Date   
Re: QRP kit amplifiers

ajparent1/KB1GMX
 

On Sun, Mar 31, 2019 at 11:15 AM, Laurence Oberman wrote:
I will start with removing C84 to break the circuit and putting a 1uf
in series input to the 2n5109.

A ,1uf is sufficient.  Also yes to that connecting point.

I do not expect any improvement in harmonics or spurs as it will faithfully amplify
what is input.  Since I've measured what comes out the low pass filter (33mhz
low pass) at C80 you will get lots of harmonics if CW mode (especially 80/40/20m)
and spurs and harmonics in SSB mode.

Before you hook up the amp hooks your SA up to the C84 point to see what
is going into the amp and come out much bigger.

Allison

Re: How to connect ubitx microphone jack to soundcard output; now unsuppressed carrier in SSB or digital modes.

Karl Heimbach
 

I had a chance to troubleshoot my radio this weekend, but am unable to find TP20 on the board.  I've checked everything but the voltages suggested by Jerry.  Perhaps it is clearly marked, but my 65 year old eyes can't see it.
Also, does anyone have an idea of what could be used for replacing the surface mount diode, D5?  I suspect it is the problem with the unsuppressed carrier.

Thanks,

Karl, W5QJ

Re: Second Nano @ i2c for spectrum, meters, CW-decode, etc

Ted
 



Mike,

My attempts toe-mail you based on the QRZ-provided address get bounced back to me.
If you are still game to help me with this project, please email me at my call sign, at yahoo.com. Thanks very much.


73 

Ted
K3RTA

Re: How to connect ubitx microphone jack to soundcard output; now unsuppressed carrier in SSB or digital modes.

Evan Hand
 

Between C64 and C52 (the two large blue electrolytics on my v4 board.

Re: How to connect ubitx microphone jack to soundcard output; now unsuppressed carrier in SSB or digital modes.

Jerry Gaffke
 

Test points are not on the v3 uBitx boards, they got added with v4 (and remained on the v5).
TP20 is on T7 pins 3 and 5 at the modulator, that node goes down to the rx audio preamp and tx mike amp.
D5 is a BAT54S, a dual shottky diode in a SOT23 package:
    https://www.mouser.com/ProductDetail/ROHM-Semiconductor/BAT54SHMFHT116?qs=sGAEpiMZZMve4%2FbfQkoj%252BBH8K8w%2FUwM%252BgO5jDNJY7s8%3D

Jerry


On Sun, Mar 31, 2019 at 12:28 PM, Karl Heimbach wrote:
I had a chance to troubleshoot my radio this weekend, but am unable to find TP20 on the board.  I've checked everything but the voltages suggested by Jerry.  Perhaps it is clearly marked, but my 65 year old eyes can't see it.
Also, does anyone have an idea of what could be used for replacing the surface mount diode, D5?  I suspect it is the problem with the unsuppressed carrier.

Re: QRP kit amplifiers

Gordon Gibby
 

Maybe jump over all the other amplifiers and take advantage of the low pass filter’s after the final?




On Mar 31, 2019, at 14:58, ajparent1/KB1GMX <kb1gmx@...> wrote:

On Sun, Mar 31, 2019 at 11:15 AM, Laurence Oberman wrote:
I will start with removing C84 to break the circuit and putting a 1uf
in series input to the 2n5109.

A ,1uf is sufficient.  Also yes to that connecting point.

I do not expect any improvement in harmonics or spurs as it will faithfully amplify
what is input.  Since I've measured what comes out the low pass filter (33mhz
low pass) at C80 you will get lots of harmonics if CW mode (especially 80/40/20m)
and spurs and harmonics in SSB mode.

Before you hook up the amp hooks your SA up to the C84 point to see what
is going into the amp and come out much bigger.

Allison

Eureka!

Gary Rosenlieb
 

I have been trying to figure out what happened to my ver 5 for a good week now. Trying everyone's tips and still came up empty. So I sat and started reading through others problems and found mine. I ended up having the wrong firmware loaded. But without this group, dont know how long it would of taken.

So now I am tuning around listening to the contest!


Thanks,
Gary de KC8YJJ

Re: QRP kit amplifiers

Laurence Oberman
 

Yep, I will do that.
I can confirm that removing the PA section completely removed the
weird temperature induced spurious I was seeing on 20m. This is my
UBITX4 that had the heating issue Allison described.
This V4 still has original relays.
Thanks
Laurence

On Sun, Mar 31, 2019 at 5:19 PM Gordon Gibby <ggibby@...> wrote:

Maybe jump over all the other amplifiers and take advantage of the low pass filter’s after the final?




On Mar 31, 2019, at 14:58, ajparent1/KB1GMX <kb1gmx@...> wrote:

On Sun, Mar 31, 2019 at 11:15 AM, Laurence Oberman wrote:
I will start with removing C84 to break the circuit and putting a 1uf
in series input to the 2n5109.

A ,1uf is sufficient. Also yes to that connecting point.

I do not expect any improvement in harmonics or spurs as it will faithfully amplify
what is input. Since I've measured what comes out the low pass filter (33mhz
low pass) at C80 you will get lots of harmonics if CW mode (especially 80/40/20m)
and spurs and harmonics in SSB mode.

Before you hook up the amp hooks your SA up to the C84 point to see what
is going into the amp and come out much bigger.

Allison

Re: Kit-Projects mini mic and paddles!

 

Just put up more black mics.
--
David

 N8DAH
Kit-Projects.com

Shop is open!

Changing direction - ignition noise intractable #bitx40

Robert D. Bowers
 

I've given up on trying to use my Bitx40 as mobile.  Nothing I've done eradicates the ignition noise (and the alternator whine came back).  I've gone with direct power from the battery, extra grounding on the 'doghouse' of my van, plus extra grounding on the antenna base and vehicle frame.  I've tried filtering on the power, then multiple layers of filtering - then even a separate battery entirely (no connections to van).  I added chokes to the outside of the coax... trying to stop that as a source of entry.  I did find that the original grounding scheme for the doghouse (internal cover to the motor on a van - in my case a 90's GMC) was seriously insufficient and improving that reduced the ignition noise by probably 30db or so... but it's still way too loud to use the radio.  I even took the coax out of the van and ran it over to a table, where I had the radio.  As soon as the coax fitting touched the antenna connector, ignition noise.  (You could even faintly hear it with a piece of wire stuck in the antenna connector.)  At the same time, using an old TS-520 on my fan dipole, I could not hear the slightest bit of ignition noise, with the van parked only about 30-40 feet from the 40m portion of the antenna.  I could hear the contest, however.
                                                     
I'm really tickled with my BitX40... it's very sensitive and works pretty well (I haven't tried making contacts with it - yet, but the rx is good and filtering seems more than adequate).  What I did with it was put it in an old metal case (like a toolbox in a way), with battery, coax, and external noise filter/AGC.  It's pretty slick there - a complete portable kit in a box, as long as I have an external antenna along (a dipole would probably fight right in).    Someday I may try to shield the case that the radio came with... that might (or might not) be the problem.

I had to pull my 'good' radio (Alinco DX-70) from my shack for repairs, so I'm going to put it in place of the BitX40 in the van... it has a rock-crusher noise blanker and good filtering - once I get it back in operating condition. It should help a lot in solving the noise problem - maybe eliminate it. 

A couple of tips from this... first, the radio is awesome, but very sensitive to impulse-type noise.   The more barriers you can throw up between the noise source and the radio, the better!  That means chokes in the power line, filter caps, and so on - and if possible, shielded wires!  If I had the equipment (broadband spectrum analyzer), I'd characterize the noise - it may actually getting in somehow via a path besides the antenna and knowing the spectrum could give a clue as to how it gets in.  (I don't have a good bandpass filter right now, that might also be a trick to try.)

Second, if you're trying to go mobile, grounding grounding grounding!!!  While my best attempt (I don't have lots of time to throw at the radio) wasn't good enough, it might be good enough in another situation.  Ground everything you can... and don't just trust to bolted-together sheet metal (frame).  Also, usually drawing the power from a very low impedance source (direct to the battery) with good shielding and filters is the usual fix to the sort of noise I'm getting.  In this case, it wasn't enough.

So now I have an awesome portable (emergency) HF station, that works good - I just can't use it mobile in our van.  (Third tip: if it doesn't do what you'd like, find a use where it does!)

Re: Changing direction - ignition noise intractable #bitx40

MadRadioModder
 

Have you tried it in a different vehicle…?

 

 

From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of Robert D. Bowers
Sent: Sunday, March 31, 2019 7:07 PM
To: BITX20@groups.io
Subject: [BITX20] Changing direction - ignition noise intractable #bitx40

 

I've given up on trying to use my Bitx40 as mobile.  Nothing I've done eradicates the ignition noise (and the alternator whine came back).  I've gone with direct power from the battery, extra grounding on the 'doghouse' of my van, plus extra grounding on the antenna base and vehicle frame.  I've tried filtering on the power, then multiple layers of filtering - then even a separate battery entirely (no connections to van).  I added chokes to the outside of the coax... trying to stop that as a source of entry.  I did find that the original grounding scheme for the doghouse (internal cover to the motor on a van - in my case a 90's GMC) was seriously insufficient and improving that reduced the ignition noise by probably 30db or so... but it's still way too loud to use the radio.  I even took the coax out of the van and ran it over to a table, where I had the radio.  As soon as the coax fitting touched the antenna connector, ignition noise.  (You could even faintly hear it with a piece of wire stuck in the antenna connector.)  At the same time, using an old TS-520 on my fan dipole, I could not hear the slightest bit of ignition noise, with the van parked only about 30-40 feet from the 40m portion of the antenna.  I could hear the contest, however.
                                                     
I'm really tickled with my BitX40... it's very sensitive and works pretty well (I haven't tried making contacts with it - yet, but the rx is good and filtering seems more than adequate).  What I did with it was put it in an old metal case (like a toolbox in a way), with battery, coax, and external noise filter/AGC.  It's pretty slick there - a complete portable kit in a box, as long as I have an external antenna along (a dipole would probably fight right in).    Someday I may try to shield the case that the radio came with... that might (or might not) be the problem.

I had to pull my 'good' radio (Alinco DX-70) from my shack for repairs, so I'm going to put it in place of the BitX40 in the van... it has a rock-crusher noise blanker and good filtering - once I get it back in operating condition. It should help a lot in solving the noise problem - maybe eliminate it. 

A couple of tips from this... first, the radio is awesome, but very sensitive to impulse-type noise.   The more barriers you can throw up between the noise source and the radio, the better!  That means chokes in the power line, filter caps, and so on - and if possible, shielded wires!  If I had the equipment (broadband spectrum analyzer), I'd characterize the noise - it may actually getting in somehow via a path besides the antenna and knowing the spectrum could give a clue as to how it gets in.  (I don't have a good bandpass filter right now, that might also be a trick to try.)

Second, if you're trying to go mobile, grounding grounding grounding!!!  While my best attempt (I don't have lots of time to throw at the radio) wasn't good enough, it might be good enough in another situation.  Ground everything you can... and don't just trust to bolted-together sheet metal (frame).  Also, usually drawing the power from a very low impedance source (direct to the battery) with good shielding and filters is the usual fix to the sort of noise I'm getting.  In this case, it wasn't enough.

So now I have an awesome portable (emergency) HF station, that works good - I just can't use it mobile in our van.  (Third tip: if it doesn't do what you'd like, find a use where it does!)


Virus-free. www.avg.com

--

…_. _._

Re: Changing direction - ignition noise intractable #bitx40

Mike Short
 

Did you go to k0bg.com and do the bonding he recommended?
what case is your radio in? 
Is everything inside the radio grounded to a common ground? (Power, antenna, board, raduino, mic and key jacks, etc.)
his site has a section on ignition noise, spark plug wires, etc.
how is your antenna mounted?
do you have a common mode choke using the ferrite material and number of turns of coax through it?
where is this choke located?

mike

Re: Changing direction - ignition noise intractable #bitx40

Mike Short
 

Shielded cables are not the answer either.

Old ham needs help with setting bfo for ssb and cw on ubitx, CEC firmware

Kelly Mabry
 

Hi all,  I have been trying (without success) to calibrate the ubitx and set the bfo for ssb and cw since I installed the CEC firmware. I need a few pointers on how to do this.  Do I use wwv? Do I use the application written by dr. Ian Lee? I am not afraid because I have already backed up my original configuration per CEC firmware. And restored the settings a few times. You know what they say about insanity and doing the same thing over and over.  I am more concerned with the bfo settings than the alignment.  
Radio config: ubitx v5, CEC firmware 1.122, 3.5 Nextion enhanced display, no other mods yet.

73,

Kelly K5AID 

Re: Old ham needs help with setting bfo for ssb and cw on ubitx, CEC firmware

Laurence Oberman
 

Kelly
You calibrate the bfo by listening to the voice pitch.
It's a personal preference.
The carrier calibration is what you would use a reference like wwv for.
So find a very clear lengthy qso and adjust the bfo to your listening pleasure.
If you gave another reliever on at the same time switch to it and listen then switch back and set yours how you want.

Regards
Laurence


On Sun, Mar 31, 2019, 9:47 PM Kelly Mabry <kmabry2007@...> wrote:
Hi all,  I have been trying (without success) to calibrate the ubitx and set the bfo for ssb and cw since I installed the CEC firmware. I need a few pointers on how to do this.  Do I use wwv? Do I use the application written by dr. Ian Lee? I am not afraid because I have already backed up my original configuration per CEC firmware. And restored the settings a few times. You know what they say about insanity and doing the same thing over and over.  I am more concerned with the bfo settings than the alignment.  
Radio config: ubitx v5, CEC firmware 1.122, 3.5 Nextion enhanced display, no other mods yet.

73,

Kelly K5AID 

Re: Old ham needs help with setting bfo for ssb and cw on ubitx, CEC firmware

brad martin
 

Here is what I did,  The smarter people can let me know if I can do it better.

I first tune to WWV (5mhz is the one I used last time.)
There are 2 tones that come on at different times.  One is 500hz and other is 600hz.  These run for a minute each.
I set the ubitx to calibrate BFO and open fldigi with the output going into the input of my computer.
I wait for one of the tones to come in and tune the bfo to the 500hz mark in fldigi.
If the second tone comes in at 600hz I save the calibration and then I’m done.
If the second tone comes in at 400hz I tune the bfo to get that tone to the 500hz mark and then save.

I notice that when I save that it immediately goes about 40hz lower.  For example, Tone is spot on at 500hz and then I save and the tone jumps to 540hz.  I verified this with others using commercial rigs and I’m off about 40hz from theirs.  I mostly do digital so its not a problem for me but I notice that if I do SSB that I have to tune my radio down that extra 40hz or the sound is off.  I hear someone on 7.240, I tune to 7.239.950

Brad

On Sun, Mar 31, 2019 at 9:47 PM Kelly Mabry <kmabry2007@...> wrote:
Hi all,  I have been trying (without success) to calibrate the ubitx and set the bfo for ssb and cw since I installed the CEC firmware. I need a few pointers on how to do this.  Do I use wwv? Do I use the application written by dr. Ian Lee? I am not afraid because I have already backed up my original configuration per CEC firmware. And restored the settings a few times. You know what they say about insanity and doing the same thing over and over.  I am more concerned with the bfo settings than the alignment.  
Radio config: ubitx v5, CEC firmware 1.122, 3.5 Nextion enhanced display, no other mods yet.

73,

Kelly K5AID 

--

Re: Old ham needs help with setting bfo for ssb and cw on ubitx, CEC firmware

Laurence Oberman
 

From online reference.

. Setting the BFO

  • Click on the encoder button to display the menu, rotate it to the “Setup On?” and click on to confirm it
  • Tune to an clean and preferably weak SSB signal to its loudest (not the clearest)
  • Click on the encoder button again to display menu and choose  Theoption ‘Set the BFO’. Click to enter this option
  • Now tune with the encoder for the best sounding audio
  • Press PTT to save the calibration.

Done.


On Sun, Mar 31, 2019, 9:57 PM Laurence Oberman via Groups.Io <oberman.l=gmail.com@groups.io> wrote:
Kelly
You calibrate the bfo by listening to the voice pitch.
It's a personal preference.
The carrier calibration is what you would use a reference like wwv for.
So find a very clear lengthy qso and adjust the bfo to your listening pleasure.
If you gave another reliever on at the same time switch to it and listen then switch back and set yours how you want.

Regards
Laurence


On Sun, Mar 31, 2019, 9:47 PM Kelly Mabry <kmabry2007@...> wrote:
Hi all,  I have been trying (without success) to calibrate the ubitx and set the bfo for ssb and cw since I installed the CEC firmware. I need a few pointers on how to do this.  Do I use wwv? Do I use the application written by dr. Ian Lee? I am not afraid because I have already backed up my original configuration per CEC firmware. And restored the settings a few times. You know what they say about insanity and doing the same thing over and over.  I am more concerned with the bfo settings than the alignment.  
Radio config: ubitx v5, CEC firmware 1.122, 3.5 Nextion enhanced display, no other mods yet.

73,

Kelly K5AID 

Re: Second Nano @ i2c for spectrum, meters, CW-decode, etc

Kelly Mabry
 

Ted, I am planning the same mod to my V5 ubitx.  As I understand it, there are 3 methods(Videos). One is via the LCD so we disregard that video, but it has info on how to prepare the connections. Dr. Lee's blog talks about these methods in depth.  One of the Nextion display blog speaks about the method you referred to.  Lastly there is the third method which speaks of the 2nd nano sending Information to the Nextion display (3rd video). It also provides detailed Information on his blog.

http://www.hamskey.com/2018/08/standalone-signal-analyzer-i2c-type.html?m=1

Be sure to use the updated v.07 i2c signal analyzer  firmware on the second  nano.
Hope this helps. 
73,
Kelly K5AID 

Re: Old ham needs help with setting bfo for ssb and cw on ubitx, CEC firmware

Kelly Mabry
 

Brad, I bet i have been using the wrong tones to zero beat! Never figured out digital modes... and to be honest i don't have a power supply to use my ts590sg as a 2nd receiver until i finish the new shack. Have to buy another station PS. Having to use a shoestring budget to do this all.  But that is why this is fun.

And Laurence, i will try that for ssb. I am guessing for  CW upper and lower, I would try to zero beat the cw signal, then tune for best sound? CEC firmware has cw_upper and cw_lower.

Loving the radio, digging the ifs, and the att functions with the Nextion screen. I play around with it every day. Time to break out the paddles and do some cw. 

73, 
Kelly K5AID 

Re: Eureka!

Ashhar Farhan
 

The band was dead here. Our team managed just 150 contacts on 14 mhz. 


On Mon 1 Apr, 2019, 3:13 AM Gary Rosenlieb, <kc8yjj@...> wrote:
I have been trying to figure out what happened to my ver 5 for a good week now. Trying everyone's tips and still came up empty. So I sat and started reading through others problems and found mine. I ended up having the wrong firmware loaded. But without this group, dont know how long it would of taken.

So now I am tuning around listening to the contest!


Thanks,
Gary de KC8YJJ