Date   

uBITX V6 CW Keyer #ubitxcw #ubitx #cw

Aaron K5ATG
 

I'm having a little issue hooking up a keyer to the uBITX and I'm pretty sure I'm either missing something or doing something wrong. When I plug in the keyer of just the cable to the keyer and put the uBITX on CW it just sends out a string of dahs. Any ideas will be helpful. 
Oh the keyer is a homebrew CW Keyboard (I have nerve damage and can't send CW) When I plug in a set of paddles it works as is should. 
--
'72
Aaron Scott
QRPARCI# 16443
GQRP# 16389
4SQRP # 1080


Re: Micro Bitx v6 DC jack

thomas.adair
 

Thank you, 73 KI5HZW



Sent via the Samsung Galaxy A10e, an AT&T 4G LTE smartphone


-------- Original message --------
From: "Bob Lunsford via groups.io" <nocrud222@...>
Date: 6/13/20 3:56 PM (GMT-06:00)
To: BITX20@groups.io
Subject: Re: [BITX20] Micro Bitx v6 DC jack

If you don't want to make a cable with the power connector, most big truck stops carry a cable designed to go from a cigarette lighter jack to a small TV, etc.  Just check to make sure the center conductor is positive. Many small power supplies like the ones sold by MFJ have the cig lighter jack on front panel and some portable jumper boxes sold for starting cars have the jack on them, too. Otherwise, some Elmer could show you. The center pin is positive, the shell is negative.

Bob — KK5R

On Saturday, June 13, 2020, 4:30:29 PM EDT, thomas.adair <thomas.adair@...> wrote:



How to I use the DC Jack provided with the kit? 


Sent via the Samsung Galaxy A10e, an AT&T 4G LTE smartphone


Re: Micro Bitx v6 DC jack

Bob Lunsford
 

If you don't want to make a cable with the power connector, most big truck stops carry a cable designed to go from a cigarette lighter jack to a small TV, etc.  Just check to make sure the center conductor is positive. Many small power supplies like the ones sold by MFJ have the cig lighter jack on front panel and some portable jumper boxes sold for starting cars have the jack on them, too. Otherwise, some Elmer could show you. The center pin is positive, the shell is negative.

Bob — KK5R

On Saturday, June 13, 2020, 4:30:29 PM EDT, thomas.adair <thomas.adair@...> wrote:



How to I use the DC Jack provided with the kit? 


Sent via the Samsung Galaxy A10e, an AT&T 4G LTE smartphone


Micro Bitx v6 DC jack

thomas.adair <thomas.adair@...>
 


How to I use the DC Jack provided with the kit? 


Sent via the Samsung Galaxy A10e, an AT&T 4G LTE smartphone


Re: uBitx V6 20M band problem #ubitxv6 #antennas

Evan Hand
 

belthur,

One other thought, The RF could be coming in through the mic cord.  A snap-on ferrite and 0.01 uF bypass caps on the input to the ubitx could help if that is the issue.

73
Evan
AC9TU


Re: uBitx V6 20M band problem #ubitxv6 #antennas

Evan Hand
 

Are you amplifying the mic at all?  Do you have another receiver that can be used to verify the output of the ubitx?

The only way to be sure is to measure the output.  What I have done is build a -50 db tap (My measurements were -45 db actual) to sample the output of the ubitx with an SDR (RSP1A) based spectrum analyzer.  If you have an SDR dongle of some sort, there are free SA software packages for them.  Here is the -50DB tap that I copied:
http://www.ad5x.com/images/Articles/Tap50dbRevA.pdf
I used a two-tone generator built from a kit to drive a BlueTooth speaker with the volume at about what I expected a person speaking to be, and then held the mic at about the expected distance from the speaker.  You may also need a step attenuator depending on the power of the amp.

Others have used another receiver with the ubitx connected to a dummy load and the receiver with little or no antenna to lower the input signal.  This works best if you have a waterfall display on the receiver.  Again, an inexpensive SDR dongle like an RTL-SDR can work.

I would first verify that you do not have any issues with the barefoot ubitx, then go on to the output of the amp.  When I did similar measurements for my rigs, I found that it was easy to overdrive both the audio and then the input to the amp.  I am currently waiting on a 7 element low pass filter for the amp, as the harmonic output was not within FCC requirements with an eBay 100watt LPF kit that was based on 5 element filters.  I also have a -6dp pad in the works to drop the output of the ubitx to below 5 watts.

FWIW
73
Evan
AC9TU


Re: uBitx V6 20M band problem #ubitxv6 #antennas

vu3gwn
 

Checked. CW is just fine. How do I avoid audio overdrive?


Re: uBitx V6 20M band problem #ubitxv6 #antennas

vu3gwn
 

Thanks. No, my uBitx case isnt grounded. I will fix that. I will also try a Balun. 

Thanks.


Re: uBitx V6 20M band problem #ubitxv6 #antennas

Evan Hand
 

My first guess would be RF back into the ubitx.  Especially since it is with the linear amp on.

Do you have the ubitx in a metal case, is it grounded, do you have a common mode choke on the coax to the antenna, and maybe a snap-on ferrite on the line to the amp?

Does CW have the same issue?  If not, then you could be overdriving the audio causing splatter which will feedback into the Nano control lines.

I would start by making sure the case of the ubitx is grounded.  Then I would do the CW test and verify that it is not overdriven audio.  If the problem is still there, then I would start looking for a common-mode current reduction on the coax lines.  For me at lower power snap-on ferrites around the coax have worked.  At the higher power, you may need to make an ugly current balun.
http://www.hamuniverse.com/balun.html

The above are just suggestions.  Your situation may not be the same as the ones that can cause the above, though it is most likely.
73
Evan
AC9TU


uBitx V6 20M band problem #ubitxv6 #antennas

vu3gwn
 

Added a 20m antenna to my Inverted V already having 40m. 
 
Now, I have 7150 in VFO:A and 14220 in VFO:B. 
 
When I give a TX, it will switch over to VFO:A in the middle of TX...
 
If I have 14220  in VFO:A, it just hangs. Not sure what's happening
 
Reloaded the Original firmware from github. No change. 

This happens only when I have my Linear Amplier switched on....
 
Anyone know why it's happening?


Re: uBitX on CW #v6

post.an.markus@...
 

Hello Vic and Reed,
at first please forgive my English, I'll try to do my very best.
My problem is, that my ubitx V6 only sends dits and no dahs. At least the audio output let's assume that.
I have tried to morse with my straight key and with the baofeng ptt-mic, which was sent along with the full kit.
I could not follow your conversation completely due to my lackings in English. -How can one solve this problem? Have you been succesful? Could you get your friend on air with cw properly?
Thanks a lot and kind regards from Germany
Markus, DO4DB


Re: Kit-Projects is Open!

Ashhar Farhan
 

Congratulations!


On Sat 13 Jun, 2020, 9:36 AM N8DAH, <Dherron@...> wrote:

We are back!

I have added some new colors of mini paddles and a new leg mount option. More is coming soon!

73
--
David

 N8DAH
Kit-Projects.com

Shop is open!


Kit-Projects is Open!

 

We are back!

I have added some new colors of mini paddles and a new leg mount option. More is coming soon!

73
--
David

 N8DAH
Kit-Projects.com

Shop is open!


Re: New uBitx 6.1 - Have I already blown the finals?

Robert D. Bowers
 

When I adjusted in my Bitx20, I used a fuse rated low enough that when I did overdrive the finals (the adjustment was a bit tricky - I think backwards to what I expected or something like that), the fuse blew.  That saved the finals!

Bob


On 6/12/20 6:57 PM, Gordon Gibby wrote:
be sure to read the directions carefully---plenty of people have flat KILLED those finals by doing this move wrongly.

Gordon


On Fri, Jun 12, 2020 at 12:25 PM Evan Hand <elhandjr@...> wrote:
I have been using 13.8 volts to finals, and a forward diode drop to the mainboard.  Either will work, it is getting the gate voltage to the correct value for the linear region of the IRF510.

73
Evan
AC9TU


Re: New uBitx 6.1 - Have I already blown the finals?

Gordon Gibby
 

be sure to read the directions carefully---plenty of people have flat KILLED those finals by doing this move wrongly.

Gordon


On Fri, Jun 12, 2020 at 12:25 PM Evan Hand <elhandjr@...> wrote:
I have been using 13.8 volts to finals, and a forward diode drop to the mainboard.  Either will work, it is getting the gate voltage to the correct value for the linear region of the IRF510.

73
Evan
AC9TU


Re: ubitxv6 mic not working fine #ubitxv6

rpremo
 

Thanks Evan Ill try this combo as well.

So whats working for me now (intermittent as I have a cheap plug which I need to replace with a better one).

Red (TX or Pin3 on microphone) to RING
Braid to ground/shield

With this configuration the microphone is mostly off until I PTT.  I think this might be the final config that worked once I replace the Plug.

Dave can you confirm your CLEAR is actually a wire or an open connection.  I interpreted it to be Yellow in my Microphone (which created intermittent TX), so I removed it and it seems to be indicating a better working config.


Re: ubitxv6 mic not working fine #ubitxv6

Evan Hand
 

I cannot comment on the wire color, however here is a link to the common 4 pin CB mic wiring:
https://www.wearecb.com/cb-microphone-wiring.html
Note that pin one of the 4 pin connector is ground for both the mic and the PTT switch.  Pin 2 is the mic, and pin 3 is the PTT line.

Pin 1 goes to the Sleeve of the 3.5 mm plug,
Pin 2 goes to the Ring of the plug
Pin 3 goes to the Tip of the plug.

You will need to take apart the 4 pin plug to get the wire colors for your mic.

73
Evan
AC9TU


Re: ubitxv6 mic not working fine #ubitxv6

rpremo
 

Thanks Jeff for the notes on wiring.  I followed this guide the result....

TX stay enabled all the time (PTT does nothing)
When I remove the Ground/braid it no longer transmits continuously and PTT works; however when I PTT it goes into the constant rattling TX almost like it's trying to Antenna tune (though obviously there is no tuner) or something.  I have the A channel on 80 meter.


Re: How to upgrade the firmware on V6.1 to give better GUI?

KD2QMZ
 

Nice if a variable resistor (potentiometer) of such value exists, so it can be increased/decreased accordingly, or a small circuit within the microphone housing.


On Fri, Jun 12, 2020 at 1:58 PM Ashhar Farhan <farhanbox@...> wrote:
R63, a 47 ohms resistor sets the mic gain. if you increase the mic gain, ti can lead to over-driven, splattering signal. if you are okay with that, then add a 10 ohms in parallel to it. that will increase the mic gain by a factor of 4.

On Fri, Jun 12, 2020 at 9:32 PM MVS Negi <mvsnegi66@...> wrote:
Thanks for the info. It covers so much. Yes the first thing I realised when I switched this rig on was that we need an AGC ! Please do post your experiences of the stuff that you are putting in. Eagerly waiting for the info..I operate an IC 7300 normally and in the noise I find the Bitx receiver pretty good. The transmission (mic) needs compression and a pre amp for sure.
Thanks a ton.
Mahendra

On Fri, Jun 12, 2020 at 7:52 PM Evan Hand <elhandjr@...> wrote:
For me, the two areas that the ubitx could use some hardware support for SSB is in the audio input and AGC.  There are mods on this board that highlight options.  I chose an amplified CB mic from Amazon for $25 to improve the mic volume level, and have a speech compressor module that I have not installed (note, I have 2 v4 and 1 v5 so it will not go to waste).  Here is a compressor based on the SSM2167 module:
https://groups.io/g/BITX20/message/57047
It is available on Amazon and eBay.

For the AGC, there are a number of options from audio-only, IF gain reduction, to RF gain reduction.   Again, I have not yet implemented any of these, though I have started on the AmatuerRadioKits AGC that is supplied with one of their cases.  I also purchased this:
https://shop.kit-projects.com/index.php?route=product/product&product_id=101
Neither are installed at this time, got sidetracked into SDR with the Hermes Light 2 radio.  Just recently getting back to moving my v5 from the homemade case (really ugly, my metalworking skills need a large improvement) to the Amateur Radio Kits case mentioned before.  This will be the first AGC implementation that I try.

For CW, the ubitx needs a better filter than the 2.7 KHz crystal filter.  The best option seems to be an audio filter like one of the SOTAbeams:
https://www.sotabeams.co.uk/dual-bandwidth-filter-modules-ssb-cw/
or homebrew like this:
https://groups.io/g/BITX20/message/72476
Again, no personal experience.  I would recommend searching this board and the internet for options.

One last comment, as long as you are willing to learn, the ability to backtrack with software changes is easy once you learn how to update a "sketch" per Ashhar Farhan's YouTube video for the v6.  There are a lot of .hex files that do not require the Arduino IDE, Xloader is one of the options that was covered in the HamsKey blog by Dr. Ian Lee (KD8CEC).  It really is not that hard, and will improve the usability of the rig.  If you are into CW, I would recommend that you at least try Reed's mod, as that improves both screen performance and makes it more intuitive for operation.

Above are my experiences and observations.  Yours may differ, so use at your own risk.
73
Evan
AC9TU


Re: How to upgrade the firmware on V6.1 to give better GUI?

Ashhar Farhan
 

R63, a 47 ohms resistor sets the mic gain. if you increase the mic gain, ti can lead to over-driven, splattering signal. if you are okay with that, then add a 10 ohms in parallel to it. that will increase the mic gain by a factor of 4.


On Fri, Jun 12, 2020 at 9:32 PM MVS Negi <mvsnegi66@...> wrote:
Thanks for the info. It covers so much. Yes the first thing I realised when I switched this rig on was that we need an AGC ! Please do post your experiences of the stuff that you are putting in. Eagerly waiting for the info..I operate an IC 7300 normally and in the noise I find the Bitx receiver pretty good. The transmission (mic) needs compression and a pre amp for sure.
Thanks a ton.
Mahendra

On Fri, Jun 12, 2020 at 7:52 PM Evan Hand <elhandjr@...> wrote:
For me, the two areas that the ubitx could use some hardware support for SSB is in the audio input and AGC.  There are mods on this board that highlight options.  I chose an amplified CB mic from Amazon for $25 to improve the mic volume level, and have a speech compressor module that I have not installed (note, I have 2 v4 and 1 v5 so it will not go to waste).  Here is a compressor based on the SSM2167 module:
https://groups.io/g/BITX20/message/57047
It is available on Amazon and eBay.

For the AGC, there are a number of options from audio-only, IF gain reduction, to RF gain reduction.   Again, I have not yet implemented any of these, though I have started on the AmatuerRadioKits AGC that is supplied with one of their cases.  I also purchased this:
https://shop.kit-projects.com/index.php?route=product/product&product_id=101
Neither are installed at this time, got sidetracked into SDR with the Hermes Light 2 radio.  Just recently getting back to moving my v5 from the homemade case (really ugly, my metalworking skills need a large improvement) to the Amateur Radio Kits case mentioned before.  This will be the first AGC implementation that I try.

For CW, the ubitx needs a better filter than the 2.7 KHz crystal filter.  The best option seems to be an audio filter like one of the SOTAbeams:
https://www.sotabeams.co.uk/dual-bandwidth-filter-modules-ssb-cw/
or homebrew like this:
https://groups.io/g/BITX20/message/72476
Again, no personal experience.  I would recommend searching this board and the internet for options.

One last comment, as long as you are willing to learn, the ability to backtrack with software changes is easy once you learn how to update a "sketch" per Ashhar Farhan's YouTube video for the v6.  There are a lot of .hex files that do not require the Arduino IDE, Xloader is one of the options that was covered in the HamsKey blog by Dr. Ian Lee (KD8CEC).  It really is not that hard, and will improve the usability of the rig.  If you are into CW, I would recommend that you at least try Reed's mod, as that improves both screen performance and makes it more intuitive for operation.

Above are my experiences and observations.  Yours may differ, so use at your own risk.
73
Evan
AC9TU

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