Date   

Re: v6.1 alignment

Mitchel Rought
 

yes I did the alignment and it worked out fine, receiving very well, now just no output power on cw or ssb


Re: v6.1 alignment

Evan Hand
 

Mitchel,
I am asking about the original post from you that said you were having issues with receiving.  My post to that was to point you to the Frequency Calibration video by Ashhar Farhan.  The next few emails have been about voltage checks.  I am not sure how we got there.

Please verify what the current issue is with the rig, and verify that you did try the calibration process that Ashhar Farhan outlined in the video.  Here is the link again:
https://www.youtube.com/watch?v=t6LGXhS4_O8

And here is the message that I had sent:
https://groups.io/g/BITX20/message/82181

73
Evan
AC9TU


First HF radio..incensed a week ago...I think I blew up my uBitXv4.

allenphundley@...
 

I think I must have busted the arduino? I went through it a few more times with a muktimeter. Every thing seems in order.

I thought it might be the Arduino. So I updated the firmware on it expectj g that to fail. It worked and even fixed my problem with the key.

Now I only have one problem. Now the rotary encoder doesnt work! The push button does, but not the rotation. Super weird. I ordered 3 more arduino nanos.

Any thing else jump out at you?

On Sep 25, 2020, at 3:30 PM, Evan Hand <elhandjr@...> wrote:
My first thought is to check the mic and key connections.  I have had similar issues with 3.5mm plugs that being pushed in all the way.  One of my key paddles has that issue, and I must constantly check that it is pushed in all the way.

I would verify the operation of the key input.  That is the line that needs the 4.7kohm resistor.  Check with a voltmeter after connecting a dummy load, or disconnecting the power to the power amp finals (the middle connector, brown wire, on the 3 pin header on the main board).

Did you by chance get one of the AmatuerRadioKits cases?  If so, I would verify the soldering on the front PCB, making sure that all of the 3.5mm jacks are soldered correctly, and no shorts.  You will also need another 3 pin header plug to separate the PA power, as the instructions for that case has you connect them together at the back PCB.

In any case, I think that you have a wiring issue that you need to resolve.  With the situation that you describe, even a short blip on the transmit key can cause the Nano to lock up due to RF feedback when you do not have a matched load.  Before breaking out the scope, I would attach a dummy load and verify that it operates properly. 

A good 20 watt low-cost dummy load can be ordered from QRP-Labs for $8.50 plus shippling.  Alternates can be had from Amazon, though without the power breakout circuit.
https://smile.amazon.com/Mcbazel-Surecom-0014-0153-PL259-1-0GHz/dp/B07MH6WPZL/ref=sr_1_12_sspa?dchild=1&keywords=qp+50+ohm+dummy+load&qid=1601068560&sr=8-12-spons&psc=1&smid=A263LSCPZJCHO0&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUFNVFBaN1dGWk1aNzEmZW5jcnlwdGVkSWQ9QTA0NTU4MjgzVVFLVFNaQjZNWExSJmVuY3J5cHRlZEFkSWQ9QTAzMjY5MjkzSlFaSlpRQUdGU0xNJndpZGdldE5hbWU9c3BfbXRmJmFjdGlvbj1jbGlja1JlZGlyZWN0JmRvTm90TG9nQ2xpY2s9dHJ1ZQ==

Hope this helps.
73
Evan
AC9TU


Re: v6.1 alignment

Mitchel Rought
 

Evan
all the voltage checks including U2 were fine
drains on irf510  11.94 vdc
I preset the pa bias full cw
mamp readings standby .333, mic keyed .560, after both adj .760
?

     


Re: v6.1 alignment

Evan Hand
 

Mitchel,

So how did the recalibration go?  That is my first point of improving reception on the uBITX.

73
Evan
AC9TU


Re: First HF radio..incensed a week ago...I think I blew up my uBitXv4.

Evan Hand
 

My first thought is to check the mic and key connections.  I have had similar issues with 3.5mm plugs that being pushed in all the way.  One of my key paddles has that issue, and I must constantly check that it is pushed in all the way.

I would verify the operation of the key input.  That is the line that needs the 4.7kohm resistor.  Check with a voltmeter after connecting a dummy load, or disconnecting the power to the power amp finals (the middle connector, brown wire, on the 3 pin header on the main board).

Did you by chance get one of the AmatuerRadioKits cases?  If so, I would verify the soldering on the front PCB, making sure that all of the 3.5mm jacks are soldered correctly, and no shorts.  You will also need another 3 pin header plug to separate the PA power, as the instructions for that case has you connect them together at the back PCB.

In any case, I think that you have a wiring issue that you need to resolve.  With the situation that you describe, even a short blip on the transmit key can cause the Nano to lock up due to RF feedback when you do not have a matched load.  Before breaking out the scope, I would attach a dummy load and verify that it operates properly. 

A good 20 watt low-cost dummy load can be ordered from QRP-Labs for $8.50 plus shippling.  Alternates can be had from Amazon, though without the power breakout circuit.
https://smile.amazon.com/Mcbazel-Surecom-0014-0153-PL259-1-0GHz/dp/B07MH6WPZL/ref=sr_1_12_sspa?dchild=1&keywords=qp+50+ohm+dummy+load&qid=1601068560&sr=8-12-spons&psc=1&smid=A263LSCPZJCHO0&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUFNVFBaN1dGWk1aNzEmZW5jcnlwdGVkSWQ9QTA0NTU4MjgzVVFLVFNaQjZNWExSJmVuY3J5cHRlZEFkSWQ9QTAzMjY5MjkzSlFaSlpRQUdGU0xNJndpZGdldE5hbWU9c3BfbXRmJmFjdGlvbj1jbGlja1JlZGlyZWN0JmRvTm90TG9nQ2xpY2s9dHJ1ZQ==

Hope this helps.
73
Evan
AC9TU


First HF radio..incensed a week ago...I think I blew up my uBitXv4.

Allen Hundley <allenphundley@...>
 

I was only interested in this hobby as a way to communicate with Baofengs during hunting, etc. Well I had a few spare dollars and ordered a uBitX v4 off eBay.

Last night I wired it all up and listened...didn't have an antenna just a piece of wire. It worked all right. I tried to turn up the volume to listen to a feint signal, turned it back down...all was well.

Then I went to go use it this morning and it instantaneously started transmitting. The MOSFETS in the back got hot rapidly and I turned them off.

Well, I noticed that if I removed the harness on the display/arduino that it would work again. I then isolated that behavior to a 4.7k resistor that is explicitly required in the instructions to prevent this exact phenomenon from happening. I tested continuity and resistance...it was fine. I unsoldered it and the radio appeared to work. I replaced the resistor. Same problem.

I left it unsoldered and attempted to listen. It was then that I noticed the rotary encoder was behaving strangely. The arduino clearly was recognizing something, but something was messing with the signal.

Before I break out the oscilloscope, I was wondering if someone could point me in the right direction. Thanks!


Re: v6.1 alignment

Mitchel Rought
 

update- re-positioned the negative lead position and Q70 reads normal as do all other voltage checks


Re: v6.1 alignment

Mitchel Rought
 

Evan
went through the voltage checks and one thing I noticed on the spreadsheet is that Q10-Q42 T and R seem to be reversed
Q70 voltage check  collector 1.73v,  base.832v,  emitter .155v
thanks


Re: Calibration again with V1.2 firm and Nextion

 

Hi Rene,

A simple crystal oscillator will rarely oscillate at the frequency marked on the crystal.  In order to do that, the circuit would have to provide the exact needed parallel or series capacitance as specified by the crystal maker.  So, usually after making a crystal oscillator, it will need to be calibrated.  Also, a crystal may easily be 250Hz off naturally just depending on the ppm specification of the crystal.  For example many crystals are specified as 20ppm accurate.  That is 20 parts per million.  So:

12.355MHz x 20  =  +/- 247.1Hz

73,  Mark


Re: Calibration again with V1.2 firm and Nextion

Adam Allen
 

I can tell you my procedure to align the v6 Ubitx with Nextion and CEC firmware.  I hook up an antenna and tune to WWV at 10.000mHz on USB. 

Go to the menu and turn Setup to ON.

Go to the Calibrate Frequency setting in the menu. 
It will start at zero and you’ll want to turn the tuning dial until the tone you’re hearing gets lower and lower, and just about goes away. If you tune too far you’ll hear that tone start getting higher and higher again.   The point where it almost goes away is Zero Beat.  

(Note: WWV also plays an audible tone at certain intervals, I can’t recall what they are, so make sure you’re hearing their CARRIER tone and not the audible tone they play at the top of certain minute intervals. A second receiver will help you do this calibrating while avoiding the audible tone they transmit) 

One you have ZERO BEAT, press the Push-to-Talk button on the mic.  

Turn off Ubitx and turn back on.  

Tune to a easy to copy QSO In progress. This is where a second receiver is handy to find one. 


Go back to the menu and turn Setup to ON again. 

Go to BFO CALIBRATE In the menu. 

Adjust the displayed frequency up or down until the voices of those having a QSO sound human. My experience is that it takes adjusting up a lot. I can’t recall off hand what a good frequency starting point is, but I want to say it’s around 11.056?? This is the BFO frequency you’re adjusting, not the actual frequency you’re tuned to on the Ubitx.  


Once the voices sound human press the Push-to-Talk again and turn the Ubitx off and back on   


That should get you really close. You can easily adjust the BFO further if you’re not liking the sound.  But be aware,  if you go to the Frequency Calibrate setting again it ALWAYS goes back to zero. It does not start at what you were previously at, like the BFO does.

 


Re: Just placed my order for the full kit today.

Support HF Signal
 

Hello Randy,

We usually ship the order in 2-3 days and it should reach you anywhere between 3 to 7 days.

BTW you order has already been shipped.

Hope that helps.

Thomas

On Fri, 25 Sep 2020 at 05:21, Randy.AB9GO <randy.ab9go@...> wrote:
How long is it taking from placing an order to the package arriving in the United States lately?

Thanks
randy.ab9go@...

This message sent to you from my mobile device via speech-to-text technology.



--
Support@HFSignals


--
Support@...


Re: Just placed my order for the full kit today.

Randy.AB9GO
 

DHL must be enlisting Santa and his reindeer has a subcontractor.  2 days from India with all the covid 19 issues is phenomenal.

randy.ab9go@...



This message sent to you from my mobile device via speech-to-text technology.


Re: great, cheap desoldering tool

bentukker@...
 

Tnx, just order one from a Dutch supplier


Re: great, cheap desoldering tool

Ian Reeve
 

Bought one from another supplier,does the job but electrically unsafe.Twin mains lead,no earth and wires are just twisted together before being clamped.Yes I would give it only one star on safety grounds.


From: BITX20@groups.io <BITX20@groups.io> on behalf of Roy Appleton <twelveoclockhigh@...>
Sent: Thursday, September 24, 2020 9:53:24 PM
To: BITX20@groups.io <BITX20@groups.io>
Subject: Re: [BITX20] great, cheap desoldering tool
 
Looking at the 1 and 2 star reviews of ZD-915 I wouldn't buy it!

Roy
WA0YMH



On Thu, Sep 24, 2020, 1:03 PM Mark M <junquemaile@...> wrote:
Amazon has them in stock (the ZD-915)...same price but free shipping (with Prime).


Re: Display question #firmware

Rene
 

Okay David, now in English, i bought mine on Ali, original Nextion 2.8 for 16 dollars, sometimes you find a cheaper 1. I have installed it and its great. Only problem is that after making an christal ocillator, the radio is about 250 hz out of line. I find i difficult to change some freq's on the uBit manager, but that is cause of my bad English. So maybe better before install the Nextion, to line out the radio until you think its perfect.
Regards,
Rene
Netherlands


Re: Calibration again with V1.2 firm and Nextion

Rene
 

Okay and thanks for thinking with me, and yes i did that before without the Nextion. So maybe i have to put the old screen back and line out again and after that putting the Nextion and firmware on the uBitx.
But it has to be possible with the ubitx manager....but i have problems to unerstand the whole program cause of my bad English. But thanks again.
Regards,
Rene
Netherlands


Re: 100W Automatic Antenna Tuner...

Robert Freeman
 

I bit on the recommendation at the beginning of this thread.  Have just finished construction.  I found a lot of details on Github by reading through the most recent and historical versions.  Most recent suggests a different transformer ratio for QRP, which I am going with.  The display I got has a different IIC address than what is configured in the EE memory.  Also bit off on a pickkit4, thinking it would be handy for programming PIC and Atmel chips.  Have found the MPLAP X IDE to be several notches above my ability.  Lots of options, More than I can get my head around.  Does anyone know, or can someone point me in the right direction to just update the ee memory values using mplab x ide and pickkit4?  I have tried dragging in the .H files and .C files from the firmware on github. Lots of errors and no build.  I can pull in the hex file, and can see the ee memory table, but have had no luck on writing out new values to the ee memory.  Would welcome any pointers. Also, I got my kit from the op in Russia, RA0SMS.  Slow shipping (expected and noted), but arrived in good shape and all parts intact. Idling, the board is drawing 60 mA.  Getting pumped to tune something. Has been educational, and some thoughtful work has gone into the design and kit.  Will be a nice complement to the BITX for me.
73's,
Robert,NQ0T


Re: Display question #firmware

David KK7SS <d3j452@...>
 

On Thu, Sep 24, 2020 at 04:44 PM, Evan Hand wrote:
ASIN B07Q36RBV2
Evan,

Thank you very much.
I'll order tomorrow  :-)
 
--
Dave KK7SS


Re: Just placed my order for the full kit today.

Curt
 

Randy

We are blessed by international commerce and the world wide community of builders. Customs can be the uncertainty.  hang in there if its more than a few days. Its a big world with current challenges.

73 curt

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