Uniden BC355N — Vol 2: Operations

2.1 Operating modes

Coverage, per the owner’s manual’s Close Call band table: 25-54 MHz, 108-174 MHz, 406-512 MHz, and 806-956 MHz, with the cellular segments excluded (the 800 MHz band is listed as 806.0000-823.9875, 849.0125-868.9875 and 894.0125-956.0000 MHz). There is no 700 MHz coverage. The 800 MHz segment covers public-safety and business channels but only as conventional analog channels — the radio cannot follow a trunked control channel, so any Motorola Type II, P25, EDACS, or LTR system there will sound like garbled control-channel data or silence.

Modulation: fixed by band, not selectable. The manual’s band plan assigns AM to the aircraft band (108.0000-136.9916 MHz, 8.33 kHz steps) and to the 25.0000-27.9950 MHz CB segment, and NFM to the other bands. A marine frequency saved into a programmable channel is stored in NFM mode.

Channels: 300 programmable channels, one frequency each, in three groups of 100: shared by Police and Fire/EMG, shared by Air and Marine, and the Private bank. There are no alpha tags and no tone squelch; the manual describes neither. Channels can be locked out of scanning, banks can be switched on and off, and HOLD parks the radio on the current channel.

Pre-programmed banks: six service banks held in the radio: Police (1,769 frequencies), Fire/EMG (280), Air (2,280, the whole aircraft band), Marine (90), Weather (7 NOAA frequencies) and CB (40). The manual lists no racing, GMRS/FRS or other service bank. Local frequencies not in these banks, race-team channels included, go into the programmable channels from the front panel.

Band search: 13 searchable bands, selected with BAND. Useful in a new region before local frequencies are programmed: the radio sweeps and stops on activity, and a hit can be stored with HOLD, PROG and a bank key.

Close Call: the standout feature at this price tier. Uniden’s RF-detect mode monitors for strong nearby transmitters across the receive range and auto-tunes to the strongest. The Close Call key cycles through Priority (checks every 2 seconds, with a slight break in audio), Do Not Disturb (checks only when nothing else is being received) and Off; holding the key selects Close Call Only. Useful for “what’s that signal” in unknown RF environments and as a quick discovery tool. Detection bandwidth is wide; false-positives on physically close FM broadcast or paging transmitters.

Squelch: the SQ control on the front panel sets a carrier squelch threshold. The manual describes no CTCSS or DCS tone squelch.

2.2 Field use

Antenna pairing — the single most important upgrade for this radio. The stock BNC stub is a token, not a real antenna. Three good choices by posture:

• Vehicle (the primary use case): NMO mag-mount on the vehicle roof with a BNC-to-NMO adapter (Larsen NMO-150/450 dual-band or similar) feeding the radio over 2-3 m of RG-58 or LMR-240. The roof gives a ground plane equivalent to an infinite radial system; expected gain over the stock stub is 6-10 dB at VHF and 4-8 dB at UHF. See Antennas Vol 9 (Portable & mobile monopoles) and Antennas Vol 29 (Use-case Matrix).
• Desktop / bench: Diamond D-130J or Comet DS-150S discone, rooftop / mast / attic. Wideband, near-omnidirectional, well-suited to the 25-960 MHz coverage. Stock-stub-to-discone delta is on the order of 10-15 dB across most bands.
• Trackside (NASCAR / IndyCar): the stock stub is actually adequate in the pits or grandstands within a few hundred meters of the transmitting handhelds — the trackside posture is the one case where it earns its keep.

Posture: vehicle-mounted backup scanner — always-on while driving, no operator interaction required. Mount the radio under-dash or in the console, run external-speaker audio to the headliner or a side-pillar mount. Wire the 12 V tap to an accessory-switched circuit so the radio powers down with the ignition. Feedline through the firewall via a standard automotive grommet. Once installed, the radio sits there for years; the only reasons to touch it are reprogramming channels for a race weekend or trip, or relocating vehicles.

Receive-only: the BC355N transmits nothing — no Part 95/97/90 envelope. ECPA § 2511 still applies to intentional intercept of cellular and encrypted communications (see Vol 1 §4 ↗ and Vol 4 (Frequency Planning & License Envelope)), but the radio is firmware-blocked from cellular per the Part 15 cellular-block requirement on US-market scanners.

RF environment gotchas:

• Front-end overload in dense urban environments. The BC355N’s superhet front end has limited intermodulation rejection compared to modern SDR scanners. Near a high-power FM broadcast or paging transmitter the radio may go deaf or hear phantom signals. Fix: FM broadcast bandstop filter (~$30) inline between antenna and radio for the worst sites.
• NASCAR pit road frequencies are licensed UHF business band (typically 450-470 MHz block), not amateur or public safety. The race teams hold the licenses; you are listening, not transmitting, so you are clean.
• Mobile installation grounds: tie the radio chassis (via the negative power lead) to the vehicle chassis at a clean point — alternator whine and electrical noise floor can otherwise dominate weak-signal reception.