Date   
Re: New for pi-day, the Rasberry Pi 3 B+

V Zecchinelli
 

Isn't the new Raspberry Pi Tablet battery powered?

Vince N1VIN



On 3/15/2018 9:32 AM, freefuel@... wrote:
On Wed, Mar 14, 2018 at 01:43 pm, Jerry Gaffke wrote:
While the new Raspberry pi model seems nice, they still have not addressed a serious matter for battery powered operation. that issue is power management! 
-Justin N2TOH 

Re: RD transistors, unobtanium?

denm178@...
 

I just ordered some  rd16hhf1 frrom RFparts ,on 2nd page of RD devices below the listing.
73 Dennis

Re: adrino

Jerry Gaffke
 

I assume you mean the Mega 2560.
    https://www.amazon.com/Elegoo-Project-Starter-Arduino-Mega2560/dp/B01GEEWIPA
That's their cheapest kit, seems adequate.   
Note the solderless breadboard and pre-cut wires with header pins.
No need to spend a day with soldering iron and wire strippers to make it do something.

To really get a feel for what a computer is, download the processor datasheet and read the 
half dozen pages that describe the "AVR Core" starting on page 11.
    http://ww1.microchip.com/downloads/en/DeviceDoc/Atmel-2549-8-bit-AVR-Microcontroller-ATmega640-1280-1281-2560-2561_datasheet.pdf

Then write a simple Arduino program for it and generate an assembly language listing of
your compiled C code, figure out what's going on.  The Arduino forums would be a good 
place to go for help on this. 

That's a good solid introduction to computers.
The full set of modern programming tools available for free with Ubuntu are very powerful
and highly recommended, but it's hard to ever touch bottom. 
You might never really know what a computer -is-.

Jerry, KE7ER


On Thu, Mar 15, 2018 at 08:06 am, kc0wox Leeper wrote:
I have the Elegoo Mega 2650 progect kit and what I really like about the elegoo kits is their tutorial that comes with the kit. It is made for the board you get and you get everything needed to do the tutorials.
Leonard
kc0wox

Re: Received my uBitx!

JP JO
 

On Mar 15, 2018, at 11:23 AM, Jerry Gaffke via Groups.Io <jgaffke@...> wrote:

Good luck finding a 7509.   (Did you mean LM7805?)
There are web reports of clone chips out there that blow if over 7v.
Don't know about the WX, but 5 or 6v would be safer than 9v.

On Thu, Mar 15, 2018 at 07:01 am, John McClun wrote:
I looked and I too have the WX chip.  I plan on doing the 7509 regulator SMD MOD as it's an almost drop on the board fix.

Re: Raduino oscilators. 33mhz and 57mhz. Documentation says one thinng, but this is what I measured.

Michael Shreeve
 

I would have to think he is using the incorrect word. By "trivial" perhaps he means "easy" ? Trivial , to us, would mean unimportant. Not sure how easy it would be to do this, but I'm thinking this is what he meant.

Re: RD transistors, unobtanium?

Michael Hagen
 

http://www.futurlec.com/Transistors/2SC2078pr.shtml


On 3/14/2018 7:31 PM, Ashhar Farhan wrote:
I am trying to find transistors for our future work. The TDA2822 episode has had me hurting. It is time we identified some long term candidates for RF power. 
- f

On 15 Mar 2018 7:46 am, "KD8CGH" <rkayakr@...> wrote:
Also ordered 6 while having a leisurely beer to pass the time between screens.


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

Re: New for pi-day, the Rasberry Pi 3 B+

ajparent1/KB1GMX
 

For performance the Asus Tinkerboard has it seriously beat.  Not only faster 1800mhz but twice the ram 2gb.
All the sam IO and hardware still there and same form factor so it fits in the same places.

I know this as I have both RPI 3B and Tinkerboards.  

The problem is faster currently means more power needed.  

Allison

Re: Watch out forGROUP.IO STOPPING emails

Robert Alexander
 

That has happened to me also.

 

Robert (N5RHA)

 

 

 

From: BITX20@groups.io <BITX20@groups.io> On Behalf Of Ronald Pfeiffer via Groups.Io
Sent: Thursday, March 15, 2018 10:05 AM
To: BITX20@groups.io
Subject: [BITX20] Watch out forGROUP.IO STOPPING emsils

 

Less than 8 hours in New England with no internet access and Group.io

stops sending you emails! 

 

Was not aware it happened but after a while I figured since I was no longer

getting BIT20 emails I went to the website.  Clicked on the "UNBOUNCE"

and started getting emails again.  But the later they stopped.  I just went to the

webpage to find out again I was "BOUNCED".  I "UNBOUNCED" again.

 

Will see how long I stay "UNBOUNCED"!

 

rOn

Re: RD transistors, unobtanium?

ajparent1/KB1GMX
 

RD series are still available.  Local suppliers may be the issue but here in USA its widely
available.  They work ok for 12V only designs.

Regarding IRF530, it can be used and does work at 30mhz but impedance matching
is harder due to the high input capacitance compared to the IRF510.   I have driven a
IRF530 at 6M, nice 35w output at 28V but the input matching was 6M only.  Like most
of the 100V mosfets they work much better with higher applied voltages on the drain. 


Allison

Re: Raduino oscilators. 33mhz and 57mhz. Documentation says one thinng, but this is what I measured.

Michael Shreeve
 

This BFO calculate code may be all that is needed but do isn't it possible that Ashhar also may use a master clock calibration routine when he aligns uBITX raduinos in the factory ? 

Re: RD transistors, unobtanium?

Vince Vielhaber
 

I seem to recall the IRF-520 being the closest IRF sub for the IRF-510. Never tried it tho. Last time I ordered 510s I also ordered 520s just in case.

Vince.

On 03/15/2018 12:25 PM, ajparent1 wrote:
RD series are still available. Local suppliers may be the issue but
here in USA its widely
available. They work ok for 12V only designs.

Regarding IRF530, it can be used and does work at 30mhz but impedance
matching
is harder due to the high input capacitance compared to the IRF510. I
have driven a
IRF530 at 6M, nice 35w output at 28V but the input matching was 6M
only. Like most
of the 100V mosfets they work much better with higher applied voltages
on the drain.


Allison

Re: Officially done with my uBITX!

 

Michael,

The pics should tell the whole story, oh, and there was a file involved.

Joel
N6ALT

Re: Raduino oscilators. 33mhz and 57mhz. Documentation says one thinng, but this is what I measured.

Don, ND6T
 

My Raduino reference was not when it arrived, and my BFO certainly was not (for my ears, at least). It worked OK but I enjoy being able to tune in any of the WWV stations at their correct frequency and be able to listen on either sideband without adjustment. It also reinforced my understanding of how it works. As I have said before, works for me. Your experience may differ. Looking forward to our next uBITX to uBITX QSO, by the way! -Don

Re: RD transistors, unobtanium?

Ashhar Farhan
 

The RD16 is no longer manufactured. The RD15 is no longer recommended for new designs. We have seen how things panned out for the TDA2822. I would vote to avoid devices that will soon be out of stock. There are the RD06 devices though that are available.and will continue to be available for a while.
The strongest reason to switch away from the IRF series was their declining gain. The IRF510 second sources are still being manufactured. 

On 15 Mar 2018 10:00 pm, "Vince Vielhaber" <vev@...> wrote:
I seem to recall the IRF-520 being the closest IRF sub for the IRF-510. Never tried it tho.  Last time I ordered 510s I also ordered 520s just in case.

Vince.



On 03/15/2018 12:25 PM, ajparent1 wrote:
RD series are still available.  Local suppliers may be the issue but
here in USA its widely
available.  They work ok for 12V only designs.

Regarding IRF530, it can be used and does work at 30mhz but impedance
matching
is harder due to the high input capacitance compared to the IRF510.   I
have driven a
IRF530 at 6M, nice 35w output at 28V but the input matching was 6M
only.  Like most
of the 100V mosfets they work much better with higher applied voltages
on the drain.


Allison


--
  Michigan VHF Corp.   http://www.nobucks.net/   http://www.CDupe.com/
                          http://www.metalworkingfun.com



Soldering gun or iron

Fr Richard R <rickocr2005@...>
 

I know this is a basic basic question, though it has been a long time since I have done kits or even soldering of this type.  My uBix is arriving today, hopefully!
So which soldering gun or iron should I purchase......?  Please forgive for such a noob question.

Fr Richard
WB8YXF


Re: New for pi-day, the Rasberry Pi 3 B+

Jerry Gaffke
 

The 8 bit Atmel processors are 20 or 30 years out of date, but a big community of users to get help from.
The $2 Blue Pill ARM STM32F103's seems the current best bang/buck.
But something small and stupid is a very good place to start if you really want to know what a computer is.
As I mentioned in my previous post, the  AVR Core section of the ATMega640 datasheet is about 6 pages long.
Figuring out an ARM would be somewhat more difficult. 

The Asus Tinkerboard could be interesting to folks here as an alternative to the RPi's for standalone digital.
Though most of my projects don't need that much processing power.
And many are just fine with an 8 bit ATMega.

The RPi-zero might be a good choice for a standalone rig with digital modes.
A brief google search suggests it can be throttled back to well under 100ma,
making it less than the uBitx receiver and thus perhaps good enough.
    https://www.jeffgeerling.com/blogs/jeff-geerling/raspberry-pi-zero-power
That supply current will rise considerably when you give it a job doing FFT's.
Far less processing power than a Tinkerboard, but less battery power too.
Oh, and $5.

Good time to be a geek.
I remember back in the late 70's, trying to build a Z80 system from scratch.
Never got completed.
Minimalist kits were $1k+ in 1978 dollars, and considerably less powerful than these ATMega's.

Jerry, KE7ER


On Thu, Mar 15, 2018 at 09:07 am, ajparent1 wrote:
For performance the Asus Tinkerboard has it seriously beat.  Not only faster 1800mhz but twice the ram 2gb.
All the sam IO and hardware still there and same form factor so it fits in the same places.

I know this as I have both RPI 3B and Tinkerboards.  

The problem is faster currently means more power needed.  

Allison

Re: Officially done with my uBITX!

 

Hi Denis,

Yes a Bitx40 would fit with room to spare, in fact I've used much smaller cases for my Bitx40 and my Bitx60.

Joel
N6ALT

Re: Raduino oscilators. 33mhz and 57mhz. Documentation says one thinng, but this is what I measured.

Jerry Gaffke
 

I understood "trivial" to mean "easy" in that context without a second thought.
Not so sure what "us" means though.


On Thu, Mar 15, 2018 at 09:02 am, Michael Shreeve wrote:
I would have to think he is using the incorrect word. By "trivial" perhaps he means "easy" ? Trivial , to us, would mean unimportant. Not sure how easy it would be to do this, but I'm thinking this is what he meant.

Re: Officially done with my uBITX!

Joe Puma
 

I used to install car stereos and alarms in the 80’s. Give me a dermal or a small jig saw, some plastic and a FILE and I can make the straitest bezel opening for your bezibox you would swear it was machine cut. 

Good job Joel
 



On Mar 15, 2018, at 1:00 PM, Joel Caulkins <caulktel@...> wrote:

Michael,

The pics should tell the whole story, oh, and there was a file involved.

Joel
N6ALT<IMG_3142.JPG><IMG_3141.JPG>

Re: RD transistors, unobtanium?

Henning Weddig
 

Accorfding to the internet site

http://www.mitsubishielectric.com/semiconductors/php/oSearch.php?FOLDER=/product/highfrequency/siliconrf/discrete

the RD16HFF1 and also other RD transistors are still manufactured, the latest data sheet is from July 2017

Henning Weddig
DK5LV

Am 15.03.2018 um 18:04 schrieb Ashhar Farhan:

The RD16 is no longer manufactured. The RD15 is no longer recommended for new designs. We have seen how things panned out for the TDA2822. I would vote to avoid devices that will soon be out of stock. There are the RD06 devices though that are available.and will continue to be available for a while.
The strongest reason to switch away from the IRF series was their declining gain. The IRF510 second sources are still being manufactured. 

On 15 Mar 2018 10:00 pm, "Vince Vielhaber" <vev@...> wrote:
I seem to recall the IRF-520 being the closest IRF sub for the IRF-510. Never tried it tho.  Last time I ordered 510s I also ordered 520s just in case.

Vince.



On 03/15/2018 12:25 PM, ajparent1 wrote:
RD series are still available.  Local suppliers may be the issue but
here in USA its widely
available.  They work ok for 12V only designs.

Regarding IRF530, it can be used and does work at 30mhz but impedance
matching
is harder due to the high input capacitance compared to the IRF510.   I
have driven a
IRF530 at 6M, nice 35w output at 28V but the input matching was 6M
only.  Like most
of the 100V mosfets they work much better with higher applied voltages
on the drain.


Allison


--
  Michigan VHF Corp.   http://www.nobucks.net/   http://www.CDupe.com/
                          http://www.metalworkingfun.com