Radio Shack RF Modulator, 15-1283 Owner's Manual

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OWNER’S MANUAL

Please read before using this equipment.

RF MODULATOR

Cat. No. 15-1283

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Warning: To prevent fire or shock hazar d, do not ex­pose this RF Modulator to rain or moisture.

CAUTION

RISK OF ELECTRIC SHOCK.

DO NOT OPEN.

!

CAUTION

SHOCK, DO NOT REMOVE COVER OR BACK.
NO USER-SERVICEAB LE PARTS INSIDE. REFER
SERVICING TO QUALIFIED PERSONNEL.

!

: TO REDUCE THE RISK OF ELECTRIC

This symbol is intended to alert you to the
presence of uninsulated dangerous voltage
within t he R F Modul at o r’s enc lo su re t ha t mi gh t
be of s uffici ent magni tud e to cons tit ute a risk o f
electric shock. Do not open the RF Modulator’s
case.

This symbol is intended to inform you that im­portant operating and maintenance instruc­tions are included in the literature

©

1995 Tandy Corporation.

All Rights Reserved.

Radio Shack is a registered trademark

used by Tandy Corporation.

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INTRODUCTION

Your Radio Shack RF Modulator is designed to con­vert the separate audio and video signals (from a vid­eo camera, computer, portable VCR, satellite
receiver, etc.) into normal VHF TV si gnals that you
can see on any regular TV set.

THE FCC WANTS YOU TO KNOW

This device complies with Part 15 of FCC Rules. Op­eration is subject to the following conditions:

• This device may not cause harmful interference.

• This device must accept any interference
received, including interference that may cause
undesired operat ion.

Your RF Modulator might cause TV or radio interfer­ence even when it is operating properl y. To determi ne
whether your RF Modulator is causing the interfer­ence, turn i t off . I f the inter ferenc e go es away, your RF
Modulator is causing the interferenc e.

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Try to eliminate the interference by:

• Moving your RF Modulator away from the r eceiver .

• Connecting your RF Modulato r to an outlet th at is on
a differe nt el ectrical circ uit from the receiver.

• Contacting your local Radio Shack store for help.

If you cannot el iminate the int erference, the FCC requires
that you stop using your RF Modulator.

Modifying or tampering with your RF Modulat or’ s internal
components can cause a malfunction and might invali­date the RF Modulator’s warranty and void your FCC au­thorization to operate it. If your RF Modulator is not
performing as i t should, take it to your loc al Radi o Shack
store for assistance.

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PARTS REQUIRED

You need the following items, not supplied with your RF
Modulator, to connect it between a video input source
(video camera, satellite receiver, etc.) and your TV.

• Two audio/video (not stereo) shielded cables with

phono connectors

• Two 75-ohm coaxial cables with F-type connectors

• If your TV does not have a VHF 75-ohm F-connec-

tor, you will also need a 75-ohm-to-300-ohm match­ing transformer

Your local Radio Shack sells a wide selection of each of
these items.

Note to CATV Installer:

This reminder is pro vided t o c all the CAT V sys tem inst al l­er’s attention to article 820-40 of the NEC that provides
guidelines for proper grounding and, in particular speci­fies that the ca ble ground sh all be conne cted to the build ­ing’s groundi ng system, as close as practical t o the point
where the cable enters the house.

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CONNECTIONS

Follow these steps to connect your RF Modulator.

1. Connect an audio/video cable between the video
output jack on your video source and the RF Modu-

VIDEO IN

lator’s

2. Connect another audio/video cable between the
audio output jack on your video source and the RF
Modulator’s

jack.

AUDIO IN

(illus)

jack.

6

(illus)

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3. Connect the 75-ohm coaxi al cables to the RF Modu­lator following these guidelines:

• If your TV is already connected to another VHF

input source (such as cable TV, VCR, etc.):

RF Modulator TV

VHF

Ant In To TV

CATV

75 Ohm 300 Ohms

Disconnect
from here

a. Disconnect the input source’s 75-ohm cable from

the TV’s 75-ohm VHF input terminal, and recon­nect it to the RF Modulator’s

RF Modulator TV

Ant In To TV

Reconnect
here

CATV

ANT IN

terminal.

VHF

75 Ohm 300 Ohms

Add this
cable

b. Then add a 75-ohm coaxial cable connected

between the

TO TV

terminal on the RF Modula-

tor and 75-ohm VHF input terminal on your TV.

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• If your TV is not already connected to another
VHF source:

RF Modulator TV

VHF

Ant In To TV

CATV

75 Ohm 300 Ohms

a.Connect the input source’ s (ant enna, cable TV,

VCR, etc.) 75-ohm cab le to the RF Modulator’s

ANT IN

terminal.

b. Connect a 75-ohm coaxial cable between the

TO TV

terminal on the RF Modulator and the

75-ohm VHF input terminal on your TV.

ote:

N

If your TV has only 300-ohm VHF screw ter­minals, use a 75-ohm-to-300-ohm matching trans­former to complete the connecti on.

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4. Plug the RF Modulator’s power cord into a standard
AC outlet.

(illus)

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OPERATION

1. Turn on the TV and set it to either channel 3 or 4,
whichever of the two is not used for regular broad­casts in your area.

2. Set the RF Modulator’s
same channel you set on the TV (3 or 4).

3. To select the VHF source (cable TV or antenna)
connected to the RF Modulator’s

MOD/ANT

set

to

ANT

To select the audio/video source (VCR or video
camera) connected to the RF Modulator’s

VIDEO IN

terminals, set

CHANNEL 4/3

(illus)

.

MOD/ANT

switch to the

ANT IN

MOD

to

terminal,

AUDIO IN/

.

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Notes:

• The first time you set

MOD/ANT

the input sour ce connected t o the RF Modulator’s

AUDIO IN/VIDEO IN

on the RF Modulator to the position that gives

75

terminals, then set

the best picture.

(illus)

to

MOD,

OHMS 1K/

turn on

• For the best results, try both positions to find the
best setting. Doing so does not harm your equip­ment.

11

(

)

y

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SPECIF ICATIONS

Video Carri er Output Level...................... .........63 dB µV

RF Output Channels.............................................. 3 or 4

RF Output Impedance.......................... .. ..........75 Ohms

Video Input I mp edance .................... 75 Ohms/1 kOhms

Switchable

Audio Input Impedance ............................13 ± 3 kOhms

Specifications ar e typical; individual units might vary. S pecifica­tion s are subject to change and improvement without notice.

This product is warranted against defects for 90 days from date of purchase from
Radio Shack company-owned stores and authorized Radio Shack franchisees and
dealers. Within this period, we will repair it without charge for parts and labor. Sim-

bring your Radio Shack sales slip

pl
Shack store. Warranty does not cover transportation costs. Nor does it cover a
product subjected to misuse or accidental damage.
EXCEPT AS PROVIDED HEREIN, RADIO SHACK MAKES NO EXPRESS WAR­RANTIES AND ANY IMPLIED WARRANTIES ARE LIMITED IN DURATION TO
THE DURATION OF THE WRITTEN LIMITED WARRANTIES CONTAINED
HEREIN. Some states do not permit limitation or exclusion of implied warranties;
therefore, the aforesaid limitation(s) or exclusion(s) may not apply to the pur­chaser.
This warranty gives you specific legal rights and you may also have other rights
which vary from state to state.

RADIO SHACK LIMITED WARRANTY

as proof of purchase date to any Radio

We Service What We Sell

9/94

RADIO SHACK

A Division of Tandy Corporation

Fort Worth, Texas 76102

8A5 Printe d in Chi na