Holland Electronics HMDD-1U User Manual

INSTALLATION MANUAL

Model:HMDD

ATSC Digital Mini Demodulator

Caution:

These servicing instructions are for use by qualified service personnel only.
To reduce the risks of electric shock, do not perform any servicing other than
that contained in the operating instructions unless you are qualified to do so.

This symbol indicates “dangerous voltage”-there is the risk of an electric shock.

This symbol indicates that there are some important instrutions for this particular
product.

TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT TAKE THE COVER OFF.

NO PART OF THE RECEIVER CAN BE REPAIRED BY THE USER.
PLEASE CONSULT A QUALIFIED TECHNICIAN FOR ANY REPAIRS.

WARING:

Electronics LLC

8. TROUBLESHOOTING

a. Ensure you are using quality multiple shielded cables with quality radial or

compression F-connectors.

b. Ensure the cables center conductors are making solid contact with the HMDD

Antenna Input, Audio Output, and Video Output port.

c. If HMDD is receiving power but no signal, check to be sure the video cable is
securely connected between the HMDD and the video source, and the video
and/or audio cables are securely connected between the HMDD and the modulator.

d. If the HMDD is not receiving power make sure the power cable is firmly
connected. Be sure the power source is properly rated to handle the HMDD load
especially if other equipment is being powered by that same source.

-7-

a1.1

This package contains:

- One HMDD ATSC Mini Demodulator

- One HMDD Installation Manual

2. PRODUCT DESCRIPTION

The HMDD is an ATSC professional grade mini demodulator designed
for cost effective digital-to-analog conversion of an unencrypted 8VSB (Off-Air
SD/HD TV signal) signal to baseband.
NTSC video and left and right stereo audio outputs. All of the 18 ATSC video
formats including HD format can be received by the HMDD and converted to
display on non-digital TV sets over analog channels with the use of a modulator.

1. PACKAGE CONTENTS

-1-

１

Input frequency range

57-803MHz

２ Channels

2-13（VHF）14-69（UHF）

３

8VSB input channel bandwidth

RF

6 MHz

４

Data rate

19.392 Mbps

In

put level range

-7 dBm to -80 dBm

7 A

djacent channel rejection

60dB

Im

age

rejection

40dB

9

Demodulation m

ode

8VSB, 8VSB MP

10

S

ymbol clock fr

equen

cy

10.762 MHz

11

I

nput connector

75 ohm F-female

GENERAL

1. Video output (analog)

Frequency response

30Hz to 4.2MHz, +/-1.5dB

Video output level

1Vp-p +/- 0.2V

Impedance

75ohms

Connector type

75ohm F-female

2. Audio L/R outputs

Impedance

10K ohms.

Level

1.3Vp-p +/-0.2V

Frequency response

30Hz to 20kHz, +/-2dB

Distortion

1% max

Connector

RCA.

3. Power consumption

Power

DC5V / 350 m A 1.75W

DC12V / 250 mA 3 W

235 x 27 x 88mm

５

Noise figure < 8dB

6

8

3. SPECIFICATIONS

1

[ Air ]

2

3

[ Search ]

4

[ Nosig ]

5

[ A69.1 ]

6

-6-

Press SCAN button for at least 10 seconds to reset to facory default.

CH- button to increase or decrease

volume . (Preset audio volume level of 75%, sample 12)

h.Press and hold ZOOM button, select CH+ to display current signal strength.

（sample 13）

i. Press and hold ZOOM button, select CH- to display current signal quality.

（sample 8 ）

j.

7

8

9

[

Language1

]

10

[ Default ]

11

[ Default
Ok ]

12

[ Volume
75% ]

13

14

[ Strengh
96 % ]

[ Quality
100 % ]

g.Press and hold AUDIO button, select CH+ or

k.Fourteen samples of “8” shape display as below:

15

[ 4:3 /
Letterbox]

16

[ 4:3 /
Zoom]

17

[ 4:3 /
Center]

[ 4:3 /
Full]

[ 16:9 /
Zoom]

[ 16:9 /
Center]

[ 16:9 /
LetterBox]