Date   
Re: Diy oscilloscope #parts

Joe Puma
 

Thanks, as an example what are some of the testing functions you can use this with, with its specs lets say on a ubitx?

 

I want to learn more about using a scope while I diagnose and explore my ubitx build so I don’t know what the 0-200KHz range on that scope can do.

 

Joe

KD2NFC

 

Sent from Mail for Windows 10

 

From: N8DAH
Sent: Thursday, February 1, 2018 1:00 PM
To: BITX20@groups.io
Subject: Re: [BITX20] Diy oscilloscope #parts

 

one with case

one without

--
David

 N8DAH
Kit-Projects.com

 

Re: uBITX schema relay K1 #ubitx

Alf Baranda
 

Hello everyone.
I think you're talking about the same thing that I've been thinking about for some time.
Can it be the Mod that I have highlighted?

Excuse my poor English

Re: Care and Feeding of SMD Parts

Doug W
 

Kind of like asking if I want to get hit in the head with an 8 pound or a 10 pound hammer...


from https://en.wikipedia.org/wiki/Surface-mount_technology

Re: Diy oscilloscope #parts

 

http://www.arrl.org/oscilloscopes-for-radio-amateurs

good read

 I too am just getting into test equipment, google and lots of reading is all I can say.
--
David

 N8DAH
Kit-Projects.com

Re: Care and Feeding of SMD Parts

Vince Vielhaber
 

I've seen bigger specks of pepper than an 0402

Vince.

On 02/01/2018 01:41 PM, Doug W wrote:
Kind of like asking if I want to get hit in the head with an 8 pound or
a 10 pound hammer...


from https://en.wikipedia.org/wiki/Surface-mount_technology

Re: Diy oscilloscope #parts

Jerry Gaffke
 

I may have to get me one of them thar  DSO138's
At $23, fine with me if it doesn't actually work.
Still get an STM32F103 development board, an nice display, a scope probe, and that BNC to alligator thingie.
At that price, OK if one of the four does not work.

There's open source firmware for that scope:
    https://github.com/ardyesp/DLO-138

Analog bandwidth for a sampling scope is generally 1/5 of the ADC sample rate, so maybe useful to 200khz.
Good enough for much of what's needed around a bitx, especially if you don't have $400 for a Rigol.
To look at the RF stuff, might get by with a low end spectrum analyzer using something like the uBitx front end
up through the 12mhz crystal filter plus an ad8307 that can switch to either before or after that filter..

That DSO138 is using exactly the same processor as my Blue Pill (you do want to choose Truth, right?)
    http://wiki.stm32duino.com/index.php?title=Blue_Pill
Note that the blue pill is faster (much), cheaper (a bit), more memory, and more IO pins than a Nano.
I have no idea how they manage to sell them for $2.
Though it's not quite so fluent in Arduino as the Nano.
That takes some hardware hacks, and it's missing some libraries.

So could create a minimalist scope for $2 plus some junkbox R's and C's if you are really really cheap.
Send the data over whatever link you programmed it with for display on a laptop.

The STM32F401 has 64kbytes of RAM, a 2.4mhz ADC.
Same family as the STM32F103, software should port easily enough.

Jerry, KE7ER


On Thu, Feb 1, 2018 at 09:59 am, N8DAH wrote:

one with case

one without

Re: uBITX schema relay K1 #ubitx

Jerry Gaffke
 

Yes.
Jerry


On Thu, Feb 1, 2018 at 10:36 am, Alf Baranda wrote:
I think you're talking about the same thing that I've been thinking about for some time.
Can it be the Mod that I have highlighted?

Re: Diy oscilloscope #parts

Joe Puma
 

Favorite this post 



On Feb 1, 2018, at 2:02 PM, Jerry Gaffke via Groups.Io <jgaffke@...> wrote:

I may have to get me one of them thar  DSO138's
At $23, fine with me if it doesn't actually work.
Still get an STM32F103 development board, an nice display, a scope probe, and that BNC to alligator thingie.
At that price, OK if one of the four does not work.

There's open source firmware for that scope:
    https://github.com/ardyesp/DLO-138

Analog bandwidth for a sampling scope is generally 1/5 of the ADC sample rate, so maybe useful to 200khz.
Good enough for much of what's needed around a bitx, especially if you don't have $400 for a Rigol.
To look at the RF stuff, might get by with a low end spectrum analyzer using something like the uBitx front end
up through the 12mhz crystal filter plus an ad8307 that can switch to either before or after that filter..

That DSO138 is using exactly the same processor as my Blue Pill (you do want to choose Truth, right?)
    http://wiki.stm32duino.com/index.php?title=Blue_Pill
Note that the blue pill is faster (much), cheaper (a bit), more memory, and more IO pins than a Nano.
I have no idea how they manage to sell them for $2.
Though it's not quite so fluent in Arduino as the Nano.
That takes some hardware hacks, and it's missing some libraries.

So could create a minimalist scope for $2 plus some junkbox R's and C's if you are really really cheap.
Send the data over whatever link you programmed it with for display on a laptop.

The STM32F401 has 64kbytes of RAM, a 2.4mhz ADC.
Same family as the STM32F103, software should port easily enough.

Jerry, KE7ER


On Thu, Feb 1, 2018 at 09:59 am, N8DAH wrote:

one with case

one without

Re: Care and Feeding of SMD Parts

Jerry Gaffke
 

Our 1206's are Imperial, by the way.
That's 0.12 inches long, 0.06 inches wide.

The chart entirely missed the 0201's (Imperial).
Quite cheap if you buy 'em by the reel, check out Mouser 603-AC0201JR-075K1L
For some reason they don't seem to print the resistor value on them.

We sometimes used 0201's for board mods.
Good for adding an overlooked 100 ohm terminator, for example.
Fit nicely between adjacent 20mil pitch TQFP pins. 



On Thu, Feb 1, 2018 at 10:46 am, Vince Vielhaber wrote:
I've seen bigger specks of pepper than an 0402

Re: Case designed for uBITX - #3d_printing

Leland Lannoye
 

Mr. Beck:
Would you be able to make one for me?  What would the cost be? I have limited space for tools and construction..
Leland Lannoye, WA9AOE



Sent from my Verizon, Samsung Galaxy smartphone

-------- Original message --------
From: Carl Beck <carl@...>
Date: 2/1/18 09:23 (GMT-05:00)
To: BITX20@groups.io
Subject: [BITX20] Case designed for uBITX - #3d_printing

I designed a 3D printed Case especially for the uBITX.

Re: [SPAM] Re: [BITX20] Replacing the PA section on Bitx 40

Jerry Gaffke
 

Farhan recommends 100ma for the push-pull IRF510's on the uBitx.
More is better, you get into a more linear region of the FET.
But more means more power getting sucked from the battery if portable,
that power gets dissipated as heat in the FET's.
I'm going with 100ma.

With a 500ma quiescent drain current when using a 24v supply, each FET is dissipating 24*0.5 = 12 Watts.
That's a lot of heat.
Back of to 100ma and it is only 24*0.1 = 2.4 Watts.
Which still seems plenty.

You want to be very careful when adjusting those IRF510 gate bias trim-pots,
take it too far and those IRF510's might be trying to dump 100 Watts or so.

Jerry


On Thu, Feb 1, 2018 at 08:56 am, M Garza wrote:
I was looking at this schematic:
It showed different current levels for the bias.
 

BITX QSO Afternoon/Night, Sunday, February 4, 3PM/7PM Local Time, 7277 kHz in North America, 7177 kHz elsewhere

John P
 

BITX QSO Afternoon/Evening, Sunday, February 4, 3PM & 7PM Local Time, 7277 kHz in North America, 7177 kHz elsewhere.

Join us as we make contacts from BITX40 to BITX40 on 7.277 MHz in 40 meters!

This is a worldwide event for BITX40 stations starting at 7pm in each time zone. To participate, call CQ BITX on Sunday, starting at 3PM and/or 7PM your local time. The BITX QSO Night continues through the evening and conditions usually improve after sunset, so it is worthwhile to participate later in the evening.

Suggested Best Operating Practices:

Work at QRP power levels unless conditions require more power.
Call and listen for CQ BITX on the hour and every quarter hour.
It is helpful if you call CQ BITX with your callsign, name and location. 
Repeat your callsign a number of times during your CQ BITX and during QSO's.
Start a QSO by confirming the callsign, location, name and signal report of the other operator.
Say the callsign, name and location of the other operator so others can hear.
If the frequency is busy, avoid long conversations.
After your initial QSO is complete, ask if there are any other stations who would like to contact.

Report your QSO's, discuss propagation, noise, signal reports, audio reports, antenna type, etc. in this thread.

This is an undirected, scheduled event.  The BITX QSO Night relies on you to call CQ BITX to initiate contacts with other stations, so warm up that final and transmit a few calls on Sunday evening.  Talk to you then!
--
John - WA2FZW

Re: BITX QSO Afternoon/Night, Sunday, February 4, 3PM/7PM Local Time, 7277 kHz in North America, 7177 kHz elsewhere

John P
 

On Thu, Feb 1, 2018 at 11:59 am, John P wrote:
BITX QSO Afternoon/Evening, Sunday, February 4, 3PM & 7PM Local Time, 7277 kHz in North America, 7177 kHz elsewhere.
Since it's Stupidbowl Sunday, I'm not sure how many want to participate. I'll plan on being on at 3PM EST (2000Z), but probably not for the evening session. If folks think we should just skip this week altogether, please post in this thread.
 
--
John - WA2FZW

Re: [SPAM] Re: [BITX20] Replacing the PA section on Bitx 40

M Garza <mgarza896@...>
 

Jerry,
The bias amount I was referring to was for the RD16HHF1s, not the IRF510s.

Thanks.

Marco - KG5PRT

On Thu, Feb 1, 2018 at 1:42 PM, Jerry Gaffke via Groups.Io <jgaffke@...> wrote:
Farhan recommends 100ma for the push-pull IRF510's on the uBitx.
More is better, you get into a more linear region of the FET.
But more means more power getting sucked from the battery if portable,
that power gets dissipated as heat in the FET's.
I'm going with 100ma.

With a 500ma quiescent drain current when using a 24v supply, each FET is dissipating 24*0.5 = 12 Watts.
That's a lot of heat.
Back of to 100ma and it is only 24*0.1 = 2.4 Watts.
Which still seems plenty.

You want to be very careful when adjusting those IRF510 gate bias trim-pots,
take it too far and those IRF510's might be trying to dump 100 Watts or so.

Jerry

On Thu, Feb 1, 2018 at 08:56 am, M Garza wrote:
I was looking at this schematic:
It showed different current levels for the bias.
 


Re: uBITX schema relay K1 #ubitx

pe0fko
 

Yes perfect, that is the same idee. Nice picture also.

Re: Diy oscilloscope #parts

Christopher Miller
 

I am about to start. I will send updates. 

kf4ftr

Re: Diy oscilloscope #parts

Christopher Miller
 

oops I didn't see all the replies. I purchased the kit and the case on wish. They are sold separately. It looks like its searchable by dso138 or 13804k.

chris kf4ftr

Re: BITX QSO Afternoon/Night, Sunday, February 4, 3PM/7PM Local Time, 7277 kHz in North America, 7177 kHz elsewhere

 

Don't watch the stuff so I will be on.
--
David

 N8DAH
Kit-Projects.com

Re: Care and Feeding of SMD Parts

James Lawrie
 

Hello,

The 2512 parts look doable if they sell them still that size. Thanks for the pic.

James Lawrie

On Feb 1, 2018, at 12:41, Doug W <dougwilner@...> wrote:

Kind of like asking if I want to get hit in the head with an 8 pound or a 10 pound hammer...

<330px_SMT_sizes,_based_on_original_by_Zureks.svg.png>
from https://en.wikipedia.org/wiki/Surface-mount_technology

Re: Care and Feeding of SMD Parts

Roy Appleton
 

Mike, if you get a chance, would you provide a link example of the spring load 1" boxes.

Thanks
Roy
WA0YMH

On Feb 1, 2018 11:18 AM, "Michael Hagen" <motdog@...> wrote:

I am throwing away a bag of 0402s I have collected over the years.  I hate them!

I have 10s of thousands of SMDs.  I have shoe boxes full.  Some of the "Pill" boxes at the 99Cent stores work OK.

I take a 100 at a time out of the strips so I can grab them with tweezers out of pill boxes.  I label the top with a small avery label.

You can even get them for 5 or so pills a day and 7 days.  So 28 compartments in one small box.  Some pill boxes are so cheap, it is hard to open the flap lids.  So I have learned to buy just one for trial.

The deluxe way to go is the interlocking 1" boxes from the internet.  They lock together in any size pattern.  The lids are clear and have a spring.  You push the latch with your tweezers and the lip flips up.   Some vendors even send the whole selection of resistors out in them.   In about 1 ft Sq, you can get the whole range of 5% values.

73's

Mike, WA6ISP


On 2/1/2018 8:31 AM, Jack Purdum via Groups.Io wrote:
Good Lord! I can't even SEE 0402's!

Jack, W8TEE



From: Jerry Gaffke via Groups.Io <jgaffke@...>
To: BITX20@groups.io
Sent: Thursday, February 1, 2018 11:05 AM
Subject: Re: [BITX20] Care and Feeding of SMD Parts

Tim said:    I take a piece of printer paper and slit the corners so I can fold it into a tray.

I say:    http://www.origami-fun.com/support-files/origami-box-print.pdf
That way you don't have to dig around the workspace for 30 minutes to find the scotch tape.

When hand stuffing surface mount parts, working within a large baker's cake tin
can somewhat restrain all them flying 0402's and Sot23's.



On Thu, Feb 1, 2018 at 07:21 am, Tim Gorman wrote:
I take a piece of printer paper and slit the corners so I can fold it into a tray.



-- 
Mike Hagen, WA6ISP
10917 Bryant Street
Yucaipa, Ca. 92399
(909) 918-0058
PayPal ID  "MotDog@..."
Mike@...