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audio dropping out

[email protected] #49868 Ok, something new. I think I may need to replace one, or both of the wiring harness to the raduino and the board. I get audio spontaneously dropping out. If I just touch these wires it comes back. It's like a capacitance issue. Just lightly touching the yellow or orange or both wires brings the audio back. Makes me crazy when I try to copy a station. Any ideas? Thanks!
Jim, N5IB All Messages By This Member #49870 Check the metal spring-sockets that are inserted into the plastic housing of the wiring harness. I found on mine that the little tab that is supposed to keep the metal contact from backing out did not engage the slot in the plastic housing. When the connector was plugged onto the header, the socket got pushed backwards and made poor or intermittent contact. I pulled the socket out of the housing, bent the tab slightly and re-inserted it. It held solidly after that. N5IB
Raj vu2zap Member Profile All Messages By This Member #49878 The connector pins are not making contact OR the crimp of one of the wires is bad! Raj toggle quoted message Show quoted text At 21-05-18, you wrote: Ok, something new. I think I may need to replace one, or both of the wiring harness to the raduino and the board. I get audio spontaneously dropping out. If I just touch these wires it comes back. It's like a capacitance issue. Just lightly touching the yellow or orange or both wires brings the audio back. Makes me crazy when I try to copy a station. Any ideas? Thanks!
[email protected] #50391 Ok, thanks all. I checked the pins on the connector. I also got rid of excess wiringing and resoldered the yellow orange and green wires to the audio jack. None of that helps. What I did find by listening to it for awhile is that the audio always dropped out when there where a lot of strong stations on or nearby in freq. I think this is a case of of the processor getting swamped due to lack of AGC. The audio always comes back after a bit, even if I just leave it alone! Thoughts?
Raj vu2zap Member Profile All Messages By This Member #50393 I have an idea but which board avatar is this? Raj toggle quoted message Show quoted text At 26/05/2018, you wrote: Ok, thanks all. I checked the pins on the connector. I also got rid of excess wiringing and resoldered the yellow orange and green wires to the audio jack. None of that helps. What I did find by listening to it for awhile is that the audio always dropped out when there where a lot of strong stations on or nearby in freq. I think this is a case of of the processor getting swamped due to lack of AGC. The audio always comes back after a bit, even if I just leave it alone! Thoughts?
[email protected] #50403 Raj, I am not sure what you mean by avatar. It is the uBITX...is that what you are looking for? Dave
Raj vu2zap Member Profile All Messages By This Member #50406 Hi Dave, Thats it uBitx.. this group deals with Bitx20/40/u with different circuits! Raj toggle quoted message Show quoted text At 26/05/2018, you wrote: Raj, I am not sure what you mean by avatar. It is the uBITX...is that what you are looking for? Dave
Dave de WS1ETI #50485 Raj, I've seen many many references to the uBITX here. Allison is working on a mod to flatten the power curve across bands. So, I am confused what does the "u" stand for in "Bitx20/40/u"?. This is where Ashar sent me to ask questions? Was I mistaken??? ? Thanks, Dave WS1ETI
Jack Purdum #50486 This Forum is a general place to seek help on the Bitx40, Bitx20, and the uBITX, hence the "Bitx20/40/u". Like they say, the art of a good answer is a clearly-stated question. Many of the regulars here are very bright people and been a huge help to thousands of owners. Another relatively new, but very helpful, resource can be found at ubitx.net. Jack, W8TEE On Sunday, May 27, 2018, 10:46:48 AM EDT, Dave de WS1ETI <docame12@...> wrote: Raj, I've seen many many references to the uBITX here. Allison is working on a mod to flatten the power curve across bands. So, I am confused what does the "u" stand for in "Bitx20/40/u"?. This is where Ashar sent me to ask questions? Was I mistaken??? ? Thanks, Dave WS1ETI
Doug W All Messages By This Member #50489 Dave You are in the right place.? The u is actually a ? as in micro for micro controller.? Which is Ashhar's most current and first multi band radio.? The original BITX was a single bander so the number after BITX designates the band that radio is built for.? This site is for all variations of the BITX family.? The boards are different so it helps to know what you are working on. On a totally separate note that is a great call sign.? I've been crunching for 15+ years.
Raj vu2zap Member Profile All Messages By This Member #50559 It should refer to uBitx! Unless you tell us which board you are referring to then only someone can answer your questions! toggle quoted message Show quoted text At 27/05/2018, you wrote: Raj, I've seen many many references to the uBITX here. Allison is working on a mod to flatten the power curve across bands. So, I am confused what does the "u" stand for in "Bitx20/40/u"?. This is where Ashar sent me to ask questions? Was I mistaken? Thanks,
Dave de WS1ETI #50613 Raj, ? I meant no insult. I was confused. I see it turns out I was not being clear. I apologize.?Can we please start over? What was your idea, on the uBITX audio problem I described? Thanks, Dave
Jerry Gaffke All Messages By This Member #50617 I don't think anybody feels insulted here just yet. Just a bit of confusion. You have a very weird problem though: > I get audio spontaneously dropping out. If I just touch these wires it comes back. > It's like a capacitance issue. Just lightly touching the yellow or orange or both wires brings the audio back and later: > the audio always dropped out when there where a lot of strong stations on or nearby in freq. > I think this is a case of of the processor getting swamped due to lack of AGC. > The audio always comes back after a bit, even if I just leave it alone! Thoughts? I don't think we have seen a problem quite like that before in the forum. Your first post makes it look like a bad cable.? Sometimes the wire is? not attached? to the cable connector correctly, a bad crimp job.? You could diagnose this by using an ohmmeter between the bottom of the uBitx board where the connector pin is soldered in place and the far end of the cable, then use your third hand to jiggle the cable But your second post sounds more like? a circuit problem.? The fact that the problem occurs either when there is a loud radio station but is affected when you? touch the wires suggests it is somewhere between the volume pot and the speaker. Does the problem also occur when you have the volume set so low that you can barely hear it? ? If you have some other audio amplifier such as a project with an LM386 in it or perhaps some old computer? speakers or hi-fi audio amp, you might try running audio from the middle pin (wiper) of the volume pot over to this other amp, also a ground wire.? Put volume pot at minimum, power up, then slowly turn up the volume a bit till you can hear the radio.? If the problem does not come through, then it is probably something wrong with the TDA2822. The Nano processor on the Raduino never sees the audio, so it will doesn't get overloaded. But the TDA2822 might be doing something funny when it sees loud signals. toggle quoted message Show quoted text On Mon, May 28, 2018 at 12:15 pm, Dave de WS1ETI wrote: I meant no insult. I was confused. I see it turns out I was not being clear. I apologize.?Can we please start over? What was your idea, on the uBITX audio problem I described? Thanks, Dave
Raj vu2zap Member Profile All Messages By This Member #50658 None taken, Send me a recording of that happening in your uBitx. What is the marking on the audio chip ? In bitx40 there is a 100 Ohms and a diode in series with the LM386 which has packed up in one of my boards. The diode was slowly charging the capacitor and audio would return and drop out. Raj toggle quoted message Show quoted text At 29/05/2018, you wrote: Raj, I meant no insult. I was confused. I see it turns out I was not being clear. I apologize. Can we please start over? What was your idea, on the uBITX audio problem I described? Thanks, Dave
Dave de WS1ETI #50676 On Mon, May 28, 2018 at 12:39 pm, Jerry Gaffke wrote: Does the problem also occur when you have the volume set so low that you can barely hear it? I want to say no it does not. It seems to be happening only when the vol pot is at half way position, or higher, and a loud station comes on.? I hear a crackling noise as the sound drops out fairly quick. Then, it will also come back the same way, by itself with no intervention from me. (Like I said earlier, sometimes if I touch the range and yellow wires the sound comes back. Now, I don't know if this was just coincidence.)???It also happens while I am tuning up on whatever band and I have the volume too high. If I turn it down, it seems to stop. Thanks, Dave ?
Raj vu2zap Member Profile All Messages By This Member #50679 Dave, Solder a wire to the 2822 audio chip 12v in PIN 2 and monitor the voltage when this audio dropout happens. A plated through hole may not be conducting properly if the voltage is dropping! OTOH, your audio chip maybe bad. Raj At 29/05/2018, you wrote: toggle quoted message Show quoted text On Mon, May 28, 2018 at 12:39 pm, Jerry Gaffke wrote: Does the problem also occur when you have the volume set so low that you can barely hear it? I want to say no it does not. It seems to be happening only when the vol pot is at half way position, or higher, and a loud station comes on.? I hear a crackling noise as the sound drops out fairly quick. Then, it will also come back the same way, by itself with no intervention from me. (Like I said earlier, sometimes if I touch the range and yellow wires the sound comes back. Now, I don't know if this was just coincidence.)?? It also happens while I am tuning up on whatever band and I have the volume too high. If I turn it down, it seems to stop. Thanks, Dave ?

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