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Documented model specifications
FeaturePresident Randy III+ ↗RemoveSDRplay RSP1B ↗Remove
Model
PurposePortable AM/FM CB radio with ASC automatic squelch.USB SDR receiver covering 1 kHz to 2 GHz for spectrum viewing and signal processing on a computer.
Frequency ranges

Standard frequencies
26.965–27.405 MHz

Frequency range
1 kHz–2 GHz

Modes

Modes
AM / FM

Not documented — see detail page.
Transmit power

Carrier output
4 W AM / 4 W FM

Not documented — see detail page.
ConnectionsNot documented — see detail page.

Antenna
SMA, 50 Ω

USB / current draw
USB 2.0 Type B; 185 mA excluding bias-T load

Power supply

Portable / mobile supply
7.4 V / 13.2 V through designated mobile module

Battery
Li-Ion, 1800 mAh

USB / current draw
USB 2.0 Type B; 185 mA excluding bias-T load

Dimensions and weight

Dimensions, W × H × D
66.5 × 152 × 37 mm

Weight
305 g with battery, without antenna

Enclosure
Steel; 98 × 94 × 35 mm; 315 g

Protection and operating conditionsNot documented — see detail page.Not documented — see detail page.
Highlights
  • AM/FM and selectable country configurations.
  • ASC and manually adjustable squelch.
  • Scan, Dual Watch and priority-channel controls.
  • NRC, ANL/NB and Hi-Cut as documented in the Plus manual.
  • Continuous reception from longwave to 2 GHz.
  • Switched low-pass, band-pass and high-pass preselection filters.
  • Separate rejection filters for mediumwave, FM broadcast and DAB.
  • Software-controlled bias-T supply at the antenna input.
Variants and sourcesFull product dossier →Full product dossier →

How to interpret the differences

BandwidthBandwidth is the width of a frequency range. A receiver filter limits the analysed range; the signal’s occupied bandwidth is a separate quantity.Example & full explanation →SDRIn a Software Defined Radio, software performs key signal-processing tasks such as filtering and demodulation. The analogue front end and converter still determine which signals can be processed.Example & full explanation →DMRDigital Mobile Radio is a family of digital radio standards. Amateur radio commonly uses DMR Tier II; channel configuration includes frequency, colour code, time slot and call destination.Example & full explanation →SimplexIn typical simplex voice operation, stations take turns transmitting and receiving on the same frequency. Only one station can speak intelligibly at a time.Example & full explanation →RepeaterA repeater receives signals and retransmits them. Many voice repeaters use different input and output frequencies; other stations are heard on the repeater output.Example & full explanation →

A wideband receiver and a handheld transceiver serve different purposes. A wider receive range does not automatically mean better sensitivity. Sensitivity depends on mode, measurement bandwidth and criterion, so this comparison does not create an overall ranking.

First check your required mode, then suitable antenna and accessory connections, and finally the power supply. A device’s transmit capability does not establish your personal permission to transmit.

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President Randy III+ →SDRplay RSP1B →