#qdx — Public Fediverse posts
Live and recent posts from across the Fediverse tagged #qdx, aggregated by home.social.
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It worked for many months.
Wired for 12 V supply. ATU said it put out 4-5 W.
Then after a storm or three, it stopped transmitting. Might have been static zapped by storm. Might have transmitted in bad SWR as vertical antenna flexed in storm.
It still receives, the microcontroller talks on USB serial, I put a 50 ohm dummy load on the BNC port, and can tell it to test transmit, but hear nothing on a nearby KX3.
BS170s are now hot while idle. A short?
I need to find the fault.
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It worked for many months.
Wired for 12 V supply. ATU said it put out 4-5 W.
Then after a storm or three, it stopped transmitting. Might have been static zapped by storm. Might have transmitted in bad SWR as vertical antenna flexed in storm.
It still receives, the microcontroller talks on USB serial, I put a 50 ohm dummy load on the BNC port, and can tell it to test transmit, but hear nothing on a nearby KX3.
BS170s are now hot while idle. A short?
I need to find the fault.
-
It worked for many months.
Wired for 12 V supply. ATU said it put out 4-5 W.
Then after a storm or three, it stopped transmitting. Might have been static zapped by storm. Might have transmitted in bad SWR as vertical antenna flexed in storm.
It still receives, the microcontroller talks on USB serial, I put a 50 ohm dummy load on the BNC port, and can tell it to test transmit, but hear nothing on a nearby KX3.
BS170s are now hot while idle. A short?
I need to find the fault.
-
It worked for many months.
Wired for 12 V supply. ATU said it put out 4-5 W.
Then after a storm or three, it stopped transmitting. Might have been static zapped by storm. Might have transmitted in bad SWR as vertical antenna flexed in storm.
It still receives, the microcontroller talks on USB serial, I put a 50 ohm dummy load on the BNC port, and can tell it to test transmit, but hear nothing on a nearby KX3.
BS170s are now hot while idle. A short?
I need to find the fault.
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My effort to replace the four BS-170 transistors and to add protective zener diodes failed.
The microcontroller still works. Over USB it's possible to "screen /dev/ttyACM0" and get to the diagnostics, to trigger a test transmit into a 50 ohm load.
But no signal comes out.
Worse, even idle, the PA transistors and output transformer are hot. They shouldn't be!
Stare at schematic, thinking.
Might be time to write it up, bag it up, set it aside, buy replacement.
-
My effort to replace the four BS-170 transistors and to add protective zener diodes failed.
The microcontroller still works. Over USB it's possible to "screen /dev/ttyACM0" and get to the diagnostics, to trigger a test transmit into a 50 ohm load.
But no signal comes out.
Worse, even idle, the PA transistors and output transformer are hot. They shouldn't be!
Stare at schematic, thinking.
Might be time to write it up, bag it up, set it aside, buy replacement.
-
My effort to replace the four BS-170 transistors and to add protective zener diodes failed.
The microcontroller still works. Over USB it's possible to "screen /dev/ttyACM0" and get to the diagnostics, to trigger a test transmit into a 50 ohm load.
But no signal comes out.
Worse, even idle, the PA transistors and output transformer are hot. They shouldn't be!
Stare at schematic, thinking.
Might be time to write it up, bag it up, set it aside, buy replacement.
-
My effort to replace the four BS-170 transistors and to add protective zener diodes failed.
The microcontroller still works. Over USB it's possible to "screen /dev/ttyACM0" and get to the diagnostics, to trigger a test transmit into a 50 ohm load.
But no signal comes out.
Worse, even idle, the PA transistors and output transformer are hot. They shouldn't be!
Stare at schematic, thinking.
Might be time to write it up, bag it up, set it aside, buy replacement.
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Got a little QDX radio that isn't working.
Connects via USB, just looks like a sound card and a serial port.
It works like a penny whistle!
You blow on the end of the USB cable, and it measures the zero-crossings of the audio waveform, figures out the frequency, adds maybe 7 or 14 million to the number, then squeaks out a 4 Watt RF whistle to the antenna.
Except the BS-170 N-channel MOSFETs probably popped from high voltages from momentary bad SWR.
So no happy whistling.
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Got a little QDX radio that isn't working.
Connects via USB, just looks like a sound card and a serial port.
It works like a penny whistle!
You blow on the end of the USB cable, and it measures the zero-crossings of the audio waveform, figures out the frequency, adds maybe 7 or 14 million to the number, then squeaks out a 4 Watt RF whistle to the antenna.
Except the BS-170 N-channel MOSFETs probably popped from high voltages from momentary bad SWR.
So no happy whistling.
-
Got a little QDX radio that isn't working.
Connects via USB, just looks like a sound card and a serial port.
It works like a penny whistle!
You blow on the end of the USB cable, and it measures the zero-crossings of the audio waveform, figures out the frequency, adds maybe 7 or 14 million to the number, then squeaks out a 4 Watt RF whistle to the antenna.
Except the BS-170 N-channel MOSFETs probably popped from high voltages from momentary bad SWR.
So no happy whistling.
-
Got a little QDX radio that isn't working.
Connects via USB, just looks like a sound card and a serial port.
It works like a penny whistle!
You blow on the end of the USB cable, and it measures the zero-crossings of the audio waveform, figures out the frequency, adds maybe 7 or 14 million to the number, then squeaks out a 4 Watt RF whistle to the antenna.
Except the BS-170 N-channel MOSFETs probably popped from high voltages from momentary bad SWR.
So no happy whistling.
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A view of my cockpit for my "Early Bird #pota #parksontheair activation. @qrplabs #QDX #qdxdigital #qcxmini #qrpradio #cw #morsecode #PanasonicToughPad #qrpguys #minituner #linkedefhw
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A view of my cockpit for my "Early Bird #pota #parksontheair activation. @qrplabs #QDX #qdxdigital #qcxmini #qrpradio #cw #morsecode #PanasonicToughPad #qrpguys #minituner #linkedefhw
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A view of my cockpit for my "Early Bird #pota #parksontheair activation. @qrplabs #QDX #qdxdigital #qcxmini #qrpradio #cw #morsecode #PanasonicToughPad #qrpguys #minituner #linkedefhw
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A view of my cockpit for my "Early Bird #pota #parksontheair activation. @qrplabs #QDX #qdxdigital #qcxmini #qrpradio #cw #morsecode #PanasonicToughPad #qrpguys #minituner #linkedefhw
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A view of my cockpit for my "Early Bird #pota #parksontheair activation. @qrplabs #QDX #qdxdigital #qcxmini #qrpradio #cw #morsecode #PanasonicToughPad #qrpguys #minituner #linkedefhw
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It was a 40M @qrplabs #QCXmini #CW #MorseCode & 40m/30m #QDX #FT8 Early Bird 4th of July #POTA #parksontheair activation Almost had some early fireworks display if I only could have completed a FT8 #QSO with Bob @KF0UNK My #QRP signal just didn't have enough oomph to break through the traffic #AmateurRadio #HamRadio
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It was a 40M @qrplabs #QCXmini #CW #MorseCode & 40m/30m #QDX #FT8 Early Bird 4th of July #POTA #parksontheair activation Almost had some early fireworks display if I only could have completed a FT8 #QSO with Bob @KF0UNK My #QRP signal just didn't have enough oomph to break through the traffic #AmateurRadio #HamRadio
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It was a 40M @qrplabs #QCXmini #CW #MorseCode & 40m/30m #QDX #FT8 Early Bird 4th of July #POTA #parksontheair activation Almost had some early fireworks display if I only could have completed a FT8 #QSO with Bob @KF0UNK My #QRP signal just didn't have enough oomph to break through the traffic #AmateurRadio #HamRadio
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It was a 40M @qrplabs #QCXmini #CW #MorseCode & 40m/30m #QDX #FT8 Early Bird 4th of July #POTA #parksontheair activation Almost had some early fireworks display if I only could have completed a FT8 #QSO with Bob @KF0UNK My #QRP signal just didn't have enough oomph to break through the traffic #AmateurRadio #HamRadio
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It was a 40M @qrplabs #QCXmini #CW #MorseCode & 40m/30m #QDX #FT8 Early Bird 4th of July #POTA #parksontheair activation Almost had some early fireworks display if I only could have completed a FT8 #QSO with Bob @KF0UNK My #QRP signal just didn't have enough oomph to break through the traffic #AmateurRadio #HamRadio
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Ok, just discovered digipi.org, which seems like a perfect combination for the QDX for doing digital modes on the go. Here I’d been thinking I might have to go buy a laptop…but here’s a solution for $40ish. #ft8 #qdx #raspberrypi #digipi #hamradio
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Ok, just discovered digipi.org, which seems like a perfect combination for the QDX for doing digital modes on the go. Here I’d been thinking I might have to go buy a laptop…but here’s a solution for $40ish. #ft8 #qdx #raspberrypi #digipi #hamradio
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Ok, just discovered digipi.org, which seems like a perfect combination for the QDX for doing digital modes on the go. Here I’d been thinking I might have to go buy a laptop…but here’s a solution for $40ish. #ft8 #qdx #raspberrypi #digipi #hamradio
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Ok, just discovered digipi.org, which seems like a perfect combination for the QDX for doing digital modes on the go. Here I’d been thinking I might have to go buy a laptop…but here’s a solution for $40ish. #ft8 #qdx #raspberrypi #digipi #hamradio
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I built a #QRPGuys 40-10 #Minituner a few years ago but never built a wire for it. Thanks to current #Geomagneticstorm conditions, I built a 40 -15 Meter Linked #EFHW that I can use with my #Youkits #YouKitsHB1B #HB1B and my #QRPlabs #QDX. #AmateurRadio #HamRadio is so much fun!
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I built a #QRPGuys 40-10 #Minituner a few years ago but never built a wire for it. Thanks to current #Geomagneticstorm conditions, I built a 40 -15 Meter Linked #EFHW that I can use with my #Youkits #YouKitsHB1B #HB1B and my #QRPlabs #QDX. #AmateurRadio #HamRadio is so much fun!
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I built a #QRPGuys 40-10 #Minituner a few years ago but never built a wire for it. Thanks to current #Geomagneticstorm conditions, I built a 40 -15 Meter Linked #EFHW that I can use with my #Youkits #YouKitsHB1B #HB1B and my #QRPlabs #QDX. #AmateurRadio #HamRadio is so much fun!
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I built a #QRPGuys 40-10 #Minituner a few years ago but never built a wire for it. Thanks to current #Geomagneticstorm conditions, I built a 40 -15 Meter Linked #EFHW that I can use with my #Youkits #YouKitsHB1B #HB1B and my #QRPlabs #QDX. #AmateurRadio #HamRadio is so much fun!
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I built a #QRPGuys 40-10 #Minituner a few years ago but never built a wire for it. Thanks to current #Geomagneticstorm conditions, I built a 40 -15 Meter Linked #EFHW that I can use with my #Youkits #YouKitsHB1B #HB1B and my #QRPlabs #QDX. #AmateurRadio #HamRadio is so much fun!
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Since my QTH continues to be inundated by storms, I need to take advantage of them and build my other @qrplabs 20 - 10 meter #QDX #qdxdigital before Ten goes away. #amateurradio #hamradio #FT8 #wsjtx
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Since my QTH continues to be inundated by storms, I need to take advantage of them and build my other @qrplabs 20 - 10 meter #QDX #qdxdigital before Ten goes away. #amateurradio #hamradio #FT8 #wsjtx
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Since my QTH continues to be inundated by storms, I need to take advantage of them and build my other @qrplabs 20 - 10 meter #QDX #qdxdigital before Ten goes away. #amateurradio #hamradio #FT8 #wsjtx
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Since my QTH continues to be inundated by storms, I need to take advantage of them and build my other @qrplabs 20 - 10 meter #QDX #qdxdigital before Ten goes away. #amateurradio #hamradio #FT8 #wsjtx
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Since my QTH continues to be inundated by storms, I need to take advantage of them and build my other @qrplabs 20 - 10 meter #QDX #qdxdigital before Ten goes away. #amateurradio #hamradio #FT8 #wsjtx
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The #QDX is alive(-ish!)
I finished winding all the toroids today, and tried to get it "on the air" through a dummy load.
It connects to WSJT-X fine, but my cheap USB-A->B cable is sucking up RF like crazy and crashing my interface immediately on transmit. So, I can't actually check transmit power because transmit stops immediately...
Anyone have ideas on how to remedy this?
-
The #QDX is alive(-ish!)
I finished winding all the toroids today, and tried to get it "on the air" through a dummy load.
It connects to WSJT-X fine, but my cheap USB-A->B cable is sucking up RF like crazy and crashing my interface immediately on transmit. So, I can't actually check transmit power because transmit stops immediately...
Anyone have ideas on how to remedy this?
-
The #QDX is alive(-ish!)
I finished winding all the toroids today, and tried to get it "on the air" through a dummy load.
It connects to WSJT-X fine, but my cheap USB-A->B cable is sucking up RF like crazy and crashing my interface immediately on transmit. So, I can't actually check transmit power because transmit stops immediately...
Anyone have ideas on how to remedy this?
-
The #QDX is alive(-ish!)
I finished winding all the toroids today, and tried to get it "on the air" through a dummy load.
It connects to WSJT-X fine, but my cheap USB-A->B cable is sucking up RF like crazy and crashing my interface immediately on transmit. So, I can't actually check transmit power because transmit stops immediately...
Anyone have ideas on how to remedy this?
-
The #QDX is alive(-ish!)
I finished winding all the toroids today, and tried to get it "on the air" through a dummy load.
It connects to WSJT-X fine, but my cheap USB-A->B cable is sucking up RF like crazy and crashing my interface immediately on transmit. So, I can't actually check transmit power because transmit stops immediately...
Anyone have ideas on how to remedy this?