Re: shop.kit-projects AGC board. Seeking install instructions
Good catch Dan!
Fixed the pdf thank you.
?73
--
David
?N8DAH
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Rajesh
Do listen with headphones to see if audio is still very distorted.
These boards usually arrive with the BFO not properly adjusted. If the signal is coming too close or beyond the edge of the crystal filter passband this can cause significant distortion. Its the setting of the BFO that determines where the audio signal sits when it passes through the xtal filter.
A smaller thing, some of us modify the lm386 circuit for a better sound. This info is on the web. See la3za website,? but this is a minor aspect.
Check simple things before presuming its a circuit issue, it may not be.
Curt wb8yyy
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Re: shop.kit-projects AGC board. Seeking install instructions
Many thanks, David. It's all working. I *do* notice a drop in overall volume.
Just an FYI for your documentation: You indicate that the S-meter connection on a TSW Teensy can go to pin A19. There is no "pin A19." There is a pin 19 which is A5. Using A5 doesn't work. The TSW documentation says it should go to A7. It also says it's pre-calibrated for the N8DAH board, and I have to assume that board is the same as yours, and if it's not I've connected to A7 anyhow - mostly because I don't have a 50 microvolt signal for calibration.
All good here. Again, thanks.
73
Dan?
AG7GM
--
Dan D'Eon
AG7GM
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Here on the uBitx groups.io.
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Hi,
Apparently mine is far past due for failure. But it is okay because I have several 386s in the drawer. On the other had I may have one of the chips that was *not* an imposter. Those were mentioned by HF Signals. I have eluded the bogey man numerous times over the years. Been to war. Went to sea. Served the local fire dept for a long time. An audio amp that can't take the standard voltage and needs replacement seems kind of trivial.
73,
Bill KU8H
bark less - wag more
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On 6/30/20 12:40 PM, jim via groups.io wrote: er ...not quite ...my version 3 was wired directly to speaker (no trs jack for phone) and ran ONLY on 12 volts
amp failed after about 3 months ..simply overspecified chip ...pure and simple
Jim
On Tuesday, June 30, 2020, 8:00:52 AM PDT, MVS Sarma <mvssarma@...> wrote:
In v5 and v6? only lm386 has been used.
Even in ver 3? the component failed only because of plugging? mono external speaker pin into stereo socket.
Secondly it failed due to higher voltages lije 13.8 or more? appled to rig.
?Sarma vu3zmv
On Tue, 30 Jun 2020, 8:23 pm rajesh huddar, <pumerah@... <mailto:pumerah@...>> wrote:
Hi,
Has anyone tried to connect LM386 instead of the stock audio chip.
If I may request for the schematic.
Thanks
Rajesh
VU3RHU
On Tue, 30 Jun 2020, 20:01 BruceN, <k4tql@...
<mailto:k4tql@...>> wrote:
Where is here?
BruceN/K4TQL
--
"To invent, you need a good imagination and a pile of junk"? --
Thomas Alva Edison (1847-1931)
|
er ...not quite ...my version 3 was wired directly to speaker (no trs jack for phone) and ran ONLY on 12 volts
amp failed after about 3 months ..simply overspecified chip ...pure and simple
Jim
On Tuesday, June 30, 2020, 8:00:52 AM PDT, MVS Sarma <mvssarma@...> wrote:
In v5 and v6? only lm386 has been used.? Even in ver 3? the component failed only because of plugging? mono external speaker pin into stereo socket.? Secondly it failed due to higher voltages lije 13.8 or more? appled to rig.?
?Sarma vu3zmv
On Tue, 30 Jun 2020, 8:23 pm rajesh huddar, < pumerah@...> wrote: Hi,
Has anyone tried to connect LM386 instead of the stock audio chip. If I may request for the schematic.
Thanks
Rajesh VU3RHU On Tue, 30 Jun 2020, 20:01 BruceN, < k4tql@...> wrote: Where is here?
BruceN/K4TQL
--
"To invent, you need a good imagination and a pile of junk"? -- Thomas Alva Edison (1847-1931)
|
Hi,
My V3 has the original chip (not the one identified as sissy) and I run it from 13.8 volts regularly. I *never* plug/unplug earphones/speakers, key/paddles, mic, nor antenna with power turned on. If my audio chip does fail a 386 will take it's place.
73,
Bill KU8H
bark less - wag more
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Show quoted text
On 6/30/20 11:00 AM, MVS Sarma wrote: In v5 and v6? only lm386 has been used.
Even in ver 3? the component failed only because of plugging? mono external speaker pin into stereo socket.
Secondly it failed due to higher voltages lije 13.8 or more? appled to rig.
?Sarma vu3zmv
On Tue, 30 Jun 2020, 8:23 pm rajesh huddar, <pumerah@... <mailto:pumerah@...>> wrote:
Hi,
Has anyone tried to connect LM386 instead of the stock audio chip.
If I may request for the schematic.
Thanks
Rajesh
VU3RHU
On Tue, 30 Jun 2020, 20:01 BruceN, <k4tql@...
<mailto:k4tql@...>> wrote:
Where is here?
BruceN/K4TQL
--
"To invent, you need a good imagination and a pile of junk"? --
Thomas Alva Edison (1847-1931)
|
Rajesh Huddar,
I have been monitoring this board since 2018, and have not read of distorted audio solved by replacing the TDA2822.? I have read of failures like MVS Sarma has stated where they caused a failure of the TDA2822 and then decided to go to a different audio amp (LM386) or other amplifier modules off of the mainboard.?
Most of the distorted audio issues have been resolved by adjusting the BFO.? That would be where I would start before I tore into the board.
The above is just a suggestion, you will need to figure out if you can do the BFO adjustment as if it is done wrong it will make the situation worse.? A starting point (though the video is for the version 6) is the video on calibration from Ashhar Farhan:
NOTE: ONLY do the BFO correction, then see if it fixes the issue.? The zero beating process should not be required UNLESS you have verified that the frequency displayed does not match the actual frequency received AFTER you have set and tested the BFO setting.? On the versions prior to 6, this can be done through the settings menu.
NOT 2: The stock version 5 will go into transmit mode if you go into the Calibration step.? For version 5 be sure you have a dummy load connected if you are going to calibrate the frequency display.? It is also a good idea to always connect a dummy load or tuned antenna when calibrating.
MVSSarma gave good advice on being sure you understand what is to be done and that you agree with the diagnosis.? YOU are responsible for the operation of the uBITX you have.
Side Note: I own version 4 and version 5 uBITX.? I have not worked with version 3, so there may be details that I do not know about that could cause issues.? I have reviewed the schematics for the above advice.
Good luck, and enjoy the learning experience.
73
Evan
AC9TU
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Every uBitx I've looked at the schematic for, IF WIRED CORRECTLY, the wiper of the volume pot will go to the amp. Remove the existing wire from the wiper of the volume pot and run a new wire from the wiper of the volume pot to your new amp. Then disable the current amplifier - that will depend on which version of the uBitx you have.
Vince - K8ZW.
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On 06/30/2020 11:48 AM, Evan Hand wrote: Rajesh Huddar,
The short answer is yes, someone has. The bigger question is how to
connect the version that you have. The connection will depend on the
uBITX mainboard version. Version 5 and later already have the LM386 as
the audio amp.
If you have a version 3, then use the version 5 schematic to see how it
was done there. Here is part of the schematic with the audio amp:
There are also LM386 modules that could be added off-board. You will
need to run power, audio in, and speaker connection after removing the
TDA2822 chip and jumpering the empty socket pin 3 to 5. Connect the
LM386 module to the SPK and the speaker to the output of the module. Or
just insert the module between pin 3 and 5 of the empty TDA2822 socket.
You still need to connect power and ground, then adjust the gain control
on the module to not overdrive the speaker.
The alternative is to just replace the TDA2822 with a unit supplied by a
reputable supplier.
For version 4 with low audio, I just connected an audio amp on the
speaker connection of the mainboard with power and ground.
73
Evan
AC9TU
--
K8ZW
|
Rajesh Huddar, The short answer is yes, someone has.? The bigger question is how to connect the version that you have.? The connection will depend on the uBITX mainboard version.? Version 5 and later already have the LM386 as the audio amp. If you have a version 3, then use the version 5 schematic to see how it was done there.? Here is part of the schematic with the audio amp:  There are also LM386 modules that could be added off-board.? You will need to run power, audio in, and speaker connection after removing the TDA2822 chip and jumpering the empty socket pin 3 to 5.? Connect the LM386 module to the SPK and the speaker to the output of the module.? Or just insert the module between pin 3 and 5 of the empty TDA2822 socket.? You still need to connect power and ground, then adjust the gain control on the module to not overdrive the speaker. The alternative is to just replace the TDA2822 with a unit supplied by a reputable supplier. For version 4 with low audio, I just connected an audio amp on the speaker connection of the mainboard with power and ground. 73 Evan AC9TU
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I fell that calibration is not related to lm386 or tda2822 ir discrete audio.?
Some one said that. I say this ?Msny say many things. It is for you too to try to analyse.? Namaste.?
On Tue, 30 Jun 2020, 8:38 pm rajesh huddar, < pumerah@...> wrote: Hi?
Thanks for the revert. I wish to use LM386 as my audio is distorted and garbled.
Someone that I need to calibrate while another input is to use LM386.
Inputs will be much?appreciated.
Thanks
Rajesh VU3RHU
In v5 and v6? only lm386 has been used.? Even in ver 3? the component failed only because of plugging? mono external speaker pin into stereo socket.? Secondly it failed due to higher voltages lije 13.8 or more? appled to rig.?
?Sarma vu3zmv
On Tue, 30 Jun 2020, 8:23 pm rajesh huddar, < pumerah@...> wrote: Hi,
Has anyone tried to connect LM386 instead of the stock audio chip. If I may request for the schematic.
Thanks
Rajesh VU3RHU On Tue, 30 Jun 2020, 20:01 BruceN, < k4tql@...> wrote: Where is here?
BruceN/K4TQL
--
"To invent, you need a good imagination and a pile of junk"? -- Thomas Alva Edison (1847-1931)
|
Hi?
Thanks for the revert. I wish to use LM386 as my audio is distorted and garbled.
Someone that I need to calibrate while another input is to use LM386.
Inputs will be much?appreciated.
Thanks
Rajesh VU3RHU
In v5 and v6? only lm386 has been used.? Even in ver 3? the component failed only because of plugging? mono external speaker pin into stereo socket.? Secondly it failed due to higher voltages lije 13.8 or more? appled to rig.?
?Sarma vu3zmv
On Tue, 30 Jun 2020, 8:23 pm rajesh huddar, < pumerah@...> wrote: Hi,
Has anyone tried to connect LM386 instead of the stock audio chip. If I may request for the schematic.
Thanks
Rajesh VU3RHU On Tue, 30 Jun 2020, 20:01 BruceN, < k4tql@...> wrote: Where is here?
BruceN/K4TQL
--
"To invent, you need a good imagination and a pile of junk"? -- Thomas Alva Edison (1847-1931)
|
In v5 and v6? only lm386 has been used.? Even in ver 3? the component failed only because of plugging? mono external speaker pin into stereo socket.? Secondly it failed due to higher voltages lije 13.8 or more? appled to rig.?
?Sarma vu3zmv
On Tue, 30 Jun 2020, 8:23 pm rajesh huddar, < pumerah@...> wrote: Hi,
Has anyone tried to connect LM386 instead of the stock audio chip. If I may request for the schematic.
Thanks
Rajesh VU3RHU On Tue, 30 Jun 2020, 20:01 BruceN, < k4tql@...> wrote: Where is here?
BruceN/K4TQL
--
"To invent, you need a good imagination and a pile of junk"? -- Thomas Alva Edison (1847-1931)
|
Re: kit projects agc kit not working
email sent this morning, thank you Dave for the reply.
|
Hi,
Has anyone tried to connect LM386 instead of the stock audio chip. If I may request for the schematic.
Thanks
Rajesh VU3RHU
On Tue, 30 Jun 2020, 20:01 BruceN, < k4tql@...> wrote: Where is here?
BruceN/K4TQL
--
"To invent, you need a good imagination and a pile of junk"? -- Thomas Alva Edison (1847-1931)
|
Where is here?
BruceN/K4TQL
--
"To invent, you need a good imagination and a pile of junk"? -- Thomas Alva Edison (1847-1931)
|
Re: Ubitx v6.1 cat control
Michael,
I had issues with the FT-817 radio selection with my v5 uBITX.? I tried the Yeasu FT-857 radio with 38400 baud, 8 data bits, 2 stop bits, None for the handshake, PTT CAT, Mode USB, and None for Split.? That has worked for me.??The thing I have found to be the issue most of the time is the baud rate. The CH340 chip does not seem to work above 38400.
As far as I know, the CAT interface is the same for v5 as well as v6.? Also, I believe that HF Signals is still using the same Nano with the CH340G chip.
I would give the above a try.
73
Evan
AC9TU
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Re: Ubitx v6.1 cat control
I think this may be due to problems on the reset line of the nano. It should be documented so do a Google search as there are a number of solutions, depending on what will be best?for you.
On Mon, 29 Jun 2020, 20:05 John Sutter, < jds@...> wrote:
I haven't been able to get my ubitx 6.2 with Reed's FW working with
WSJT-x v2.2.1, though
it does work with FT-817 Commander. ? I haven't tried UBITX manager.
I started setting up a
serial protocol analyzer, but then the day job wanted attention.?
Maybe in another week or
two I'll have time to dig back into it.
I'd use FT-817 Commander to verify your port settings are correct
before digging deeper.
If you can't get that working, maybe it's driver problems with the
serial port pr a bad USB cable.
There are posts in the archives that a web search should turn up.
John
K6JDS
On 6/29/2020 10:34 AM, Michael Golden
wrote:
Hey everyone
#ubitx-help
I am trying to setup cat control with my ubitx
v6.1 and I can see the com port but WSJT-x can¡¯t get data
from it and UBITX manager can¡¯t read from it either.? Any
thoughts are appreciated
Get
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Re: shop.kit-projects AGC board. Seeking install instructions
No worries just happy it made it.
73
--
David
?N8DAH
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Re: shop.kit-projects AGC board. Seeking install instructions
Thanks, David. The Google works so well for me that it didn't occur to me that it tossed it in the spam folder. I found 3 messages!?
I'll need to get in the habit of checking there first before I start whining. :)
--
Dan D'Eon
AG7GM
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N8DAH
Dan D'Eon
Matt Towe
rajesh huddar