Date   
Re: ubitx v5 down: IRF510 heatsink very hot immediately after turning on the radio #ubitx-help #ubitx

Jens Kaemmerer
 

Hi Jerry,

I have now been able to start with the 'noise injection' test:

I first connected the wire to TP21 and could hear noise increase
(VOL set to high). This was not much of a surprise because I
had already established that the LM386 is working.

Then I connected the wire to TP20 (output of the de-modulator?)
and found that I could not hear any difference in noise level.

If I read the uBitx v5 schematic correctly, this could mean that
the Q70 transistor (type 2N3904) or the relay K3 might be damaged.
I assume Q70 acts as an audio pre-amplifier(?).

I continued by measuring continuity between C51 (M1) and TP21 (M2)

with the uBitx turned off: continuity exists (expected)
with the uBitx turned on: continuity does not exist (?) (not expected)

I expected that continuity continues to exist when the uBitx is
turned on.

Also:

with the uBitx turned on *or* off:
continuity exists between TP8 (TX path) and ANT (antenna center conductor)
and TP1/TP2 and ANT

This is strange - based on the schematic it should be:

Either there is continuity between TP1/TP2 and ANT *or* TP8 and ANT - not
simultaneously.

My conclusion:
Maybe the relay K3 is damaged (or somehow 'stuck').

I was almost ready to send this email when I tried one more thing ...

I noticed in the past that a relay in the uBitx rapidly switches back and forth
when I startup the radio *and* have the  MIC cable (coming from the
soundcard) already plugged in.

So I figured, if the relay is 'stuck' - maybe I can 'free' it by plugging
the MIC cable in again and force the rapid back and forth switching.

Bingo - it worked, RX is working again.

Next up: fixing TX ... (don't have time for this today as this will require some surgery ...)

I am very thankful for everybodies help in this endeavor,

-jens (KM6ZJV)




Re: ubitx v5 down: IRF510 heatsink very hot immediately after turning on the radio #ubitx-help #ubitx

Jerry Gaffke
 

Jens,

That's great progress, you know about where the problem is.
Sounds like the rig is powering up in transmit mode, not good, you need to follow up on this.
I suggest you triple check that you have the 4.7k resistor installed properly at the keyer jack:
    http://www.hfsignals.com/index.php/ubitx-wire-up/
No idea why plugging in the mike.

Verify that when powering up the rig (with or without a mike) that a voltmeter sees 12 volts to ground on
the TX node, and zero volts to ground on the RX node.

When powering up the rig, relay K1 supplies 12v to the RX node to activate the receiver circuits
the TX node should be 0 volts when receiving.
When pressing PTT or when using the morse key (or when the morse key does not have the 4.7k resistor),
the rig will go into transmit with TX at 12v and RX at ground.

Going back a bit further, relay K1 is activated for transmit by the T/R node going into R150 at Q15.
The node TR should be zero volts when receiving, around 5v when transmitting.

Yes, Q70 is the audio pre-amp, only used during receive.

Jerry, KE7ER


On Sun, Apr 21, 2019 at 11:15 AM, Jens Kaemmerer wrote:
So I figured, if the relay is 'stuck' - maybe I can 'free' it by plugging
the MIC cable in again and force the rapid back and forth switching.

Bingo - it worked, RX is working again.

Re: Audio AVC

Jim Tibbits
 

If you're speaking about the circuit I posted, the jfet (j310) is a depletion mode jfet ie. normally ON ...at zero bias on the gate, about .1 ma is flowing (voltage between source and drain = .004 volts),  negative going voltage at the gate turns it OFF (gradually) ie the tranconductance curve is a lot more 'sloped' than that of the 2n7000 mosfet (on/off at about +2.2 volts)

As the jfet is conducting signal passes thru ..(no attenuation) as signal increases, gate voltage decreases (goes minus) turning the jfet off increasing the resistance from drain to source attenuating the input signal

Diodes comprise a Negative Voltage Doubler...22 Uf cap governs attack time 100k resistor governs decay time

Re: Audio AVC

Jim Tibbits
 

A hack for am recieve

1) disable 12 Mhz CLK 0 ...Software would be best but ...I terminated it into 50 ohms at the raduino...Works but not ideal

2) hooked this circuit to junction of R114/R115 ...


instead of at C222-1 ...

Gets am,  Volume won't knock your socks off (need more gain as at that point rf is about 5/10 mV p-p but )...
10 mhz WWV (usb=9,996,000)(lsb=(10,002,800) or so ...

Re: uBitX For Sale #ubitx

SC <bill@...>
 

This radio kit and case are SOLD.  Thank you for your interest.  It is going to a good home.  Bill, WB4ME

Re: Menu Sequence for CEC Firmware v1.200 #ubitx #firmware

Dan Pflugrath
 

Thank You John (vk2eta),  I edited the define statements in the ubitx_menu.ino file per your suggestion, it compiled, uploaded and ran perfectly.  I reordered about half of the define statements to make it easier to use with CW for SOTA.  I made RIT the first menu item so with a double click I turn it on or off.  Next is MEMTOVFO to make quick band changes and then the MODE to switch between CWU and SSB followed by VFO_TOGGLE, BAND, and CW_SPEED. 
That takes care of my new Version 5.  Now on to my Version 3 which I think uses case statements which should be easy to figure out.
 
Best Regards,
73 Dan KA7GPP

Re: More Nextion 3.5" tweaks to do

Joe Puma
 

I’m in the editor.

 

This code in tm0 will adjust the white lies, red line and black boarder for each band.  I’m programming it for a 5” screen so we’re working with 800x480 resulution. All the numbers are pixel positions except for the ending number which is a color by number or word.

 

 

//BAND1

  draw 0,30,610,80,WHITE

  fill 1,31,608,48,BLACK

  line 2,45,609,45,31727

  line 2,55,609,55,RED

  line 2,65,609,65,31727

  //BAND2

  draw 0,130,610,180,WHITE

  fill 1,131,608,48,BLACK

  line 2,145,609,145,31727

  line 2,155,609,155,RED

  line 2,165,609,165,31727

  //BAND3

  draw 0,240,610,290,WHITE

  fill 1,241,608,48,BLACK

  line 2,255,609,255,31727

  line 2,265,609,265,RED

  line 2,275,609,275,31727

 

 

 

 

 

 

Sent from Mail for Windows 10

 

From: Sam Tedesco
Sent: Sunday, April 21, 2019 11:09 AM
To: BITX20@groups.io
Subject: Re: [BITX20] More Nextion 3.5" tweaks to do

 

Fill command is fill x,y,w,h. So, if you want to draw a WHITE box across the 'black canvas' just to the spot where your controls are on the right hand side (h0,etc.), you could use

fill 0,184,409,5,WHITE    (the 409 is 480 - 71 (my control width of h0)).





 

Re: Raduino reinforcement, 3d printed

Laurence Oberman
 

Staples does this now

On Sun, Apr 21, 2019 at 1:12 PM Joel Caulkins/N6ALT <@caulktel> wrote:

I need one of these printed in Black, anybody know where I could get this done?

Joel
N6ALT

Re: Menu Sequence for CEC Firmware v1.200 #ubitx #firmware

John (vk2eta)
 

Glad you got it to work Dan.

That's the beauty of the rig, being able to customize it to your application.

Just a question, why not load the latest software on your V3 rig (maybe you made some modifications of the firmware)?

73, John

Re: ubitx v5 down: IRF510 heatsink very hot immediately after turning on the radio #ubitx-he llp #ubitx-he #ubitx

Jerry Gaffke
 

K3 could be just fine.

With power off, the relays are in their receive position as shown the the schematic.
The antenna is grounded for your DC ohmmeter by way of T2, via L4,3,2,1, K1 and K2

As per my previous post, my guess is that when you power up it immediately goes into transmit mode.
Now the antenna is grounded by way of T11, via KA1,2,3, L11,12,13 and K3.
In either case, all of TP1, TP2, TP8 and the antenna are DC grounded.
That would be true of a perfectly functioning rig, except it should not power up in transmit mode.

I'm guessing a miswire or two in following the hfsignals ubitx wireup instructions.
Perhaps in that 4.7k resistor that should be on the morse key line.
And perhaps also somehow in how the mike got wired up, such that plugging in the mike
somehow brings it back to receive.
 


On Sun, Apr 21, 2019 at 11:15 AM, Jens Kaemmerer wrote:
Also:

with the uBitx turned on *or* off:
continuity exists between TP8 (TX path) and ANT (antenna center conductor)
and TP1/TP2 and ANT

This is strange - based on the schematic it should be:

Either there is continuity between TP1/TP2 and ANT *or* TP8 and ANT - not
simultaneously.

My conclusion:
Maybe the relay K3 is damaged (or somehow 'stuck').

Re: ubitx v5 down: IRF510 heatsink very hot immediately after turning on the radio #ubitx-he llp #ubitx-he #ubitx

Adrian Chadd
 

Hi,

If you disconnect the raduino and power up, does it still go into TX mode? (Just to rule out something on the raduino side holding the TX line high.)



-adrian

Re: 18000km

knightsbdh@...
 

Hi Ron

Fascinating and well done. I am still in the process of setting up my uBitx (got to tick off some other projects first), so it's always interesting to read about what this little thing can do.

Cheers
Ben
ZS6BDK

Re: Raduino reinforcement, 3d printed

Tom Clifton
 

3D printing has become a home closet industry.  Google terms such as" Who can print my 3D close to me" and you should be able to find a number of folks to get quotes from.  All you need to do is provide the .stl file.  Prices may be all over the ballpark so don't be surprised at the answers.  Pricing will probably be based on a one time setup, cost of material per gram (perhaps $0.05) and a cost per minute or hour for printer time (perhaps $1 or $2 per hour expressed in hours and minutes)  3D printing is not fast...

Another thing to consider is going down the 3D rabbit hole.  An Ender3 is under $200, and filament is $20 per Kg roll of PLA+

I finally took the leap a month ago and wonder why I waited so long.  I found a local (to me) Facebook Group for support.  Yes there is a bit of a learning curve, but once you get familiar with operation and the tons of .stl models available (free!) on thingiverse you will probably want to start creating your own models.  There are a number of free modeling packages with different capabilities (learning curve) but youtube is loaded with excellent tutorials.

Re: 18000km

_Dave_ K0MBT
 

10000 miles Excellent. I got a ssb contact with a Australian ham on phone a couple of weeks ago.

I wonder if the yahoos with amps are still going to be going strong when the bands come back.

Re: 18000km

Laurence Oberman
 

Yep, with CW or JT65 (with error correction) you can do a lot with a
very little.
Great job
Congrats

On Mon, Apr 22, 2019 at 8:22 AM d balfour <davesters@...> wrote:

10000 miles Excellent. I got a ssb contact with a Australian ham on phone a couple of weeks ago.

I wonder if the yahoos with amps are still going to be going strong when the bands come back.


Re: Raduino reinforcement, 3d printed

Ted
 

A couple of the public libraries around me have 3D printing ability listed as services available at nominal cost. 

I have yet to try them though I have 2 TFT bezels to obtain sooner or later.  You might see if your local public library system hosts this capability as well 


Ted
K3RTA



Re: Raduino reinforcement, 3d printed

Terry Morris
 

Thanks for this information Tom.

Terry - KB8AMZ
Brimfield Twp, OH USA EN91hd
Linux User# 412308, Ubuntu User# 34905, PCARS#78, NAQCC#6668, QRP-ARCI#8855, SKCC#14195


On Mon, Apr 22, 2019 at 7:58 AM Tom Clifton via Groups.Io <kc0vsj=yahoo.com@groups.io> wrote:
3D printing has become a home closet industry.  Google terms such as" Who can print my 3D close to me" and you should be able to find a number of folks to get quotes from.  All you need to do is provide the .stl file.  Prices may be all over the ballpark so don't be surprised at the answers.  Pricing will probably be based on a one time setup, cost of material per gram (perhaps $0.05) and a cost per minute or hour for printer time (perhaps $1 or $2 per hour expressed in hours and minutes)  3D printing is not fast...

Another thing to consider is going down the 3D rabbit hole.  An Ender3 is under $200, and filament is $20 per Kg roll of PLA+

I finally took the leap a month ago and wonder why I waited so long.  I found a local (to me) Facebook Group for support.  Yes there is a bit of a learning curve, but once you get familiar with operation and the tons of .stl models available (free!) on thingiverse you will probably want to start creating your own models.  There are a number of free modeling packages with different capabilities (learning curve) but youtube is loaded with excellent tutorials.

Re: Raduino reinforcement, 3d printed

Jim Sheldon
 

Tom's absolutely right about the 3D rabbit hole.  Be careful if you do though, These buggers can be extremely addictive!  Fortunately I have family support (my wife likes the Rose & Stem (stole it from Thingiverse) I printed for her shortly after she bought me one for my recent birthday.  It had a rather small print volume though (4.9" cube) so I spent another $217 on an Ender 3 with the glass (non-warping) bed as a second printer for the bigger stuff.

I don't have any black filament right now or I would have volunteered to print that for you.  Also they same guy that sells the little AGC board does them too and since he's doing them commercially and graciously sent me the .stl file I didn't want to encroach on his business.

Jim - W0EB

------ Original Message ------
From: "Terry Morris" <terry.kb8amz@...>
Sent: 4/22/2019 8:48:07 AM
Subject: Re: [BITX20] Raduino reinforcement, 3d printed

Thanks for this information Tom.

Terry - KB8AMZ
Brimfield Twp, OH USA EN91hd
Linux User# 412308, Ubuntu User# 34905, PCARS#78, NAQCC#6668, QRP-ARCI#8855, SKCC#14195


On Mon, Apr 22, 2019 at 7:58 AM Tom Clifton via Groups.Io <kc0vsj=yahoo.com@groups.io> wrote:
3D printing has become a home closet industry.  Google terms such as" Who can print my 3D close to me" and you should be able to find a number of folks to get quotes from.  All you need to do is provide the .stl file.  Prices may be all over the ballpark so don't be surprised at the answers.  Pricing will probably be based on a one time setup, cost of material per gram (perhaps $0.05) and a cost per minute or hour for printer time (perhaps $1 or $2 per hour expressed in hours and minutes)  3D printing is not fast...

Another thing to consider is going down the 3D rabbit hole.  An Ender3 is under $200, and filament is $20 per Kg roll of PLA+

I finally took the leap a month ago and wonder why I waited so long.  I found a local (to me) Facebook Group for support.  Yes there is a bit of a learning curve, but once you get familiar with operation and the tons of .stl models available (free!) on thingiverse you will probably want to start creating your own models.  There are a number of free modeling packages with different capabilities (learning curve) but youtube is loaded with excellent tutorials.

Re: ubitx v5 down: IRF510 heatsink very hot immediately after turning on the radio #ubitx-help #ubitx

 

The electrical path both will show 0 to ground  as they are connected to it through
inductors or toroids to ground.

TP1 is ground connected through a toroid.


At 21-04-19, you wrote:
Hi Jerry,

I have now been able to start with the 'noise injection' test:

I first connected the wire to TP21 and could hear noise increase
(VOL set to high). This was not much of a surprise because I
had already established that the LM386 is working.

Then I connected the wire to TP20 (output of the de-modulator?)
and found that I could not hear any difference in noise level.

If I read the uBitx v5 schematic correctly, this could mean that
the Q70 transistor (type 2N3904) or the relay K3 might be damaged.
I assume Q70 acts as an audio pre-amplifier(?).

I continued by measuring continuity between C51 (M1) and TP21 (M2)

with the uBitx turned off: continuity exists (expected)
with the uBitx turned on: continuity does not exist (?) (not expected)

I expected that continuity continues to exist when the uBitx is
turned on.

Also:

with the uBitx turned on *or* off:
continuity exists between TP8 (TX path) and ANT (antenna center conductor)
and TP1/TP2 and ANT

This is strange - based on the schematic it should be:

Either there is continuity between TP1/TP2 and ANT *or* TP8 and ANT - not
simultaneously.

My conclusion:
Maybe the relay K3 is damaged (or somehow 'stuck').

I was almost ready to send this email when I tried one more thing ...

I noticed in the past that a relay in the uBitx rapidly switches back and forth
when I startup the radio *and* have the  MIC cable (coming from the
soundcard) already plugged in.

So I figured, if the relay is 'stuck' - maybe I can 'free' it by plugging
the MIC cable in again and force the rapid back and forth switching.

Bingo - it worked, RX is working again.

Next up: fixing TX ... (don't have time for this today as this will require some surgery ...)

I am very thankful for everybodies help in this endeavor,

-jens (KM6ZJV)

Re: ubitx v5 down: IRF510 heatsink very hot immediately after turning on the radio #ubitx-help #ubitx

Philip
 

Is the cat alright.
Philip.