RadioShack 14 Channel FRS Base Station 21-1845

From Free Knowledge Base- The DUCK Project: information for everyone
Revision as of 16:29, 29 January 2024 by Admin (Talk | contribs)

Jump to: navigation, search

AC-Powered Intercom 2-Way Personal Radio - 14 Channels (single)

Catalog # 21-1845

RS FRS 21-1845.jpg

This is an A/C powered wireless intercom using the FRS portion of FRS/GMRS radio frequencies.

Features

This unit has 4 channels and 38 different QUIET (CTCSS) codes. If someone else is using the channel you selected and you do not want to hear that person, select another channel, or use the QUIET feature. You can talk with a person who has a FRS radio if both radios are tuned to the same channel and QUIET (CTCSS) code.

Your radio has auto-squelch, which means you will not hear anything on a channel unless someone is transmitting nearby on the same channel. You can turn off auto-squelch to hear weaker, distant transmissions. You can connect an optional speaker/microphone and earphone to the radio. The VOX operation brings you convenient hands-free use.

Specifications

  • RX Frequency: 462-467 MHz
  • Channels: 14
  • Modulation type: FM
  • Antenna impedance: 50 Ohm
  • Microphone: condenser type
  • Power supply: 9 VDC 500mA
  • Sensitivity at 12dB Sinad: 0.5μV
  • Adjacent Channel Rejection: 45dB
  • Audio Squelch: Auto
  • Audio output power: 500mW @ 8 Ohm
  • Audio Distortion: 5%
  • RF Output Power: 500 mW ERP @ 9 VDC
  • Harmonic Emissions: more than 50dB
  • Dimensions (HWD: 36×178×120mm
  • Weight: approx 350g

Setting Channel Frequencies and CTCSS

On the station bottom, you will find two arrays of dip switch. These switches are used to set the channel frequency, and CTCSS code.

Radio Shack calls it Quiet, or QUIET code and what they are referring to is Tone Encoded Squelch (CTCSS or PL Tone). This prevents radio interference from coming though your radio (breaking squelch) unless the radio signal is accompanied by the correct sub audible tone. This is not a scrambling technology, it does not give your conversation any greater privacy against other people listening in with a radio receiver, it just helps keep other radio activity on the frequency from coming through your radio so that you are able to monitor with less noise and interference.

RS21-1845a.gif

Setting for 38 CTCSS Code

The first array of 6-digit dip-switch is used to set 38 CTCSS codes. Please find below table for setting.

RS21-1845b.gif

Setting for Channel Frequencies

The second array of 4-digit dip switch is used to set any one of the 14 channel frequencies. Please find below table for setting.

RS21-1845c.gif

Related

Retrieved from "https://wiki.robotz.com/index.php?title=RadioShack_14_Channel_FRS_Base_Station_21-1845&oldid=22134"