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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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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: More Nextion 3.5" tweaks to do

Joe Puma
 

Thanks Sam. I’ll try this out today. 


On Apr 21, 2019, at 11:09 AM, Sam Tedesco <stedesco619@...> wrote:

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

 

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

Joel
N6ALT


Re: uBitX For Sale #ubitx

SC <bill@...>
 

I am dropping the price to $120, plus shipping, which includes insurance.  If no one wants it at this price, it stays with me.  This is for the complete unaltered kit, plus the complete Amateur Radio Kits Universal Case DA Gray make just for this radio.  The price will not go any lower than this.  The complete kit with case retails near $200.  This is the final offer.


Re: More Nextion 3.5" tweaks to do

Sam Tedesco
 

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: Audio AVC

Jack Brabham - KZ5A
 

On 4/20/2019 10:16 PM, Jerry Gaffke via Groups.Io wrote:
Of course, if you're a true dinosaur, you're operating AM phone.
No BFO, and thus no such trouble.

Hey, I resemble that remark...yuk yuk yuk.

IMHO one of the uBitx's  shortcomings is lack of AM mode, my favorite
voice mode.

73 Jack KZ5A


Re: More Nextion 3.5" tweaks to do

Sam Tedesco
 

Hi Ted,

Joe is actually on the right path. If you look at his pspectrum page pic, he has opened up the vertical lines to extend across the 'black canvas' portion of the page. I looked around and added comments to the code from tmrDisplay so you can get an idea of what Ian is doing. tm0 is going to be a bit more difficult to get going for the graph portion.

sys2=0

if(nBeforeBase.val!=nFreq.val)

{

sys2+=1

}

if(nBeforePos.val!=hViewFreq.val)

{

sys2+=1

}

if(sys2>0)

{

nBeforeBase.val=nFreq.val

nBeforePos.val=hViewFreq.val

fill 0,0,247,52,10565

fill 0,25,247,2,16959 //horizontal line between top boxes

fill 120,10,2,15,16959 //small vertical line top box middle

cov nFreq.val,tmpS.txt,0

xstr 126,4,90,18,0,WHITE,10565,0,1,1,tmpS.txt //top right value

sys0=nFreq.val

sys0=2000*nADCCount.val/2 //2k step fixed

sys0=nFreq.val-sys0

nStartFreq.val=sys0

cov nStartFreq.val,tmpS.txt,0

xstr 2,4,90,18,0,WHITE,10565,0,1,1,tmpS.txt

//fill 0,160,247,20,31727

fill 0,164,247,14,10565 //background of bottom slider

fill 0,173,247,2,16959 //blue line on bottom slider

sys0=hViewFreq.val

sys0=sys0*1000

sys1=sys0+nStartFreq.val

nSelectFreq.val=sys1

cov nSelectFreq.val,tmpS.txt,0

//xstr 150,26,90,24,2,64520,GRAY,2,1,1,tmpS.txt

if(hViewFreq.val>120)

{

xstr hViewFreq.val-92,28,90,24,2,64520,10565,2,1,1,tmpS.txt

}else

{

xstr hViewFreq.val+2,28,90,24,2,64520,10565,0,1,1,tmpS.txt

}

fill hViewFreq.val,0,2,50,64520 //vertical line on top left

fill hViewFreq.val,164,2,14,64520 //small vert slider bottom box

}


Re: Audio AVC

Jerry Gaffke
 

Ted,

I assume it's this RF Amp from kitsandparts for $12:  http://www.partsandkits.com/rfamp1.3.php
Not a bad idea if you have a compromise antenna such that you don't hear band noise when the antenna
is hooked up to the radio, especially on the upper bands.
Though such an antenna may not be very effective for getting out with the transmitter.

Do you have the ND6T AGC circuit with the added series element: http://www.nd6t.com/uBITX/AGC.htm
 (A kit is available from https://shop.kit-projects.com/ )
Did you find that it didn't have enough dynamic range?

Perhaps you have the earlier ND6T AGC circuit:  http://www.nd6t.com/bitx/AGC
and thus needed the extra AGC circuit.

> The preamp 1st stage has about no delay while the 2nd is on a medium-fast timing.

So "no delay" means very fast attack and very fast decay?
I would not expect that to work very well with an SSB signal.
Did you add an extra LM386 just to sense the audio to drive this extra AGC attenuator?

A schematic would be interesting!

Jerry, KE7ER


On Sun, Apr 21, 2019 at 05:19 AM, Ted wrote:
For what it's worth, I present here the Crowbar Method. It incorporates the best of a quest for maximum sensitivity along with absolute overload protection.  It began when I saw a post here for a sideband RF preamp from partsandkits, an item that I've added to both ubitx projects here.  My first stage of AGC begins with that board.


18000km

ronmhauser@...
 

A quick love note for uBitx ... Just worked Andy VK5MAV/6 with my seven watts.  Heard him coming through loud and clear, really excellent receive on this radio.  He is a top notch operator and took my call split in traffic, he is activating some island off the west coast of Australia (OC-211 according to website search). 

He definitely did his part; I have a very quiet listening location; and my antenna is doing most of the work ... but still an exciting QSO to log.

7.005MHz CW, uBitx v5, only mods are RTLSDR tap on 45MHz first IF, and N6DT AGC.  Ant = fixed two element wire beam at 65ft.

73
--Ron
K0EIA


Re: Audio AVC

Ted
 

This thread has been very educational for those of us who haven't dived into the front ends of a radio nearly as reply as we've done on the output or other RF sections.  Thanks, to all.

For what it's worth, I present here the Crowbar Method. It incorporates the best of a quest for maximum sensitivity along with absolute overload protection.  It began when I saw a post here for a sideband RF preamp from partsandkits, an item that I've added to both ubitx projects here.  My first stage of AGC begins with that board.

See here, the underside of the Zombie Apocalypse Survival HF Go-Kit -




Under the mainboard, the P&K he preamp is mounted convenient to the RX  signal path.




It's a pretty simple matter to add a 2N7000 or similar FET to short out the incoming RF signal (via a small ceramic cap, for a little isolation) and to use rectified audio from a LM386 to provide clamping drive.  The FET starts clamping pretty well with about .8v so experimentation with feed resistors and a touch of drain bypass was needed.




It so happens that I had already installed a kit board ND6T-style AGC which was working OK on its own,  but I still wanted a preamp for use with spotty woodland-based aerials during the upcoming apocalypse of the walking dead. So, that's why the Crowbar here is what I called a first stage while the regular AGC is now a second stage.  The bonus is that, being as I'm using the i2c-2nd-Nano S-meter mod, I do not require the ND6T board's S-Meter output for that job. 

I decided to use that output to replace the 386 clamping source and, somewhat surprisingly, there is no fighting or oscillation between these two "stages" of RF level control (and the dynamic range is stupid wide!).   The preamp 1st stage has about no delay while the 2nd is on a medium-fast timing.

Schematic available if wanted.




Ted
K3RTA