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The Entry Level QPR Software Defined Radio and Ideal IF Deck for VHF-Microwave Operation

Discontinued. Browse our selection of other great radios >>

The FLEX-1500™ is a low-cost, low-wattage SDR that is positioned to allow ham radio operators the ability to experience the incredible capabilities and just plain fun of operating a software defined radio without breaking the budget.  The FLEX-1500 is packed with features that make it ideally positioned to be the ultimate low cost, high performance IF deck for VHF-microwave transverter operation.  With ongoing improvements and upgrades provided by PowerSDR, the FLEX-1500 is by far the best value of any entry level amateur radio available today.

FLEX-1500 Feature Highlights

  • 5W nominal QRP power amp, 160-6m
  • All band and all mode transceiver with general coverage receive
  • Internal high performance 16-bit A/D and D/A converters (no sound card required)
  • Designed specifically as an IF for transverter use
  • Separate receive antenna port
  • 4th order band pass filters for out of band signal rejection
  • ± 2.5 ppm TCXO for stable frequency operation
  • 10 MHz input for an external high stability clock source
  • High gain RF pre-amplifiers for increased sensitivity
  • Light weight and small footprint designed for portability (4” x 7” x 2.4”)
  • Connects to the PC using a USB v1.1 interface
  • MARS/CAP capable (requires license)
  • RoHS compliant manufacturing

Receiver Specifications:

  • Architecture: Direct conversion, quadrature down-sampling to baseband
  • ADC Sampling Rate: 48 ksps
  • ADC Resolution: 16-bit@48 ksps, 20 kHz bandwidth
  • ADC Dynamic Range: 92dBA
  • Rx Frequency Range: 490 kHz - 54 MHz (operating below 490 kHz requires external, customer provided filters to eliminate images); 160 - 6m (specified performance in amateur bands only)
  • MDS: MDS (typ)@ 500Hz BW; Preamp OFF@14MHz is -116 dBm; Preamp +20dB@14MHz is -127 dBm; Preamp +30dB@50MHz is -138 dBM
  • IMD DR3 (dynamic range): 86 dB@14 MHz with 2 kHz or less tone spacing
  • IP3: +21 dBm@14 MHz with preamp off at 2 kHz or less tone spacing (S5 IM3 method)
  • IP2: +71dBm with preamp off at 2kHz at 2 kHz spacing
  • Selectivity (-6 /-60 dB): CW 500 Hz: 500/640; SSB 2.4 kHz: 2.39/2.54; AM 6.6 kHz: 6.60/6.74; (at 48 ksps/2048 Buffer Length)
  • Image Rejection: >100 dB with Wide Band Image Rejection Active

Transmitter Specifications:

  • Transmitter Frequency Range: 160 - 6m (amateur bands only)
  • Power Output: 5 watts nominal PEP CW and SSB at 13.8vDC input voltage; 5 Watts nominal PEP AM = 3.3 Watts nominal AM
  • Transverter IF Output Power: +0dBm Typical, +5 dBm max.
  • Emission Modes Types: A1A (CWU, CWL), J3E (USB, LSB), A3E (AM), F3E (FM), DIGITAL (DIGU, DIGL)
  • Harmonic Radiation: Better than -48 dB (160 - 10m amateur bands); Better than -60 dB (6m amateur band)
  • SSB Carrier Suppression: At least 55 dB below peak output
  • Undesired Sideband Suppression: At least 55 dB below peak output
  • Audio Response (SSB): Flat Response 20 Hz to 20 kHz, 3-band or 10-band Software Equalizer
  • 3rd-Order IMD: Better than -33 dB below PEP @ 14.2 MHz 5 Watts PEP
  • Microphone Impedance: 600 Ohms (unbalanced)
  • FlexWire Audio Line-In and Line-Out Impedance: 1000 Ohms

General Specifications:

  • Frequency Stability: +/- 2.5 ppm TCXO std. 32F to 122F (0C to +50C); Optional input for external 10 MHz standard reference
  • DDS Clock Frequency: 384 MHz
  • Emission Modes: A1A (CW), A3E (AM), J3E (LSB, USB), F3E (FM), F1B** (RTTY), F1D** (PACKET), F2D** (PACKET)
  • Frequency Steps: 1Hz minimum
  • Number of Memory Channels: Unlimited
  • Antenna Connectors: BNCx1, XVRx1, XVTRx1
  • Antenna Impedance: 50 Ohms, unbalanced; Rx Optimal
  • Maximum Interconnect Cable Length: Complies with USB 1.1 (not to exceed 5 meters)
  • CE Compliance Cable Requirements: 1 snap on ferrite bead on USB cable (supplied); Bead to be located adjacent to radio connection


  • Power Requirements: +13.8V DC nominal ±15% (Transmitter output specified at 13.8VDC)
  • Power Consumption: Rx 400mA (typ.); Tx (5W) 1.8A (max)


  • Height: 2.4" (6.1cm)
  • Width: 4.0" (10.2cm)
  • Depth: 7.0" (17.8cm)
  • Weight: Approximately 1.5 lbs (0.68kg)
  • Operating Temperature: 14 to 122 degrees F (-10 degrees Celsius to +50 degrees Celsius)

Specifications are subject to change without notice.
** Requires 3rd party software.

flex radio

flexradio flex-1500

Package Includes:
• FLEX-1500 Transceiver
USB Cable (6 feet)
Unterminated Power Cable (4 feet)
• PL259/BNC adapter
• Quick Start Guide

CD ROM/USB Flash Drive with Owner's manual, Quick Start Guide, PowerSDR
2.0 or later, FlexRadio Installer

pdf Block Diagram
pdf Quick Start Guide
pdf Owner's Manual
pdf Service Manual








flex 1500



flex 1500

FLEX-1500 6m SDR Tranceiver

tuning knob

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