Avocet AV-100 User manual

Operating Manual
Avocet
AV-100
Television Audio Receiver

CAUTION: TO REDUCE THE RISK OF ELECTRICAL SHOCK, DO NOT REMOVE COVER (OR BACK).
NO USER SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.
WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRICAL SHOCK,
DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE.
This symbol, wherever it appears,
alerts you to the presence of uninsulated
dangerous voltage inside the enclosure voltage
that may be sufficient to constitute a risk of shock.
This symbol, wherever it appears,
alerts you to important operating and
maintenance instructions in the accompanying
literature. Read the manual.
IMPORTANT NOTE: Refer to the unit’s rear panel for your Model #.
Model Number: Description:
AV-100 Avocet Television Audio Receiver—main audio program (L+R)
and SAP channel.
Manual:
070.0004.00 AV-100 V 1.00 Operating Manual

!
IMPORTANT SAFETY INSTRUCTIONS
All the safety and operating instructions should be read before the appliance is operated.
Retain Instructions: The safety and operation instructions should be retained for future reference.
Heed Warnings: All warnings on the appliance and in the operating instructions should be adhered to.
Follow Instructions: All operation and user instructions should be followed.
Water and Moisture: The appliance should not be used near water (e.g., near a bathtub, washbowl, kitchen sink, laundry tub, in a wet
basement, or near a swimming pool, etc.).
Ventilation: The appliance should be situated so that its location or position does not interfere with its proper ventilation. For example, the
appliance should not be situated on a bed, sofa, rug, or similar surface that may block the ventilation openings; or, placed in a built-in
installation, such as a bookcase or cabinet that may impede the flow of air through the ventilation openings.
Heat: The appliance should be situated away from heat sources such as radiators, heat registers, stoves, or other appliances (including
amplifiers) that produce heat.
Power Sources: The appliance should be connected to a power supply only of the type described in the operating instructions or as
marked on the appliance.
Grounding or Polarization: Precautions should be taken so that the grounding or polarization means of an appliance is not defeated.
Power-Cord Protection: Power-supply cords should be routed so that they are not likely to be walked on or pinched by items placed
upon or against them, paying particular attention to cords at plugs, convenience receptacles, and the point where they exit from the appliance.
Cleaning: The appliance should be cleaned only as recommended by the manufacturer.
Non-Use Periods: The power cord of the appliance should be unplugged from the outlet when left unused for a long period of time.
Object and Liquid Entry: Care should be taken so that objects do not fall and liquids are not spilled into the enclosure through
openings.
Damage Requiring Service: The appliance should be serviced by qualified service personnel when:
The power supply cord or the plug has been damaged; or
Objects have fallen, or liquid has been spilled into the appliance; or
The appliance has been exposed to rain; or
The appliance does not appear to operate normally or exhibits a marked change in performance; or
The appliance has been dropped, or the enclosure damaged.
Servicing: The user should not attempt to service the appliance beyond that described in the operating instructions. All other servicing
should be referred to qualified service personnel.
The Appliance should be used only with a cart or stand that is recommended by the manufacturer.
Safety Instructions (European)
Notice For U.K. Customers: If Your Unit Is Equipped With A Power Cord.
WARNING: THIS APPLIANCE MUST BE EARTHED.
The cores in the mains lead are colored in accordance with the following code:
GREEN and YELLOW - Earth BLUE - Neutral BROWN - Live
As colors of the cores in the mains lead of this appliance may not correspond with the colored markings identifying the terminals in your plug,
proceed as follows:
The core which is colored green and yellow must be connected to the terminal in the plug marked with the letter E, or with the earth symbol, or
colored green, or green and yellow.
The core, which is colored blue, must be connected to the terminal marked N or colored black.
The core, which is colored brown, must be connected to the terminal marked L or colored red.
The power cord is terminated in a CEE7/7 plug (Continental Europe). The green/yellow wire is connected directly to the unit's chassis. If you need to change the
plug and if you are qualified to do so, refer to the table below.
WARNING: If the ground is defeated, certain fault conditions in the unit or in the system to which it is connected can result in full line voltage between chassis
and earth ground. Severe injury or death can then result if the chassis and earth ground are touched simultaneously.
Conductor WIRE COLOR
Normal Alt
L LIVE BROWN BLACK
N NEUTRAL BLUE WHITE
E EARTH GND GREEN-YELLOW GREEN
AC Power Cord Color Coding

Safety Instructions (German)
Great nor an deer am Leistungsschild vermerkten Spannung und Stromart betreiben.
Sicherungen nur durch solche, gleicher Stromstärke und gleichen Abschaltverhaltens ersetzen. Sicherungen nie überbrücken.
Jedwede Beschädigung des Netzkabels vermeiden. Netzkabel nicht knicken oder quetschen. Beim Abziehen des Netzkabels den
Stecker und nicht das Kabel enfassen. Beschädigte Netzkabel sofort auswechseln.
Gerät und Netzkabel keinen übertriebenen mechanischen Beaspruchungen aussetzen.
Um Berührung gefährlicher elektrischer Spannungen zu vermeiden, darf das Gerät nicht geöffnet werden. Im Fall von Betriebsstörun-
gen darf das Gerät nur Von befugten Servicestellen instandgesetzt werden. Im Gerät befinden sich keine, durch den Benutzer
reparierbare Teile.
Zur Vermeidung von elektrischen Schlägen und Feuer ist das Gerät vor Nässe zu schützen. Eindringen von Feuchtigkeit und
Flüssigkeiten in das Gerät vermeiden.
Bei Betriebsstörungen bzw. nach Eindringen von Flüssigkeiten oder anderen Gegenständen, das Gerät sofort vom Netz trennen und
eine qualifizierte Servicestelle kontaktieren.
Safety Instructions (French)
On s'assurera toujours que la tension et la nature du courant utilisé correspondent bien à ceux indiqués sur la plaque de l'appareil.
N'utiliser que des fusibles de même intensité et du même principe de mise hors circuit que les fusibles d'origine. Ne jamais
shunter les fusibles.
Eviter tout ce qui risque d'endommager le câble seceur. On ne devra ni le plier, ni l'aplatir. Lorsqu'on débranche l'appareil,
tirer la fiche et non le câble. Si un câble est endommagé, le remplacer immédiatement.
Ne jamais exposer l'appareil ou le câble ä une contrainte mécanique excessive.
Pour éviter tout contact averc une tension électrique dangereuse, on n'oouvrira jamais l'appareil. En cas de dysfonctionnement,
l'appareil ne peut être réparé que dans un atelier autorisé. Aucun élément de cet appareil ne peut être réparé par l'utilisateur.
Pour éviter les risques de décharge électrique et d'incendie, protéger l'appareil de l'humidité. Eviter toute pénétration
d'humidité ou fr liquide dans l'appareil.
En cas de dysfonctionnement ou si un liquide ou tout autre objet a pénétré dans l'appareil couper aussitôt l'appareil
de son alimentation et s'adresser à un point de service aprésvente autorisé.
Safety Instructions (Spanish)
Hacer funcionar el aparato sólo con la tensión y clase de corriente señaladas en la placa indicadora de características.
Reemplazar los fusibles sólo por otros de la misma intensidad de corriente y sistema de desconexión. No poner nunca los fusibles en
puente.
Proteger el cable de alimentación contra toda clase de daños. No doblar o apretar el cable. Al desenchufar, asir el enchufe y no el
cable. Sustituir inmediatamente cables dañados.
No someter el aparato y el cable de alimentación a esfuerzo mecánico excesivo.
Para evitar el contacto con tensiones eléctricas peligrosas, el aparato no debe abrirse. En caso de producirse fallos de funcionamiento,
debe ser reparado sólo por talleres de servicio autorizados. En el aparato no se encuentra ninguna pieza que pudiera ser reparada por
el usuario.
Para evitar descargas eléctricas e incendios, el aparato debe protegerse contra la humedad, impidiendo que penetren ésta o líquidos
en el mismo.
En caso de producirse fallas de funcionamiento como consecuencia de la penetración de líquidos u otros objetos en el aparato,
hay que desconectarlo inmediatamente de la red y ponerse en contacto con un taller de servicio autorizado.
Safety Instructions (Italian)
Far funzionare l'apparecchio solo con la tensione e il tipo di corrente indicati sulla targa riportante i dati sulle prestazioni.
Sostituire i dispositivi di protezione (valvole, fusibili ecc.) solo con dispositivi aventi lo stesso amperaggio e lo stesso comportamento
di interruzione. Non cavallottare mai i dispositivi di protezione.
Evitare qualsiasi danno al cavo di collegamento alla rete. Non piegare o schiacciare il cavo. Per staccare il cavo, tirare la presa e mai
il cavo. Sostituire subito i cavi danneggiati.
Non esporre l'apparecchio e il cavo ad esagerate sollecitazioni meccaniche.
Per evitare il contatto con le tensioni elettriche pericolose, l'apparecchio non deve venir aperto. In caso di anomalie di funzionamento
l'apparecchio deve venir riparato solo da centri di servizio autorizzati. Nell'apparecchio non si trovano parti che possano essere riparate
dall'utente.
Per evitare scosse elettriche o incendi, l'apparecchio va protetto dall'umidità. Evitare che umidità o liquidi entrino nell'apparecchio.
In caso di anomalie di funzionamento rispettivamente dopo la penetrazione di liquidi o oggetti nell'apparecchio, staccare immediatamente
l'apparecchio dalla rete e contattare un centro di servizio qualificato.

Operating Manual
Avocet
AV-100
Television Audio Receiver
This manual is part number 070.0004.00
Copyright 2001
Circuit Research Labs, Inc.
2522 West Geneva Drive
Tempe, Arizona 85282-3192 U.S.A.
[phone] ♦[phone]
Fax [phone]
E-mail: [e-mail]
Internet: www.crlsystems.com

CIRCUIT RESEARCH LABS, INC.
PLEASE READ BEFORE PROCEEDING!
Manual
The Operating Manual contains instructions to verify the proper operation of this unit and initialization of certain options. You will
find these operations are most conveniently performed on the bench before you install the unit in the rack.
Please review the Manual, especially the installation section, before unpacking the unit.
Trial Period Precautions
If your unit has been provided on a trial basis:
You should observe the following precautions to avoid reconditioning charges in case you later wish to return the unit to your dealer.
Note the packing technique and save all packing materials. It is not wise to ship in other than the factory carton. (Replacements cost
$35.00).
(1) Avoid scratching the paint or plating. Set the unit on soft, clean surfaces.
(2) Do not cut the grounding pin from the line cord.
(3) Use care and proper tools in removing and tightening screws to avoid burring the heads.
(4) Use the nylon-washered rack screws supplied, if possible, to avoid damaging the panel. Support the unit
when tightening the screws so that the threads do not scrape the paint inside the slotted holes.
Packing
When you pack the unit for shipping:
(1) Tighten all screws on any barrier strip(s) so the screws do not fall out from vibration.
(2) Wrap the unit in its original plastic bag to avoid abrading the paint.
(3) Seal the inner and outer cartons with tape.
If you are returning the unit permanently (for credit), be sure to enclose:
• The Manual(s)
• The Registration/Warranty Card
• The Line Cord
• All Miscellaneous Hardware (including the Rack Screws and Keys)
• The Extender Card (if applicable)
Your dealer may charge you for any missing items.
If you are returning a unit for repair, do not enclose any of the above items.
Further advice on proper packing and shipping is included in the Manual (see Table of Contents).
Trouble
If you have problems with installation or operation:
(1) Check everything you have done so far against the instructions in the Manual. The information contained
therein is based on our years of experience with products and broadcast stations.
(2) Check the other sections of the Manual (consult the Table of Contents and Index) to see if there might be
some suggestions regarding your problem.
(3) After reading the section on Factory Assistance, you may call CRL Customer Service for advice during
normal Arizona business hours. The number is [phone].

TABLE OF CONTENTS
PRODUCT DESCRIPTION 1
SETUP 2
CONTROLS AND INDICATORS 3
Front Panel 3
Rear Panel 3
Internal Controls 4
Jumper Settings 5
CALIBRATION PROCEDURE 6
INSTRUMENT SPECIFICATIONS 7
WARRANTY 8

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AVOCET AV-100 1
PRODUCT DESCRIPTION
The AV-100 is a television audio receiver that can be tuned to a television station to
receive either its main audio program (L+R) or its SAP channel. The receiver is
designed for portable, mobile or rack-mounted usage.
Figure 1 - Front Panel
AVOCET AV-100
TELEVISION AUDIO RECEIVER
Power Main SAP
INSTRUMENTS
Figure 2 - Rear Panel
AVOCET INSTRUMENTS, INC. BEAVERTON, OR MADE IN U.S.A.
SAP OUT
ADJUST
SAP OUT
ADJUST
COMPOSITE AUDIO IN
(50 OHMS)
COMP/TUNER
ANTENNA IN POWER IN
(75 OHMS) (+12 VDC)
The product incorporates features enabling a variety of applications, offering
outstanding versatility for the user.
• Quality audio sound: The AV-100 incorporates balanced, line-level audio outputs
that use XLR connectors for both Main and SAP channels. The audio specifications
are exceptional for an off-air receiver, and are well suited for professional
applications.
• All VHF and UHF channels: The receiver is frequency agile, able to receive all
standard North American off-air television channels, 2 through 69.
• Professional rack mountable package: The rack mount packaging of the AV-100
makes it easy to work with in professional broadcast environments. The attractive
painted steel case gives protection to the circuitry, and aids in isolating the receiver
from stray RF radiation.

AVOCET AV-100 2
SETUP
The AV-100 is shipped ready to operate with the exception of the antenna, power and
audio connections and channel selection.
Antenna Hook Up:
The antenna input on the AV-100 is an F-type (75 Ω) connector, and is located on the
rear of the AV-100. Your on-air house feed or a suitable antenna should be connected
here.
Power Hook Up:
Power to the AV-100 is supplied via a power adapter. Plug the adapter into a 120 VAC
standard wall socket, and plug the other end into the power input socket on the rear
panel (figure 2, page 1).
Channel Selection:
To set the AV-100 to your desired on-air channel, proceed as follows.
1. Ensure that the power adapter has been unplugged.
2. Remove the five Phillips-head screws holding down the top cover; remove the cover.
3. Set the dip switch S1 to the binary equivalent of the channel number. A table of
channel settings is found on a chart inside the unit and on page 4 of this manual.
4. Replace the cover and connect the power adapter.
SAP Channel Hook Up:
To utilize the SAP channel from the 600 Ω, balanced rear panel output, simply connect
a female XLR to the male XLR connector on the rear of the AV-100. Use the rear panel
adjustment control to set the proper level.
Main Channel Hook Up:
To utilize the Main channel from the 600 Ω, balanced rear panel output, simply connect
a female XLR to the male XLR connector on the rear of the AV-100. Set the proper
level via the rear panel adjustment control.

AVOCET AV-100 3
CONTROLS AND INDICATORS
Front Panel:
There are three LED indicators on the front panel of the AV-100. Their functions are
described below.
Figure 3 - Front Panel LED Indicators
Power Main SAP
Power Indicates that power has been applied to the AV-100.
Main Shows that audio is present on the Main channel. Intensity
of the LED should fluctuate with the audio level.
SAP Shows that audio is present on the SAP channel. Intensity
of the LED should fluctuate with the audio level.
Rear Panel:
Power In The AC/DC power adapter is connected here. Only the 12
VDC, 500 mA adapter shipped with the unit is to be used.
Use of an incorrect power adaptor could cause damage to
the unit.
Antenna In This port provides connection for the receive antenna.
Connection is made with an F-type connector at 75 Ω.
SAP-Out Balanced audio output at 600 Ωis provided via a male
XLR connector. The output level can be modified by
turning the adjustment pot next to the connector on the

AVOCET AV-100 4
rear panel (see figure 2, page 1). The level range is
approximately +10 to -10 dBm.
Main-Out Same as SAP-Out, but carries Main channel audio.
Adjust These two controls adjust the output level of the rear panel
SAP and Main outputs.
Internal Controls:
Channel Selector Channel selection is made from an eight-position dip
switch located on the receiver circuit board. Channels are
assigned as follows:
0=Switch Closed (ON), 1= Switch Open (OFF)
Table 1 - Channel Selector Codes
Ch 12345678 Ch 12345678 Ch 12345678
24 00011000 47 11110100
2 01000000 25 10011000 48 00001100
3 11000000 26 01011000 49 10001100
4 00100000 27 11011000 50 01001100
5 10100000 28 00111000 51 11001100
6 01100000 29 10111000 52 00101100
7 11100000 30 01111000 53 10101100
8 00010000 31 11111000 54 01101100
9 10010000 32 00000100 55 11101100
10 01010000 33 10000100 56 00011100
11 11010000 34 01000100 57 10011100
12 00110000 35 11000100 58 01011100
13 10110000 36 00100100 59 11011100
14 01110000 37 10100100 60 00111100
15 11110000 38 01100100 61 10111100
16 00001000 39 11100100 62 01111100
17 10001000 40 00010100 63 11111100
18 01001000 41 10010100 64 00000010
19 11001000 42 01010100 65 10000010
20 00101000 43 11010100 66 01000010
21 10101000 44 00110100 67 11000010
22 01101000 45 10110100 68 00100010
23 11101000 46 01110100 69 10100010
Figure 5 - Channel selector switch set for channel 5
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Off
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On
1 2 3 4 5 6 7 8

AVOCET AV-100 5
Jumper Settings Only one jumper is located on the circuit board. This
jumper is used for production testing and field calibration.
The proper positioning for this jumpers is as follows:
Composite Bypass Jumper JU1 is used during production testing or
calibration to disconnect the tuning circuit from the
remainder of the audio circuitry. This is done in order to
inject test signals into the audio circuitry. Normally, the
user would not move this jumper, but in special cases,
this jumper can be used when a composite input is
needed in the AV-100. Contact the factory for
additional support on this application.
JU1 - Composite Bypass
1 2 1-2 Normal operation *
3 4 3-4 Factory Use only
*=as shipped from factory

AVOCET AV-100 6
CALIBRATION PROCEDURE
Verify that the power is on by checking that the front panel POWER ON light is lit.
Set SAP Channel Demod:
Move the shorting block on jumper JU1 from position 1-2 to position 3-4. This will
disconnect the audio signal coming out of the tuner module from the signal path, and
will let the SAP demod circuit free-run.
Connect a frequency counter to either side of C41. The frequency counter should
measure 78.6 kHz (±0.2 kHz). If necessary, adjust R51 (VCO ADJUST) until a
frequency of 78.6 kHz is measured. Restore JU1 to the 1-2 position to reconnect the
tuner module output.

AVOCET AV-100 7
INSTRUMENT SPECIFICATIONS
Frequency Range: 54-806 mHz. Channels 2-69 (selectable via internal switch)
Input Signal Sensitivity: 250 µV
Input Signal Selectivity: 65 dB alternate channels
Dynamic range: 60 dB (typical)
Antenna Connector: F-type, female (75 Ω)
Receiver SNR: Better than -40 dB @ 100% modulation
THD: Better than 2.0 %
Audio Frequency Range: 100 Hz to 10 kHz, ± 3 dB
Companding Expansion: Custom
Front Panel:
• Power LED indicator
• SAP channel audio LED indicator
• Main channel audio LED indicator
Rear Panel:
• SAP-Out balanced XLR (male) with level set adjustment
• Main-Out balanced XLR (male) with level set adjustment
• Antenna input: F-type (75 Ω) connector
• Composite audio input: BNC (50 Ω)
• Composite audio/tuner selector switch
• 12 VDC power input: 5.5 mm x 2.5 mm, center pin positive (+)
Power: 12 VDC or 100-120 VAC, 60 Hz with the supplied external power supply
Size: 19" wide, 1.75" high, 6" deep
Weight: 2.0 lbs.

AVOCET AV-100 8
WARRANTY
United States Warranty
Limited Warranty
Valid only in the United States. We warrant Circuit Research Labs products against
defects in material or workmanship for a period of one year from the date of original
purchase for use, and agree to repair or, at our option, replace any defective item without
charge for either parts or labor.
Important: This warranty does not cover damage resulting from accident, misuse or
abuse, lack of reasonable care, the affixing of any attachment not provided with the
product, loss of parts, or connecting the product to any but the specified receptacles. This
warranty is void unless service or repairs are performed by an authorized service center.
No responsibility is assumed for any special, incidental or consequential damages.
However, the limitation of any right or remedy shall not be effective where such is
prohibited or restricted by law.
Simply take or ship your Circuit Research Labs product prepaid to our service
department. Be sure to include your sales slip as proof of purchase date. (We will not
repair transit damage under the no-charge terms of this warranty). Circuit Research Labs
will pay return shipping.
Note: No other warranty, written or oral is authorized for Circuit Research Labs products.
This warranty gives you specific legal rights, and you may also have other rights, which
vary from state to state. Some states do not allow the exclusion of limitations of
incidental or consequential damages or limitations on how long an implied warranty lasts,
so the above exclusion and limitations may not apply to you.
International Warranty
Warranty Conditions
Circuit Research Labs warrants Circuit Research Labs products against evident defects in
material and workmanship for a period of one year form the date of original purchase for
use. This warranty does not cover damage resulting from misuse or abuse, or lack of
reasonable care, and inadequate repairs performed by unauthorized service centers.
Performance of repairs or replacements under this warranty is subject to submission of
this Warranty/Registration Card, completed and signed by the dealer on the day of
purchase, and the sales slip. Shipment of the defective item for repair under this warranty
will be at the customer’s own risk and expense. This warranty is valid for the original
purchaser only.