RTL-SDR Direct mode Q minimum frequency error #RTL #spyserver


Marco Johansson
 

Hi,

I just updated my system with the latest Spyserver and SDR# and it seems I lost the ability to tune SDR# under 1MHz.

I use RTL-SDR Nooelec dongle with Direct sample mode (Q) and was able to tune down to DC with previous Spyserver version.

Any idea what could cause this error with the latest SpyServer?

Attached my config.

-Mac

----------

# SPY Server Configuration File

 

# TCP Listener

#

bind_host = 0.0.0.0

bind_port = 5559

 

# User sessions

#

maximum_clients = 10

 

# Maximum session duration

# In minutes. 0 for no limit

#

#maximum_session_duration = 30

 

# Allow clients to control the device

#

allow_control = 1

 

# Force 8bit mode

# 8bit mode has proven sufficiently good for most streaming use cases

#

#force_8bit = 1

 

# Maximum Bandwidth

# Limits the maximum IQ bandwidth the clients can set

# Recommended value for WFM is 200000

# Recommended value for narrow band modes is 15000

#

maximum_bandwidth = 200000

 

# FFT Frames Per Second

#

fft_fps = 15

 

# FFT Bins

# Bins = 2^fft_bin_bits

#

fft_bin_bits = 16

 

# Device Type

# Possible Values:

#   AirspyOne (R0, R2, Mini)

#   AirspyHF+

#   RTL-SDR

#

device_type = RTL-SDR

 

# Device Serial Number as 64bit Hex

# A value of 0 will acquire the first available device

#

device_serial = 2

 

# Device Sample Rate

# Possible Values:

#   Airspy R0, R2 : 10000000 or 2500000

#   Airspy Mini   :  6000000 or 3000000

#   Airspy HF+    :   768000

#   RTL-SDR       :   500000 to 3200000

# Comment to use the device's default

#

device_sample_rate = 2400000

 

# Initial Center Frequency

#

initial_frequency = 9996000

 

# Minimum Tunable Frequency

# Comment if using the device default

#

minimum_frequency = 0

 

# Maximum Tunable Frequency

# Comment if using the device default

#

maximum_frequency = 14400000

 

# Frequency Correction in PPB

#

frequency_correction_ppb = 0

 

# Initial Gain

#

initial_gain = 0

 

# RTL Sampling mode

# Quadrature = 0,

# Direct Sampling I Branch = 1

# Direct Sampling Q Branch = 2

rtl_sampling_mode = 2

 

# Converter Offset

# Set to -120000000 to enable the SpyVerter offset

#converter_offset = -120000000

 

# Bias-Tee

# For AirspyOne only - Useful for LNA's and SpyVerter

enable_bias_tee = 0

 

# Buffer Size (in milliseconds)

#

buffer_size_ms = 100

 

# Buffer Count

#

 

buffer_count = 50

 

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