Date   
Ubitx version 4.3

p.gould1@...
 

Hi all.
Just received and built the latest ubitx, and have encountered a couple of seeming problems.
It is all wired up according to specification.
First problem is that there is little or no audio on rx , and the sidetone volume is fine
Secondly that when using straight key the first key down isn't recognised, there is a pause then a dash before it catches up with what is being sent,
Resulting in corrupt call signs etc. it's ok then as long as I don't pause in sending!
And hopefully and lastly the bandwidth of the received stations are enormous so if trying to contact them , where to put the frequency is a matter of guess work.
Hope this makes sense, and the answer is simple enough for my grey cells to contemplate.
Best regards
Paul......M6FEU

Re: Ubitx version 4.3

Jerry Gaffke
 

Enormous bandwidth?
Are you using this rig mostly for CW?
It is primarily designed for SSB use, CW is an afterthought.
The crystal filter is around 2khz wide, as required for SSB use.
The easiest solution for CW would be to add an external filter between headphone jack and headphones.

There are updates to the the firmware should solve the keying issue for you, check out the KD8CEC firmware.


On Mon, Jul 16, 2018 at 08:22 AM, p.gould1@... wrote:
Hi all.
Just received and built the latest ubitx, and have encountered a couple of seeming problems.
It is all wired up according to specification.
First problem is that there is little or no audio on rx , and the sidetone volume is fine
Secondly that when using straight key the first key down isn't recognised, there is a pause then a dash before it catches up with what is being sent,
Resulting in corrupt call signs etc. it's ok then as long as I don't pause in sending!
And hopefully and lastly the bandwidth of the received stations are enormous so if trying to contact them , where to put the frequency is a matter of guess work.
Hope this makes sense, and the answer is simple enough for my grey cells to contemplate.
Best regards
Paul......M6FEU

Re: receive works great, but no trans power, #ubitx-help

Bo Barry <wn4ghv@...>
 

Please post the link to the guide again. Tnx Bo W4GHV 

Re: Q70 replacement

Kevin Rea
 

Here on eBay.
https://www.ebay.com/itm/100-x-2SC945-C945-BIPOLAR-TRANSISTORS-NPN-TO-92-50V-USA-SELLER-Free-Shipping/323210926653?epid=1113025015&hash=item4b40df5a3d%3Ag%3A6MkAAOSwBahVT88a&LH_PrefLoc=1&_nkw=2SC945&_from=R40&rt=nc

Re: uBitX for sale

Ryan Benteman AD0TZ
 

Sold.  

Re: BITX QSO Afternoon/Evening, Sunday, July 15, 3PM & 7PM Local Time, 7277 kHz in North America, 7177 kHz elsewhere.

James Lynes
 

Heard N2CQR calling CQ once around 7:32 EDT here in WCF. Then faded into the ether...

James
KE4MIQ

Re: receive works great, but no trans power, #ubitx-help

Jerry Gaffke
 

I certainly wouldn't dump it.
Could sell it on the forum here.
Could state your location in the forum, see if others live close.
Could haul it into a local ham club meeting, see if anybody is 
interested in helping you debug it.
Could park it on the shelf for a week or two, then take another look.

Could be as simple as a bad connection at the antenna BNC connector.
The BNC socket provided with the kit is not machined to tight enough tolerances,
in many cases the middle pin does not make contact.
That was a problem with my uBitx, and others here have reported the same issue.
Try adding wires to go around that BNC connector directly to your dummy load.

Another common point of failure is the torroid transformers, inspect them closely.
Could be that the enamel wasn't scraped off the wire somewhere, and so the solder joint isn't working.
Or a broken wire, they are kind of heavy so rough handling while shipping can break them.
Following the schematic, check with an ohmmeter.

##############
We should have a standard procedure for checkout out the transmitter.
Something like this:

Build a specific version of the diode RF probe, driving A7 for voltage readings to the LCD.
Create special Raduino firmware to support the debug procedure.

Set up the rig to transmit CW at 7mhz, disconnect PA-PWR to the IRF510's so they don't burn up.
Verify DC and AC levels using DVM and the RF probe at all points through T2, Q90, Q911, Q912, Q92,93,96,97.
Compare your readings with a chart for a properly functioning rig.

Apply PA-PWR, add a dummy load, measure power at IRF510 drains and at the dummy load.

Drive mike input from sidetone, go to special code that puts rig in SSB transmit mode with sidetone operating.
Verify DC and AC levels through Q6, D6, Q40,41,42, Q20,21,22
(The remainder of the transmitter was already checked out in CW mode.)

Something similar could be done for the receiver.
Perhaps generate 7mhz on CLK0 (normally the BFO) and apply that through an attenuator to the antenna port.
Trace this using the RF probe all the way through the 45mhz and 12mhz crystal filters to D5.
Now restore the BFO to 12mhz, disconnect it from the antenna, and unbalance the first mixer using CW-KEY.
Inject 45mhz at CLK2, and verify the product detector and audio chain.
Again, we need to compile a list of expected DC and AC voltages at each stage.

Parts for a good 12W dummy load (parallel four of Mouser part number 283-200-RC) 
plus a diode RF probe (1n5711 or similar, a couple caps and resistors) plus appropriate attenuators (a few resistors)
would cost about $1.  Could be included with every kit.

This capacitance meter using a Nano might also be of interest:
    https://groups.io/g/BITX20/message/52471

Am curious if anybody has a good way to measure inductance using the Nano.
I'd probably measure a 100pf cap using the above capacitance meter, then sweep a parallel combination
of the inductor being tested plus the 100pf cap using an output from the si5351 through a series resistor.
Look for the lowest freq dip using the RF probe.  Other caps such as 10pf, 1nf, ... might also be of use
depending on the size of the inductor.
The si5351 can go from about 4khz to 200mhz, up to 290mhz if pressed.

Jerry, KE7ER


On Mon, Jul 16, 2018 at 07:59 AM, Don - KM4UDX wrote:
Clark & Jerry -- thank you for the guidance! 

I think I'm getting in over my head here. I'll try some more basic debugging, but if I can't figure it out, I may have to put it in the dump and call it a "lesions learned" experience.

The ratio of working/communicating is getting way too high. I'm sadden that so many other uBitx folks are working the world, but I can't get out of my workbench. sigh. 

Re: Question about Nextion display and firmware

Bo Barry <wn4ghv@...>
 

Mike, I think he wanted a hex file compiled on a mega2560 not nano.
  I was going to do that and give him the link to the uploader program. Bo W4GHV 

Re: receive works great, but no trans power, #ubitx-help

Gordon Gibby
 

If the ham radio operator has another receiver,  they can use it to listen for signal at earlier stages.  

CW would allow them to know exactly what frequency to listen for on earlier stages.  

The way you eat an elephant is one stage at a time.   




On Jul 16, 2018, at 12:50, Jerry Gaffke via Groups.Io <jgaffke@...> wrote:

I certainly wouldn't dump it.
Could sell it on the forum here.
Could state your location in the forum, see if others live close.
Could haul it into a local ham club meeting, see if anybody is 
interested in helping you debug it.
Could park it on the shelf for a week or two, then take another look.

Could be as simple as a bad connection at the antenna BNC connector.
The BNC socket provided with the kit is not machined to tight enough tolerances,
in many cases the middle pin does not make contact.
That was a problem with my uBitx, and others here have reported the same issue.
Try adding wires to go around that BNC connector directly to your dummy load.

Another common point of failure is the torroid transformers, inspect them closely.
Could be that the enamel wasn't scraped off the wire somewhere, and so the solder joint isn't working.
Or a broken wire, they are kind of heavy so rough handling while shipping can break them.
Following the schematic, check with an ohmmeter.

##############
We should have a standard procedure for checkout out the transmitter.
Something like this:

Build a specific version of the diode RF probe, driving A7 for voltage readings to the LCD.
Create special Raduino firmware to support the debug procedure.

Set up the rig to transmit CW at 7mhz, disconnect PA-PWR to the IRF510's so they don't burn up.
Verify DC and AC levels using DVM and the RF probe at all points through T2, Q90, Q911, Q912, Q92,93,96,97.
Compare your readings with a chart for a properly functioning rig.

Apply PA-PWR, add a dummy load, measure power at IRF510 drains and at the dummy load.

Drive mike input from sidetone, go to special code that puts rig in SSB transmit mode with sidetone operating.
Verify DC and AC levels through Q6, D6, Q40,41,42, Q20,21,22
(The remainder of the transmitter was already checked out in CW mode.)

Something similar could be done for the receiver.
Perhaps generate 7mhz on CLK0 (normally the BFO) and apply that through an attenuator to the antenna port.
Trace this using the RF probe all the way through the 45mhz and 12mhz crystal filters to D5.
Now restore the BFO to 12mhz, disconnect it from the antenna, and unbalance the first mixer using CW-KEY.
Inject 45mhz at CLK2, and verify the product detector and audio chain.
Again, we need to compile a list of expected DC and AC voltages at each stage.

Parts for a good 12W dummy load (parallel four of Mouser part number 283-200-RC) 
plus a diode RF probe (1n5711 or similar, a couple caps and resistors) plus appropriate attenuators (a few resistors)
would cost about $1.  Could be included with every kit.

This capacitance meter using a Nano might also be of interest:
    https://groups.io/g/BITX20/message/52471

Am curious if anybody has a good way to measure inductance using the Nano.
I'd probably measure a 100pf cap using the above capacitance meter, then sweep a parallel combination
of the inductor being tested plus the 100pf cap using an output from the si5351 through a series resistor.
Look for the lowest freq dip using the RF probe.  Other caps such as 10pf, 1nf, ... might also be of use
depending on the size of the inductor.
The si5351 can go from about 4khz to 200mhz, up to 290mhz if pressed.

Jerry, KE7ER


On Mon, Jul 16, 2018 at 07:59 AM, Don - KM4UDX wrote:
Clark & Jerry -- thank you for the guidance! 

I think I'm getting in over my head here. I'll try some more basic debugging, but if I can't figure it out, I may have to put it in the dump and call it a "lesions learned" experience.

The ratio of working/communicating is getting way too high. I'm sadden that so many other uBitx folks are working the world, but I can't get out of my workbench. sigh. 

Re: #bitx40help #radiuno #bitx40help #radiuno

m5fra2@...
 

Mine came in in about 8 days Ray using India post.

 

Colin – M5FRA

 

From: BITX20@groups.io <BITX20@groups.io> On Behalf Of raymond bisseker
Sent: 16 July 2018 15:29
To: BITX20@groups.io
Subject: Re: [BITX20] #bitx40help #radiuno

 

Read all the posts with interest..Just waiting for my uBITX to arrive....Thanks Guys....Ray G3SRQ/F5VKX


Virus-free. www.avast.com

Re: #bitx40help #radiuno #bitx40help #radiuno

raymond bisseker <g3srq@...>
 

Hi Colin, Thanks for info...Mine is now in Paris, should get it this week:-)


From: BITX20@groups.io <BITX20@groups.io> on behalf of m5fra2 via Groups.Io <m5fra2@...>
Sent: Monday, July 16, 2018 7:02:28 PM
To: BITX20@groups.io
Subject: Re: [BITX20] #bitx40help #radiuno
 

Mine came in in about 8 days Ray using India post.

 

Colin – M5FRA

 

From: BITX20@groups.io <BITX20@groups.io> On Behalf Of raymond bisseker
Sent: 16 July 2018 15:29
To: BITX20@groups.io
Subject: Re: [BITX20] #bitx40help #radiuno

 

Read all the posts with interest..Just waiting for my uBITX to arrive....Thanks Guys....Ray G3SRQ/F5VKX


Virus-free. www.avast.com

bitx 40 low mike gain

Elmar Völler <dl2qa@...>
 

Hello,
I had the same problems  like many other hams and found a simple solution.
The complete cuircuit fits in any small micro and boost the level very comfortable.
Of course it is usable for any other trx as well.
(See the following scetch)
73s, elmar--dl2qa.
 

Re: receive works great, but no trans power, #ubitx-help

Don - KM4UDX
 

here is the link to the troubleshooting guide....it is a great document...and thanks to Ufi Auttorri, wherever you are!

https://groups.io/g/BITX20/attachment/52578/0/uBitxTroubleshooting%20manuala.pdf

Re: HDMI display

ajparent1/KB1GMX
 

Doing HDMI from a Arduino is difficult and impractical.  Rpi and some of the other 32bit CPUs
can but then you need software for them.  The Rpi (I have used them all) can run linux and
many rig control packages could be installed. 

Or....  Get a cheap Android tablet as most have USB output (USB-OTG) and load up a rig
control package on that.  Its self contained can be had cheap in typically 7 and 10 inch
sizes has a touch screen for IO.  

Since the Raduino with recent software does support CAT interface that can work easily
(little electronics) some software required.

Allison

Re: VE1BWV audio pop fix - lost my sidetone

G8HAV
 

Hi All,
Had my uBitz for a couple of months and been reading the mail as I have checked it out and made various modifications on the way. Thought i had destroyed it while testing a LM386 amp, but put it back to original TDA amp and all is orking.
Pleasantly surprised a couple of evening ago I had a power meter in line with a dummy load connected and heard bot CW and voice on 40M. Only 8" of coax from radio to meter. Sensitivity seems up to the mark. Getting the uneven power across the bands but with 13.8 V I get some 12 W on 80 and 40 but the usual 3W on 10M.
However I built VE1BWV anti-pop circuit and it works great, but no sidetone. Tried the .1uF in series with R253 but there is a faint sidetone with vol turned up.. I am going to remove it and get the sidetone back and maybe try a different suggestion. Got the Iambic keying working and I am using Ian's ver 1.08 without any problems. Next on the list is calibration although I am zero beating at 10 MHz to GPS locked oscillator. Need to check the BFO for LSB and USB as well.
When I get these going the next is balancing up the power across the bands and then a touch display. A highly functional transceiver where the hardware and firmware are all in the operators control. Still loads to modify and add. Fantastic conception and then there is M0HYT non SMD version, but I cannot find anyway to bring up the printed circuit layers. Much to go on with never mind diving into the code. 

First impressions #ubitx

Mike KK7ER
 

My son and I finished wiring our uBITX v3 (ordered the day before v4 came out) over the weekend.
We powered on and checked out the receiver functions right in the middle of a big contest and 20m was really busy!
My son was thrilled -- we heard stations from TX, OR, CA, and HI in the US as well as Venezuela using an end-fed wire.
A few observations:
1.  The need for AGC was very clear and we already have the ND6T kit so that's modification #2 (after CEC FW upgrade).
2.  The max audio level is pretty low.  Reading the group, it is not clear if there is a consensus on a fix for that but I noticed the Q70 recent replacement thread.
3.  Audio quality is not great. It is hard to describe precisely but speech is distorted and noise has an impulsive character to it.  My frame of reference is a Kenwood TS-130S.
4.  Audio bandwidth is too wide for CW.  A filter would really help.  Again, I'm not finding a consensus solution.
5.  WWV at 10MHz is tuning for us at 9.9985Mhz (1.5KHz too low).
6. Some components are fragile and easily damaged (encoder switch failed during installation, BNC connector insulation melted while soldering antenna wire, etc.)

We're really looking forward to using and modifying this rig.

73 Mike KK7ER

Re: New file uploaded to BITX20@groups.io

Michel Dupuy
 

Thanks Allen,
Yes I configured the S / Meter with Memory Manager and it worked correctly with the Nextion 2.8 and was up to + 20 dB while with Nextion 3.5 he does not want to exceed the S9. I do not think it's very serious. thank you very much
Michel F1GTX

Re: error in memory manager

Mike KK7ER
 

Thanks, Mike!  That really clears it up.

73 Mike KK7ER

3.2in Nextion display now looks great.

Malcolm
 

Many thanks to Ian KD8CEC and Allen Merrill for their great work and time in producing superb operating software and display for the ubitx transceiver , very much appreciated. 
Malcolm EI8FH 

Re: 3.2in Nextion display now looks great.

Kevin Rea
 

Hi Malcolm,
what case did you use for your ubitx ?
Kevin Rea
K6REA