Technical Appendix Specifications for the RADIO SYSTEM UPGRADE

J. An internal adjustable "squelch" or muting control shall be provided to reduce backgroundnoise of idle channels and amplifier "white-noise" in each headset and speaker. Muting shallreduce noise to a minimum of 60 dB below reference level.K. An adjustable compression point for transmit audio on each position shall be provided.Expansion of audio during pauses in speech shall not cause a perceptible increase inbackground noise.L. A single-action mute control for each unselected channel shall be provided. Muting aspecific channel from one position shall not mute the same channel at other radio controlpositions.M. Each channel shall be equipped with an adjustable threshold control at which the (carrieroperated-switch)COS/BUSY display that will light, or unmute received audio.N. All positions will be capable of accessing the building’s public address system.O. The contractor’s radio workstation shall come with an instant recall recorder function.P. If the offering does not come with an existing instant recall recorder, provisions to control anexisting City GUI-based digital instant-recall recorder (Plant CML Vesta) shall be an integralpart of each radio control. It shall have the following features:Headsets1. Capable of three separate audio channels2. Capable of simultaneous record and playback3. Controls shall be integrated into the radio control panel4. Recorder status shall be displayed on the LCD5. It shall be possible to route the playback audio to the selected, unselected, monitor or adedicated recorder speaker6. Time stamped messages7. Capable of controlling this function on a per-position basis.Both wired and wireless headset access shall be provided for each supplied position.A. A single spare headset jack shall be provided at each radio control position, which will beused as backup. Jacks shall be standard dual 1/4" types (RJ-327 type plug). Insertion of aheadset plug into a jack shall automatically mute the select speaker at that position. Amanual override for this feature shall be provided. Workstations shall have a technicianadjustableside-tone level. Headsets shall operate primarily with radio and intercom systemsas selected by the dispatcher and with telephone systems based on off-hook status of theassociated telephone instrument.B. Headset jacks shall function as 6-wire, with capability of push-to-talk on the headset cord.They shall be also compatible with a 4-wire headset.C. Each position will be equipped with a wireless headset adaptor or base station. This willallow the City to eliminate the headset cords and provide better mobility in the dispatchCity of San Luis Obispo 36 Radio System Upgrade TECHNICAL APPENDIX