Mike
While the BITX is not built in modular fashon, you can test it as if it were modules.?
From the volume potentiometer to speaker can be regarded as a module, and tested by inserting a <=1V audio signal at the top of the audio potentiometer.??
You will need a rf detector probe to measure output of the BFO oscillator.? There are on-line instructions for buildindg your own.??
Using a 100 pf capacitor you can inject RF ahead of the BFO mixer and should hear that on the speaker...assuming that your audio and BFO sections tested good.??
Then move the RF input upstream toward the antenna and verify that each sectiom works.??
Once you understand how each part of the circuit works it is not that complicated to troubleshoot.? Take your time and think through what you are doing...and ask questions here if you need more help.??
Arv. K7HKL _-_
On Thu, May 23, 2019, 11:49 PM Michael Herron < k7mh@...> wrote: I have a Bitx 40 I am troubleshooting that a friend put together. The display comes on okay and covers the entire 40 meter band when I tune it. I do not get any indication of it receiving nor any volume out of it with the volume control and an 8 Ohm speaker soldered to the speaker leads.
I have watched the troubleshooting video. I do not get any noise touching a probe to the center conductor of the SO-239 and no antenna attached. I also do not get any noise when touching the probe to C107.
The video does not talk about what to look for if that occurs.
I was hoping that someone would have some ideas where to start out with this problem. I have checked the volume control a couple times and it is wired correctly. I have not yet checked the current draw of the radio
as I will have to dig up a power cable I have for doing just that.
Any assistance or tips on figuring this out is much appreciated.
Mike K7MH.
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Re: FS: uBITX V5 in Beautiful Case - New!
UBitx 130 from hfsignals? Sunil case probably $30for case $30 to ship =$60 Nextion screen =$30 Ish? That¡¯s $210 already.?
With build time and other misc things needed to build radio, $250 sounds fair for something already built and working. Especially if mods were done too. I¡¯m sure there is a buyer for this.?
Joe Kd2nfc?
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On May 23, 2019, at 4:04 PM, Balasubramanyan Cp < bsnvu2yc73s@...> wrote: GOOD.? But, I think that IT IS EXPENSIVE APPROACH ?? ... except Om FARHAN's uBITX QRP M/Band assembled Board.? Am I correct ? 73s On Wed, May 22, 2019 at 1:33 AM PeteWK8S via Groups.Io <pmeier= [email protected]> wrote: Version 5 uBITX - in AmateurRadioKits Black Universal Case with 2.8 in Touch Display and Kit-Projects AGC/S-Meter board, USB and Mouse/Keyboard Interfaces installed. Control by touch and/or mouse/keyboard. Using W0EB/W2CTX firmware and Teensy 3.6 micro.? The radio works great and puts out around 12 watts.Features include USB, LSB, CB, Digital Capable, 40 memories, Pass Band Tuning, S-Meter, AGC Fast/Slow/Off, Dual VFOs, Split, RIT, Interrupt driven CW with adjustable T/R Delay with reliable smooth keying. Using W0EB/W2CTX firmware and Teensy 3.6 micro with plenty of open I/O pins for further expansion or experimentation.
Just completed this build so all is brand new and working well - about 12W. But due to unexpected extensive home repairs starting now I have to part with a few things.?
V5 uBITX Transceiver $250 plus ship?
V5 Raduino (unused) $30 plus ship
AmateurRadioKits Universal Case Front Plate (Black) for Raduino 2 line LCD (was not used for for above build). $10?
<uBITX_Inside.jpeg><uBITX_Rear.jpeg><uBITX_Front.jpeg>
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I have removed all modifications (which were only to speaker and mic via capacitors) - no change
I have replaced the audio amp - no change
I have reloaded the original software - no change
My scope is not very good (only 20MHz) but checking the clocks CLK#0 is at 12MHz about 1v p-p on main boad
Using my frequency counter I get CLK#1 switching between 33MHz and 57MHz (USB/LSB)
and CLK#0 at 59.1 MHz when tuned to 14.1MHz which is the correct 45MHz tuning and the frequency changes with tuning
So although I cant check the waveshape and amplitude (dont know what amplitude is should be but si5351 datasheet indicates 0.6 VOL to 3.3-0.6 VOH)
Something has definately changed on the board and I can hear soft 'clicks' as I tune the frequency, the audio signal is very quiet but I can tune signals. There are now whistles at some specific frequencies where as I tune the tone chages with each 100Hz tuning step. e.g.
14,180.7 audio tone perhaps 5Khz
14,180.6 audio tone perhaps 2KHz
14,180.5 audio tone perhaps 1Khz
14,180.4 audio tone perhaps 500hz
Any help with what to test would be a great
Thanks to all - Bob
So something is wrong
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Re: do you every visit bitxmap.com?
#poll
On Fri, May 24, 2019 at 02:09 AM, <kevintg51@...> wrote:
Hi Doug, If you have a paypal account let me know.
Kevin, Thanks for the offer.? If my post came across that I was soliciting donations that was not the attempt.? I am happy to make this small contribution to the community as long as it is useful. ? --
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Re: add yourself to the new BITX operators map
Was not aware of the site till now.? Just added my listing.? TNX for the effort!
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What have you found out. Perhaps a loose wire on the audio jack where it leaves the main board. Wiggle it. I doubt if it is serious.
I had a low whine on one used radio and vfo was off about 2kc. I could hear the stations but the whine was persistent. Perhaps you mods are pulling the voltage too low or worse injecting some power into the ubitx.
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Does it transmit ?
If not check the VFO connection from Raduino to board at DDS1.
Raj
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At 24/05/2019, you wrote: I have a Bitx 40 I am troubleshooting that a friend put together. The display comes on okay and covers the entire 40 meter band when I tune it. I do not get any indication of it receiving nor any volume out of it with the volume control and an 8 Ohm speaker soldered to the speaker leads.
I have watched the troubleshooting video. I do not get any noise touching a probe to the center conductor of the SO-239 and no antenna attached. I also do not get any noise when touching the probe to C107.
The video does not talk about what to look for if that occurs.
I was hoping that someone would have some ideas where to start out with this problem. I have checked the volume control a couple times and it is wired correctly. I have not yet checked the current draw of the radio
as I will have to dig up a power cable I have for doing just that.
Any assistance or tips on figuring this out is much appreciated.
Mike K7MH.
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Re: do you every visit bitxmap.com?
#poll
Hi Doug, If you have a paypal account let me know.
Love this little uBitx.
Cheers
Kevin VK2KTG
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I have a Bitx 40 I am troubleshooting that a friend put together. The display comes on okay and covers the entire 40 meter band when I tune it. I do not get any indication of it receiving nor any volume out of it with the volume control and an 8 Ohm speaker soldered to the speaker leads.
I have watched the troubleshooting video. I do not get any noise touching a probe to the center conductor of the SO-239 and no antenna attached. I also do not get any noise when touching the probe to C107.
The video does not talk about what to look for if that occurs.
I was hoping that someone would have some ideas where to start out with this problem. I have checked the volume control a couple times and it is wired correctly. I have not yet checked the current draw of the radio
as I will have to dig up a power cable I have for doing just that.
Any assistance or tips on figuring this out is much appreciated.
Mike K7MH.
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Re: uBITx Control circuit...
Bill,
Did you create a PCB for this, or should I just go ahead and do one for myself?
Matthew Pitts N8OHU
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Just a heads up. Do NOT use the battery pack and have any power in the DC jack. You will have a melt down.
 
--
David
?N8DAH
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Re: do you every visit bitxmap.com?
#poll
Doug
thank you!? I visited and managed to add my icon.? nice to see the global distribution of folk.?
73 Curt
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Re: do you every visit bitxmap.com?
#poll
I had registered, and forgot about it.? Nice to have, however would not spend money on it.
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Re: do you every visit bitxmap.com?
#poll
Forgot all about it.? But didn't use it much when it was first started.? I backed it up a number of times but that was it.? Don't think I even automated that.
Vince - K8ZW.
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do you every visit bitxmap.com?
#poll
About 2 years ago I thought it would be useful to have a map where BITX owners could pin their location.? In that time we¡¯ve had over 450 users added to the map.? Shortly after setting up the map in google maps I registered? which redirects to the map page.? The domain name is coming up for renewal and it got me thinking.? Is anyone using the map?? It shows over 26k views but most of that was in the beginning.? I don¡¯t mind renewing the domain name for another year but I¡¯d like to think someone actually visits the map every now and then.
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Re: Inexpensive eBay Amplifier Kits
Thank for this Karl. It is much appreciated. 73,? Terry - KB8AMZ Brimfield Twp, OH USA EN91hd Linux User# 412308, Ubuntu User# 34905,?PCARS#78, NAQCC#6668, QRP-ARCI#8855, SKCC#14195
On Wed, May 22, 2019 at 9:48 PM Karl Heinz Kremer, K5KHK < khk@...> wrote: There is an English version of the document:?
--
Karl Heinz - K5KHK
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Thank you WoodJr for the new glcd library. Looks good now!
Rob PA0RBL
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Re: FS: uBITX V5 in Beautiful Case - New!
GOOD.? But, I think that IT IS EXPENSIVE APPROACH ?? ... except Om FARHAN's uBITX QRP M/Band assembled Board.? Am I correct ? 73s
On Wed, May 22, 2019 at 1:33 AM PeteWK8S via Groups.Io <pmeier= [email protected]> wrote: Version 5 uBITX - in AmateurRadioKits Black Universal Case with 2.8 in Touch Display and Kit-Projects AGC/S-Meter board, USB and Mouse/Keyboard Interfaces installed. Control by touch and/or mouse/keyboard. Using W0EB/W2CTX firmware and Teensy 3.6 micro.? The radio works great and puts out around 12 watts.Features include USB, LSB, CB, Digital Capable, 40 memories, Pass Band Tuning, S-Meter, AGC Fast/Slow/Off, Dual VFOs, Split, RIT, Interrupt driven CW with adjustable T/R Delay with reliable smooth keying. Using W0EB/W2CTX firmware and Teensy 3.6 micro with plenty of open I/O pins for further expansion or experimentation.
Just completed this build so all is brand new and working well - about 12W. But due to unexpected extensive home repairs starting now I have to part with a few things.?
V5 uBITX Transceiver $250 plus ship?
V5 Raduino (unused) $30 plus ship
AmateurRadioKits Universal Case Front Plate (Black) for Raduino 2 line LCD (was not used for for above build). $10?
  
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Re: Antuino battery voltage
There is a problem on the DC jack. The assembly girls couldn't get the DC jack onto the pcb, so, they, er, drilled a bigger hole and destroyed the PTH. There is no connection between bottom and top tracks of one of the DC jack pins. Take an iron and flow as much solder as you can on the top layer of the PCB so that it catches the tab on the top and spills over the mounting tab (on the top tracks). Here is picture of which tab is the problem
On Thu, May 23, 2019 at 5:59 AM David Wilcox via Groups.Io <Djwilcox01= [email protected]> wrote: Bruce,
I was in error.? Rechecked the battery voltage tonight and it is 9.45 v with the new batteries.? I thought it had only 4 AA batteries in the internal battery holder but on second look there are 6 AA batteries.??
Still won't work from the battery pack.? Does work using the external power jack and 9 v battery.??
Will have to take more time and look into it.
Dave K8WPE
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Re: Raduino frozen on BITX40
Perhaps hf signals can send a raduino cheaper. Try once , before landing on an 30$ item.
On Thu, 23 May 2019, 5:05 pm < e78cb@... wrote: Thanks Sarma for advice. My Arduino load only on "old bootloader" as it was the case before so this is nothing new. I tried to upload original sketch again but I have some problems during compiling because of new version of the program ( v2 vs v1).. could not bother about that...?? However, I succeeded to upload Raduino diagnose program and it showed only VFO potentiometer is registered to work fine in position, but no frequency or any other readout happens. Later I uploaded couple of Si5351 diagnose and example programs for testing of 5351 but everyone gave only blank screen... Reading the privious posts I understood that Si5351 works in 2.6V range and that 4.5-5V can easily kill it, which probably did happend, so probably every program for Arduino that use Si5351 (every skatch!) just stay frozen at the biginning although it is loaded fine.. The voltages arround Si5351 now are fine, but must be that I fired it before by accidently connecting 4.5V to it and now it is blanked.. As I am not very handy with SMT to change this chip alone, I am thinking of buying new DDS for arround 35 USD.. these looks interesting for BITX40: ?? Will see..? my enclosure arrived today.. Srdjan, E78CB?
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_Dave_ AD0B
Raj vu2zap
N8DAH
Terry Morris
