Date   
Re: Ubitx V^ just assembled, VFO Doesnt Work, no receive/audio

stefan@...
 

OK, new updates! , I replaced the headphone jack, speaker is now working! I recalibrated to 1.055 and can now tune SSB without it being all garbled, still have some fine tuning to do, but I'm very close. I tried xmitting into a 100w Dummy load right next to my SDR receiver with no antenna attached, nothing showing up on the waterfall. I will try the reverse beacon network later today and see if anyones hearing me. Thanks again guys, I'll let you know if the TX works ands I'm off to the races. 

Re: Sensitive Mike cord

Arv Evans
 

KJ6VGB

Way back in the early BITX20 days some of us found that curly cords have inductance
and were acting as antennas.  RF was present in the J-FET amplifier inside our electret
microphones.  The fix was to add a 0.001 mfd capacitor across the microphone capsule
connections. 

Arv  K7HKL
_._


On Sat, Feb 1, 2020 at 11:59 PM Maurice Bersan via Groups.Io <Vk6hly=yahoo.com@groups.io> wrote:
Thanks Dennis, I did try 2 snap on ferrites at various locations and did not make any difference at all. I find the curly cord is most sensitive at the Mike end. 
I just made up a new Mike cord using straight cord not the curly type and it seems to have cured the problem, or at least vastly improved it.
Maurice


On Thu, Jan 30, 2020 at 7:28 AM, Dennis Beverage
<Sodypop@...> wrote:

Maurice,  

you probably have spurious rf carrier on your antenna feed line coming into your radio antenna hookup.  Try putting two or three snap on ferrites on the antenna lead near the radio.  You could also be generating similar signals in the shielded cable lead you said you used on the radio side of the antenna connector.  Try the same solution there.  Also, try touching those antenna leads in both locations to see if there are any changes similar to the ones your having on the mic cable.  It would seem likely there is RF floating around somewhere in proximity to your mic hook up.
--
Sodypop🤠

KJ6VGB

Re: Made Mods to V3 uBitx - no longer transmitting #ubitx-help #v3

Lawrence Galea
 

Hi
if you want to save your pcb from several relay changes once you take them off use 16 pin turned pins IC sockets.
The relays plug in perfectly in them.
At least the relays I have from a local source which are very similar and of the same size as those used in the μBITX.
If you do not want to drill the PCB for the extra pins you can snap them off.
Saves your PCB 
Maybe will be used in future μBITX's?
Regards
Lawrence



On Fri, Jan 31, 2020 at 8:45 PM Michael Shreeve <shreevester@...> wrote:
And, also, if I were to build the same rf probe you decide to build, then, since I have an un-modified rv3 I can measure some of these rf voltages. We could compare what we see.

Re: BitX40's For Sale

Jim WB2LHP in MI
 

Hi Georg...I just sold you one of these last month...It's 40 meters only...The uBitX series all the all banders...73 Jim WB2LHP

On Sun, Feb 2, 2020 at 1:21 AM George P Linehan III via Groups.Io <linehangp=icloud.com@groups.io> wrote:
Hi I’m a newbie although licensed since 1973 .. are these the all band rigs .. if so I’ll buy one Wa6YCA

On Feb 1, 2020, at 9:39 PM, Jim WB2LHP in MI <jmarco1955@...> wrote:

Two identical BitX40's as I received them...Both have Spectrol 10-turn tuning pot, function button, USB mod and fixed audio output for Data modes...Both are beautifully hand wired and come with Allard's v1.29 firmware...Asking $125 each shipped...CONUS only...PayPal preferred...Thanks for looking...Jim WB2LHP
<IMG_0004.JPG>

Re: Sensitive Mike cord

Lawrence Galea
 

Is the cable screened?
Try decoupling capacitors from all leads to ground
Regards
Lawrence

On Sun, Feb 2, 2020 at 7:59 AM Maurice Bersan via Groups.Io <Vk6hly=yahoo.com@groups.io> wrote:
Thanks Dennis, I did try 2 snap on ferrites at various locations and did not make any difference at all. I find the curly cord is most sensitive at the Mike end. 
I just made up a new Mike cord using straight cord not the curly type and it seems to have cured the problem, or at least vastly improved it.
Maurice


On Thu, Jan 30, 2020 at 7:28 AM, Dennis Beverage
<Sodypop@...> wrote:

Maurice,  

you probably have spurious rf carrier on your antenna feed line coming into your radio antenna hookup.  Try putting two or three snap on ferrites on the antenna lead near the radio.  You could also be generating similar signals in the shielded cable lead you said you used on the radio side of the antenna connector.  Try the same solution there.  Also, try touching those antenna leads in both locations to see if there are any changes similar to the ones your having on the mic cable.  It would seem likely there is RF floating around somewhere in proximity to your mic hook up.
--
Sodypop🤠

KJ6VGB

Re: Sensitive Mike cord

Maurice Bersan
 

Thanks Dennis, I did try 2 snap on ferrites at various locations and did not make any difference at all. I find the curly cord is most sensitive at the Mike end. 
I just made up a new Mike cord using straight cord not the curly type and it seems to have cured the problem, or at least vastly improved it.
Maurice


On Thu, Jan 30, 2020 at 7:28 AM, Dennis Beverage
<Sodypop@...> wrote:

Maurice,  

you probably have spurious rf carrier on your antenna feed line coming into your radio antenna hookup.  Try putting two or three snap on ferrites on the antenna lead near the radio.  You could also be generating similar signals in the shielded cable lead you said you used on the radio side of the antenna connector.  Try the same solution there.  Also, try touching those antenna leads in both locations to see if there are any changes similar to the ones your having on the mic cable.  It would seem likely there is RF floating around somewhere in proximity to your mic hook up.
--
Sodypop🤠

KJ6VGB

Re: BitX40's For Sale

George P Linehan III
 

Hi I’m a newbie although licensed since 1973 .. are these the all band rigs .. if so I’ll buy one Wa6YCA

On Feb 1, 2020, at 9:39 PM, Jim WB2LHP in MI <jmarco1955@...> wrote:

Two identical BitX40's as I received them...Both have Spectrol 10-turn tuning pot, function button, USB mod and fixed audio output for Data modes...Both are beautifully hand wired and come with Allard's v1.29 firmware...Asking $125 each shipped...CONUS only...PayPal preferred...Thanks for looking...Jim WB2LHP
<IMG_0004.JPG>

Re: C210 & C216 Missing from main board. Should they be? #ubitx #v6

Jerry Gaffke
 

These caps have been removed since the first uBitx ever shipped, which was the v3 board.


On Sat, Feb 1, 2020 at 07:28 PM, MVS Sarma wrote:
Since ver5 , these capa itors have been removed from design, making 0 value foe them. 
As such v6 also doesn't have thes caps. 
 
Sarma vu3zmv

Re: C210 & C216 Missing from main board. Should they be? #ubitx #v6

MVS Sarma
 

Since ver5 , these capa itors have been removed from design, making 0 value foe them. 
As such v6 also doesn't have thes caps. 

Sarma vu3zmv

On Sun, 2 Feb 2020, 5:59 am Curt via Groups.Io, <wb8yyy=yahoo.com@groups.io> wrote:
Jim

I don't know which version you have, but my v4 40m CW output dips on 40m, as best I can tell due to circuit interaction.  I have reduced it just a little by installing SMT inductors at the 45 MHz filter.  I have finally decided that its 'okay' as with this behavior as I can still make some QSOs.  If I get this 50w amplifier from QRP labs built it won't matter.  You may find your 40m SSB output is stronger because its a different circuit configuration.  oh yes if you must, try touching the inductors L5 and L7 - you may see a power increase when operating CW (not that this solution is practical). 

73 Curt

Re: Ubitx V^ just assembled, VFO Doesnt Work, no receive/audio

Ashhar Farhan
 

Correction!
This you shouldn't have to tune below 11 mhz. This is way, way off the bfo. The bfo should be more likely 11.055 mhz. 
As I have said often before, you should never touch the calibration as the boards come from the factory. Once the frequencies are off so much, you won't have a good starting point at all.
I would suggest that you dial back the bfo to 11.055 mhz and start over again.
- f

On Sun 2 Feb, 2020, 4:55 AM Michael Shreeve, <shreevester@...> wrote:
At one time  v3 era, I started a YouTube channel,  and did a complete construction playlist for uBITX at CaliforniaKayaker N6GRG channel . Not sure additional info is available for the V6. Definitely somewhat different animal,  but it has a lot of similar content.  I'll research and add to it. 

On Sat, Feb 1, 2020, 2:43 PM <n4gix@...> wrote:
I just wanted to let your "mistake" saved my bacon, as I too plugged the encoder into the main board rather than on the top of the raduino. I was also unsure of where the speaker was to plug in.

I have to ask, "what directions?" as all I received was an illustrated parts list, which while helpful, wasn't much help otherwise.

If it hadn't been for your question and the extremely helpful answers posted in this thread, I'd still be scratching my head. I have to wonder why the illustrated instruction for v6 aren't listed on the website, even though the pages are hosted there? All that remains to be done now is calibration and BFO adjustment! :)

73 de N4GIX - Bill

Re: Revisiting lower power output on 40m, V6 #ubitx #v6

Ashhar Farhan
 

Jim,
The power is quite low everywhere in general! Can you see if tweaking RV1 jas any effect?
In order to control the overall gain, the first preamp (Q90) has a 470pf capacitor in the emitter bypass (C81). This capacitor acts more and more like a bypass and hence the stage increases the gain with higher frequencies, thereby, crudely offsetting the loss of gain at higher frequencies.
This gain flattening is not flat and kinda dips around 10 Mhz. 7 Mhz should give 10 watts, not 2 !
- f

On Sun 2 Feb, 2020, 6:00 AM Jim, <n0oct@...> wrote:
Disregard my comment above about the 80m filter and the output at 7.01.  The 80m filter is being selected at 7.000, not 7.010.  The output power values are correct.

Re: Antuino battery voltage

Bill Lamm
 

Finally got around to caring if the batteries worked. Battery tray is fine, I could even see power at the switch, and the switch passing power.. took a triple look at this picture and my Antuino and there it was?!?

Thanks, working now.. little dab will do you..

Re: Revisiting lower power output on 40m, V6 #ubitx #v6

Jim
 

Disregard my comment above about the 80m filter and the output at 7.01.  The 80m filter is being selected at 7.000, not 7.010.  The output power values are correct.

Re: C210 & C216 Missing from main board. Should they be? #ubitx #v6

Curt
 

Jim

I don't know which version you have, but my v4 40m CW output dips on 40m, as best I can tell due to circuit interaction.  I have reduced it just a little by installing SMT inductors at the 45 MHz filter.  I have finally decided that its 'okay' as with this behavior as I can still make some QSOs.  If I get this 50w amplifier from QRP labs built it won't matter.  You may find your 40m SSB output is stronger because its a different circuit configuration.  oh yes if you must, try touching the inductors L5 and L7 - you may see a power increase when operating CW (not that this solution is practical). 

73 Curt

Re: C210 & C216 Missing from main board. Should they be? #ubitx #v6

Jim Sheldon
 

Any zero value components on the schematic are supposed to be missing.  Been that way since the older versions..

W0EB


On Feb 1, 2020, at 6:10 PM, Jim <n0oct@...> wrote:

In looking over my board, trying to trouble shoot the low output on 40m, I see that C210 and C216 are missing from the board, and they are assigned a value of Zero on the schematic, so I'm assuming they are supposed to be missing.  Is this correct?

C210 & C216 Missing from main board. Should they be? #ubitx #v6

Jim
 

In looking over my board, trying to trouble shoot the low output on 40m, I see that C210 and C216 are missing from the board, and they are assigned a value of Zero on the schematic, so I'm assuming they are supposed to be missing.  Is this correct?

Re: Ubitx V^ just assembled, VFO Doesnt Work, no receive/audio

Michael Shreeve
 

At one time  v3 era, I started a YouTube channel,  and did a complete construction playlist for uBITX at CaliforniaKayaker N6GRG channel . Not sure additional info is available for the V6. Definitely somewhat different animal,  but it has a lot of similar content.  I'll research and add to it. 

On Sat, Feb 1, 2020, 2:43 PM <n4gix@...> wrote:

I just wanted to let your "mistake" saved my bacon, as I too plugged the encoder into the main board rather than on the top of the raduino. I was also unsure of where the speaker was to plug in.

I have to ask, "what directions?" as all I received was an illustrated parts list, which while helpful, wasn't much help otherwise.

If it hadn't been for your question and the extremely helpful answers posted in this thread, I'd still be scratching my head. I have to wonder why the illustrated instruction for v6 aren't listed on the website, even though the pages are hosted there? All that remains to be done now is calibration and BFO adjustment! :)

73 de N4GIX - Bill

New TSW Software for the Teensy 4.0/T4-NANO Adapter #v6

Jim Sheldon
 

For those of you that have built, building or planning to build TSW's Teensy 4 to NANO adapter to replace the NANO on your V6 uBITX, We just put the latest and greatest of our T4 software on the www.w0eb.com website.  It's Called TSW_T4_V1.02 and it does all the previous versions did as well as add TEN memory channels to save/recall your favorite frequencies.  The latest software manual is also in the zipfile so you don't have to hunt for it though it's in the Documentation directory for those who would like to download and read through it to see just what kind of capability we bring to the V6 uBITX by swapping out the NANO for a reasonably inexpensive ($19.95 plus shipping) Teensy 4.0 board from PJRC.com.

The T4-NANO adapter will DIRECTLY replace the slow, limited memory NANO with a 600 MHz, 1 Meg of RAM, 2 Megs of Flash memory just to name a few of the advantages of using it.

Remember, the T4-NANO adapter will work seamlessly plugged into a factory V6 Raduino with NO repeat NO hardware mods to the Raduino itself.  The only mod necessary comes if you want to use the IAMBIC keyer as a separate stereo jack for the paddles must be installed.  Due to the nature of the way TSW's programmer improved the CW keyer, we cannot use the on-board Keyer Jack installed on the uBITX motherboard. 

Not quite ready for prime time is a 3D printed, external mount for that little stereo jack.  I'm still waiting on my full kit V6 (with the factory case) to arrive and have been told it should ship within a few days.  I need to verify the dimensions of the rear panel USB cable extension's opening and exact center to center distance between that rear panel jack's mounting holes to finish the design for the paddle jack mount.  The wires will snake through under the USB extension jack and NO modification to the case will be needed for that either.

I have the design of that mount all worked out in the 3D CAD program and just need the actual case on hand to fine tune it before I can release the ".stl" file for it.  My first run, proof of concept mount took 58 minutes to print and the final version should be right around that same printing time for those who have 3D printers.

I have added the PDF file of the V1.02 Software Operating manual here for anyone interested to read. 

Jim Sheldon, W0EB
TSW Project Coordinator

Re: Ubitx V^ just assembled, VFO Doesnt Work, no receive/audio

Bill Leaming
 

I just wanted to let your "mistake" saved my bacon, as I too plugged the encoder into the main board rather than on the top of the raduino. I was also unsure of where the speaker was to plug in.

I have to ask, "what directions?" as all I received was an illustrated parts list, which while helpful, wasn't much help otherwise.

If it hadn't been for your question and the extremely helpful answers posted in this thread, I'd still be scratching my head. I have to wonder why the illustrated instruction for v6 aren't listed on the website, even though the pages are hosted there? All that remains to be done now is calibration and BFO adjustment! :)

73 de N4GIX - Bill

Revisiting lower power output on 40m, V6 #ubitx #v6

Jim
 

So, received my V6 this week.  Power output (CW key down) looks like this:

MHz     Watts
3.5       6
3.75     6
4.0       5.9
7.01     2.5 <- I think the 80m filter is being selected here, so an anomalous result
7.15     2.5
7.3       2.0
10.1     5
10.15   5
14.0     3.9
21.0     3.1
21.1     4.0

I'm familiar with the reduction in output power with increasing frequency.  That is not my concern here.  The low output on 40m is.

It has been suggested in the past that the 30-40m output filter is to blame for the weird low power response on 40m.  I checked both the input and the output of the filter with my O-scope, and the input waveform is *much* uglier than the input waveform for 30m, and for other frequency/filter combinations.   See here:



I pulled one of the toroids (L19 on the input side of the 30-40m LPF). and it was 0.745 uH, about where it should be.  The other toroids seem to have the same number of windings, and scoping on either sides of them produces nice waveforms.

It seems to me that there either is something that is oscillating in the drive/PA producing the ugly waveform, or perhaps it's getting some feedback from somewhere. 

Yes, I know ugly waveforms are the reason that the LPFs are there, but none of the other frequencies produce anything this bad.

Idears?

Jim KK0U