenna Cable Delay setting available
when connecting the WinOncore12 software to the GPS receiver. See section
1.4.14.3
and section
3.5.3
for details about the WinOncore12 software.
Summary of Contents for FireFox
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