User manual

Section 3: Installation 3-13
Moseley SL9003Q 602-12016 Revision G
Procedure
1. Connect the equipment as shown in Fig. 3-4. Be sure to physically separate the
TX and RX units by greater than 15 feet.
2. Ensure the link is RF operational as outlined in the RF Bench Test (Section
3.2.1). Adjust the attenuator for an RSL reading of –60 dBm +/- 2 dBm and
verify error-free operation.
3. Composite Test: Apply a 400 Hz stereo tone, at a level of 0 dB (full scale),
to the left and right channels of the FM Stereo Generator for 100% modulation.
(Some digital stereo generators use –2.75 dB to represent 100% full scale,
consult your manufacturer’s information.)
4. Apply the composite signal, 100% modulation at 3.5 Vp-p to the composite input
of the transmitter. (Alternatively apply 3.5Vp-p 400 Hz tone directly from the
audio generator to check levels only).
5. The front panel bar graph of both the transmitter and the receiver should register
a -3 dB reading (YELLOW LED) for both Channel 1 and Channel 2. A slight
increase in level should indicate 0 dB reading (RED LED). ( Note: There is
exactly 2 dB of headroom above the 0 dB indication (RED LED) before the A/D
input clips).
6. Separation: Measure the 400 Hz level and set a reference for left and right
channels.
7. Disconnect the tone on the right channel to the stereo generator and measure
the level in the right channel.
Left-to-Right Separation: > 65 dB
8. Signal to Noise: Disconnect the tone on the left channel to the stereo generator
and measure the SNR.
L/R SNR: > 82 dB (85 typ).
9. Reapply the 400 Hz tone and measure THD.
L/R THD: <0.035%
10. Composite Data Test: Apply the RS-232 data source to the 9-pin CHANNEL 1
connector on the Starlink transmitter and the RS-232 data receiving unit to the