Olson Technology LP-CAN - Manual (Page 8)

025-000580 Rev. X1 www.olsontech.com 8
transmitter for minimum gain, set S1 to “0” and the bottom switch of S2 to the left. To set the
transmitter for maximum gain, set S1 to “F” and the bottom switch of S2 to the right.
The top switch of S2 also allows the final RF amplifier to be switched on or off (Mute). When
the receiver output is Muted, the RF output level typically drops by 30dB. Note that the RF
Level detector (discussed later) still functions as though the receiver is not muted.
J1 & J3 allow easy measurement of the transmitter optical output power using a Digital Volt
Meter (DVM). J1 is a ground. J3 gives an indication of the Optical Input Power. The scale
factor is 1.0 V/mW. J2 is the optical input. D1 indicates the RF Output Power level. D2 indi-
cates the input RF Level. Figure 2 indicates the thresholds at which D2 will switch. D2 will be
yellow if the RF level is below the low threshold, red if the RF level is above the high threshold
and green if the RF level is between the low and high thresholds. For most applications, if D2
is green, then the RF level is in the optimum range. Table 1 shows the behavior of the Re-
ceiver D2 LED. J4 is the RF Output. It is a high-frequency F-Type Female (75Ω) Connector.
Alternately a 50Ω SMA connector can be provided.
Table 1 - Receiver D2 LED Behavior
RF Output Level D2 LED Color
<-37dBm Yellow
≥-37dBm and ≤ -22dBm Green
>-22dBm Red
Note: This holds true even if the Receiver output is Muted