Date   
W0EB/W2CTX new I2C software for the uBITX Corrections

Jim Sheldon
 

Due to my fat-fingers, some bad code may have gotten into the original _00R release of our I2C modifications and software. Inadvertent use of the D13 I/O pin caused the radio to go into transmit immediately on power up. We had overlooked the fact that D13 is used on the Arduino Nano to control an on-board LED and needs special treatment to use it as a Digital input.

This has been corrected by moving off of D13 and shifting to D11 and D12 instead of D12 and 13.

To make it easier for everyone, I'm posting an updated zipfile that contains the corrected software and for those of you who have decided to try it, I have also included the required LiquidCrystal_I2C library necessary to get the code to compile properly -- Everything is included in the attached ubitx_I2C_V_1_01R.zip

For some reason my ISP is blocking emails from BITX20@groups.io so any questions please reply directly to @W0EB.

Jim Sheldon, W0EB

7 Pins, 8 Pins, What's a Pin Between Friends?

Arvo W0VRA
 

So I'm piddling away with the µB parts as I work out details for my case and stuff, and I can't get the audio connector on.  After an exhaustive investigation, I resort to counting.

The connectors on the board have eight pins, and the harnesses have seven holes.

I think I can make it work.

Re: Cheap Harbor Freight Case for MBITX

Christopher Miller
 

Quite a few cities have maker spaces now. You can for a nominal donation use all sorts of tools. 

Chris

Re: 7 Pins, 8 Pins, What's a Pin Between Friends?

Jerry Gaffke
 

My first run uBitx came with two 8 pin harnesses, plus a 3 and a 2, appropriately enough.
The Bitx40 had a 5 pin harness, but no 7 pin harness.
Wonder where some 7 pin headers slipped into the mix, perhaps the vendor to hfsignals?

Could be that a bunch of uBitx kits went out with the wrong harness.
If others wind up with 7 pin harnesses in their kit, here's how to deal with it:
Audio 8 pin connector into the uBitx main board can skip the ground at pin 8, plenty of other grounds.
Likewise, the Raduino 8 pin connector could do without A7 at pin 1, which is a "spare" in Farhan's code.
Have to shave off the plastic keying guide on one end of the harness connector,
note that it's a different end to be butchered on the two connectors.



On Tue, Jan 30, 2018 at 11:50 am, Arvo KD9HLC wrote:
So I'm piddling away with the µB parts as I work out details for my case and stuff, and I can't get the audio connector on.  After an exhaustive investigation, I resort to counting.

The connectors on the board have eight pins, and the harnesses have seven holes.

Re: uBitx audio potentiometer question.

Dennis Yancey <bigbluedry@...>
 

How would you expect a 250k audio taper pot work? I have a load of these from guitars and amp repair/build.

Re: uBitx audio potentiometer question.

Jerry Gaffke
 

I suppose you could try a 250k volume control pot, but it may not work very well.
The TDA2822M datasheet claims a minimum input impedance of 100k.
    


On Tue, Jan 30, 2018 at 12:30 pm, Dennis Yancey wrote:
How would you expect a 250k audio taper pot work? I have a load of these from guitars and amp repair/build.

Re: 7 Pins, 8 Pins, What's a Pin Between Friends?

Arvo W0VRA
 

I'm going to keep the colors the same as the wire up diagram, so I'll be using black to A on the encoder on one and black to the speaker ground on the other.  I'll add a violet from a spare for the mic.  The violet is not used on the Raduino socket.

And you make an interesting point, that the numbers from pin numbers 1-8 seem to be backward with respect to the colors.

Re: 7 Pins, 8 Pins, What's a Pin Between Friends?

Jerry Gaffke
 

Good idea to keep the colors consistent,
I had no clue what color scheme was chosen for your 7 pin harnesses.

I'll credit you with the point about colors being backward with respect to pin numbers,
as it hadn't occurred to me.  (For those that don't quite follow, the wire colors would
otherwise agree with the resistor color band code.)



On Tue, Jan 30, 2018 at 12:43 pm, Arvo KD9HLC wrote:
I'm going to keep the colors the same as the wire up diagram

Re: I did it again.. i plugged the arduino pins on reverse

César EA3IAV
 

Don’t worry. I will not make you read anymore. I thought It was clear what I explained. If you don’t understand something you may ask. Not to mention English is not my first language. But it is easier for you to make a compilation of my clumsiness. Radio works and receives but ptt is not working. No relais noise. No swiching.  Somehow despite of all connections seem to be good as i teaces continuity. That wire was the only execption I did to make sure there is a connection between that pins I described.

Re: uBITX woes, feeling disheartened. #ubitx

James Lawrie
 

Hello,

Who is the member of this group that has the bad uBitx with all the relay/other issues? Please contact me about your uBitx. I have a new in the box uBitx I might be will to swap for you damaged one, but I need to know what shape it’s in physically.

After all these posts you seem to be getting nowhere and I hate to see problems like this unresolved, no strings or catch I haven’t built mine and you could use it more than me at the moment.


James Lawrie

On Jan 30, 2018, at 13:18, K5ESS <k5ess.nothdurft@...> wrote:

The pin numbering on these relays is inconsistent  i.e. reversed in some cases. Either will work OK by taking this into consideration.

Mike

K5ESS

 

From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of David Beal
Sent: Tuesday, January 30, 2018 9:36 AM
To: BITX20@groups.io
Subject: Re: [BITX20] uBITX woes, feeling disheartened.

 

Hi Nick, 

I got the same relay and am equally confused as the pinout for both the original relay (Virtual) and this replacement (Panasonic) appears to be the same (across 1/16 on both pinouts); yet the schematic shows the coil across pin 8/9 per:  https://groups.io/g/BITX20/message/40439

Oddly, the data sheet for this relay which I posted here: https://groups.io/g/BITX20/message/40440  is no longer available.  
Further, this post:  https://groups.io/g/BITX20/message/26983  indicates coil across 1/16 also. 

I'm going to disconnect PA power this weekend and use an ohm meter to trace through the relays per someone else's suggestion.  

Dave


--
Dave Beal
AE6RQ

Re: 7 Pins, 8 Pins, What's a Pin Between Friends?

Doug W
 

To add another data point, my first run μBITX came 2 x 8 pin, 1 x 3 pin, 1 x 2 pin harnesses.

By running the pattern backwards does Violet regain her virtue?  (please apply apologies in advance if needed)

Message authorization

kk6gkradio@...
 

Greetings, will you allow me to send messages to the group?  I have a working BITX40 but could use some help in updating the firmware.
Thanks,
John Robertson

Re: I did it again.. i plugged the arduino pins on reverse

Arvo W0VRA
 

On Tue, Jan 30, 2018 at 01:10 pm, César EA3IAV wrote:
If you don’t understand something you may ask. Not to mention English is not my first language. But it is easier for you to make a compilation of my clumsiness.
Jerry is asking, and he's not making a compilation of your clumsiness.  He is, however, making a compilation of all the issues you have had with the radio to get a thorough understanding of what might be causing the trouble.

The situation is complicated and the symptoms you describe are confusing.  Blowing a regulator on the Raduino is very odd.  Losing the connection between the 3V3 and C1 on the Raduino board is also very odd.

Re: uBITX woes, feeling disheartened. #ubitx

César EA3IAV
 

I may want the raduino board James ...

Re: Message authorization

M Garza <mgarza896@...>
 

Here is a link to Allard's software.
 The instructions are on that page.

Marco - KG5PRT 

On Jan 30, 2018 3:24 PM, "john robertson" <kk6gkradio@...> wrote:
Greetings, will you allow me to send messages to the group?  I have a working BITX40 but could use some help in updating the firmware.
Thanks,
John Robertson

Re: Message authorization

Arv Evans
 

John

I could join you to the group but would not know the configuration you might
want for the subscription.  It would be better if you were to go to the group
site and do your own subscription.  There you can fill in your email, message
preferences, etc. 

  https://groups.io/g/BITX20

  https://groups.io/g/BITX20/editsub

Arv  K7HKL
_._


On Tue, Jan 30, 2018 at 2:24 PM, john robertson <kk6gkradio@...> wrote:
Greetings, will you allow me to send messages to the group?  I have a working BITX40 but could use some help in updating the firmware.
Thanks,
John Robertson


Re: IRF510 amplifier failures

William Kimber
 


What many people fail to realise when using a diode bridge for reverse polarity protection is it means neither of the power wires are at ground potential.  If used in vehicle with battery having one terminal grounded the grounds are not at same potential.  So your metal case and vehicle body have a diode drop difference.


Cheers,

Will

ZL1TAO


On 31/01/18 06:05, Jerry Gaffke via Groups.Io wrote:
<SNIP>
Reverse DC is not a problem for the IRF510.  It has an intrinsic reverse diode from source to drain,
will blow the traces or coils between it and the power supply.  Or, with some foresight, the fuse
you put into that power supply lead.  Where you need reverse protection is going into the remainder
of the board, be it Bitx40 or uBitx.  A 1n4148 diode would suffice, a 1n400x would not get quite so hot,
but there is no problem with running all that stuff at 0.7 volts less.  

Having a full wave rectifier in line with the power supply to the IRF510's would reduce the voltage
there by 1.4 volts.  And have a significant hit on output power available.

<SNIP>
On Tue, Jan 30, 2018 at 04:54 am, John Brock wrote:

I have not received my uBitx yet. I’ve been  reading this forum for about two weeks. Looks like PA failures is a huge problem.

Are the two main causes reverse DC power and high SWR?

For the DC polarity problem how about a full wave rectifier at the DC input? Two diode voltage drop a problem with this approach?

What would be the best way to limit PA  power out to a very small value to allow a manual tuner to be used for the SWR issue?

 


Re: I did it again.. i plugged the arduino pins on reverse

Jerry Gaffke
 

I can deal with the language barrier.
Podemos emplear espanol si quieres, pero no he practicar lo unos veinte anos.

You do have to describe what is going on in detail if we are to fix this through forum posts.
Otherwise you will have to find somebody there to help you in person.
But I think I understand your situation now.


You have a uBitx, the only complaint remaining is that when you press the PTT switch
it does not go into transmit mode.  No clicking from the relays. 
I assume the uBitx continues to receive with PTT pressed.


Check these points of the uBitx with a voltmeter, measuring voltages to ground:

When you press the PTT switch, the orange wire into pin 5 of the 8 pin connector into the Raduino
should go from high (about 5v) to low (about 0 volts).
    http://www.hfsignals.com/index.php/ubitx-wire-up/

The Nano on the Raduino sees that low from the PTT switch and responds 
by driving the T/R pin high into the uBitx main board.
The voltage at the top of C150 as seen in the lower left of the uBitx schematic goes from 0 volts to around 5 volts:
Here's the uBitx schematic:
    http://www.hfsignals.com/wp-content/uploads/2017/12/ubitxv3.pdf

The 5 volts at signal T/R turns on transistor Q15, which will make pin 9 of relay K1 go from 12 volts down to near 0 volts.
With the coil of relay K1 now energized, K1 pin 3 should go from 12 volts to zero volts to remove power from the receive circuits
and K1 pin 5 should go from zero volts to 12 volts to power the transmit circuits.

The pin numbering of the relays is kind of funny, it is numbered as if it has 16 pins,
but some of the pins are missing.  Here's the view from the bottom of the board.
Pin 1 has a square pad:

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

Best Regards,
Jerry,  KE7ER



On Tue, Jan 30, 2018 at 01:10 pm, César EA3IAV wrote:
Don’t worry. I will not make you read anymore. I thought It was clear what I explained. If you don’t understand something you may ask. Not to mention English is not my first language. But it is easier for you to make a compilation of my clumsiness. Radio works and receives but ptt is not working. No relais noise. No swiching.  Somehow despite of all connections seem to be good as i teaces continuity. That wire was the only execption I did to make sure there is a connection between that pins I described.

New case found

Richard E Neese
 

Re: New case found

Richard E Neese