Lemco Mod7, Mod8 User Manual

Input video signal
Input connectors

Input audio signal
Input connectors

Working RF channels

RF output level

Loop-through circuit:

Output channel
Norm:
Output Impedance

Power Supply
Operation Temperature

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:

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:

1 x 1 Vpp / 75Ω
1 x RCA' female'

1 x Mono 0,25...0,5 V

RMS

/ 47 ΚΩ

1 x L/R RCA 'female'

VHF: E5...E12
S3...10 & S11...S20 & S21...S41
UHF: C21...C69

85dBμV (MOD7)
100dBμV (MOD8)

Yes (MOD7)
No (MOD8)

0...20 dB
PAL B/G (ask for other norms)
75Ω

230VAC / 4.2VA

0...+45oC

Technical Specifications

** Lemco may change any technical specification of this product without prior notice

Lemco - www.lemco.gr

MOD7/8

"Full Band" RF PAL Modulator

Description

The MOD7/8 is a “full-band” RF PAL mono modulator operating all channel
frequencies from VHF and UHF band. It accepts one CVBS and one L/R
audio signal and modulates them to the preferred RF output frequency.

The MOD7/8’s user interface comprises two tact switches (for the channel
selection) as well as one SSD (Seven Segment Display) to display the current
working frequency. An internal PLL ensures the stability of the output
channel frequency.

The MOD7 modulator offers a loop-through circuit (for multiple modulator
interconnect) as well as an output RF level of 85dBμV.

The MOD8 does not support loop-through circuit but offers a high output
level of 100dBμV for situations where high RF level is mandatory.

MOD7 Top cover

Image Νο.1

1. RF output channel selection in VHF/UHF band. All RF channels are
displayed in frequency order.

2. SSD (Seven Segment Display) depicts the current selected RF output
channel.

3. These two LEDs display the current selected frequency band, e.g. “S” for
“S” channels (S03…S41) and “C” for VHF (E05…E12) and UHF (C21…C69)

channels.

4. Output RF 20dB attenuator

Programming guidelines

The following steps are required for the programming of the MOD7/8:

Step No 1: With the use of the UP/DOWN buttons the user is able to select
the desired RF output channel. The number of the current selected RF
output channel is displayed on the SSD (Νο.2) while the “C” and “S” LEDs
depict the current selected frequency band (Νο 3). The user is able to mute
the RF output of the modulator by selecting the option “00” from the SSD.

Automatic button lock mechanism

The MOD7/8 implements a simple “button lock mechanism” to prevent
accidental press of the two buttons. To unlock the automatic button lock
mechanism, the user must first press one button to unlock the keypad and
then press again to begin his RF output channel selection procedure.

Step 2: When the user has selected the desired RF output channel, they
must wait for 3-4 seconds for the PLL to lock. This procedure is indicated by
the flashing SSD.

Step 3: Finally, the user adjusts the output RF level by turning the onboard
RF attenuator to the left or right (No.4 from Image No.1).

This product complies with the relevant clauses of the European
Directive 2002/96/EC. The unit must be recycled or discarded
according to applicable local and national regulations.

Equipment intended for indoor usage only.

Conforms with the essential requirements of the EMC Directive
2004/108/EC the Safety Directive 2006/95/EC and 2001/65/EU RoHS
Directive, based on the following specifications applied:

 EU Harmonized Standards:
 ΕΝ 55103-1: 2009

 ΕΝ 55013-2: 2009
 ΕΝ 60950-1:2006 + Α12:2011

 ΕΝ 62479: 2010