Date   
Re: Checking irf510

M Garza <mgarza896@...>
 

If they all showed as being a mosfet, they are working.  It would show something else, otherwise.
What is the gate voltage, when transmitting?  It should be between 2 & 4 vdc.
I doubt anyone is making a joke about this.  You have to do some detective work.  We do not have access to the board.  Is there someone you know, locally, that can help you troubleshoot?  Have you traced the rf signal in the output stages to see where the signal stops?  It was suggested that you build a rf probe, have you done that?  It will help, immensely.
This isn't something we are going to be able to say, " oh that is such & such part.  Replace that.."  you will have to dig in.  This is not a terribly complex radio.  It is easily fixable.  It was working, but it let out some smoke.  In what area did this happen?  Have you looked at the parts and traces in that area?
We are here to help, but we need you to be thorough and we need as much info as you can provide.

Marco - KG5PRT 

On Jan 28, 2018 5:27 AM, "César EA3IAV" <Cesarleon@...> wrote:
how can i check if a fet is shorted or blown?

i have this piece of hardware but i have no clue if this values are fine

here you have a brand new irf510



here a used one that may be dead but i don’t know...
I checked several that i have used and they have similar values

Re: Checking irf510

K9HZ <bill@...>
 

It won’t show up as a fet if its blown!

 

 

Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ

 

Owner - Operator

Big Signal Ranch – K9ZC

Staunton, Illinois

 

Owner – Operator

Villa Grand Piton – J68HZ

Soufriere, St. Lucia W.I.

Rent it: www.VillaGrandPiton.com

Like us on Facebook! facebook icon

 

 

email:  bill@...

 

From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of César EA3IAV
Sent: Sunday, January 28, 2018 7:27 AM
To: BITX20@groups.io
Subject: [BITX20] Checking irf510

 

how can i check if a fet is shorted or blown?

i have this piece of hardware but i have no clue if this values are fine

here you have a brand new irf510



here a used one that may be dead but i don’t know...
I checked several that i have used and they have similar values

Re: IRF510 amplifier failures

K9HZ <bill@...>
 

One of those little Hall-effect surface mounts would be perfect for this application…  The SGC mobile amp does this as I recall (maybe not… getting old!)!

 

 

Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ

 

Owner - Operator

Big Signal Ranch – K9ZC

Staunton, Illinois

 

Owner – Operator

Villa Grand Piton – J68HZ

Soufriere, St. Lucia W.I.

Rent it: www.VillaGrandPiton.com

Like us on Facebook! facebook icon

 

 

email:  bill@...

 

From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of Arv Evans
Sent: Saturday, January 27, 2018 4:14 PM
To: BITX20@groups.io
Subject: Re: [BITX20] IRF510 amplifier failures

 

Hello

Still thinking about IRF510 failures and ways to avoid making smoke.....

It seems that there may be two ways to limit current in BITX RF PA stages that use
the IRF510 device.  First would be to incorporate a current limiter in the positive
voltage supply to the RF PA stage.  Second might be to use current sensing in the
RF PA supply line to cause a voltage drop in the MOSFET bias line(s). 

In the first instance it should be possible to use another IRF510 or preferably a higher
power, MOSFET as a control that limits voltage to the RF PA section if the current exceeds
a preset value (usually this would be 2.0 to 3.0 amperes). 


This circuit has not been built or tested by me (too cold in Idaho hamshack in winter).
The MOSFET could be an IRF840, or similar.  Option-B  potentially solves another
problem, that of low level noise from powered RF PA stage during receive mode. 

In the second instance we could get by with smaller control devices if we used
current sensing in the RF PA power line to turn off bias to the IRF510 device(s). 


This bias control circuit used by AC2CZ in his 50 watt IRF510 linear.  You could
probably do this using 2N3906 transistors.  I like the fact that it includes a warning
light/LED.


Arv  K7HKL
_._

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

César EA3IAV
 

It look like my nano is dead.
i swapee lcd and it seems ok on that

I have ordered another one. I see several ino files. Each one seems to do Something specific 
do the have to all have to be flashed ? Is there a special order? I will have a blank nano tomorrow...

thank you!

Re: PiZeroW Controlling a uBitx

Jack, W8TEE
 

Anyone thought about using a PiZeroW (or even a regular RPi) for controlling a uBitx?

Yes. The problem we're running into is that there is nowhere the depth of support libraries for the graphics displays, at least, we haven't seen them. The spectrum display is especially attractive since the RP has a fast processor and a lot of memory.  I'm sure there are FFT (and other) support libraries out there, I just haven't found them yet.

Jack, W8TEE


From: Diver Martin <diver.martin@...>
To: BITX20@groups.io
Sent: Sunday, January 28, 2018 1:22 AM
Subject: [BITX20] PiZeroW Controlling a uBitx

Anyone thought about using a PiZeroW (or even a regular RPi) for controlling a uBitx?

I thought to myself, while pondering my design decisions, "Hey, a PiZeroW is $10.  A Teensy3.2 is $20..."  Looking quickly at the pinout, it has spi and i2c, and a few GPIO's.  I don't have any experience programming the raspberry pis, but adding an i2s audio dac (or two) could easily do DSP audio, spectrum display, etc... I have my RpiZeroW hooked up to a 3.5" TFT touchscreen display I got off amazon... (https://www.amazon.com/UCTRONICS-Display-Touch-Screen-Raspberry/dp/B073QGW2M6/)

Mostly just curious.  Doubt I'll change directions with my top mod PCB, but it certainly could be an interesting option (The RpiZeroW consumes ~250mA @ 5V as I recall)

--
Martin Held - AE7EU
http://ae7eu.com/
-------------------------------------------------------------------------------
If there aren't any questions, then what is there to learn?



Virus-free. www.avast.com

Re: PiZeroW Controlling a uBitx

Doug W
 

Another consideration since you mentioned the W variant, RF from the radio will knock out the wifi on the pi.  I am running WSPR (tx only) on a PiZeroW with the shield from TAPR http://tapr.org/kits_20M-wspr-pi.html  I use VNC to remote into the pi and as soon as tx starts the wifi goes out.  I solved it by separating the pi and the shield with 20cm jumpers.  Keep in mind that is with only 100mW out.
It is worth mentioning with just a wire antenna tacked up on the inside of my garage my signal has been picked up 13087km away, from US to New Zealand.  Of course all credit is due to K1JT and the station on the rx side.

Re: My ubitx Finally shipped

KM4TRT
 

Mine was ordered Dec 15th. Also got shipping notice yesterday, but going India post to Florida, so probably 3 weeks.
Andy KM4TRT 

Re: PiZeroW Controlling a uBitx

Doug W
 

On Sun, Jan 28, 2018 at 06:43 am, Jack Purdum wrote:
I'm sure there are FFT (and other) support libraries out there, I just haven't found them yet.
Have you seen this? 
https://www.raspberrypi.org/blog/accelerating-fourier-transforms-using-the-gpu/

Re: ubitx delivery

Art Howard
 

I ordered mine December 18th and still no word

On 28 Jan 2018 6:20 am, "crofter" <leefamily.44@...> wrote:
how do i find my deliver time frame and approx shipping date could hf signals anser please ordered mid january


tks
crofter

Re: ubitx delivery

Joe Puma
 

You should probably email them directly. Don’t think you’re gonna get an answer here in the group. 




Sent from my iPhone

On Jan 28, 2018, at 7:20 AM, crofter <leefamily.44@...> wrote:

how do i find my deliver time frame and approx shipping date could hf signals anser please ordered mid january


tks
crofter

Re: FS: Bitx AGC Kits

David Arthur
 

Count me in for one as well!
--
David K4DBZ
Unofficial bitx chatroom: https://discord.gg/CrHvWFc

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

Joe Puma
 

Good gosh. You’re not having any luck over there are you.  Slow it down and take your time. Mistakes happen when you rush

Joe
KD2NFC 


Sent from my iPhone

On Jan 28, 2018, at 7:46 AM, César EA3IAV <Cesarleon@...> wrote:

i plugged the pins in tge wrond side. Now the sreen is like this 
i guess i ruined the arduino nano board a d maybe something else


I see that arduino power led is fine

how can i check that it is still alive? Mabe i just broke something in the board atached to it


Re: PiZeroW Controlling a uBitx

Jack, W8TEE
 

Very impressive!!

Jack, W8TEE



From: Doug W <dougwilner@...>
To: BITX20@groups.io
Sent: Sunday, January 28, 2018 11:14 AM
Subject: Re: [BITX20] PiZeroW Controlling a uBitx

On Sun, Jan 28, 2018 at 06:43 am, Jack Purdum wrote:
I'm sure there are FFT (and other) support libraries out there, I just haven't found them yet.
Have you seen this? 
https://www.raspberrypi.org/blog/accelerating-fourier-transforms-using-the-gpu/



Virus-free. www.avast.com

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

Joe Puma
 

What’s up with the driver on U3. A leg looks burnt. 


Sent from my iPhone

On Jan 28, 2018, at 8:03 AM, César EA3IAV <Cesarleon@...> wrote:

Sorry i forgot the foto


<932B9C2A_4821_41E0_9B29_EE7530F23AA2.jpeg>

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

Joe Puma
 

Someone else here might of did the same thing and bricked the raduino the same way. You may have toasted it. 


Sent from my iPhone

On Jan 28, 2018, at 8:12 AM, César EA3IAV <Cesarleon@...> wrote:

I tried several possitiona. Lcd light dims but no characters are shown
thanks

Re: Checking irf510

Arv Evans
 

César EA3IAV

Your "universal tester" unit is telling you quite a bit about your MOSFETs.  As others
have said, "if it identifies the device as a MOSFET the device is testing as GOOD". 

Because this tester uses fairly low voltages the internal capacitance may show as
fairly high relative to the datasheet.  IRF510 type MOSFETs internal capacitance
decreases as you increase the drain-to-source voltage.  This is why they are usable
into low VHF frequencies when operated at higher voltage.  It is also why they make
very good VVCs (Voltage Variable Capacitors), but that is a story for some other post.

The tester is also telling you what the base bias needs to be to turn the IRF510 ON.
Because this is a MOSFET the tester treats it as a switch instead of as a linear
amplifier, but that test is adequate to tell you if the device is GOOD or BAD.

As mentioned by others, my earlier suggestion that you obtain or build a Diode RF
Probe similar to that designed by N5ESE is still valid and highly recommended.

Arv  K7HKL
_._

On Sun, Jan 28, 2018 at 6:16 AM, M Garza <mgarza896@...> wrote:
If they all showed as being a mosfet, they are working.  It would show something else, otherwise.
What is the gate voltage, when transmitting?  It should be between 2 & 4 vdc.
I doubt anyone is making a joke about this.  You have to do some detective work.  We do not have access to the board.  Is there someone you know, locally, that can help you troubleshoot?  Have you traced the rf signal in the output stages to see where the signal stops?  It was suggested that you build a rf probe, have you done that?  It will help, immensely.
This isn't something we are going to be able to say, " oh that is such & such part.  Replace that.."  you will have to dig in.  This is not a terribly complex radio.  It is easily fixable.  It was working, but it let out some smoke.  In what area did this happen?  Have you looked at the parts and traces in that area?
We are here to help, but we need you to be thorough and we need as much info as you can provide.

Marco - KG5PRT 

On Jan 28, 2018 5:27 AM, "César EA3IAV" <Cesarleon@...> wrote:
how can i check if a fet is shorted or blown?

i have this piece of hardware but i have no clue if this values are fine

here you have a brand new irf510



here a used one that may be dead but i don’t know...
I checked several that i have used and they have similar values


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

Jack, W8TEE
 

If you are comfortable with using the Arduino IDE, why not load the ASCII table program (i.e., Examples\04. Coomunication\AsciiTable) and see if it runs. You can view the Serial monitor by clicking on the magnifying glass icon that appears near the top-right of the IDE screen. Make sure the number (e.g., the 9600 in Serial.begin(9600)) matches the baud rate set near the bottom of the Serial monitor. If you see the table, the Nano is probably ok.

Jack, W8TEE



From: Joe Puma <kd2nfc@...>
To: BITX20@groups.io
Sent: Sunday, January 28, 2018 11:24 AM
Subject: Re: [BITX20] I did it again.. i plugged the arduino pins on reverse

Good gosh. You’re not having any luck over there are you.  Slow it down and take your time. Mistakes happen when you rush

Joe
KD2NFC 


Sent from my iPhone

On Jan 28, 2018, at 7:46 AM, César EA3IAV <Cesarleon@...> wrote:

i plugged the pins in tge wrond side. Now the sreen is like this 
i guess i ruined the arduino nano board a d maybe something else


I see that arduino power led is fine

how can i check that it is still alive? Mabe i just broke something in the board atached to it





Virus-free. www.avast.com

Re: uBITX Firmware (CEC) 0.30 released (Test version). #ubitx

Dave Bottom <ars.kd6az@...>
 

Hi Ian,

OK, thank you for the clarification.  I suspected that was the case. :o) 

Mike, 

Yes when I do add the Chip resistors I'll take a picture and post it.

Dave WI6R

On Sat, Jan 27, 2018 at 9:12 PM, Ian Lee <kd8cec@...> wrote:
Dave

Thanks for your information.

My modified code (Ron's cw keying) does not use A7 for factory shipping users.
Until now, the firmware concept was applied without modification of the hardware.
I am going to end this project because I do not have any further improvements without hardware modifications.

When additional uBITX order arrives, I try to do a variety of fun H / W hacks.At that time, I will use A7 as Paddle and connect to S.Meter.

Ian KD8CEC

2018-01-28 6:14 GMT+09:00 Dave Bottom <ars.kd6az@...>:
Ian 

The v.30 with Ron’s CW Keying code does include adding the 4.7k pull-up at A7, as a modification to hardware.

I’m planning on adding both 4.7K chip resistors directly on the pads of the Raduino so there are no loose resistors to mount at the key jack(s).

Dave WI6R

Sent from my iPhone

On Jan 27, 2018, at 2:39 AM, Ian Lee <kd8cec@...> wrote:

I have not posted it on my blog separately since it is a test version. When the test is complete,  write a usage and post it.
I am writing for someone who is interested and test.  If I get an error report or a fix, I'll fix it and make it into github's 0.31 branch.

Here is a brief description of the change from 0.30.
improved CW Keying, Frequency Tune and CW performance according to users' requirements.
In particular, CW Keying applied ron's logic for use with original hardware. also made it possible to set the CW Key ADC range to reduce errors in CW.
ADC monitoring function is added to know the exact resistance and key contact status.
I thought that if you set your own ADC range using the measured values here, you would get an error. I need to test these things, so I leave this post.

removed all existing sources related to frequency tune. And i applied threshold, weight about speed, and steps. The problem of changing the frequency at the moment of catching the knob has probably disappeared. when the threshold has been exceeded, start frequency changing, i added some logic to prevent the thresholds from becoming unnatural.
If you want to fine-tune, slowly turn it and the threshold will be applied continuously and change very slowly.
The tune steps you can select now are 10, 20, 50, 100, 200, but you can change them in uBITX Manager 0.31 (now working)
You can change the step by pressing the function key for a long time. If you keep pressing it, Diallock will work.

The ham band movement applied at 0.28 was set to 0.30, so that region1 was set as the default.
Of course, you can change to the previous operation state by pressing the function key in the band select menu for a long time.
And like the 0.28 version, you can set up to 10 frequency bands in uBITX Manager to suit your country or your liking.

Please refer to below for the improvements and how to upload firmware and more detail.
The source and compiled firmware can be found in the release below link.
https://github.com/phdlee/ubitx

How to upload firmware and use version up to version 0.27
http://www.hamskey.com

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



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




--
73 Dave WI6R

Re: FS: Bitx AGC Kits

Sr Shobe
 

Would like one too....built if possible...still rough with smd. Steve/NOAA lol

On Jan 28, 2018 10:23 AM, "David Arthur" <mumrah@...> wrote:
Count me in for one as well!
--
David K4DBZ
Unofficial bitx chatroom: https://discord.gg/CrHvWFc

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

Arv Evans
 

Cesar  EA3IAV

You may have blown your Arduino NANO, or maybe not.  In the later picture the red POWER
indicator LED is ON, indicating that your NANO is receiving power, but that does not really
tell you the state of the on-board voltage regulator or the micro-processor itself. 

You can test your NANO and the associated LED but the process may not be easy unless
you are already familiar with writing software to the NANO.  If you are familiar with writing
software to the NANO you can overwrite the existing BITX software with something like the
"BLINK" program that is in Examples in the Arduino IDE.  If this is successful (if the LED
actually blinks) it would indicate that at least part of the NANO micro-controller is working.
Problem with doing this is that you have to overwrite your original BITX operating system
with BLINK code, and then re-write the BITX software back into the NANO after doing the
BLINK test. 

https://github.com/amunters/bitx40


https://github.com/afarhan/ubitx

There is nothing particularly unique about the Arduino NANO that is used in the BITX or
uBITX transceivers.  Any Arduino NANO that has the standard NANO pinout should work
after you have programmed it with the appropriate BITX software.  At present I see NANO
boards going for about US$3.25 each on Ebay.  New NANO boards from most vendors
come pre-programed with the boot-loader and the BLINK program.

https://groups.io/g/BITX20/attachment/21076/0/Raduino%20Pinout.pdf

Arv  K7HKL
_._




On Sun, Jan 28, 2018 at 5:46 AM, César EA3IAV <Cesarleon@...> wrote:
i plugged the pins in tge wrond side. Now the sreen is like this 
i guess i ruined the arduino nano board a d maybe something else


I see that arduino power led is fine

how can i check that it is still alive? Mabe i just broke something in the board atached to it