FlexRadio SDR-1000

Headless HF/VHF Transceiver

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The SDR-1000 was introduced in 2003 and at the time was the first open source Software Defined Radio (SDR) transceiver in the world. The little black box's primary function is to convert RF to a 11 KHz Quadrature (I/Q) AF signal for receive functions and to convert a 11 KHz quadrature AF signal to RF and to amply that signal to 100 watts PEP. Everything else is done in software. The SDR-1000 is controlled via a PC Parallel Port (DB-25 connector) or optional USB-parallel adapter.

Every SDR-1000 comes with PowerSDR software that performs all DSP and control functions for the radio. The software is provided open source under the GNU General Public License (GPL). This means that customers have the ability to improve performance and add functionality to the radio with redistribution rights defined under GPL.

PowerSDR features:
· Real-time Panadapter and Waterfall Spectrum Displays of
the passband
· User defined “On the Fly” drag and set Filter Setting
· Brick wall filters down to 25 Hz with no ringing
· Zero beat click tuning of signals in the Panadapter
· Advanced digital AGC performed after the filter
· DSP Noise Reduction, Noise Blanking (2) and Notch Filter
· Digital EQ, Compression, Compander and variable transmit
bandwidth filters for the ultimate SSB and AM experience
· Integrated CAT for use with any logging or contest software
· Built-in Iambic keyer and automatic zero beat for CW
· Full Split operation with MultiRX makes working DX a breeze
· All mode (SSB, CW, AM, FM, SAM & DRM) with multiple
bandstack registers and memories
· Virtually unlimited memory channels

Frequency range

0.012-60 MHz
160-6m (2m optional)
HAM bands
160m  80m  60m  40m  30m (WARC)  20m  17m (WARC)  15m  12m (WARC)  11m (CB)  6m  2m 
Tuning steps
0.001 kHz
Software controlled


AM   N-FM   CW   USB   LSB   DSB  
Receiver system
Image rejection
Audio output
Line in / Line out / Mic in/out


AM   N-FM   CW   USB   LSB   DSB  
HF: 100W (CW: 40W), 6m: 500mW




Power requirements
13.8V DC
Current drain RX
25A max


Dimensions (w×h×d)
241 × 254 × 114 mm (9.49 × 10.00 × 4.49 in)
Form factor
Between 2003 and 2007 in USA

Other features

100000 channels in 1 bank(s)
Amateur / Ham radio operators
Features + options
SDR (Software Defined Radio)

Manuals, diagrams and brochures

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Reviews & stories

Fantastic product in it's time

FlexRadio SDR-1000, Headless HF/VHF Transceiver

Purchased this radio in 2006 and have used it almost every day since. The evolution of the software has been absolutely amazing. With each iteration it's like getting a new radio. It takes a certain type of ham to want a radio like this. Even today some hams refuse to get used to a radio that has no knobs. Setting up the radio is quite involved but is totally worth it. The transmit audio is superb. I constantly receive unsolicited compliments on the audio quality. Be advised that this radio will not work with the newest computers as it requires a parallel port and works best with Windows XP. There is a parallel to USB adapter that requires XP or Vista but these are difficult to find. If you come across one with all cables and the required sound card at a good price and you like to tinker and experiment then give it a try. This radio is the most fun of any radio I've owned.

Build quality
User friendlyness
Value for money
Mint condition in 2014
USD 0.00

SDR-1000 An oldie but also a goodie!

FlexRadio SDR-1000, Headless HF/VHF Transceiver

I purchased my SDR-1000 twelve years ago in 2003 just after they were announced. I assembled the pieces, including the 100W transmitter, in the metal box supplied. I use an M-Audio sound card. My computer is currently a Lenovo Pentium 4 desktop running XP. The only difficulty I encountered was RF feedback from the transmitter which I fixed by putting ferrite sleeves around all of the cables. This has been a super radio. Outstanding rejection of adjacent channels through the use of digital "brick wall" filters. The SDR-1000 receiver is very sensitive compared to an ICOM IC-728 or IC-707.
While newer Flex Radios get rid of a lot of cables, I am sticking with my SDR-1000 as it is a great rig despite its age.

Written by fhh11 on Apr 3, 2015

Build quality
User friendlyness
Value for money
Mint condition in 2003
USD 0.00

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