LR-500 Specifications
Architectural Specifications
The FM reciever shall be capable of receiving on 57 wide and narrow band channels with a SNR of 80dB or greater. The receiver shall be programmable to electronically lock out unneeded channels. The receiver shall be capable of seeking channels. The device shall have an adjustable squelch. The device shall have an audio frequency response of 63 Hz to 15 KHz, ± 3dB at 72 MHz, or 63 Hz to 10 KHz, ±3dB at 216 MHz. The device will incorporate a stereo headset jack that allows the user to plug in either a mono or stereo headset. The device shall incorporate an LCD display that indicates channel, channel lock or lock status, battery level, battery charging, and RF signal strength. The receiver shall incorporate automatic battery charging circuitry for recharging of NiMH batteries. The Listen
Specifications
| Specification |
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| RF Frequency Range |
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| Number of Channels |
| 57 (17 wide, 40 narrow) | 57 (19 wide, 38 narrow) | |
| Sensitivity |
| .6uV typical, 1 uV maximum for 12dB | SINAD | |
RF | Frequency Accuracy |
| ± .005% stability 32 to 122º F (0 to 50º C) | ||
Antenna |
| Uses earphone cable |
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| Antenna Connector |
| 3.5 mm connector |
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| Squelch |
| Programmable in 20 steps |
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| Compliance |
| FCC Part 15, Industry Canada |
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| ** All system specifications are wireless | |||
| System Frequency Response |
| 63 | 63 | |
| System Signal to Noise Ratio | SQ™ enabled: 80dB; | SQ™ enabled: 80dB; | ||
Audio |
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| SQ™ disabled: 60dB | SQ™ disabled: 50dB | |
System Distortion |
| < 2% total harmonic distortion (THD) at 80% deviation | |||
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| Output |
| 3.5 mm connectors, unbalanced, 0dBu nomial output level, 16mW maximum, | ||
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| impedance 32 Ohms |
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| Set Up Controls | Programmable channel selection (see below), alkaline/NiMH batteries and squelch, | |||
| SQ™ enable/disable |
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| User Controls | Volume, channel UP/DOWN/SEEK. All controls except volume are electronically | |||
Controls | lockable |
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| Unit can be programmed so that only desired channels are displayed. Squelch can be | |||
| Programming | adjusted for sensitivity and signal capture control. Channel selection can be locked by | |||
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| holding the SEEK button for 5 seconds. |
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| LCD Display | Indicates channel, RF signal strength, lock status, squelch, battery power level and | |||
| channel programming |
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Indicators |
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LED | Red, illuminates when unit is on. Flashes when batteries are low. Flashes when charg- | ||||
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| ing. Flashes when locked and user attempts to seek to another channel. | ||||
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| Battery Type | Two AA batteries, alkaline or NiMH |
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| Battery Life (Listen batteries) | 30 hours alkaline | |||
Power | Battery Charging (NiMH only) | Fully automatic, 14 hours |
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Power Supply Connector | 2.3 mm OD by 0.7 mm ID, barrel type connector. 7.5VDC, center positive <250mA. | ||||
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| Drop in contact points for use with Listen charging cases | ||||
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| Compliance | UL Listed |
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| Dimensions W x D x H | 3.0 x 1.0 x 4.25 in. (7.6 x 2.5 x 13 cm) |
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| Unit Weight | 3.9 oz. (111 g) |
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Physical | Unit Weight with batteries | 5.8 oz. (164.4 g) |
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Shipping Weight | 1.0 lbs. (453.6 kg) |
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| Door | Manually lockable. UP, DOWN and SEEK through door, other controls behind door | |||
| (see Controls above) |
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| Temperature - Operation | 14 to 104º F (10 to 40º C) |
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Environmental | Temperature - Storage |
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| Humidity | 0 to 95% relative humidity, |
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