Funcube Dongle Source fcd_source_c Sources 1 from gnuradio import fcd fcd.source_c($device_name) #if $lna() != 20.0 self.$(id).set_lna_gain($lna) #end if #if $mixer() != +12.0 self.$(id).set_mixer_gain($mixer) #end if #if $ppm() != -120 self.$(id).set_freq_corr($ppm) #end if #if ($dci() != 0.0) or ($dcq() != 0.0) self.$(id).set_dc_corr($dci,$dcq) #end if #if ($iq_phase() != 0.0) or ($iq_gain() != 1.0) self.$(id).set_iq_corr($iq_gain,$iq_phase) #end if self.$(id).set_freq($freq) set_freq($freq) set_lna_gain($lna) set_mixer_gain($mixer) set_freq_corr($ppm) set_dc_corr($dci,$dcq) set_iq_corr($iq_gain,$iq_phase) Device Name device_name hw:1 string #if $device_name() then 'none' else 'part'# Frequency (Hz) freq 145500000 real LNA Gain (dB) lna 20.0 real Mixer Gain (dB) mixer +12 real Frequency corr. (ppm) ppm -120 int DC I offset dci 0.0 real DC Q offset dcq 0.0 real IQ phase balance iq_phase 0.0 real IQ gain balance iq_gain 1.0 real ($freq >= 50e6) and ($freq <= 2e9) ($dci >= -1.0) and ($dci <= 1.0) ($dcq >= -1.0) and ($dcq <= 1.0) ($iq_phase >= -1.0) and ($iq_phase <= 1.0) ($iq_gain >= -1.0) and ($iq_gain <= 1.0) out complex This block wraps the Funcube Dongle USB audio input and the USB HID control interface \ into one convenient GNU Radio source block. The sample rate is fixed at 96 ksps. To find the device name on Linux type: cat /proc/asound/cards The LNA gain is a set of discrete values between -5 to 30 dB with 2.5 dB step, but you can \ use any float value and it will be rounded to the nearest valid value. The Mixer gain can be set either to +4 or +12 dB, but you can use any float value \ and it will be rounded to the nearest valid value. The FCD block can autmatically apply frequency correction: - For FCD v1.0 you can leave at -120 ppm - For FCD v1.1 with serial number 810 or greater use -12 ppm The DC offset and IQ balance parameters can have range -1.0 to 1.0.