3 - 1 4 | B e n c h S e t u p |
L a u n c h A m p l i f i e r O u t p u t S t a g e P a d d i n g
By definition the launch amplifier is everything between the optical receiver RF output and the node output connector. The launch amplifier output-stage pad-effects charts show the tradeoff, over a range of output levels, between composite triple beat (CTB) and carrier-to-noise ratio (c/n) when pads are inserted ahead of the individual output hybrids. It is assumed that the output of the link is constant, so that the same amount of attenuation is removed from the pad facility at the receiver output. The four pairs of curves, illustrated in Figures 3-8 and 3-9, are for pad values of 0, 3, 6, and 10 dB. An overall tilt of 12.5 dB is assumed for the 750 MHz model and 11.5 dB for the 870 MHz model.
F i g u r e 3 - 8 | | | | | | | | | | | | |
S G 2 - 7 5 l o w - g a i n o u t p u t - s t a g e p a d - e f f e c t s c h a r t | | | | |
| 85.00 | | | | | | | | | | | | -85.00 |
| 80.00 | | | | | | | | | | | | -80.00 |
| 75.00 | | | | | | | | | | | | -75.00 |
| 70.00 | | | | | | | | | | | | -70.00 |
dB | | | | | | | | | | | | | |
CNR, | 65.00 | | | | | | | | | | | | -65.00 |
| | | | | | | | | | | | |
| 60.00 | | | | | | | | | | | | -60.00 |
| 55.00 | | | | | | | | | | | | -55.00 |
| 50.00 | | | | | | | | | | | | -50.00 |
| 45.00 | | | | | | | | | | | | -45.00 |
| 38 | 39 | 40 | 41 | 42 | 43 | 44 | 45 | 46 | 47 | 48 | 49 | 50 |
Output Level (Highest Analog), dBmV - 12.5 dB Tilt
CNR-10
CNR-6
CNR-3
CNR-0 
CTB-0
CTB-3 CTB-6 CTB-10
S G 2 0 0 0 I n s t a l l a t i o n a n d O p e r a t i o n M a n u a l
