AValon RF TX618M User Manual

TX418M - UHF

TX518M - 900MHz-2.15GHz

TX618M - 2.15GHz-2.5GHz

70 mW Video Transmitter

User's Guide & Operating Manual

AV030528/1-000

REV. A1 - 23 December 2003

Prepared by Steve Jones

Authored by Eli Weinstein

http://www.avalonrf.com/

Avalon RF, Inc. • 344 Coogan Way • El Cajon, CA 92020

Phone: [phone] • Fax: [phone] • Email: [e-mail]

AVALON RF, INC. Page ii
TX418M/TX518M/TX618M User’s Guide & Operating Manual

Table of Contents

1. General .................................................................................................1

Figure A – TX618M Series Controls and Connectors ...........................2

Video.....................................................................................................3

Audio.....................................................................................................3

RF Output .............................................................................................3

2. Specifications ........................................................................................ 4

User Interface .......................................................................................4

Setup ....................................................................................................4

Electrical Interface ................................................................................4

Interconnecting .....................................................................................5

Figure B – Power/Video ........................................................................ 5

Figure C – Audio/Video.........................................................................5

Mechanical............................................................................................6

Mounting ...........................................................................................6

Mechanical Data................................................................................7

Figure D – TX618M Mechanical Outline ............................................... 7

Environmental Conditions ..................................................................... 8

3. Operating the transmitter. .....................................................................9

Operator Controls & Indicators .............................................................9

Channel Select..................................................................................9

On/Off................................................................................................9

4. Ordering information ...........................................................................10

Base models .......................................................................................10

Options ...............................................................................................11

Recommended Accessories ...............................................................12

Antennas .........................................................................................12

Cables .............................................................................................12

Battery Packs ..................................................................................12

AVALON RF, INC. Page 1
TX418M/TX518M/TX618M User’s Guide & Operating Manual

1. General

The TX418M/TX518M/TX618M series rugged transmitters are
intended for use in short range military, homeland security, mobile
security, broadcasting and motion picture production. All have an RF
output power of approx. 70mW.

The following table details a brief matrix of the transmitters:

Model Tuning range

TX418M 460MHz-860MHz 460MHz-860MHz VSB
TX518M 900MHz-926MHz 900MHz-2.150GHz FM
TX618M 2.4GHz-2.48GHz 2.150GHz-2.5GHz FM

All transmitters offer the following features:

• A single broadcast quality video channel with no delay.

• Two broadcast quality audio channels.

Any reference in this manual to TX618M series also implies the
TX418M and TX518M.

Extended tuning

Modulation

range (optional)

AVALON RF, INC. Page 2
TX418M/TX518M/TX618M User’s Guide & Operating Manual

Top View
1 Power On/Off
2 Antenna - MMCX

Bottom View
3 Audio/Video Input – See Figure C
4 Power/Video Input – See Figures B

Back View

5 Frequency Select

Figure A – TX618M Series Controls and Connectors

AVALON RF, INC. Page 3
TX418M/TX518M/TX618M User’s Guide & Operating Manual

1.1 Video.

The video input is buffered, combined with the two audio subcarriers,
then DC level restored, limited by a white level clipping circuit, pre­emphasized and (VSB on TX418M series) (FM onTX518M/TX618M
series) modulated onto the transmitter RF carrier.

Avalon RF offers the following video indices of modulation
(TX518M/TX618M only):

• Industry standard frequency deviation of 4MHz.

This option offers longer range at reference quality.

• Wide frequency deviation of 6MHz.

This option offers broadcast quality but with shorter range.

1.2 Audio.

The two audio inputs are buffered and FM modulated on two
subcarriers. The factory preset subcarrier frequency is 6.0MHz and

6.5MHz but may be factory programmed to any frequency from

4.8MHz to 7.5MHz.

1.3 RF Output.

The TX618M has a single MMCX RF output with a 50
impedance.

Ω (ohm)