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New to Raspberry Pi and this group
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I just recently joined this group. I'm new to the Raspberry Pi and actually new to Linux. My original purpose for the Ras[berry Pi was to use it as a spectrum monitor for the IF of microwave transverters. This would hopefully take one unknown (the frequency) out of the picture when trying to peak a signal with a dish antenna.? My laptop is an energy hog and is also bulky. Not very conducive to microwave hilltopping operations. I got a Raspberry Pi 4B. I found these instructions for installation of a program called Freqshow on the Adafruit website: This seems ideal and exactly what I want. The only problem right now is that the Adafruit 3.5 inch PiTFT display is nowhere to be found. Everyone who carries them is out of them. So that project is on the back burner right now. I successfully installed the OS for the Raspberry Pi on a 64 Gb micro-SD card. Then I found this site: So far, I have successfully installed GNU Radio, GQRX, RTL-SDR, FLDIGI, FLRIG, WSJTX , JS8CALL and QSSTV on the Pi using the instructions there. I think it's successful because FLRIG connects OK to my FT897D using a CT62 USB cable.It seems more limited than what the webpage shows with installation instructions shows. I am only able to change frequency and mode of the radio, For some reason I have no controls shown for volume, squelch, noise reduction, etc. Maybe these aren't available for that rig in that program. GQRX seems to work OK with the SDR dongles I have, except when I use it with the FUNCube dongle, the mouse locks up and I have to unplug the dongle to get mouse use back again. I'm not sure why that is, either. It works fine with RTL-SDR Blog V3 and Airspy Discovery HF+ dongles. Hopefully some day the 3.5 inch PiTFT displays will be available again and I can start playing around with using that on the Raspberry Pi. 73, Zack W9SZ |
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I got curious and used a 12 to 5 volt adaptor with a USB-C plug on it. I have no way of measuring the current on a USB-C line. But I can measure the current on the 12 volt line. Current at 5 volts is probably slightly more than twice the 12 volt draw. With the Raspberry Pi 4 with a USB keyboard and mouse connected to the USB 2.0 ports and an HDMI cable to a monitor, after it's booted up and in a quiescent state, I measure 120 mA draw at 12.4 volts to the adaptor. Plugging in each SDR dongle I have, one at a time, into a USB 3.0 port, I measure on the 12 v line: RTL-SDR Blog V3 = 180 mA FUNCube Pro + = 220 mA Airspy Discovery HF+ = 190 mA These do not look excessive to me and are well within the 3A maximum draw of the Raspberry Pi. I cannot imagine the USB ports drawing anything near their maximum capacity with those measurements. I don't think that's the problem. These are with the 32 bit Raspberry Pi OS. I installed the 64 bit OS on another micro-SD card and installed GQRX on it. I haven't measured the currents on that, but the same thing happens. The RTL-SDR Blog V3 and the Airspy unit continue to work fine when I click on "play SDR." The Funcube causes the mouse to freeze up. I think there is some bug in the software for the Funcube. By the way, my laptop draws 5 amps at 12 volts. That's what I'm trying to get away from. It looks like the Raspberry Pi will be far below that current draw. Zack W9SZ On Sat, Aug 3, 2024 at 9:42?AM N5XMT via <dacooley=[email protected]> wrote:
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Chuck N7CHS On 8/6/2024 8:44 PM, Zack Widup via groups.io wrote:
I have no way of measuring the current on a USB-C line. |
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Also, the current at 5v will be 2.4x the current at 12v.
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On Aug 7, 2024, at 11:49, "N5XMT via " <gmail.com@groups.io target=_blank>[email protected]> wrote:
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The problem I have had is evidently a common and well-known problem with the FUNCube dongle on GQRX. After some searching, I found a site that outlined a repair. It said Add this line to the bottom of /boot/config.txt: ? dtoverlay=dwc2,dr_mode=host I am going to try that this evening. Zack W9SZ
On Wed, Aug 7, 2024 at 1:49?PM N5XMT via <dacooley=[email protected]> wrote:
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On Wed, Aug 7, 2024 at 3:31?PM Zack Widup via <w9sz.zack=[email protected]> wrote:
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I have done an extensive search on internet for solutions to the problem I have been having. It seems to be specific to the FUNCube Dongle Pro + and GQRX on the Raspberry Pi. It seems to be a problem that many are having, not just me. It has nothing to do with how much current the FUBCube is drawing. It is about the same for all three SDR dongles I am using and the other two, the RTL-SDR Blog V3 and the Airspy Discovery HF+, all work fine with GQRX on the Raspberry Pi. I have tried a couple suggested solutions I found but none of them worked (when the FUNCube is started, the mouse and keyboard lock up). At this time I am giving up on using the FUNCube with GQRX on the Pi. Maybe it will work on another SDR program. I still have two other SDRmodules that DO work. 73, Zack W9SZ On Wed, Aug 7, 2024 at 6:24?PM Zack Widup via <w9sz.zack=[email protected]> wrote:
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