PC-FM6-32 FM Radio Capture PCle Card (6 to 32 Channels)

FM Radcap Capture Card



The FM Radcap PCIe is a radio capture card designed for simultaneous recording of multiple radio stations. The frequency of each station is set in software and its audio appears as a standard Windows audio input device. RDS decoding is also supported.



The card uses a high-speed A/D converter to digitise the entire FM band, with up to 32 individual tuners. The Radcap achieves exceptionally low audio distortion through the use of linear phase filtering and mathematically precise FM demodulation and stereo decoding. FM demodulation and stereo decoding is done in FPGA fabric, while RDS decoding, if enabled, is performed in the driver using the host CPU’s SSE-2 instruction set. This division of labour between the FPGA and driver allows greatest flexibility in catering for future baseband technologies while minimising the CPU overhead of the card.

A WDM driver for Windows XP (SP2 or later), Server 2003, Vista, Server 2008, Windows 7, Server 2008-R2, Windows 8/8.1, Server 2012/2012-R2 and Windows 10 is supplied as well as software for setting the tuner frequencies and monitoring the received audio. A programming API and DLL for software control and monitoring are also supplied.
The card can be configured to operate in stereo, mono or paired mono (two mono stations combined on a 2-channel audio stream) modes. Multiple cards can be used in a single PC, subject to available CPU bandwidth. The audio de-emphasis may also be set to either 50us or 75us. In Australia, New Zealand and Europe 50us is used, while in the USA and Canada 75us is used.

A utility called FMSpectrum is supplied. This displays the RF spectrum from 85MHz to 111MHz, using data from the card’s front-end 256-point FFT and may be useful in selecting the best location for the antenna or resolving interference problems.

The card is factory-configured for 6 (PC-FM6), 12, 18, 24 or 32 (PC-FM32) stations, but may be expanded in the field for an additional charge.

Technical Specification

Technical Specification

Operating Systems Supported

Platform: Windows XP (SP2 or later), Server 2003, Vista, Server 2008, Windows 7, Server 2008-R2, Windows 8/8.1, Server 2012/2012-R2 and Windows 10 (32-bit and 64-bit versions)
Processor: 2.5GHz Pentium 4 or better
Memory: 256 MB minimum (1GB for Vista Windows 7/Server 2008, 2GB for Windows 8/Server 2012)
Bus: Single lane PCI Express v1.1
Other: Sound card or motherboard sound port for monitoring


Tuning Range: 87.5MHz to 108.5MHz in 25kHz steps
Sensitivity: 10uV for 40dB S/N
Maximum Input: 150mV RMS
RF Input Impedance: 75O
De-emphasis: Configurable as 50us or 75us
Audio Distortion: <0.01%
Audio Sampling Rate: 48kHz (all other rates automatically supported via Windows sampling rate converter)
Number of Stations: 6, 12, 18, 24 or 32 (factory configured but end-user expandable)
RDS Decoding: Optionally enabled in driver configuration

Equipment Type

PC-FM6 Radcap FM 6 – 6 channel FM PCIe Radio Capture Card
PC-FM12 Radcap FM 12 – 12 channel FM PCIe Radio Capture Card
PC-FM18 Radcap FM 18 – 18 channel FM PCIe Radio Capture Card
PC-FM24 Radcap FM 24 – 24 channel FM PCIe Radio Capture Card
PC-FM32 Radcap FM 32 – 32 channel FM PCIe Radio Capture Card
PC-FMUP6 Radcap FM 6 Channel Upgrade
PC-FMUP8 Radcap FM 8 Channel Upgrade

Physical Specification

Dimensions (Raw):
14cm (L) x 12.5cm (H) x 2cm (D)
5.5” (L) x 4.9” (H) x 0.8” (D)
Dimensions (Boxed):
27cm (L) x 22.5cm (H) x 6cm (D)
10.6” (L) x 8.9” (H) x 2.4” (D)
Nett: 0.10kg Gross: 0.20kg
Nett: 0.2lbs Gross: 0.4lbs

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