Gary @N8DMT
@n8dmt@mastodon.radio  ·  activity timestamp last week
Screen capture of SATSAGEN running on the Ham Win11 PC, with the software controlling the RTL-SDR receiver and Pluto SDR transmit source. A frequency sweep is running from 70 to 1200 MHz. The plot shows the reference line at 0 dB and the classic low-pass filter shape below that the Mini-Circuits SLP-300 filter provides (attenuating frequencies above the pass band up to 300 MHz).
Screen capture of SATSAGEN running on the Ham Win11 PC, with the software controlling the RTL-SDR receiver and Pluto SDR transmit source. A frequency sweep is running from 70 to 1200 MHz. The plot shows the reference line at 0 dB and the classic low-pass filter shape below that the Mini-Circuits SLP-300 filter provides (attenuating frequencies above the pass band up to 300 MHz).
Screen capture of SATSAGEN running on the Ham Win11 PC, with the software controlling the RTL-SDR receiver and Pluto SDR transmit source. A frequency sweep is running from 70 to 1200 MHz. The plot shows the reference line at 0 dB and the classic low-pass filter shape below that the Mini-Circuits SLP-300 filter provides (attenuating frequencies above the pass band up to 300 MHz).
Gary @N8DMT
@n8dmt@mastodon.radio  ·  activity timestamp 3 weeks ago
Screen capture of Rev C schematic showing J10 (Osc Power) connecting X1 Pin 4 to +3.3VDC board power. J10 must be removed to use a ECS crystal on board and installed if a crystal oscillator is used instead. My board has a crystal and had J10 factory installed. This shorted out the +3.3VDC regulator. (Am sure it was not happy, but did not SMOKE.)
Screen capture of Rev C schematic showing J10 (Osc Power) connecting X1 Pin 4 to +3.3VDC board power. J10 must be removed to use a ECS crystal on board and installed if a crystal oscillator is used instead. My board has a crystal and had J10 factory installed. This shorted out the +3.3VDC regulator. (Am sure it was not happy, but did not SMOKE.)
Screen capture of Rev C schematic showing J10 (Osc Power) connecting X1 Pin 4 to +3.3VDC board power. J10 must be removed to use a ECS crystal on board and installed if a crystal oscillator is used instead. My board has a crystal and had J10 factory installed. This shorted out the +3.3VDC regulator. (Am sure it was not happy, but did not SMOKE.)
Gary @N8DMT
@n8dmt@mastodon.radio  ·  activity timestamp last month
Photo of the +5 dBm level test using same setup as -55 dBm, just different step attenuator setting. Sensor is within 1 dB of TinySA-Ultra reading over +5 to -55 dBm level (measured in 10 dB steps). Also calibrated temp reading using a separate 1-wire/Arduino sensor to be within 0.5 C at the set point temp.
Photo of the +5 dBm level test using same setup as -55 dBm, just different step attenuator setting. Sensor is within 1 dB of TinySA-Ultra reading over +5 to -55 dBm level (measured in 10 dB steps). Also calibrated temp reading using a separate 1-wire/Arduino sensor to be within 0.5 C at the set point temp.
Photo of the +5 dBm level test using same setup as -55 dBm, just different step attenuator setting. Sensor is within 1 dB of TinySA-Ultra reading over +5 to -55 dBm level (measured in 10 dB steps). Also calibrated temp reading using a separate 1-wire/Arduino sensor to be within 0.5 C at the set point temp.
Photo of -55 dBm calibration setup with 100 MHz oscillator, 5 dB pad, 0-70 dB 10 dB step attenuator, 2-way splitter, TinySA-Ultra level monitor, and Mini-Circuits ZX47-55 sensor connected to an Arduino with LCD display shield. Sensor is powered from a +12V wall wart power adapter. It works!
Photo of -55 dBm calibration setup with 100 MHz oscillator, 5 dB pad, 0-70 dB 10 dB step attenuator, 2-way splitter, TinySA-Ultra level monitor, and Mini-Circuits ZX47-55 sensor connected to an Arduino with LCD display shield. Sensor is powered from a +12V wall wart power adapter. It works!
Photo of -55 dBm calibration setup with 100 MHz oscillator, 5 dB pad, 0-70 dB 10 dB step attenuator, 2-way splitter, TinySA-Ultra level monitor, and Mini-Circuits ZX47-55 sensor connected to an Arduino with LCD display shield. Sensor is powered from a +12V wall wart power adapter. It works!
Gary @N8DMT
@n8dmt@mastodon.radio  ·  activity timestamp last month
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