gtcF930218

gtcF930218
Loudspeaking Telephone
GAI-TRONICS®
Features
• Simple Installation
• Simple Operation
• Ease of Service
• Portable
• Battery Operation
• Rugged Construction
• Environment Protected
• Stainless Steel Case
The Loudspeaking Telephone (LST) is a completely self-contained battery-powered communication unit that provides loudspeaker
paging and handset party line conversation
over a twisted telephone line.
Installation and maintenance are simple due to
the single plug-in amplifier board and the battery power supply used in the LST. The mode of
operation is also simple, greatly improving
ambient noise rejection. An anti-side tone
circuit provides improved reception, particularly in areas with high ambient noise, and individual volume controls are provided for the
speaker and handset receiver. The audio is of
high quality; voices sound clear and natural, not
harsh or metallic.
The LST operates from two 12 volt DC batteries
which are placed in parallel during normal
conversation to share on battery drain.
Provisions on the LST unit keep the speakers
quiet when receiving a normal audio signal or
when paging. Input phone line DC polarity
does not have to be observed since the unit
design provides for polarity reversal.
Also available is a single battery Loudspeaking
Telephone, LST II which is fully compatible with
the standard LST and ideal where space is
limited. The LST II offers all of the features of the
two battery unit but requires only one battery.
Typical System Interconnection
There is no practical limit to the number of units which can be connected to the Loudspeaking
Telephone system. The units can be placed miles apart or as close together as a few feet. The type of
wire that is used is not critical; in fact, low cost telephone twist wire ranging from AWG 12 to AWG 19
is suitable. The AWG size is dependent upon the line length of the system and the number of phones
connected to the line. For example, systems up to 1000 feet and containing up to 100 phones will
use AWG 19. The system arrangement need not be on a loop basis, but can include side branches as
required for convenience.
Loudspeaking Telephone
GAI-TRONICS®
Specifications
Electrical
Power Source:
LST: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Two 12 volt DC NEDA 926 batteries or the equivalent
LST II: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . One 12 volt DC NEDA 926 battery or the equivalent
Battery Requirements: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Standby: 0 milliamperes
Speaker Amplifier: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 milliamperes at standby and 250 milliamperes for peak operation
Handset Amplifier: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 milliamperes nominal into 200 ohms (varies with phone lines and number of phones)
Phone Line: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 K ohms at DC, 4.5 K ohms at 1 KHz.
Allows operation of many units on the same phone lines
Paging Voltage:
LST and LST II: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12 volt DC
Paging Sensitivity: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Solid State. Pick up at 2.5 volt DC or greater. Drop out at 2.0 volt DC
Speaker:
LST: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 watt, 8 ohm, Compression Driver
LST II: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 watt, 8 ohm, 4” (102mm) treated water resistant cone
Handset: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Standard handset with sealed push-to-talk; switch and 4 foot coiled cord
Controls:
Speaker Amplifier (POT 1): . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . adjustable to 30 dB
Handset Amplifier (POT 2): . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . adjustable to 30 dB
Output Power:
Speaker Amplifier: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 watts maximum into 8 ohms (clipped)
Handset Amplifier: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 380 milliwatts into 200 ohm load
Short Circuit Paging Current: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Standard Model 0.8 amperes, Permissible Model .35 amperes
Insulation: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 600 volt DC line-to-ground
Carrier Impedance:
Line-to-Line: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 K ohms
Line-to-Ground: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 K ohms
Mechanical
Dimensions:
LST: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.5 (165) W x 16.25 (413) H x 5.56 (142) D; inches (mm)
LST II: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.5 (165) W x 12.38 (315) H x 3.25 (83)D; inches (mm)
Weight:
LST: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 (5.9) without batteries; 3.25 (1.5) per battery; pounds (kg)
LST II: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.38 (4.3) with battery; pounds (kg)
Construction: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . #16 gauge stainless steel
Connection: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Spring loaded push terminals for phone line (2)
Environmental
Moisture: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to 95% humidity with printed circuit board conformal coated
Temperature Range: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -30°C to 60°C
Application
Rig
Models
Mine
Models
Desktop
Model
LST (Two 12 Volt Batteries)
N/A
AM7021*
N/A
LST II (One 12 Volt Battery)
AM7009
AM7011*
AM7030
Note 1: Models marked with an asterisk (*) are MSHA permissible; approval Number 9B-155-0.
Note 2: There are no operational differences between the Rig, Mine LST and Mine LSTII Models; the only variation is the front cover labels,
tailored to the listed industry.
®
GAI-TRONICS
USA
UK
Italy
Malaysia
Australia
Toll Free: 1 (800) 492-1212 Tel: (610) 777-1374 Fax: (610) 796-5954 www.gai-tronics.com
Tel: +44 (0)1283 500500 Fax: +44 (0)1283 500400 www.gai-tronics.co.uk
Tel: +39 02 48601460 Fax: +39 02 93663110 www.gai-tronics.it
Tel: +60-3-8945-4035 / 8945-7348 Fax: +60-3-8945-4675 www.gai-tronics.com
Tel: 011-61-28-851-5000 Fax: 011-61-29-899-2490 www.austdac.com.au
Quality Management System Certified by DNV - ISO 9001:2008. The policy of GAI-Tronics is one of continuous improvement; therefore the company reserves the right to change specifications without notice.
Pub. F930218B Rev 8/2011
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