User's Manual Part 1

Installation and Set Up Chapter 3
OEMV Family Installation and Operation User Manual Rev 5B 51
Occupation Time
The LED that is glowing green corresponds to the DL-V3’s occupation time gauge. The
occupation time LEDs provide an indication of whether sufficient data has been collected for
successfully post processing data for the indicated baseline. The LED that appears corresponds
to the baseline length that you can process your data to, where the first LED to the left is #1. The
occupation time gauge has the following values from left to right, see Table 15:
Table 15: Occupation Time LEDs
3.3.6 External Oscillator (OEMV-2, OEMV-3, DL-V3 and ProPak-V3 only)
For certain applications requiring greater precision than what is possible using the on-board 20 MHz,
voltage-controlled, temperature-compensated crystal oscillator (VCTCXO), you may wish to connect
the OEMV to an external, high-stability oscillator. The external oscillator can be either 5 MHz or 10
MHz.
Operation consists of connecting a cable from the external oscillator to the receiver’s external
oscillator input connector. For the DL-V3 and ProPak-V3, the BNC external oscillator port, labelled
OSC, is used. See Figure 6, DL-V3 (top) and ProPak-V3 (bottom) Enclosures on Page 26. For the
OEMV-3, an MMCX female connector (J700) is used, as shown in Figure 12 on Page 39. On the
OEMV-2, the external oscillator connector is J501, see Figure 11 on Page 38. The receiver does not
have to be powered down during this procedure. If you are handling the OEMV card directly, anti-
static practices must be observed.
Once the external oscillator has been installed, the EXTERNALCLOCK command must be issued to
define the clock model (for example, cesium, rubidium or ovenized crystal). If the input clock rate is 5
MHz, the EXTERNALCLOCK command must be issued to change the 10 MHz default rate.
3.3.7 Antenna LNA Power
Receiver RF input gain requirements are easily met when using NovAtel antennas and coaxial cables.
NovAtel antennas employ a built-in, low-noise amplifier (LNA), which typically provides 26 dB of
gain to the received satellite signal. The power to the antenna LNA is provided through the center
conductor of the receiver’s RF port. To achieve the required input gain to the receiver, NovAtel
coaxial cables have been designed to exhibit no more than 6 dB loss. Antenna supply over-current
protection is provided on the OEMV cards and is limited to 100mA.
LED#
Baseline
Length
(km)
LED
Color
1
≤ 5
Green
2
> 5
≤ 10
Green
3
> 10
≤ 15
Green
4
> 15
≤ 20
Green
5
≥ 20
Green