Date   
Re: Purchase of uBitx on hold until?

Eliot - KE0N
 

I am specifically referring to the current rev of the uBitx. Specifically - the audio chip issue and the IMD issue. You stated all of yours are in spec and didn't mention any component issues so I assume you have none. That is helpful, thank you.

Re: Purchase of uBitx on hold until?

Jack, W8TEE
 

Often the blanket statements made here are simply too broad. For example, I now own 3 BITX's and 4 µBITX's and all of them are in spec for 80M, 40M, and 20M. Two are within a dB of being in spec on 15M, but all are outta whack on 10M. For me, since I use 40M and 20M most of the time, I'm fine with my rigs. YMMV.

Jack, W8TEE

On Monday, October 8, 2018, 1:03:17 PM EDT, Eliot Ricciardelli via Groups.Io <ke0n@...> wrote:


I have been watching the development of the uBitx through the recent revisions and querying some owners. If I am not mistaken there are still issues with one or more components of the latest rev. I have emailed hfsigs support to ask when these will be addressed, but have yet to receive a reply.
I get the spirit of this is modding, tweaking and tinkering - but doesn't the fact that there are clear issues with components put pause in anyone else to purchase? Or do you just find a replacement and move on?

Re: K5BCQ uBITX Relay Switched LPF/BPF board

Kees T
 

I should have the corrected 6x LPF Boards sometime this week and will start mailing out the kits per the "6x LPF Board Orders" list in the files section under my call. This is a basic, manually switched, LPF Board design applicable to any QRP rig.

In addition, V2  4x LPF Boards (also coming in this week) use the original uBITX parts and fit in the same location, I'm also trying an experiment with 1 DPDT relay per filter, and full copper fill with ground stitching along RF traces to control impedances. This is the V3  4x LPF board and the circuit was discussed earlier by Allison and others. It has the Hi Band LPF always in series with the other filters, In other words for Rx the Hi Band filter is in the circuit and for Tx the Hi Band LPF AND the TXA. TXB, or TXC  LPF is in series. For further Port to Port isolation, a 100uH choke is in all 12 coil leads. This circuit only requires 4 DPDT relays and also uses the parts removed from the uBITX LPF section.  It's the smallest of the LPF boards and Ant, Rx, and T11 connection points are conveniently located to match the uBITX board. Same as the V2  4x LPF Board.....details are in the "Files" section.

73 Kees K5BCQ 

Purchase of uBitx on hold until?

Eliot - KE0N
 

I have been watching the development of the uBitx through the recent revisions and querying some owners. If I am not mistaken there are still issues with one or more components of the latest rev. I have emailed hfsigs support to ask when these will be addressed, but have yet to receive a reply.
I get the spirit of this is modding, tweaking and tinkering - but doesn't the fact that there are clear issues with components put pause in anyone else to purchase? Or do you just find a replacement and move on?

Re: K5BCQ uBITX Relay Switched LPF/BPF board

Kees T
 

Nick,

Sure 

By Port to Port Isolation I mean the attenuation (lack of coupling) between LPF board input and LPF board output with filters installed but not activated. You want that to be as high as possible. The Rigol 815SA-TG has a dynamic range of ~83dB so that should be more than adequate to see/test it. 

Unwanted paths could be created via capacitive coupling or any other type of coupling. The relays used could be a source, the trace widths, the distance over a ground plane, test leads, etc, etc. 

When I looked at the relays (maybe this is what others were calling "blow by")....the capacitance between the armature and the N/O contact is about 1-2pF (that's fine), the capacitance between the armature and the coil is about 4-5pF (not too bad .....but getting worse). However the 6x LPF boards use 12 relays, that's a lot of relays. 

I originally decided to double up the RF Signal path since we're using DPDT relays (hey, free contacts), however, the coil/armature capacitance is now in parallel and can go up to 8-10pF per relay (even worse). If you use one set of contacts for the RF Signal and the other for RF Ground you put those two capacitances is series which reduces the overall coupling (this is a good thing). 

The relay coils are directly connected to power and long leads for relay selection. It would be good to isolate the coils with series RF chokes from the power source and other relay coils.....both power and ground. I believe you are using those on your board, Nick. Excellent (if needed) and you will see in the next paragraph those relay coils need to be RF isolated from each other.  

The 6x LPF boards use 12 relays, again, that's a lot of relays. When I measured any of the SMA connectors with and without LPF plug-in boards (not energized, of course), I see about 3-4pF (not a problem). However if I measure the capacitance between the SMA center conductor and the 12V power line I see 107pF. That IS a problem at RF and probably the reason why my LPFs will only attenuate down to about 40-50dB from the peak.

73 Kees K5BCQ

Re: uBitx First Contact

YO8UFO
 

Thanks a lot for the informations about setting the PA bias. That helps a lot since all the informations about setting the bias are taking in consideration measuring the current drawn by the whole board, from the power source. I never thought about measuring the current only in the PA unit. That's awesome to discover./// And about people who worked in producing the uBitx, people which are working in a different economy system, I didn't wanted to be mean or cruel. I just wanted to point this situation as it is. I DO respect what they accomplished and I DO enjoy playing with the board. /// And one more thing about RV2 and RV3. In the schematic are rated at 10K, each. It's true that I did not disconnect them from the board but I measured them individually and they are 2.1 kilo each, and I'm sure that I didn't measured middle pin, the wiper. Not 10k but 2.1k.

Re: Bandpass Filter Layout Design #ubitx #filters

Curt
 

Bruce

Possibly nothing is for sale yet, but note lots of effort around the world to improve this.  One solution is a daughter board that hosts new output relays.  Others are evaluating more substantial solutions.  Some bands may already be compliant - worthwhile to examine the available data and consider the harmonic behavior of your antenna(s).  It is understood by the community that very few of us own spectrum analyzers.  Also visit other uBITx sites on the web for more info. 

73 Curt

Re: uBitx First Contact

Curt M.
 

"Weird that your uBitx arrived with RV1, RV2, RV3 all set incorrectly.

Jerry, KE7ER"


Mine arrived where it was not in alignment and the bias was not properly adjusted.  I couldn't tune a thing.  I could tell that people were talking but they could not be tuned in.  After working back and forth with WWV and a few known good signals I was able to get my receive where it needed to be.

As far as the finals go, my idle current was well below the specified amount in the setup document and the power output tested on 40m was much lower than expected.  I went though the bias adjustment procedure and all is well.  

Not sure that all of these have gone through the QC that they are said to have been through.

Re: uBitx First Contact

Curt
 

Daniel

give yourself credit for participating in ham radio, with a transceiver requiring user attention to assembly - and perhaps more user attention to its use. 

ham radio is about enjoying radio science - and learning ! 

I see that Jerry has provided clear instruction on how to properly bias the rig.  See what you discover.  If indeed your rig was missed in the factory - remember those are people at work.  While they would appreciate the feedback they may have missed something, your rig seems fine still - so be gentle. 

Don't discredit your work on your antenna - understand it and enjoy what it can do.  Great to have you on the international airwaves. 

Appreciate that this is a useful transceiver designed and produced with a different kind of economics - let's enjoy the fact that so many people can obtain one.  Do be willing to work with the network to improve it as required or desired. 

73 Curt

Re: uBitx Software Update

Jens <hb9joi@...>
 

Thanks Bill ,

so if the 10 Hz tuning steps will be available with KD8CEC firmware
then I will see to do the update . To can go down from 100 Hz to
50 Hz and 10 Hz is my major intention for an update ,
other are not so important , because I have the original LCD-display 16x2.

73 , Jens / HB9JOI

+++



-----Ursprüngliche Nachricht-----
From: Bill Cromwell
Sent: Monday, October 8, 2018 4:43 PM
To: BITX20@groups.io
Subject: Re: [BITX20] uBitx Software Update

Hi Jens,

I installed the CEC software in my uBitX and it took care of all the
issues I expected it to. First is that tuning step. It will go to 10 Hz
steps and up to 1kc steps for larger changes in frequency. there are
steps at 50, 100, and 500 cycles per second too. It is easy to get use
that feature. The other, equally important feature is the CW actually
*works*. The original CW operation is erratic. I haven't tried changing
the sidetone so I can't compare the original software and CEC for that.

I hope this helps.

73,

Bill KU8H

On 10/08/2018 10:01 AM, Jens wrote:
Hi Jack ,

at first thanks for Your answer .
But before I want start an update ... I have to questions about the result
:
Now my uBITX (v3) has the original firmware .

There are two things which make me not happy :

1) The CW sidetone frequency I can choose in the menue and also adjust
but the
new setting will absolutly not saved by press for confirm the PTT... -
like described.

2) The transceiver frequency tuning (enccoder-) steps are to much large
with 100 Hz .
I saw , that with the firmware 1.08 from KD8CEC I could it can change
down to 10 Hz .
Is that right or not ... ???

73 , Jens / HB9JOI
--
bark less - wag more

Re: uBitx First Contact

Jerry Gaffke
 

Daniel,

Setting RV2, RV3 without watching current can easily blow the IRF510's.
It takes a very small turn to the left to go from 100 mA to 5 Amps,
and the IRF510's will get extremely hot in a matter of seconds.



Procedure to set RV2,RV3 using your 200mA meter:

Power down.

Insert the 200mA meter in series with the brown wire of the black,brown,red connector
where the 12v power comes into the board.  This measuring of current in the brown wire
will only see the sum of the drain currents going into the two IRF510's.

Set RV1, RV2 fully clockwise.  This is the minimum setting, the uBitx is backwards
from most controls on other equipment.  Unfortunately

Attach 50 ohm dummy load into the antenna jack.  Or at least an antenna of some sort.
We shouldn't be transmitting anything much, because we won't have any audio going in.

Power up the rig.  Set to a frequency that your dummy load (or antenna) can handle.

Press Push-To-Talk switch on the mike to start transmitting, but do not speak into the mike
or otherwise give the rig audio (such as PSK31 from a computer).
The 200 mA meter should still show close to zero mA, since there is no audio.

Turn RV2 counter-clockwise while pressing PTT until the meter shows 100 mA.
You will have to turn it perhaps halfway before there is any movement at all on the meter,
but then the mA reading will increase very rapidly as you turn the control.
So adjust the control very carefully, do not exceed 100 mA.

Now adjust RV3 while pressing PTT, bringing the meter reading up
an additional 100 mA to show 200 mA.

Now done. 
RV2 and RV3 on the uBitx are set properly.



RV1 determines how hard the final amplifier is driven.
If you have any way to monitor power out (perhaps a diode RF probe, built for under a dollar),
then increase RV1 (turning counter-clockwise!) watching the power increase, stop turning
when the power out no longer increases very fast.  Then back off to perhaps 90% of that
maximum power reading.  Having RV1 set too high can cause intermodulation distortion
and splatter across the ham band.  Other nearby hams may be able to receive your signal
and tell you when you have RV1 set too high.

Weird that your uBitx arrived with RV1, RV2, RV3 all set incorrectly.

Jerry, KE7ER


On Mon, Oct 8, 2018 at 08:45 AM, Daniel wrote:
RV2 and RV3 can be set with an amper-meter but mine it's rated only to maximum 200 mA so I can't use it for that specifically.

uBitx First Contact

YO8UFO
 

 Hello everyone! It has been a while since I got my uBitx, I tried so hard to find some kind of an enclosure because working with the board itself it's kind of hard life for me. Wires all around... So, finally, I made my first radio contact over uBitx. And I'm proud that it was done QRP. It was a PSK31 conversation with a station from Italy and a few minutes later with a station from Poland. I'm currently living in Denmark so I can easily say that's ...faraway. But I want to point few aspects for those like me, new to this amazing hobby. Some of the aspects will encourage, some of them might dissapoint. I will start with the negative aspects first. As I said in some earlier posts, I deeply respect and appreciate the work of Ashar Farhan and his team. This uBitx it's  a great tool and it's the cheapest gateway to HF. I don't like to say it's for poor people as I read on some other websites, but it's for those who don't want to spend a fortune or so, for a hobby that they might find it later way too difficult. The uBitx is kind of a DEMO transceiver if you ask me. So, after I installed the board on the enclosure I found suitable for the project, I said it's time for me to "shout" on HF. I admit that I have a very poor antenna, an attic zig-zag dipole and I can't expect that much from it, but the proof that it works came last night, 2 contacts on 40m, PSK31. What I want to point is that I tryied so hard and for so long to see a confirmation that the rig works. Just one contact and it was enough for me. But no contact was made since last night. Why, you might ask. I tell you why. Because for some reasons that I suspected from the beginning, the board did NOT came ready-for-use as the seller tells. Those two variable resistors for biasing the finals, RV2 and RV3 were all the way to the right and RV1 variable resistor it's still all the way to the left and I'm sure that can NOT be right. It's just doesn't make any sense. Why you want to put a variable resistor and set it all the way to one end or another? In my mind at least, it's weird to see this. So, because I don't have that much measuring devices to set the right current for the PA bias, I checked the Internet for some pictures with the board and I just set those three RV as I saw in the picture. That's a nasty way of doing science but when you don't have nothing to work with, you might want to find a way to break through. Now that I set them "right" , half an hour later I had been "read" on HF and I got a "599" report from the Italian station but I take this with a grain of salt. It just can not be 5 by 9 with that crappy antenna and maybe an astronomical SWR. And for those curious about the antenna, as I said, it's a zig-zag dipole in the attic, I cut each leg at 10 meters and 8 centimeters, as best as I could. It's a copper wire from a secondary winding from a burned transformer rated to 24V, 2A. I used some couple of meters of TV coaxial cable, I might guess it's a 75 Ohms impedance. I didn's used any balun but kind of a choke coil, I turned some extra coax over my hand and catch with plastic strips. Not professional at all but as long as it worked, I'm happy and proud and confident to step a little bit further. And as a power supply I use a power unit from a very old computer, 12V, 10A. And by the way, about burning the finals, I want to say that without knowing what I do, I transmited with no antenna at all and the finals are still ok. I got those contacts after this happening. I don't encourage anyone to test this one their rig, I done this myself and it's enough. Maybe I didn't burned them because the RVs are still not in the right place. Right now I'm  concerned about RV1 position and I'm still playing with it, I can't remember in what position was when I made those contacts. I read somewhere here on the group that it "should" be around 2/3 counter-clockwise. Mine it's still on maximum left , it was like this when the board came and I don't know after what electrical characteristic I should look or where exactly I should do the measurement to set it right. RV2 and RV3 can be set with an amper-meter but mine it's rated only to maximum 200 mA so I can't use it for that specifically. I hope that what I wrote can help someone like me, looking for the right answers in all the wrong places. But finally I found this group and I want to thank again for all the people who answered my questions in my previous posts. 

Bandpass Filter Layout Design #ubitx #filters

BruceN
 

Has anyone come up with a layout design for the bandpass filter for the ubitx which would minimize coupling of harmonics?  I've done some looking around the internet and it seems to be an esoteric topic needing a lot of study to design an efficient one.  Maybe someone out there has already done that study and did the design.  If so, I missed it.

BruceN, K4TQL

Re: uBitx Software Update

Bill Cromwell
 

Hi Jens,

I installed the CEC software in my uBitX and it took care of all the issues I expected it to. First is that tuning step. It will go to 10 Hz steps and up to 1kc steps for larger changes in frequency. there are steps at 50, 100, and 500 cycles per second too. It is easy to get use that feature. The other, equally important feature is the CW actually *works*. The original CW operation is erratic. I haven't tried changing the sidetone so I can't compare the original software and CEC for that.

I hope this helps.

73,

Bill KU8H

On 10/08/2018 10:01 AM, Jens wrote:
Hi Jack ,

at first thanks for Your answer .
But before I want start an update ... I have to questions about the result :
Now my uBITX (v3) has the original firmware .

There are two things which make me not happy :

1) The CW sidetone frequency I can choose in the menue and also adjust
but the
new setting will absolutly not saved by press for confirm the PTT... -
like described.

2) The transceiver frequency tuning (enccoder-) steps are to much large
with 100 Hz .
I saw , that with the firmware 1.08 from KD8CEC I could it can change
down to 10 Hz .
Is that right or not ... ???

73 , Jens / HB9JOI
--
bark less - wag more

Re: uBitx Software Update

Jens <hb9joi@...>
 

Hi Jack ,
 
at first thanks for Your answer .
But before I want start an update ... I have to questions about the result :
Now my uBITX (v3) has the original firmware .
 
There are two things which make me not happy :
 
1) The CW sidetone frequency I can choose in the menue and also adjust but the
new setting will absolutly not saved by press for confirm the PTT... -  like described.
 
2) The transceiver frequency tuning (enccoder-) steps are to much large with 100 Hz .
I saw , that with the firmware 1.08 from KD8CEC I could it can change down to 10 Hz .
Is that right or not ... ???
 
73 , Jens / HB9JOI
 
+++
 
 
 

From: Jack Purdum via Groups.Io
Sent: Monday, October 8, 2018 2:53 PM
To: BITX20@groups.io
Subject: Re: [BITX20] uBitx Software Update
 
Jens:
 
I just googled "How to install the Arduino IDE" and got 5.6 million hits! I'm sure one of those will be just perfect to get you started. It's really very simple to do and it will open a new world to you and may become a new source of enjoyment for our hobby. If you ever get to the point where you want to start playing around with programming these devices in C, I can suggest a book for you!  :>)
 
Jack, W8TEE
 
On Monday, October 8, 2018, 6:26:38 AM EDT, Jens <hb9joi@...> wrote:
 
 
Jens ,
 
I am little confused :
 
“...The first is to compile the source from the Arduino IDE ....“
 
How this is to do ... ???
I have absolutly no sxperiences and knowledge about Arduino-Nano ...
 
73 , Jens / HB9JOI
 
+++
 
From: Jens / DH1AKY
Sent: Sunday, October 7, 2018 9:35 PM
To: BITX20@groups.io
Subject: Re: [BITX20] uBitx Software Update
 
Hi Jens,

not a problem at all: please look here: http://ubitx.net/
Also you find many youtube videos concerning the KD8CEC firmware.
Ian also describes how to install on his blog http://www.hamskey.com/2018/09/ubitx-firmware-cec-version-11-release.html#more
There he provides precompiled hexfiles for easy upload. You don't need the bitx Manager tool at this point.
See http://www.hamskey.com/2018/01/how-to-upgrade-ubitx-firmware.html for installing the firmware.

73 Jens/DH1AKY

Re: uBitx Software Update

Jim Sheldon
 

Jens,
Jack is absolutely right and even for a beginner, it's easy to install the Arduino IDE.  He mentions a book, but appropriately doesn't mention the fact that he (Jack) wrote the book.  It's about the C language for Arduino (and more) and it's an excellent place to start learning C.  I'm definitely not a programmer, but Jack's book has been an immense help to me when I try to understand how the various software for the uBITX is supposed to operate.  

Jim Sheldon, W0EB

------ Original Message ------
From: "Jack Purdum via Groups.Io" <jjpurdum@...>
Sent: 10/8/2018 7:53:53 AM
Subject: Re: [BITX20] uBitx Software Update

Jens:

 If you ever get to the point where you want to start playing around with programming these devices in C, I can suggest a book for you!  :>)

Jack, W8TEE

On Monday, October 8, 2018, 6:26:38 AM EDT, Jens <hb9joi@...> wrote:



Re: Miswired USB, need help fixing display #ubitx #radiuno

_Dave_ AD0B
 

You blew your arduino. 
They are cheap and not to bad to replace.

Re: uBitx Software Update

Jack, W8TEE
 

Jens:

I just googled "How to install the Arduino IDE" and got 5.6 million hits! I'm sure one of those will be just perfect to get you started. It's really very simple to do and it will open a new world to you and may become a new source of enjoyment for our hobby. If you ever get to the point where you want to start playing around with programming these devices in C, I can suggest a book for you!  :>)

Jack, W8TEE

On Monday, October 8, 2018, 6:26:38 AM EDT, Jens <hb9joi@...> wrote:


Jens ,
 
I am little confused :
 
“...The first is to compile the source from the Arduino IDE ....“
 
How this is to do ... ???
I have absolutly no sxperiences and knowledge about Arduino-Nano ...
 
73 , Jens / HB9JOI
 
+++
 
From: Jens / DH1AKY
Sent: Sunday, October 7, 2018 9:35 PM
To: BITX20@groups.io
Subject: Re: [BITX20] uBitx Software Update
 
Hi Jens,

not a problem at all: please look here: http://ubitx.net/
Also you find many youtube videos concerning the KD8CEC firmware.
Ian also describes how to install on his blog http://www.hamskey.com/2018/09/ubitx-firmware-cec-version-11-release.html#more
There he provides precompiled hexfiles for easy upload. You don't need the bitx Manager tool at this point.
See http://www.hamskey.com/2018/01/how-to-upgrade-ubitx-firmware.html for installing the firmware.

73 Jens/DH1AKY

Re: µBITX v3 : TX OK but no audio on RX

iz oos
 

Check voltages as well to the TDA and the collectors of the 2N3904


Il 08/ott/2018 11:45, "F5PCX" <JeDecr@...> ha scritto:
Thanks to all for your replies.

Mike : Yes, you're right : I changed Q70 and the issue is still there.
Raj : I also checked the volume connections and even tried another pot : nothing new.

I think I'll test now the continuity beetween the connectors and the main board.

73 - Jean F5PCX.

Re: µBITX v3 : TX OK but no audio on RX

 

Jean,

Check the connection M1-M2 for continuity on RX. This would be on relay K3 pins 3 and 5, pin 1 should be a square pad unused.. there is no pin 2.

1- 3- 5-- 8
16-14-12--9

Raj

At 08-10-18, you wrote:
Thanks to all for your replies.

Mike : Yes, you're right : I changed Q70 and the issue is still there.
Raj : I also checked the volume connections and even tried another pot : nothing new.

I think I'll test now the continuity beetween the connectors and the main board.

73 - Jean F5PCX.