Date   
Re: FT8 on uBITX experiences

John
 

I've been playing with it for 2 days on 17 and 20m. Just used the cat control and a USB soundcard.
Have worked distances up to 1900 miles, even received a reception report from Italy. And that with my unturned 10-160m end-fed up in the attic.

John

Re: The issues of the TDA2822

Al Woodhull
 

My uBitx, ordered January 12, arrived today. It appears to have the possibly defective WX version of the TDA2822. Before
I start to play I have this question: I understand that not all of these chips are defective. If I just go ahead and make all
connections and power up the rig, can anything else besides the TDA2822 be damaged? If I don't have to worry about
causing other problems I'm inclined to want to make a simple test like this rather than making the effort to add a voltage
regulator or a mini-board with a 386 when I don't really know that they are needed.

Al Woodhull N1AW
Leyden, Massachusetts

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

Ian Lee
 

Philip, Carlos and all

For the WSPR Beta version. Since the HEX file and the uBITX Manager link are in the thread, I send mail from here.
I posted uBITX Firmware (KD8CEC Version) which can beta test WSPR function.
(Version : 1.51W)

It does not use any device to send WSPR the such as the previous version. Only one uBITX board is required.
(A wristwatch within 5 seconds of the error range is also required.)

The problem with previous versions was that the Band Pass filter was not applied properly and the frequency was transmitted outside the WSPR band.
But Philip did the testing in ways I never thought. It is calculated by wrong frequency and entered directly.
The people who saw it in the BITX group succeeded in sending the WSPR according to Philip's method.

It looks like the problem has now been resolved.
The BPF problem was my mistake, and the frequency problem was the calibration problem.

As a result of applying Master Calibration already set in uBITX to new logic, we confirmed that WSPR is transmitted at the correct frequency.

The picture below shows the test pictures at 630M (474,200hz) and 10M (28,124,600Hz).






Before writing this article, Gerald saw the article I edited on my blog and made the test and it succeeded.

I think the WSPR implementation is not so difficult because there are already a lot of open source. I just apply the source code.
Rather, I think the test is more difficult. That's why I am so grateful to those who test me.

Please let me know your test result and I will check it on wsprnet.org and capture it.




Ian KD8CEC

2018-03-11 20:45 GMT+09:00 Philip <philip.g7jur@...>:

Hello Ian.

Is the WSPR frequency calculator in uBITX manager working correctly. Or is the uBITX transmitting on the wrong side band ?.
I would like test the update when you have done it.

Philip G7JUR



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

Re: U1 Question

fbeafore@...
 

Thanks Jerry. I will replace it.

Re: The issues of the TDA2822

N1AFF - formerly KB1JPW
 

Al,
I ordered mine on Jan 5th and powered it for the first time last night with one of the WX versions on-board.  I had about 5 mins of audio on 80 meters and then it went silent.  I've been able to power it on and everything else seems to work fine, just no audio. I get a little pop when turning on but that's it now.  I checked and there were no issues with any of the caps/resistors/radiuno, etc.  I'd say you're safe to go ahead and give it a shot.  I read and re-read all the instructions, looked at every picture I could find along with every post out there. I still had one blow.  I'm just counting this as part of the build experience where I get to learn to troubleshoot the circuits early in the game.  

Just make sure you've got everything plugged in all the way before powering on. Double check your wiring on the audio pot to make sure it's not flipped. With the headphones - do not plug in when powered on or pull out to be safe. 
I've tracked down a replacement ic for the TDA2822 already and have a 386 I'm going to breadboard in the meantime. 

Drew 
KB1JPW 

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

Guy N7BIR <sgbridge@...>
 

Thanks for all the suggestions Jerry. That should keep me busy for awhile and hopefully a solution will come out of it. Will keep you posted. 
Kind Regards,
Guy N7BIR  

Re: Please play well together

John Kemker
 

Back in the late 80s and early 90s, I was active on a BBS network called "FidoNet."  The creator of FidoNet had an interesting pair of rules:

1)  Do not be overly annoying.
2)  Do not be too easily annoyed.

We'd all do well to remember those in everyday life.
--

73 de W5NNH

Re: The issues of the TDA2822

Ashhar Farhan
 

Just to put thr record straight, once we figured out which batch was the problem, we did not proceed with it. We junked 500 of the remaining chips, tried many other sources and found good ones. 
That said, it did take us time to realize there was a problem. Unless somethinf emerges as a pattern, it becomes difficult to spot a production failure. We cannot halt production for jndividually reported problems.
To be on the safe side, we now subject every board to 14v to smoke out any potential problems.

On 13 Mar 2018 7:07 am, "KB1JPW" <a.fairaizl@...> wrote:
Al,
I ordered mine on Jan 5th and powered it for the first time last night with one of the WX versions on-board.  I had about 5 mins of audio on 80 meters and then it went silent.  I've been able to power it on and everything else seems to work fine, just no audio. I get a little pop when turning on but that's it now.  I checked and there were no issues with any of the caps/resistors/radiuno, etc.  I'd say you're safe to go ahead and give it a shot.  I read and re-read all the instructions, looked at every picture I could find along with every post out there. I still had one blow.  I'm just counting this as part of the build experience where I get to learn to troubleshoot the circuits early in the game.  

Just make sure you've got everything plugged in all the way before powering on. Double check your wiring on the audio pot to make sure it's not flipped. With the headphones - do not plug in when powered on or pull out to be safe. 
I've tracked down a replacement ic for the TDA2822 already and have a 386 I'm going to breadboard in the meantime. 

Drew 
KB1JPW 

Re: Complaint Department

Ashhar Farhan
 

The added advantage of using ptt as the straight key is that i can tune up the antenna without having to carry a key to the field. 
There is another issue that it will solve as well. It is as follows : the current display shows the zero beat frequency, not the frequency of the tuned signal. Putting in the CW mode will provide correct frequecy read out as well.
- f

On 13 Mar 2018 6:04 am, "Jerry Gaffke via Groups.Io" <jgaffke=yahoo.com@groups.io> wrote:
Posts 43954 and 43971 describe a couple minor firmware bugs.

On Mon, Mar 12, 2018 at 11:28 am, Jerry Gaffke wrote:
Now that you've said you are cooking up new firmware, I'm sure you will be deluged
with suggestions, and of course need to ignore most of them.  But here's mine:

Re: RD16HHF1 power curve flattening...some

Ashhar Farhan
 

A simple trick to buck the lower frequency gain is to use a low value capacitor in the emitter bypass of the predriver. The emitter will see a 100 ohms resistor at low frequncies and as the reactance of the emitter bypass falls with higher frequencies, the gain will increase.
- f

On 13 Mar 2018 12:10 am, "Tim Gorman" <tgorman2@...> wrote:
Nice work!

Sounds like I need to get some mpsh10's or equivalent.

tim ab0wr

On Sun, 11 Mar 2018 21:02:34 -0700
"Glenn" <glennp@...> wrote:

> I completed my mockup of the PA driver stages.
>
> as previous post:
>
> * used MPSH10's in all stages. 
> * Used FT37-43 toroids all wound with 10 turns 0.25mm wire either
> tri- or bi-filar according to original Sch.
> * Bypassed all emitter resistors with a 220pF cap.
> * swept from C80 input to T10 secondary (as wound)
>
> Result is a very flat response. Better than 1db from 3Mhz to 54MHz.
>
> glenn
> vk3pe




Re: Complaint Department

Jerry Gaffke
 

The freed up analog pin would be quite useful, I'm thinking SWR/PWR.
I'd guess most uBitx users don't use the internal iambic keyer, will be several sources of
firmware if they want it, perhaps using digital pins freed up by moving to an i2c display.
Or could use a cheap PIC uC iambic keyer to drive the ptt line.
For a basic SSB rig, straight key on ptt is plenty, ideally at the tip of the mike jack. 
This is coming from a guy who has spent much of his on-air time using CW.

Jerry, KE7ER


On Mon, Mar 12, 2018 at 07:22 pm, Ashhar Farhan wrote:
The added advantage of using ptt as the straight key is that i can tune up the antenna without having to carry a key to the field. 
There is another issue that it will solve as well. It is as follows : the current display shows the zero beat frequency, not the frequency of the tuned signal. Putting in the CW mode will provide correct frequecy read out as well.
- f

Re: Ubitx audio debug question

Tom Christian
 

I replaced U1 and it fixed the problem. 
The part I received today was a batch of ST Microelectronics TDA2822M chips from Juried Engineering on Amazon .

https://www.amazon.com/gp/product/B074BFS8F2/ref=oh_aui_detailpage_o08_s00?ie=UTF8&psc=1

Thanks for all the help!
Tom
AB7WT

Re: Micro BitX No Audio TDA2822?

Tom Christian
 

Ron, Replacing U1 fixed the problem.  I posted the chip details https://groups.io/g/BITX20/message/43594
Tom
Ab&WT

Re: CW Choppy

ohwenzelph
 

I think it’s a known issue, QRPGuys has a uBitx CW conditioner PCB for $4 shipped, you supply the parts
https://qrpguys.com/ubitx-cw-conditioning-adapter 

uBitx Manager for Mac?

Mike Lichtman
 

Is there a uBitx manager program available for the Mac OS? 73 Mike KF6KXG

Re: CW Choppy

K4LXY
 

Don
I haven't tried a straight key but with the original firmware, I was having problems with erratic keying when using a paddle.  Since upgrading to the KD8CEC I haven't noticed a problem.  
73 Howard K4LXY

Re: RD16HHF1 power curve flattening...some

Glenn
 

Hi Ashhar, this is precisely what i have done in the driver stages. Along with the MPSH10's.
glenn
vk3pe

Re: CW Choppy

Carlos E. Wenzel
 

Upgrade to KD8CEC firmware.
i use it and works perfectly
73 Carlos  IK2YRA

2018-03-13 7:32 GMT+01:00 DrZ <zehrhj2@...>:

Don
I haven't tried a straight key but with the original firmware, I was having problems with erratic keying when using a paddle.  Since upgrading to the KD8CEC I haven't noticed a problem.  
73 Howard K4LXY




--
Carlos Wenzel
ik2yra@...
+39-3284684518
Skype: IK2YRA

Re: uBitx Manager for Mac?

Karl Heinz Kremer, K5KHK
 

Last time I checked, it was just the Windows .exe, which can be made to work on LINUX with Mono. I tried Mono on my Mac, but it did not work. I also tried Wine. It does come up, but I have no idea how to get the USB port configured. 
--
Karl Heinz - K5KHK

Order

Fr Richard R <rickocr2005@...>
 

Ordered my uBITX on 19 Jan. Received my PayPal shipment order today.

Fr Richard