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Re: ubitx v5 down: IRF510 heatsink very hot immediately after turning on the radio
#ubitx-help
#ubitx
Since the IRF510 heatsinks are getting very hot very quickly right after turning on
the radio - I am afraid to keep the radio on and potentially cause more damage.
I am currently thinking of
Since the IRF510 heatsinks are getting very hot very quickly right after turning on
the radio - I am afraid to keep the radio on and potentially cause more damage.
I am currently thinking of
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By
Jens Kaemmerer
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#67706
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Re: ubitx v5 down: IRF510 heatsink very hot immediately after turning on the radio
#ubitx-help
#ubitx
if the signals have fallen from the waterfall, that means you are unable to receive. IRF510s may not be involved. Are you able to receive SSB/CW signals? You should check your audio cable.
- f
if the signals have fallen from the waterfall, that means you are unable to receive. IRF510s may not be involved. Are you able to receive SSB/CW signals? You should check your audio cable.
- f
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By
Ashhar Farhan
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#67705
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Re: ubitx v5 down: IRF510 heatsink very hot immediately after turning on the radio
#ubitx-help
#ubitx
Check the supply current to the PA with a meter. If it’s significantly higher than the idle current, say 250-300 mA it’s probably damaged. To be sure, turn the bias pots to the full clockwise
Check the supply current to the PA with a meter. If it’s significantly higher than the idle current, say 250-300 mA it’s probably damaged. To be sure, turn the bias pots to the full clockwise
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By
Clark Martin
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#67704
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ubitx v5 down: IRF510 heatsink very hot immediately after turning on the radio
#ubitx-help
#ubitx
I might have broken the IRF510 MOSFETs with FT8.
This problem started during a longer sequence of FT8
transmissions - abruptly all signals disappeared from
the waterfall.
The heatsinks used to get
I might have broken the IRF510 MOSFETs with FT8.
This problem started during a longer sequence of FT8
transmissions - abruptly all signals disappeared from
the waterfall.
The heatsinks used to get
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By
Jens Kaemmerer
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#67703
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Re: CW key sticking with Nextion LCD
At first I wrapped a barrel chock on the wires of Nextion. It helped a little. The I put a .01uf on the blue wire of Nextion and ground and that stopped the key from sticking.
Joe
At first I wrapped a barrel chock on the wires of Nextion. It helped a little. The I put a .01uf on the blue wire of Nextion and ground and that stopped the key from sticking.
Joe
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By
Joe Puma
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#67702
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Re: v5 12m/10m Spectrums
Hi Curt. I had to prove it to myself using a spreadsheet when I started reading these, dBm or dBV doesn't matter when comparing peaks within one spectrogram. Here's my math proof using the peaks
Hi Curt. I had to prove it to myself using a spreadsheet when I started reading these, dBm or dBV doesn't matter when comparing peaks within one spectrogram. Here's my math proof using the peaks
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By
ronmhauser@...
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#67701
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Re: CW key sticking with Nextion LCD
I didn't follow the link but You might try a torrid on the orange line and/or between the raduino and nextion.
I didn't follow the link but You might try a torrid on the orange line and/or between the raduino and nextion.
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By
_Dave_ AD0B
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#67700
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Re: v5 12m/10m Spectrums
My concern is whether we are measuring a power ratio or a voltage ratio - I am suspicious we could be measuring the latter -- see
https://en.wikipedia.org/wiki/Decibel#Voltage
I am thinking that if
My concern is whether we are measuring a power ratio or a voltage ratio - I am suspicious we could be measuring the latter -- see
https://en.wikipedia.org/wiki/Decibel#Voltage
I am thinking that if
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By
Curt
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#67699
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Re: v5 12m/10m Spectrums
Well, the AD2 is really a (software defined digital) scope with FFT ... so the front end is a scope front end, the probes are high impedance voltage input. Therefore the display is relative to
Well, the AD2 is really a (software defined digital) scope with FFT ... so the front end is a scope front end, the probes are high impedance voltage input. Therefore the display is relative to
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By
ronmhauser@...
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#67698
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Re: CW key sticking with Nextion LCD
Thanks Sam!
Sent from Mail for Windows 10
Thanks Sam!
Sent from Mail for Windows 10
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By
Joe Puma
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#67697
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Re: Microphone choices
I bought one for my bitx40 they work out very nice. I take the element out and put it in a mini mic.
http://www.jlielectronics.com/microphones/com-mic-jli-52b/
--
David
I bought one for my bitx40 they work out very nice. I take the element out and put it in a mini mic.
http://www.jlielectronics.com/microphones/com-mic-jli-52b/
--
David
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By
N8DAH <Dherron@...>
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#67696
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Re: CW key sticking with Nextion LCD
https://ubitx.net/category/hardware/cw-keying-issue/
https://ubitx.net/category/hardware/cw-keying-issue/
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By
Sam Tedesco
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#67695
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Re: CW key sticking with Nextion LCD
I'm on v3, also. I tried looking for the original post, but couldn't find it. Anyway, your descriptions sounds about right. I thought it was odd back when I tried it for the first time...I have a few
I'm on v3, also. I tried looking for the original post, but couldn't find it. Anyway, your descriptions sounds about right. I thought it was odd back when I tried it for the first time...I have a few
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By
Sam Tedesco
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#67694
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Re: Microphone choices
Even if one is rich, i suppose that there is no point in investing in mics that zerve high end systems for ham use. We dont really need more than 0.3 to 3Khz at the maximum
Regards
Sarma vu3zmv
Even if one is rich, i suppose that there is no point in investing in mics that zerve high end systems for ham use. We dont really need more than 0.3 to 3Khz at the maximum
Regards
Sarma vu3zmv
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By
MVS Sarma
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#67693
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Re: Microphone choices
If you can't afford a Behemoth microphone (hi hi) you may try high sensitivity (around - 24db) electrec elements you may find at large vendors (Mouser etc). I opted for dynamic elements (not for
If you can't afford a Behemoth microphone (hi hi) you may try high sensitivity (around - 24db) electrec elements you may find at large vendors (Mouser etc). I opted for dynamic elements (not for
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By
iz oos
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#67692
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Re: Microphone choices
My two cents...
First I've tried with a karaoke mic and a audio console
Good: I get 10W of power without effort, talking quietly
Bad: The signal transmitted is extremely low pitch (very dificult to
My two cents...
First I've tried with a karaoke mic and a audio console
Good: I get 10W of power without effort, talking quietly
Bad: The signal transmitted is extremely low pitch (very dificult to
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By
David - CA3DPV
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#67691
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Re: Poor mans spurs and harmonics check with uBitxandcommercial radio
Yes the uBitx might have some flaws but not hard to find issues with other radios or how a ham is using it, mods, running power, etc. There are a lot of aging radios out there, my 840 is of the latest
Yes the uBitx might have some flaws but not hard to find issues with other radios or how a ham is using it, mods, running power, etc. There are a lot of aging radios out there, my 840 is of the latest
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By
Joe Puma
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#67690
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Re: uBitx V5 Audio improvement
Attached couple of mods I've been using ...One variable audio filter and one mod Re 386 ...
The 386 shows what I measured on the ic with a 10 uF cap pin 1-8 ...flat from near dc to daylight ..What I
Attached couple of mods I've been using ...One variable audio filter and one mod Re 386 ...
The 386 shows what I measured on the ic with a 10 uF cap pin 1-8 ...flat from near dc to daylight ..What I
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By
Jim Tibbits
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#67689
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Re: Poor mans spurs and harmonics check with uBitx andcommercial radio
:) I think the TX of the ubitx has been the most tested, loved and blamed by hams in history. Also because it should be assumed that commercial ones should have no basic issue in terms of harmonics
:) I think the TX of the ubitx has been the most tested, loved and blamed by hams in history. Also because it should be assumed that commercial ones should have no basic issue in terms of harmonics
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By
iz oos
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#67688
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Re: Poor mans spurs and harmonics check with uBitx andcommercial radio
Looks like the ubitx screenshot didn’t get attached properly, here they both are again for comparison.
Sent from Mail for Windows 10
Looks like the ubitx screenshot didn’t get attached properly, here they both are again for comparison.
Sent from Mail for Windows 10
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By
Joe Puma
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#67687
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