Nokia 7000 Series, 6800 Series Operation, 2. Front Edge View, 3. VEA-6830 Module Top View

Chapter 6: VEA-6830 Video Distribution Amplifier Module Operation

Operation

A multi-turn Gain potentiometer provides adjustment over a range of -3 to +3 dB. The gain is increased when this pot is adjusted clockwise. Another multi-turn Equalizing potentiometer is used to adjust cable equalization. It is adjusted clockwise to obtain more equalization.

A single-turn Response potentiometer allows fine adjustment of the high-frequency response. However, it is factory-set/calibrated, and readjustment is not recommended without precise test equipment. These three potentiometers are located at the front edge of the module.

There is no need to terminate unused outputs; however, a perfect response can be obtained if unused outputs are terminated.

Jumper J1 sets internal 75￿ termination. If removed, it makes the input high-impedance.

Gain	EQ
	Response

Figure 6-2. Front Edge View

	A P1
GAIN	B
	C
EQ	D
	E
	F
	H
	J
	K
	L
	M
	N
	P
	R
	S

Figure 6-3. VEA-6830 Module Top View

52 6800/7000 Series - Distribution and Routing Products Installation and Operation Manual