Motorola BLE100 Input and Midstage Pads, Flatness Control, Frequency versus cable slope

Amplifier Setup 3-7

The information in Table 3-2 is shown as a graph in Figure 3-2:

Figure 3-2

Frequency versus cable slope

	1
	0
	-1															SCS-1
	-2
																SCS-2
	-3
(dB)	-4															SCS-3
	-5															SCS-4
slope
	-6															SCS-5
Cable	-7															SCS-6
	-8
	-9															SCS-7
	-10															SCS-8
	-11															SCS-9
	-12															SCS-10
	-13
	40	45	50	72	108	150	211	250	300	350	400	450	550	750	870	1003

Frequency (MHz)

Input and Midstage Pads

Install Model JXP-*B pads to attenuate the signal per system design drawings. Generally, this consists of attenuating excessive input levels. You should pad the input to system levels for unity gain. Select and install the specified pad in the socket labeled JXP-INon the chassis cover.

You can use the midstage pad (JXP-MID) to adjust the gain level and achieve the gain specification. Refer to Section 6, “Operating Tips,” for midstage padding information and recommendations.

Flatness Control

The LDR/9/1G circuit board includes flatness controls and a fixed cable equalizer for 1003 MHz. This equalizer, plus the contribution of the hybrid gain stages, produces approximately the dB of slope indicated by the model number (9 dB of tilt with an LDR/9/1G).

You can adjust the LDR variable resistors and capacitors to flatten the response across the operating band. Use C1, C2, R1, and R2 on the LDR board shown in Figure 3-3 for low-end flatness response. The low-end flatness controls compensate for the roll-off caused by the diplex filters. Adjust C3 and R3 for a flat response across the mid-band. Adjust C7, C8, and R8 for a flat response across the band. Adjust C6 for maximum gain at the high end.

ƒC1 produces a peak that is centered just below the lowest forward frequency and varied in amplitude by R1.

BLE100 Installation and Operation Manual