Radio Shack Video RF Modulator User manual

Cat. No. 15-1273C
OWNER’S MANUAL
Please read before using this equipment.
RF MODULATOR
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INTRODUCTION
Your Radio Shack RF Modulator is designed to con-
vert the separate audio and video signals (from a vid-
eocamera, computer,portableVCR, satellite receiver,
etc.) into normal VHF TV signals that you can see on
any regular TV set.
You can use the RF Modulator by connecting it be-
tween your TV and your:
• Video camera (for security surveillance or for
watching a child’s play area)
• Home satellite receiver
©1995 Tandy Corporation.
All Rights Reserved.
Radio Shack is a registered trademark
used by Tandy Corporation.
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Warning: To prevent fire orshock hazard, do not ex-
pose this system to rain or moisture.
This symbol is intended to alert you to the
presence of uninsulated dangerous voltage
within the system’s enclosure that might be of
sufficient magnitude to constitute a risk of elec-
tric shock. Do not open the system’s case.
This symbol is intended to inform you that im-
portant operating and maintenance instruc-
tions are included in the literature
accompanying this system.
RISK OF ELECTRIC SHOCK.
DO NOT OPEN.
CAUTION: TO REDUCE THE RISK OF ELECTRIC
SHOCK, DO NOT REMOVE COVER OR BACK.
NO USER-SERVICEABLE PARTS INSIDE. REFER
SERVICING TO QUALIFIED PERSONNEL.
CAUTION !
!
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Your RF Modulator might cause TV or radio interfer-
ence even when it is operating properly. To determine
whether your RF Modulator is causing the interfer-
ence, turn off your RF Modulator. If the interference
goes away, your RF modulator is causing the interfer-
ence. Try to eliminate the interference by:
• Moving your RF Modulator away from the
receiver
• Connecting your RF Modulator to an outlet that is
on a different electrical circuit from the receiver
• Contacting your local Radio Shack store for help
If you cannot eliminate the interference, the FCC re-
quires that you stop using your RF Modulator.
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PREPARATION
ADDITIONAL 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
• One 75-ohm coaxial cable with F-type connec-
tors
• If your TV does not have a VHF 75-ohm F-con-
nector, 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.
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CONNECTIONS
Follow these steps to connect your RF Modulator.
1. Connect one of the audio/video cables between
the video output jack on your video source and
the RF Modulator’s VIDEO INPUT jack.
2. Connect the other audio/vidoe cable between the
audio output jack on your video source and the
RF Modulator’s AUDIO INPUT jack.
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3. If your TV is already connected to another VHF
input source:
a. Disconnect the input source’s 75-ohm cable
from the TV’s 75-ohm VHF input terminal,
and reconnect it to the Ainput terminal on the
supplied Hi-Isolation A/B switch.
b. Connect the supplied 75-ohm short cable
between the Binput terminal on the Hi-Isola-
tion switch and the RF Modulator’s RF OUT
terminal.
c. Connect the 75-ohm coaxial cable between
the OUT terminal on the Hi-Isolation switch
and 75-ohm VHF input terminal on your TV.
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If your TV is not already connected to another
VHF source (antenna, cable TV, VCR, etc.), con-
nect the 75-ohm coaxial cable directly between
the RF OUT terminal on the RF Modulator and the
75-ohm VHF terminal on your TV.
Note: If your TV has only 300-ohm VHF screw
terminals, use a 75-ohm-to-300-ohm matching
transformer to complete the connection.
4. Plug the RF Modulator power cord into a stan-
dard AC outlet.
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OPERATION
1. Set the RF Modulator’s CHANNEL 3/4 switch to
the channel that is not used for regular broad-
casts in your area.
2. Turn on the TV and set it to the same channel (3
or 4) as the channel switch on the RF Modulator.
Note: If you connected a Hi-Isolation A/B switch,
set it to the B input position.
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3. Turn on the input source (camera, etc.) and set
OHMS 1K/75 on the RF Modulator to the position
that gives the best picture.
Note: For the best results, try both positions to
find the best setting. Doing so does not harm
your equipment.
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SPECIFICATIONS
Video Carrier Output Level...........................63 dB µV
RF Output Channels..........................................3 or 4
RF Output Impedance ..................................75 Ohms
Video Input Impedance........................75 or 1 kOhms
(switchable)
Audio Input Impedance.........................13 ± 3 kOhms
Specifications are typical; individual units might vary.
Specifications are subject to change and improvement
without notice.
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RADIO SHACK
A Division of Tandy Corporation
Fort Worth, Texas 76102
3A5 Printed in China
RADIO SHACK LIMITED WARRANTY
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-
ply bring your Radio Shack sales slip as proof of purchase
date to any Radio Shack store. Warranty does not cover trans-
portation 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 warrant
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We Service What We Sell
9/94
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