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Re: uBITX AGC - Adafruit TPA2016, A Success!
#ubitx
Hi Nik,
I have two questions for you in regards to using the TPA2016 module.? First question is are you taking the audio input to the module directly from the volume pot wiper? That was my take on an earlier post you made.? I have two modules and both behave the same.? One module I connected as just a stock amplifier, with no connections to the I2C bus, and the audio output is extremely low.? In order to hear a 50uV 1KHz signal I have to turn the volume control to maximum.? The second module I have configured with the I2C connections to the Arduino Nano and have the Vcc line for the I2C connected to the 3.3V port.? The Vdd line is connected to 5V.? I have the same results - extremely low audio.? I'm using the left channel for input and output.? My speaker is not grounded in either case.? The second question is more of a request.? Would you post your modified Adafruit library files in the File section here on Groups IO?? I thought I had your library modifications figured out but now I'm not completely certain.? Before I start chasing my tail in the wrong direction I'd like to know that at least the files I've modified and am using are not part of the problem. Thanks for your work, I certainly appreciate it. --73-- Mike? --? W0MNE |
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Re: Distorted RX audio at higher volumes
#ubitx-help
"Multiple speakers and headphones have been tried with no improvement."
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Re: Distorted RX audio at higher volumes
#ubitx-help
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Re: Distorted RX audio at higher volumes
#ubitx-help
Thanks Mvs Sarma. I have some spare LM386s here, but I have not looked to see if they are directly swappable. (I have never used a?TDA2822?before) . |
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Re: Distorted RX audio at higher volumes
#ubitx-help
Also limit the power supply to 12V while testing the audio in RX. ? Regards MVS Sarma ? On Fri, Feb 23, 2018 at 11:00 AM, Mvs Sarma <mvssarma@...> wrote:
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Re: Distorted RX audio at higher volumes
#ubitx-help
why not try? replacing the TDA2822. !! Regards MVS Sarma ? On Fri, Feb 23, 2018 at 10:54 AM, Pez T <vk3xpt@...> wrote: Hi All, |
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Distorted RX audio at higher volumes
#ubitx-help
Hi All,
My uBITX has arrived and went together with no issues. I have a question about the audio stage and a potential issue with my uBITX.? At LOW volume levels, the RX audio is smooth and sounds great, however any volume setting above roughly 20% starts to distort badly, and sound horrible. Therefore I have the leave the radio volume set very quietly to use it.? NOTES: My BFO settings are all good (now running KD8CEC firmware, but it was the same with standard firmware). TX audio is very good. Multiple speakers and headphones have been tried with no improvement. I understand how AGC works and I know that the uBITX has no AGC :) Also, the audio IC runs very HOT.? Can anyone here provide some suggestions please? I have watched a number of YouTube videos and others do not seem to be having this RX audio problem.? Thanks in advance!? |
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Re: Activity on ubitx.net
Jack Purdum
Check to see that your messages are not being directed to spam. One time I clicked the wrong "Move-to" link and set it to Spam. After that, I was removed from subsequent mailings. Look for a message from Group.io explaining what happened and follow their link to reestablish your link. Jack, W8TEE From: Clark Martin <kk6isp@...> To: [email protected] Sent: Friday, February 23, 2018 12:03 AM Subject: Re: [BITX20] Activity on ubitx.net I¡¯m on several groups and have been receiving messages regularly. ?Perhaps the problem is localized. Clark Martin KK6ISP
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Re: Debouncing rotary encoder
All Denouncing and pullups are also possible in the firmware. This is the method I use in the QRP Labs kits like QCX - look at the schematic: no pull-ups, no RC-debounce. Saves 6 components (4 resistors, 2 capacitors). It's not important in a one-off build or modification but in a kit where you are trying to optimise cost every resistor helps! The firmware method also gives you more control over how you do your debounce. I prefer the state-machine approach to rotary encoder handling, it implicitly debounces without involving any time constants. 73 Hans G0UPL? ? |
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Re: wiring harness bitx40
Vince Vielhaber
The only time it has ever taken more than a week to get a Tayda order is when the USPS misplaced it in Denver. Someone must really dislike you!
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Vince. On 02/22/2018 10:14 PM, Jim Sheldon wrote:
They were actually out of them when I ordered these. It usually takes --
Michigan VHF Corp. |
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Re: Activity on ubitx.net
¿ªÔÆÌåÓýI¡¯m on several groups and have been receiving messages regularly. ?Perhaps the problem is localized.Clark Martin KK6ISP
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Re: #ubitx replaced Arduino Nano gives a lot of I2C interference during reception
#ubitx
sorry half reply I do agree the suggestion? of? Mike? to use 0.01uF . If you use 0.1 Regards MVS Sarma ? |
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Re: #ubitx replaced Arduino Nano gives a lot of I2C interference during reception
#ubitx
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Digital attenuation
¿ªÔÆÌåÓýI was interested in Karl K0MWC's suggestion to use a PE digital
attenuation chip to address the problem of variable power out on
the ?BITx.? (Refer: /g/BITX20/message/42298).?? I
was not so thrilled to note that this chip is only available as a
"microscopic surface mount" package. So, I did a bit of searching online and found an alternative device (less precision but we can live with 1dB steps) that is available as a pre-built module (using an HMC470 chip) for around US$13 ex China. This seems quite a nice little module that could be used as follows: On TX:? control drive level to the
pre-driver stage On RX: as an RF gain control
(selectable in the menu and using the encoder to control 32 steps
from 0dB to 31dB of attenuation)? AND ??? ??? ??? as part of an AGC circuit to reduce gain for strong signals. I have summarized the discussion of all the options for addressing variable output power from the ?BITx in a news article on ubitx.net here: I ordered a couple of the modules, and I will tell you the outcome of my experiments in 2-3 months time.? It takes a while for parcels to arrive from China down here.?? Somebody else might beat me to it hopefully (like they did with the little mic compressor/noise gate chip) and can let us know how this scheme works! BTW - if you use two modules in series you can get 62dB of
attenuation! That would be great for AGC control! 73?? Mike ZL1AXG |
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Re: wiring harness bitx40
¿ªÔÆÌåÓýI usually get my orders within a week. For the connectors, you need to look for the 2500 series wafer connectors:Karl Heinz Kremer PDF Acrobatics Without a Net? PDF Software Development, Training and More...? ? On Feb 22, 2018, at 10:29 PM, Jim Sheldon <w0eb@...> wrote:
--
Karl Heinz - K5KHK |
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Re: wiring harness bitx40
Jack Purdum
I kinda have to agree with Mike. I've bought a lot of stuff from them and it's usually here within a week and their prices are really good. I do know they have a distribution facility in Livingston, CO, which is why most of their stuff arrives quickly. You may have ordered an item which was out of stock, which they fly in from Thailand (I think ?). Jack, W8TEE From: Jim Sheldon <w0eb@...> To: [email protected] Sent: Thursday, February 22, 2018 10:14 PM Subject: Re: [BITX20] wiring harness bitx40 They were actually out of them when I ordered these. ?It usually takes me just as long (longer sometimes) to get stuff from Tayda as it does out of Hong Kong or Mainland China and it's the same exact stuff. ?I actually get it cheaper off of eBay. ?But then you must work for Tayda as much as you plug them - LOL. Jim?
------ Original Message ------
From: "Michael Hagen" <motdog@...>
Sent: 2/22/2018 9:10:30 PM
Subject: Re: [BITX20] wiring harness bitx40
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Re: wiring harness bitx40
¿ªÔÆÌåÓýI've always had long delivery times from them and their on site search shows no KF2510 connectors even now. ?If they have them, I can't find them. Jim On Feb 22, 2018, at 9:24 PM, Michael Hagen <motdog@...> wrote:
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Re: wiring harness bitx40
¿ªÔÆÌåÓýSorry...... That's not the Tayda I have ordered from? I have never had Tayda take over? a week?? And yes they also sell on eBay with Free Shipping. But the eBay prices from Tayda are more than ordering direct. So have you had Long delivery time? I have no investment
in them! Mike, WA6ISP On 2/22/2018 7:14 PM, Jim Sheldon
wrote:
-- Mike Hagen, WA6ISP 10917 Bryant Street Yucaipa, Ca. 92399 (909) 918-0058 PayPal ID "MotDog@..." Mike@... |
N8DAH
Jim Sheldon