Using LF Radio
Note: LF radio signals have the greatest range at night, peaking around 1 AM local time. It
may be necessary to perform this procedure after dark.
Configuringthe SyncServer
1. On the
REFERENCES - LF Radio
page, select the appropriate radio time service and click
APPLY
.
2. On the
TIMING - HW Clock
page, enable the LFR reference (shown as
DCF77
,
JJY
, or
WWVB
) and click
APPLY
.
3. Monitor the
Signal Quality
on the
REFERENCES - LF Radio
page for several days. At a min-
imum, there should be blocks of vertical green bars for each night. If not, the user should
re-evaluate the location of the LFR’s location.
TroubleshootingAntenna Locations
If the LFR’s LED indicates no signal (Solid On) or weak signal (Intermittent Flashing):
n
Test LFR reception at night time. Use the battery holder/TNC cable.
n
Move the LFR away from sources of radio frequency interference (RFI), such as switch-
ing power supplies, transmitting antennas, computers, transformers, HVAC, and other
electrical equipment or motors.
n
Reposition the antenna away from or outside any shielding structures, such as metallic
enclosures.
n
If a structure has too much RFI or shielding, it may be necessary to position the antenna
outdoors.
n
Check that your location is within reasonable range of an LF transmitter.
MountingOutdoors
When mounting the LFR outdoors:
n
Observe all local codes and regulations.
n
It may be necessary to use a lightning/surge suppressor.
n
Position the antenna away from sources of radio frequency noise.
AdditionalResources
Online References
n
NIST Radio Station WWVB
http://tf.nist.gov/stations/wwvb.htm
n
PTB Website for DCF-77
http://www.ptb.de/en/org/4/44/442/dcf77_1_e.htm
n
Japan Standard Time Project - JJY
http://jjy.nict.go.jp/jjy/index-e.html
MicrosemiWorldwide Sales
Note: Please feel free to contact
microsemi.com/sales-contacts/0
online about borrowing a kit for testing Low Frequency
997-01520-02 Rev. F1
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