Do you have access to a scope to see if any signal is getting to the 386? If you don't have one, check your local community college/university or even high school physics class and ask if you could use it for a few minutes. The alternative is to try another chip. I'm sure you've already checked the supply voltage to the amp. I'm not an EE guy, but maybe someone else has some ideas.
Jack, W8TEE
From: "ab1br@... [SoftwareControlledHamRadio]"
To: SoftwareControlledHamRadio@...
Sent: Friday, June 10, 2016 9:41 AM
Subject: [SoftwareControlledHamRadio] Re: Purpose of R8?
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OK on R8; thanks Hank.? Still have no audio output from the 49er. I do have a connection from C8 to pin 3 of LM386, so thats not it. ?Any ideas or thoughts welcome.
Thanks, Jim-AB1BR
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OK on R8; thanks Hank.? Still have no audio output from the 49er. I do have a connection from C8 to pin 3 of LM386, so thats not it. ?Any ideas or thoughts welcome.
Thanks, Jim-AB1BR
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Yep, I understand what you're saying. Oddly, some kit seem to have an offset and others don't. I can't tell what the difference is.
Jack, W8TEE
From: "louvoerman@... [SoftwareControlledHamRadio]"
To: SoftwareControlledHamRadio@...
Sent: Thursday, June 9, 2016 7:22 PM
Subject: [SoftwareControlledHamRadio] Re: RIT Offset Question
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Jack,
Yes a 2n2222 will also work ;-)
Just a quick note - the mod does not implement RIT although it could be considered a first step to doing so. It implements a user defined (at compile time) frequency offset between transmit and receive. This allows you to tune in a signal and be on frequency with a tone heard in your earphones. Without the mod, to be on frequency with another ham you will be exactly zero beat and hear a whooshing sound!
Lou? W2ROW
---In SoftwareControlledHamRadio@..., wrote : Lou:
In your PDF that shows the mod on the key line for the Forty-9er, it shows the transistor as a 2N222. I'm assuming this is a 2N2222, right?
Jack, W8TEE
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The purpose of the R7, R8, C7 circuit going from the 12v bus to pin 26/A7 of the Arduino is to act as a voltage divider for the Arduino to sense then display the?input voltage.
Buried in the documentation for the Forty-9er is a line that the circuit was added to act as a voltmeter but the code hadn't been implemented yet. Jack and company have been very busy and just haven't gotten around to it. I'm in the process of writing that code and will let y'all know when it is ready. Version 1 will be just a voltmeter. For Version 2 I have some ideas to add undervolt and overvolt warnings.
As of right now I'd just ignore it. Ran the numbers for the voltage divider and no matter what the setting of R8 is there is no chance of damaging the Arduino as long as you don't apply more than 15v.
Till later Hank K5HDE
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Jack, Yes a 2n2222 will also work ;-) Just a quick note - the mod does not implement RIT although it could be considered a first step to doing so. It implements a user defined (at compile time) frequency offset between transmit and receive. This allows you to tune in a signal and be on frequency with a tone heard in your earphones. Without the mod, to be on frequency with another ham you will be exactly zero beat and hear a whooshing sound! Lou? W2ROW ---In SoftwareControlledHamRadio@..., <jjpurdum@...> wrote : Lou:
In your PDF that shows the mod on the key line for the Forty-9er, it shows the transistor as a 2N222. I'm assuming this is a 2N2222, right?
Jack, W8TEE
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Thanks for clearing things up for me. A little slow at times. But when you mentioned tomtom or whatever on eBay, I checked their VFOs to see what you were using. :) ? As for the 49er, its the most cloned thing alive! I even saw one with wi-fi in it! Back to tinkering with the 49ers.? Thanks Bo
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I built my radio per the March QST article.??I did?buy the??PCB and Parts Kit from K2ZIA but I bought most of my components from BangGood.com.? They had the AD9850 DDS for about $10 and the NANO for $3 with free shipping.? To answer your final question... No the complete VFO boards they sell on EBAY are not the same as the ones in the article. Bill
-- Note: I prefer THIS email address over my? e-mail address 'Bo' Barry
Assoc. Prof. Emeritus!! (=free parking @ UNCC) Engineering? Technology Dept. Univ. of NC @Charlotte Charlotte, NC 28223 (704) 792-7427 cell #
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Lou:
In your PDF that shows the mod on the key line for the Forty-9er, it shows the transistor as a 2N222. I'm assuming this is a 2N2222, right?
Jack, W8TEE
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I built my radio per the March QST article.??I did?buy the??PCB and Parts Kit from K2ZIA but I bought most of my components from BangGood.com.? They had the AD9850 DDS for about $10 and the NANO for $3 with free shipping.? To answer your final question... No the complete VFO boards they sell on EBAY are not the same as the ones in the article. Bill
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The 12V circuit that divides down using a 20K ohm in series with R8, 10K trimmer potentiometer. It apparently adjusts the voltage level on pin 26 (A7) of the Arduino Nano chip. What does this do and what should the voltage be adjusted too using R8? Seems an elabortate circuit simply to condition input pin 26. Should pin 26 be logic HIGH or LOW?
Trying to get my 2nd 49er finished yesterday to output audio. Still no luck.
Thanks, Jim-Ab1BR
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No. The VFO we did for the article is based on the design by Dennis Kidder, W6DQ, who was co-author with me on the Arduino Projects?for Amateur Radio book. Farrukh modified Dennis' design when he added a second buffer transistor.
Jack, W8TEE
From: "Bo Barry bobarr@... [SoftwareControlledHamRadio]"
To: "SoftwareControlledHamRadio@..."
Sent: Thursday, June 9, 2016 9:13 AM
Subject: Re: [SoftwareControlledHamRadio] Mystery of R-0 ZERO
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Whoops, still confused here. Thought you were talking about the VFO FROM eBay, which sounds different from the one in the article, from what I found on eBay from that seller. As for the 49er, I'll look at it. I've noted a couple different versions, the schematic and board versions are different. Maybe I'll figure out something. Last question, is the eBay vfo the same as used in the article?
73 W4GHV? On Thursday, June 9, 2016, ab6ui@... [SoftwareControlledHamRadio] < SoftwareControlledHamRadio@...> wrote:
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Yes I did March QST QRP 49er XCVR project but did not use the sources listed in it...?? The 49er board I have is? identical to the one described in the article with the exception of R0... In talking to Farrukh there are a few different versions out there... Bill
-- Note: I prefer THIS email address over my? e-mail address 'Bo' Barry
Assoc. Prof. Emeritus!! (=free parking @ UNCC) Engineering? Technology Dept. Univ. of NC @Charlotte Charlotte, NC 28223 (704) 792-7427 cell #
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Whoops, still confused here. Thought you were talking about the VFO FROM eBay, which sounds different from the one in the article, from what I found on eBay from that seller. As for the 49er, I'll look at it. I've noted a couple different versions, the schematic and board versions are different. Maybe I'll figure out something. Last question, is the eBay vfo the same as used in the article?
73 W4GHV?
On Thursday, June 9, 2016, ab6ui@... [SoftwareControlledHamRadio] < SoftwareControlledHamRadio@...> wrote:
?
Yes I did March QST QRP 49er XCVR project but did not use the sources listed in it...?? The 49er board I have is? identical to the one described in the article with the exception of R0... In talking to Farrukh there are a few different versions out there... Bill
-- Note: I prefer THIS email address over my? e-mail address 'Bo' Barry
Assoc. Prof. Emeritus!! (=free parking @ UNCC) Engineering? Technology Dept. Univ. of NC @Charlotte Charlotte, NC 28223 (704) 792-7427 cell #
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For some reason when I "ohmed" There was no continuity from top of C8 (junction of C8/L1) to Pin 3 of the LM386.? So until I added that jumper I had no audio... Once I did it worked fine... Thanks, Bill
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Keep me posted on your progress with the 20M rig!
Bill
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Yes I did March QST QRP 49er XCVR project but did not use the sources listed in it...?? The 49er board I have is? identical to the one described in the article with the exception of R0... In talking to Farrukh there are a few different versions out there... Bill
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ab6ui
I'm not sure why you needed the jumper wire?? I believe I have the exact same PCB as you.? There is a PCB trace from the top of C8 (junction of C8/L1) that goes to Pin 3 of the LM386.? It is partially blocked in the photo you posted, but I believe it is there.? R0 is in parallel with C8 and both are across the input of Pin 3 of the LM386 to ground.? I did not install R0 on my 49er.
Dave, W0DF
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Did you do the March QST QRP XCVR or what?? I bought my parts from the sources in the article not eBay. How did you interface the eBay vfo to the 49er? 73,Bo W4GHV?
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Not that is really odd. Why would the kit distributer make that change? Thanks for the heads up. Cool that you found the problem, worked out the issue, and fixed it. ? Haven't started on my own transceiver yet. Got a couple small kinks to work out in the VFO, then I'll start on the rig. Got another rig kit on the way and down the road put it on 20m. I'm sure I'll pull out what little hair I have left making that happen. ? Till later Hank K5HDE
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Whoops. Thought you were doing the March QST project. What xcvr are you using and how did you add that vfo you mentioned to it? ?Progress? ?73. W4GHV Bo?
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In trying to track this mystery down I found that?R0?goes to Pin 3 of U3 to ground and apparently nowhere else?? Obviously why I had no audio... So I lifted R0 and added a jumper wire from L1 and C8 to pin 3 of LM386 and now it is working.? The ebay seller was tomtop.wholesaler.?So?you know what to look for I have attached a photo with a close up of R0?
Hope this helps anyone else that receives a board with R0
72?DE AB6UI?
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Re: Questions/errors in Arduino sketch
I had a new idea for mine. Which basically works except at night. I have a couple bandpass filters and the software changed to cover all freqs. I'm going to use the low level VFO output as a signal generator to check the filters and perhaps sensitivity.
Good luck on yours. Bo. ?W4GHV?
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jjpurdum