Date   
Re: Dirt cheap uBitx case #ubitx

N1AFF - formerly KB1JPW
 

That's pretty slick looking.  

I got it all together last night, plugged in and no smoke. I my antenna was already tuned up for 80m and switched over there. 
I was picking up cw and phone pretty good at a medium volume. And then, there was nothing....

http://ubitx.net/fix-tda2822-audio-amp/ Sigh, I've got one of the WX chips.  All I get now when I power on is a slight pop and then silence.  It looks like I need to go ahead and wire up a lm386 in the meantime

Prior note - I did mean RJ45 - I've got a Yaesu MH-31 handheld mic I'll be adding. I'll be adding a usb port on the back for digital and CAT use.  I've got an old GPS antenna that I'm going to steel some of the cable from for RF signals.  My leads were shortened as much as I can for the moment though for testing. The last pic with the leads was prior to trimming and soldering directly to the board.  Once I get the RF wired up, top speaker, and other jacks installed I'll get some more pics all together once the case is painted.  

WSJT-X for uBITX using LINUX

Rod Davis
 

Hi All,

In the past, WSJT-X running on Linux would not work with the uBITX. The problem was
the Hamlib FT-817 protocol was not successfully connecting to the uBITX at startup.

For the past two weeks I have been working with Bill Somerville, G4WJS on the issues.
I explained the nature of the problem, and provided CAT link protocol logic analyzer traces,
and did bench testing of new Hamlib code Bill provided.

Bill took a lot of time out of his schedule to work on this, and it has borne fruit.

Bill identified the area that needed changes,  provided modified software,  and stayed
with the problem through quite a few iterations of testing. I know it took a lot of his time,
and I am grateful for his persistence.

Bill modified the Hamlib FT-817 protocol to resolve the problem, and he indicates
there should be an official WSJT-X release including this patch soon.

I will post details when the new WSJT-X is posted.

I believe we owe Bill, G4WJS, a debt of gratitude for his expertise, hard work, and persistence
in support of the uBITX community.

Rod KM6SN

FT8 on uBITX experiences

Rod Davis
 

Hi All,

Are there people out there using the uBITX for the FT8 digital mode?

Please let me know your experiences with that.

Public post or private email, your choice.

Thanks in advance,

Rod KM6SN

CW Choppy

Don Meyerhoff
 

Hi,

Just completed wiring up my ubitx. Receives great and transmits at full power. However, when I send CW it is choppy and fragmented. I'm using a straight key. Has anyone experienced this?

73

Don Meyerhoff
WA2SWX

Re: Please play well together

Jim Strohm
 

FWIW ... Ashhar's role in BITX is basically the same role that technical writers play -- they are at the VERY END of the supply pipeline.  After their work is complete and they ship their product, it's totally out of their hands how long it will take before their products are delivered to the end-users' hands.

Please be nice, and please appreciate what Ashhar and technical writers do.  Without us -- yes, I'm a tech writer -- things would not be as bright and shiny as they are.

73
Jim N6OTQ

Re: ubitx case mount question regarding micro USB connector raduino

Tom Christian
 

I'll see what state everything is in once the install is finished and follow up depending on the outcome.  Thanks, Gordon!
Tom
AB7WT

Re: #uBITX Firmware KD8CEC - IF-Shift etc. #ubitx

Guy N7BIR <sgbridge@...>
 

Jerry, Michael- Thanks for the feedback. I’m not getting any RF readings using either SSB or CW. Will also try checking the other bands. Was really strange. The radio worked fine since I received it in January. Then I turn it on and no RF. Nothing else had changed. 
Will try your suggestions. 
Thanks again,
 Guy N7BIR 
,

Re: FT8 on uBITX experiences

John P
 

I've been making progress on getting the BitX-40 to work on FT-8. It transmits and receives but I haven't gotten it all hooked up permanently yet; hopefully I'll get to that tomorrow. 

The only issue I had was keying the transmitter. I built a VOX circuit using an LM358 and LCA-110 SSR.

--
John - WA2FZW

Couple of questions for the gang

Gary Shriver
 

Hey guys,

Talk about frustrating.  My uBitx arrived today and I leave for 6 days tomorrow.  Uggg.   Have to wait until I get back.

 

But I do have a couple of questions.  I opened the box and saw that I have the WX version of the TDA 2822.  I am planning on picking off the wiper of the audio pot and ground to feed a line input mixer I use in the shack that feeds amplified speakers.  But, as I understand it, if the WX TDA 2822 does go up in smoke, the wafer leg of the audio pot will still be hot for my line level audio feed right?? 

Also, I have a couple of 8-ohm 5-watt resistors.  Should I run one of those where the speaker should go and even run an additional 8-ohm resistor in series to get the load at 16 ohms?  That will help the TDA 2822 keep from smoking itself right? 

 

Thanks..  waiting to dive into this thing really stinks..

73-Gary

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Re: FT8 on uBITX experiences

Xcott Craver
 

Hi,

I got FT8 working with the uBITX, an EASY-DIGI interface and a cheap USB-RS232 dongle.  I've been using FT8 transmissions to measure antenna performance using pskreporter.info, grabbing the occasional DX on the side while I'd have the antenna up.  

The one problem I encountered was that my laptop (Macbook) would not recognize the external audio plug.  It turns out this was caused by the uBITX output volume:  if it was anything above the minimum audio level, the Mac would treat it as a non-audio signal and default to the internal mic.  If you have a Mac I recommend starting with the lowest audio level on the uBitx, and raising it as needed (likely it won't be needed.)

Thanks, Xcott K2CAJ

Re: #uBITX Firmware KD8CEC - IF-Shift etc. #ubitx

Jerry Gaffke
 

Curious.
Was it plugged into an antenna?
If so, an electrical storm, or QRO ops on a nearby antenna could have blown Q90.
Happened often enough on the Bitx40, but I don't recall any reports of this on the uBitx.

With PTT pressed, do you see 12v on the TX rail?

With PTT pressed, Q90-emitter should be above ground, and Q90-base another 0.6v higher.
You can check this with a DVM, using DC volts.

If Q90 looks ok, could look at Q911,Q912, Q92,Q93,Q96,Q97 in a similar manner.

And as Michael suggested, use a nearby receiver while attempting to transmit CW, 
see if you can hear that CW signal.   

How do you know the finals are OK?  
Measure the current into PA-PWR, should be around 200 ma if all is well.

Check the toroids from Q90 on for broken wires, shorts, bad solder jobs.

Maybe put a 50 ohm resistor across pins 5 and 2 of T11 as a dummy load prior to the
relays and LPF's.  If that resistor gets hot (will smoke if under a Watt or two)
that means you have trouble in the relays or LPF's or antenna connector and beyond.

Keep the power supply at 12v or so while testing.
Fuse it at 2 or 3 amps unless feeling brave, especially while prodding around in there.

Jerry



On Mon, Mar 12, 2018 at 02:01 pm, Guy N7BIR wrote:
Jerry, Michael- Thanks for the feedback. I’m not getting any RF readings using either SSB or CW. Will also try checking the other bands. Was really strange. The radio worked fine since I received it in January. Then I turn it on and no RF. Nothing else had changed. 
Will try your suggestions. 
Thanks again,
 Guy N7BIR 
,

Re: 13.8 v power supplies safe for bitx?

Dexter N Muir
 

For those worried about Voltage supplied to BITX/uBITX kits: Please consider History.
The "12V" standard derives from automotive - 6x 2V lead-acid cells in series (or, for electronics, 8x 1.5V 'standard' zinc-carbon dry cells). Later more precise measurement found they 'rested' or maintained best at 2.2V, so 13.2 became the 'standard'. A decent high (10-hour?)-rate charge pushes that to 2.3V/cell, so 13.8V.
Most electronics designed for this 'standard' will allow a little 'overhead', with e.g. electrolytic capacitors rated to 16V. They also cope well at the recommended minimum V/cell under sustained discharge for longevity of lead-acids (1.85V or 11.1V for 6 cells).
The above from (dimming) memory ...
73 de ZL2DEX

Re: Couple of questions for the gang

Jerry Gaffke
 

If you plan to replace the WX part, just take it out of there before powering on.
Can clip the pins, then heat them up and pluck them out one by one.

Or maybe just clip pin 2 free, the power pin.  Could later patch it back in place 
once you add the LM7805 mod.

Alternately, cut the trace Ron shows you here so the WX part sees no 12v
    https://groups.io/g/BITX20/attachment/44329/0/audio-fix.pdf
If you then put Ron's LM7805 in there, the WX part will likely do just fine.

No need to attach the wire from the pot wiper pin to the TDA2822, just run that wire off to you amp.

Seems that mostly what blows the WX is more than 7 or 8 volts.
The 5v regulator or a different brand TDA2822 should fix that.
An 8 ohm speaker as a load should be fine, if worried check the TDA2822 temperature
with your finger when it's working hard on a big incoming signal and the volume turned up.

Jerry 


On Mon, Mar 12, 2018 at 02:14 pm, Gary Shriver wrote:

Hey guys,

Talk about frustrating.  My uBitx arrived today and I leave for 6 days tomorrow.  Uggg.   Have to wait until I get back.

 

But I do have a couple of questions.  I opened the box and saw that I have the WX version of the TDA 2822.  I am planning on picking off the wiper of the audio pot and ground to feed a line input mixer I use in the shack that feeds amplified speakers.  But, as I understand it, if the WX TDA 2822 does go up in smoke, the wafer leg of the audio pot will still be hot for my line level audio feed right?? 

Also, I have a couple of 8-ohm 5-watt resistors.  Should I run one of those where the speaker should go and even run an additional 8-ohm resistor in series to get the load at 16 ohms?  That will help the TDA 2822 keep from smoking itself right? 

 

Thanks..  waiting to dive into this thing really stinks..

73-Gary

U1 Question

fbeafore@...
 

I received my uBTX last week.  Finished it this weekend. Test transmits on 40 Meters. Have yet to test other bands. I have no audio. My system "serial number" is hand marked 310/3. Could this have the bad U1.

Results of U1 test:

Audio from a generator in on pins 6 and 7 (input) no audio at speaker.

Audio from a generator in at pins 1 and 3 - I have audio at the speaker. 

Voltage at pin 2 (Vcc) = 12.02 volts

It looks like a bad U 1 to me....... Yes/No ???

F. Beafore / WS8B

Re: DHL delivery attempt

Elliott J Olson
 

Are you writing to us from 2 weeks in the future? ;)
If not, please set your clock/calendar.

On 2018-03-25 06:02, Bill Robbins wrote:
My Bitx20 delivery was attempted today by DHL and I was out of town.
The shipment requires signature. After much searching I found the DHL
number for redelivery and waiver of the signature requirement. I
thought it might be useful to others.
800/225-5345
Bill
WA8CDU

Re: #uBITX Firmware KD8CEC - IF-Shift etc. #ubitx

Guy N7BIR <sgbridge@...>
 

Thanks for the clarification Ian. Now if I can just get it to transmit again !

Regards,
Guy N7BIR 

Re: uBITX Firmware CEC Version Added WSPR function, I am looking for a beta tester. #ubitx

Philip
 

Hi Ian.

Playing with it a bit this evening, no issues found.
Request time now, it would be nice if you could set the TX power in the WSPR beacon on each band.

Philip G7JUR

Re: U1 Question

Jerry Gaffke
 

That's a dual amp. 
We use the in on 7, out on 1, side. 
The in on 6 out on 3 side is left unused for now.
Voltage gain is around 40 dB, or a factor of 100.
So 0.01 volts of AC in should give 1 volt out, and be plenty loud.

Anyways, if you drive audio between ground and pin 7,
and hear nothing on the speaker, quite likely a bad U1. 
What maker's logo does it have, "WX" by any chance?  Or maybe "FCI"? 
Any obvious damage, like a crack in the plastic?


On Mon, Mar 12, 2018 at 02:59 pm, <fbeafore@...> wrote:
I received my uBTX last week.  Finished it this weekend. Test transmits on 40 Meters. Have yet to test other bands. I have no audio. My system "serial number" is hand marked 310/3. Could this have the bad U1.

Results of U1 test:

Audio from a generator in on pins 6 and 7 (input) no audio at speaker.

Audio from a generator in at pins 1 and 3 - I have audio at the speaker. 

Voltage at pin 2 (Vcc) = 12.02 volts

It looks like a bad U 1 to me....... Yes/No ???

F. Beafore / WS8B

Re: FT8 on uBITX experiences

 

I have been running FT8 on both the Bitx40 and the Micro for some time now. I used a easydigi kit and a rs232 interface for PTT. I have also tested the CEC cat software setup as a FT-817 and also works very well.

Only thing I have seen is drive levels from the radio below 1200Hz and above 2000Hz is very low.

I chose to reduced my overall output power to be 5w or under on all bands by setting the drive with CW key down on 80M in small bursts. FT8 can be very demanding on the finals so running full power on the stock setup might not be a good thing. I have been looking at adding a fan or case mounting my finals with isolation kits.

Best of luck


--
David

 N8DAH
Kit-Projects.com

Re: uBITX Firmware CEC Version Added WSPR function, I am looking for a beta tester. #ubitx

Ian Lee
 

Philip 

Thanks for test and feedback.
In this version, I went to my home with an antenna and tried to make a notice after testing.
I am so glad that all the issues have been resolved. I will post separately for the cause and technology sharing.

There is a way to put db in the WSPR input field. You can put the output of the transmitter you use there.
This is just to put the radio's output information into the WSPR Message.

It seems that very little hardware modification is needed to control the output of the radio.
First of all I'll put it on my Todo List. Later on, we should think together.

Thanks again

Ian KD8CEC

2018-03-13 7:43 GMT+09:00 Philip <philip.g7jur@...>:

Hi Ian.

Playing with it a bit this evening, no issues found.
Request time now, it would be nice if you could set the TX power in the WSPR beacon on each band.

Philip G7JUR



--
Best 73
KD8CEC / Ph.D ian lee
kd8cec@...
www.hamskey.com (my blog)