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

Evan Hand
 

Stefan,

I tried the same thing: an MFJ 100 watt dummy load connected and a separate recieve near by.  I also did not get any indication on the receiver (I should not have been surprised, it is very well shielded).  My work-around was to insert a 50 ohm "T" to the dummy load, and then a short piece of wire inserted into the center of the unused connection of the "T".  You can adjust the length of the wire and the separation from the receiver to get the right level of signal to test.  I was using an RTL-SDR dongle and free spectrum analyzer program to check on signal purity.

FWIW
73
Evan
AC9TU

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

Michael Shreeve
 

Jim, I have a version 4 I believe that didn't seem like it was in the right spot for the filter you speak of and will try some of what you are saying. It just doesn't have the great sound that the ver 3 does that I have. Will put this in favorites so I can do this project. How different is the procedure for the V6 ? Does it use 10mhz like the v4 and probably v5 ?

Re: sotabeams filter installation

Joel Trenalone
 

oh....I failed to mention in inserted a .1 uf cap in the line attached to AFOUT (RB15). 

WA3NFV builds μBITX V6

Dan Mitten - WA3NFV
 

I received my μBITX V6 this week while I was on a biz trip and assembled it on Friday evening. The total assembly time was under 2 hours, if I did it a second time it would be about an hour or less. (I lost no hardware during assembly, but was very reassured to see the spares!)

I have some observations which may be helpful:

1. The speaker attaches to the 2 pin plug "P4". This is a bit confusing since references to the speaker appear at least four time on the schematic.
2. Install the computer after the main board is installed, this should work easier.
3. Install the encoder after the main board is installed.
4. Remove any connector panel nuts before attempting to install the main board.
5. My display reports "V6.1"

Comments:

1. My VFO is way off frequency regardless of the band.
2. The Mode is always backwards! (USB/LSB) i.e. LSB indicator yields USB operation, USB indicator yields LSB! The default band/ Mode setting seems to be OK on the bands I've tested. Might this be responsible for some of the garbled audio reports, from others? The carrier Osc seems to in the right place.
3. Considering the proximity of the audio gain control and the mic connector the knob could be smaller.
4. My 17 M selector appears to work correctly.
5. Frequencies below 1 MHz, indicate correctly.
6. Harbor Freight (USA) has a cord that fits the serial connector that is included with the kit. It is part of one of their lighter adapter kits for Cell Phones and terminates in the common USB connector for a computer. It is only 14 inches long, the down side.

Results:

1. Eight contacts have been made, four on 40 Meters and four on 10 Meters. The 40 Meter contacts have been 4-850 Miles! The 10 Meter contacts 4-35 Miles. (I hate QRP)
2. The Crystal filter works very, very well and has good unwanted sideband suppression and selectivity. The BFO/Carrier seems very well placed, frequency wise. Everybody that should sound good, does sound good.
3. If my TS-2000 hears the signal, this radio hears it. I was surprised at the sensitivity on 10 Meters.

Epilogue:

I would like to see "hz" read "Hz".
I'm glad I got mine early, I see the line getting long!

Thanks for allowing me to join the group here.

73,
 
Dan WA3NFV
 

Re: sotabeams filter installation

Joel Trenalone
 

Hello All,
thought I’d share my success with a simple hookup. There are several ways to hook this up, and this is one that I can verify works well  on the V5 board.


I removed r70 on the advise of a group member. I connected the AFIN on the sotabeams to the Q74 side of the removed r70, and connected the AFOUT (RB15) to the other pad of the removed resistor. I powered the sotabeams board from the recieve rail of the ubitx so it has no power during transmit. I installed the switch (between SSB/CW) and led and it works great. 

Joel,
KD6AGW

Re: BitX40's For Sale

George P Linehan III
 

Thanks Jim 73!

On Feb 2, 2020, at 6:50 AM, Jim WB2LHP in MI <jmarco1955@...> wrote:


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

Jerry Gaffke
 

Unfortunately, harmonics on the v3,v4 are significantly worse when the relays are in sockets.
See this thread:  https://groups.io/g/BITX20/message/61018

Do not use sockets for the three relays used to select the transmit LPF.

Jerry, KE7ER


On Sun, Feb 2, 2020 at 07:23 AM, Lawrence Galea wrote:
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
 

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.