Date   

MVS Sarma
 

Even by using T30-6 , we get near by value  not exact value. balance is by adjusting the turn locations  etc and Farhan calls it tweaking.


On Sat, Nov 2, 2019 at 2:44 AM Woody <woody@...> wrote:
On 11/1/2019 19:12, circular.simetry@... wrote:
Hello everybody, i have build a homebrew ubitx and i am working now on the LPF the original uses T30-6 toroids i have available only T37-6 does anybody know how many turns i have to wind?

This might help...  Go to   https://toroids.info/
Enter  T30-6 toroid and the number of turns
Get the inductance
Enter T37-6 toroid and the inductance
Get the number of turns.
Caveat - Due to the difference in core sizes, it might not be possible to obtain an exact inductance match.

Woody, KZ4AK
KZ4AK.com
--

Curt
 

Thanks Allison for clariying. Based upon the message title, I am thinking the application here is a homebrew project. As for the exact number of watts, well enough is involved that I imagine merely a good irf510 amplifier is being sought. I think I recommended the best one around that uses a printed board.

73 curt

Re: uBitx V3 low power continues

Ashhar Farhan
 

Does the receiver work well? Are stations clear?


On Sat 2 Nov, 2019, 7:51 AM ajparent1/KB1GMX, <kb1gmx@...> wrote:
If the problem is 20M only its either a filter issue or a relay issue for 20M only.

Not a lot of parts but I've seen the same complaint for 40M several times in V3 boards.
Problem wrong number of turns on the filter coils.

Allison

Re: uBitx V3 low power continues

ajparent1/kb1gmx
 

If the problem is 20M only its either a filter issue or a relay issue for 20M only.

Not a lot of parts but I've seen the same complaint for 40M several times in V3 boards.
Problem wrong number of turns on the filter coils.

Allison

Re: uBitx V3 low power continues

ajparent1/kb1gmx
 


A Scope is nice if your understand what your looking at.

The easy way is the amp has an output line that goes to the
relays and filters.  break that line and measure power there.

There is nothing that dies prior to Q90 that is in the Power amp.

However there are two IF amps that can be all sorts of wrong
and the alignment of the oscillators as well.

However CW is generated differently than SSB and for CW TX
none  of the IF stages are used.

So the only things that can be broke is the 33mhz LPF alone
the edge or the power amp.

Allison

ajparent1/kb1gmx
 

The general answer no one has.

The amp mentioned is a considerable improvement but it was designed
for a trx that provides the needed 25 milliwatts drive.   The predriver and
driver in the ubitx is still needed and they have issues as well.  That and
grafting it to the ubitx would be a challenge for the non RF experienced.

No one I know of has done a single board replacement amp that
can do 10W from the output of the low pass filter.   Its a difficult
design to get that much gain on one board without VHF layout
the level of ground plane needed for stability.

Allison

Re: Downloading firmware

Mike WA0YCN
 

Mike,

I’m just about to start my build.  If you send an email with the instructions, would you mind copying me too please?

Thanks,

Mike
WA0YCN

Re: uBitx V3 low power continues

 

Hi Ted,

I hope you are recovering well from you surgery and infection.  That's tough breaks for sure.

I think from your former post, you said you have an oscilloscope?  If this was my board, I would start going through it using the 'scope.  For example, rather than just assuming the PA chain works OK because it gets warm, put the rig on 80m and follow the CW signal through.  Check the gain on each stage and make sure it all looks good that way.

For SSB, put a tone out of your cell phone (lots of aps for that) onto the mic and follow that signal.  You should be able to see the audio signal right at the mic and then see gain in each stage up to the mixer.  Then you should see the signal at RF and keep following it.

While not exactly the same rig, this site http://golddredgervideo.com/kc0wox/bitx20a.htm will show you how signals look as you follow them through the rig.  Signal tracing on the TX side is not too bad since the signals are all reletively large.

73,


Mark

Re: Downloading firmware

Mike Kilpatrick <mike.kilpatrick@...>
 

I know exactly how you feel!

When I first started with the ubitx earlier this year I was totally confused being a newbie to Arduino etc.

 

I would be happy to send you step by step details of how I managed to get mine up and running using CEC firmware.

 

We can do it here or you can email me at mike.kilpatrick@...

 

Mike

VK2DJP

 

 

 

M & J Kilpatrick
8 Chablis Drive
Cessnock
NSW 2325

Phone: +61 411 153 548

 

From: yrralguthri@...
Sent: Saturday, November 2, 2019 09:42
To: BITX20@groups.io
Subject: [BITX20] Downloading firmware

 

Are there files I can simply copy to a thumb drive and connect this thumb drive to the ubitx and allow it to update?

I'm not understanding the procedures I see on the ubitx sites on how to update the firmware.  I've just bought and wired a ubitx, it works, but I would like to update it to the KD8CEC firmware that works with the standard two-line display.  

 

Downloading firmware

yrralguthri@...
 

Are there files I can simply copy to a thumb drive and connect this thumb drive to the ubitx and allow it to update?

I'm not understanding the procedures I see on the ubitx sites on how to update the firmware.  I've just bought and wired a ubitx, it works, but I would like to update it to the KD8CEC firmware that works with the standard two-line display.  

Curt
 

The PC board layout is a bit sensitive to HF signals. Why not purchase the similar PA from qrp-labs, certainly less expensive than doing your own board. Also Hans and Allison did lots of work to improve its performance.

Curt

Woody
 

On 11/1/2019 19:12, circular.simetry@... wrote:
Hello everybody, i have build a homebrew ubitx and i am working now on the LPF the original uses T30-6 toroids i have available only T37-6 does anybody know how many turns i have to wind?

This might help...  Go to   https://toroids.info/
Enter  T30-6 toroid and the number of turns
Get the inductance
Enter T37-6 toroid and the inductance
Get the number of turns.
Caveat - Due to the difference in core sizes, it might not be possible to obtain an exact inductance match.

Woody, KZ4AK
KZ4AK.com
--

 

Using the Schem for the uBitx you can convert nano Henry to uH using a converter (found on google) and then using the calculator on this link from Diz at kitsandparts http://toroids.info/T37-6.php the 1st stage for example at KA1 is 400nH=.40uH is 11.5 turns (11 or 12 will work).

 Hope this helps.

 73
--
David

 N8DAH
Kit-Projects.com

Shop is open!

 

If you use this calculator, http://toroids.info/T37-6.php to compare the two toroids, it shows the T37-6 to be about one turn more than the T30-6.

Joel
N6ALT

circular.simetry@...
 

Does anybody have the pcb layout for standalone PA and LPF of the ubitx ? Thanks în advance.

circular.simetry@...
 

Hello everybody, i have build a homebrew ubitx and i am working now on the LPF the original uses T30-6 toroids i have available only T37-6 does anybody know how many turns i have to wind?

Re: Project to adapt ubitx for the visually challenged

Vic WA4THR
 

Back in 2018 Andy, KB1OIQ, did a lot of work on such a project and there is information on the ubitx.net website:
http://ubitx.net/2018/03/08/kb1oiq-firmware-and-hardware-mods-to-bitx40-and-ubitx/

=Vic=

Re: uBitx V3 low power continues

MVS Sarma
 

Ted,
as and when time permits  take a photo of the Post PA  LPF sections. you would locate the LPF covering 40m band.
 check the turns of coils L17, L18 and l19.
Cross check with ft37-43 core on site calculator   at kits and parts. you will find that it  might be having additional turns.
   we can remove coils from top itself   no need to pull board out. try to tweak the coils by reducing and measuring, if possible.
 The power on 40m would come up.
secondly,
 perhaps one could try increasing the  local VFO , intermediate and BFO osc levels. by manipulating the code in si5351 firmware.
 they are set at 2mA by defining 1, 1, 1  for clocks 0, 1 and 2
we can perhaps try with 2, 2, 2 instead.

 notice that on v5 the designer had made it 3, 3, 3

 we can always restore them to old levels by a click of button on arduino ide.

all the best for a speedy recovery from spinal issues.

 sarma vu3zmv



On Thu, Oct 31, 2019 at 12:13 AM Ted via Groups.Io <k3rta=yahoo.com@groups.io> wrote:
This is a follow-up to another thread that is months old. I'm now recovering from cervical spine surgery & attendant complications of infection, so I've had time to repeat tests though not necessarily any clearer mind. Having only 15-20 degrees of rotation of my neck isn't helping, either, with bench work.

To review: a perfectly-functioning radio with typical RF out levels (12w out in 80, 10w in 40, 8w on 20, etc) has devolved to less than a watt on CW on all bands and even less on SSB. The exception is 20 meters, where a couple of watts in CW show up.

Let us assume the finals are fine and that all drivers and pre-drivers are OK. They all get warm, in fact. Suggestions were made to trace the RF thru the LPF array to ensure power wasn't being eaten by a stuck relay or bad filter. I think that this possibility has been eliminated, though I can't explain why the finals get warm and yet the output generally stinks AND worse on one mode than on another.

Again, the SSB signal is far below the CW/dead carrier level, perhaps it is 25-30% of carrier level (according to my oscillscope).  Output at the antenna connection shows approximately the same level as measured at the final transistors.

What dies, prior to Q90, that kills SSB and CW as described?   My sledge hammer works just fine and requires little skill to operate - and at this point makes a better communication tool than my uBitx. I'm not allowed to pick up 15 lbs, though, so that option is on standby. I just don't get it. 


Thanks,

Ted   K3RTA

Re: Project to adapt ubitx for the visually challenged

Buddy Brannan
 

Howdy,

I’m another blind op and longtime lurker. I’ve chatted with a couple different folks about this (Hi Jim), but I’ve not really had a lot of time to pursue it or, for that matter, many other ham radio pursuits of late. I’d be really pleased with a morse readout myself, but there have been discussions around voice synthesis with keypads as an offshoot of sorts to some of the add-on designs that have been done with touch screens. Those discussions were months ago for me, and, sadly, I haven’t had time to pursue, and I haven’t bought a kit with which to pursue these things either, although I’ve gotten at least one offer of assistance when that time comes to pick it up.

Given that a lot of blind people are on fixed (read low) incomes and the UBitx is a really neat low-cost solution, I’m sure there would be interest beyond myself and this other fella.

Vy 73,


Buddy Brannan, KB5ELV - Erie, PA
Email: buddy@...
Mobile: (814) 431-0962

On Oct 31, 2019, at 11:39 PM, Ashhar Farhan <farhanbox@...> wrote:

I have been in touch with someone who is a potential ubitx user. He needs a cw read out of the frequency, etc. It should be an easy one to add. I am pasting his email below. It came toy other email inbox.
Are there any volunteers for this?

Hello Ashhar Farhan:

Thank you for the nice reply.

It has taken me some time in putting this response together. Much sol
full and creative thought has gone in to the response. The below
should get the U-Bit-X community thought processes started. Please
pass this on to the U-Bit-X community. Not sure when I will join the
group.

My plans are to obtain an U-Bit-X rig and join the user group. I
wonder if a functioning, already built used U-Bit-X rig might be a
good first starter. May be someone in the community might know of one
to be purchase. Sorry for any delay.

As a person who is blind, many product videos are not much benefit to
me. This is due to these videos want the viewer to read the product
screen when prompts and information are displayed. This is their
normal demonstration means rather than showing and reading the display
at the same time.

If the products being demonstrated would talked like an Apple
I/Pad/Phone/Pod/ with Voice Over turned on, then the product would be
self explaining. This gives me a creative wondering could the U-Bit-X
be control by an Apple I/Product? This would be via a direct cable
connection. Between both devices.

The following are my thoughts on the U-Bit-X CW Speaking of the
Display. It starts with propose new menu choices. Within each new menu
choice, it should describe the needed ability. See my comments at the
end.

Add the following new menu features:

Turn On Auto CW speaking Of The Display.
When this feature is turned on:
After the tuning knob stopped being turned and a delay of CW seconds
times out,
the menu feature or frequency is read via CW.

CW seconds time out value
This is a menu choice where you specify the time out value for the
Auto CW reading.
Example: 0.25, 0.50, 0.75, 1.00, 1.25, 1.50, 1.75 seconds.
Suggest the default of 0.75 seconds

Turn On Manual CW reading Of The Display.
When this feature is turned on:
Single tap of the tuning knob
the menu feature or frequency is read via CW.
Note, when this feature is turned on:
Double tap of the tuning knob will bring up the menus or other features.

Double Tap Value
Some individuals may need a longer spacing for double tapping. I have
right hand trauma from being a back seat passenger in an auto
accident. The trauma was to my right hand which I use for reading
Braille and sending CW. I have no recommended starting value.

Tuning Clicks
When this feature is turned on:
As you turn the tuning knob up or down in frequency,
single audible click for every one KHZ,
double audible click for every 10 KHZ, and
triple audible click for every 50 KHZ is heard.
With menus, a click for every menu choice stopped on or pass over.
If the user knows the starting point via CW reading, they can keep
track by counting the clicks.

CW Flushing
When this feature is turned on:
While the menu information or frequency being read,
tap the tuning knob, pushing the microphone button or pressing the CW
key will stop the CW reading. When pressing the microphone button or
using the CW key will flush CW reading and begin transmitting.
With this feature turned off:
all voice transmitting and CW sending is disabled until CW reading is
completed.
When off, CW reading is only stopped when going between menu and frequency.

Receiver mute
When this feature is turned on:
The receiver audio is muted when CW reading is occurring.
When this feature is turned off:
The receiver volume is cut in half while CW reading is occurring.

CW Speed
This is where you set the CW speed for the menu or frequency to be read.

CW Spacing
This is where you specify any additional spacing between CW characters
to be read. This is for persons who like their CW characters sent at a
fast speed like 15 words per minute. But, character spacing delay
increase for a total reading speed of 7 words per minute.

CW Character Volume
This is where you set the volume for CW reading.

CW Tone
This is where you set the frequency tone for CW reading.

Comments:

It is so easy to provide just frequency read out via CW. Blind fold
yourself and try to eat a meal, run a vacuum sweeper, wash walls, use
a microwave oven, cook on the stove, use a cell phone, use a computer,
use all abilities of the U-Bit-X, Etc.

To make full use of the U-Bit-X for person who are blind, all display
abilities need to be outputted via some form of CW reading.
Abbreviated words might work in some situations. Examples, RX -
receiver, TX - transmitter, V A - vfo A, V B - VFO B, A VOX - anti
vox, G VOX - vox gaine, D VOX - vox delay, S VOX - vox sensativity,
ETC.

For those of you who are writing the CW reading code, make sure to
blindfold yourself when testing out this new feature. Then I look
forward to the results of your effort.

I can be reached at this <wd8ajq@...> email address.
Also, I am on Echo Link.
73 Dave WD8AJQ

Project to adapt ubitx for the visually challenged

Ashhar Farhan
 

I have been in touch with someone who is a potential ubitx user. He needs a cw read out of the frequency, etc. It should be an easy one to add. I am pasting his email below. It came toy other email inbox.
Are there any volunteers for this?

Hello Ashhar Farhan:

Thank you for the nice reply.

It has taken me some time in putting this response together. Much sol
full and creative thought has gone in to the response. The below
should get the U-Bit-X community thought processes started. Please
pass this on to the U-Bit-X community. Not sure when I will join the
group.

My plans are to obtain an U-Bit-X rig and join the user group. I
wonder if a  functioning, already built used U-Bit-X rig might be a
good first starter. May be someone in the community might know of one
to be purchase. Sorry for any delay.

As a person who is blind, many product videos are not much benefit to
me. This is due to these videos  want the viewer to read the product
screen when prompts and information are displayed. This is their
normal demonstration means rather than showing and reading the display
at the same time.

If the products being demonstrated would talked like an Apple
I/Pad/Phone/Pod/ with Voice Over turned on, then the product would be
self explaining.  This gives me a creative wondering could the U-Bit-X
be control by an Apple I/Product? This would be  via a direct cable
connection.  Between both devices.

The following are my thoughts on the U-Bit-X CW Speaking of the
Display. It starts with propose new menu choices. Within each new menu
choice, it should describe the needed ability. See my comments at the
end.

Add the following new menu features:

Turn On Auto CW speaking Of The Display.
When this feature is turned on:
After the tuning knob stopped being turned and a delay of CW  seconds
times out,
the menu feature or frequency is read via CW.

CW  seconds time out value
This is a menu choice where you specify the time out value for the
Auto CW reading.
Example: 0.25, 0.50, 0.75, 1.00, 1.25, 1.50, 1.75 seconds.
Suggest the default of 0.75 seconds

Turn On Manual CW reading Of The Display.
When this feature is turned on:
Single tap of the tuning knob
the menu feature or frequency is read via CW.
Note, when this feature is turned on:
 Double tap of the tuning knob will bring up the menus or other features.

Double Tap Value
Some individuals may need a longer spacing for double tapping. I have
right hand trauma from being a back seat passenger in an auto
accident. The trauma was to my right hand which I use for reading
Braille and sending CW. I have no recommended starting value.

Tuning Clicks
When this feature is turned on:
As you turn the tuning knob up or down in frequency,
single audible click for every one KHZ,
double audible click for every 10 KHZ, and
triple audible click for every 50 KHZ is heard.
With menus, a click for every menu choice stopped  on or pass over.
If the user knows the starting point via CW reading, they can keep
track by counting the clicks.

CW Flushing
When this feature is turned on:
While the menu information or frequency being read,
tap the tuning knob, pushing the microphone button or pressing the CW
key will stop the CW reading. When pressing the microphone button or
using the CW key will flush CW reading  and begin transmitting.
With this feature turned off:
 all voice transmitting and CW sending is disabled until CW reading is
completed.
When off, CW reading is only stopped when going between menu and frequency.

Receiver mute
When this feature is turned on:
The receiver audio is muted when CW reading is occurring.
When this feature is turned off:
The receiver volume is cut in half while CW reading is occurring.

CW Speed
This is where you set the CW speed for the menu or frequency to be read.

CW Spacing
This is where you specify any additional spacing between CW characters
to be read. This is for persons who like their CW characters sent at a
fast speed like 15 words per minute. But, character  spacing delay
increase for a total reading speed of 7 words per minute.

CW Character Volume
This is where you set the volume for CW reading.

CW Tone
This is where you set the frequency tone for CW reading.

Comments:

It is so easy to provide just frequency read out via CW. Blind fold
yourself and try to eat a meal, run a vacuum sweeper, wash walls, use
a microwave oven, cook on the stove, use a cell phone, use a computer,
use all abilities of the U-Bit-X,  Etc.

To make full use of the U-Bit-X for person who are blind, all display
abilities need to be outputted via some form of CW reading.
Abbreviated words might work in some situations. Examples, RX -
receiver, TX - transmitter, V A - vfo A, V B - VFO B, A VOX - anti
vox, G VOX - vox gaine, D VOX - vox delay, S VOX - vox sensativity,
ETC.

For those of you who are writing the CW reading code, make sure to
blindfold yourself when testing out this new feature. Then I look
forward to the results of your effort.

I can be reached at this <wd8ajq@...> email address.
Also, I am on Echo Link.
73 Dave WD8AJQ