Using LF Radio
n
Local electromagnetic conditions such as shielding and sources of radio frequency noise.
The best conditions are therefore:
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Areas closer to transmitters.
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Antenna perpendicular to transmitter.
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Antenna horizontal to ground.
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Night time.
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Low RFI noise.
If LF radio is being considered as the primary reference for the SyncServer, the Rubidium
oscillator option can be employed to provide long term holdover when the LFR signal is
impaired to the point where the SyncServer cannot lock to it.
Unpacking
1. Verify that the part number (on the label of the large pink anti-static bag) matches the
radio time service specified at the time of purchase:
n
1520R-LFR60-KIT for WWVB, 60 kHz, Colorado, USA
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1520R-LFR77-KIT for DCF77, 77.5 kHz, Hesse, Germany
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1520R-LFR60-KIT for JJY, 60 kHz, Kyushu, Japan
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1520R-LFR40-KIT for JJY, 40 kHz, Fukushima, Japan
2. Verify that the following items are present:
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RG-59 coaxial cable (50 ft, 15 m)
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LFR module (Disk-shaped)
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Mounting bracket (part #4186-8P) and a bag of 4 mounting screws
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9 volt battery holder with TNC connector (part #110-6210)
Please contact
Microsemi Customer Assistance
(on page 5) if any items are missing or
damaged.
ConnectingandFindingaSignal
Choosing a Site
n
LF signals can penetrate structures and are often available indoors, particularly at night
when LF signal strength and range are highest.
n
To avoid the cost and effort of running a cable through the building, the user should test
signal quality at indoor sites close to the SyncServer.
n
If the structure limits LF signal quality and/or longer signal availability is important, the
user should test signal quality nearer to the exterior of the building, or outdoors.
n
Place the LFR outside RF shielded structures and away from strong RF emitters.
n
Avoid mounting the antenna on or near metallic objects.
Applying Power
Use battery power to test signal quality easily over a variety of locations:
1. Connect a 9-volt battery (not supplied) to the battery holder/TNC cable.
997-01520-02 Rev. F1
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