On May 7, 2018, at 2:08 PM, ajparent1/KB1GMX <kb1gmx@...> wrote:

As a bleeding edger...  CP/M 1.3, 1.4 and 2.2,  Smallc,  BDS C and even Pascal.
My copy of K&E has a Bell system cover and marginal notes from K!  I Used to call
on them back when and it was a gift, one I treasure.   However space was never
an issue as I was running hard disks before many.  I may add that system is
still in use as I can bang out good code fast on it (large library and old code
reserve) and a 10mhz Z80 kind does the job.

When I want to show the kiddies I fire up the the microPDP 11/23 (its smaller)
and run Unix V6 and show how far we have not gone.

Coding style.  I try to keep the code English as adverse to "reads like Greek".
Many many years in assembler and macro assemble if I could not figure it
out six months later either it needed more comments or I was trying to be
too slick.  So all the C I wrote/write is every effort to be plain, structured
and consistent in style even if I'm doing different than last project.  One
area is data structures shat I see these days is very hard to decrypt due
to layers of layers.  Yes, I know its C++, sometimes leaving out the ++ part
makes it cleaner other times It is handy to make it better packaged.  I'm
used to writing for small systems as in embedded and often resource limited.
Arduino feels big to me!

Oh, 64x16 must be a PT VDM-1 video or similar, Stiill have a system using that.
I've accumulated systems over the years astating with my first build back in '74.

Allison

I ordered a uBITX case from https://amateurradiokits.in/store/ BITX Store by Sunil. on March 23,2018.
I reported he was shipping 50 cases when I contacted him last week regarding a DHL upgrade to shipping.
My case was shipped DHL 2018-05-04 from India
Arrived KANSAS USA DHL 2018-04-07 1100 hr local.
Case is beautiful.. Siemens Gray..
Note the case comes with:
10K linear pot
Main tuning knob
Small knob (volume)
Push on - power switch
Fuse Holder
DC socket
DC connector
SO239 connector
Speaker 8 ohm
Screws for PCB and case
Plastic and Brass standoffs.
Acrylic Cover for LCD -(Window)
4 pin Mic socket.
PCB for USB sockets
USB socket
DB 9 socket -for accessories on rear panel
3 extra PCB boards...
PCB mounting for Rotary encoder
PCB mounting for Power switch and fuse
PCB USB and DB9 socket.
Additionally, a red/green T/R LED, tywraps- heat shrink tubing, tywrap mounting adhesive blocks, additional connectors, plastic feet and a front stand for tilting unit.
WHAT A VALUE FOR THE MONEY!!!!- silk screened case, shielded metal construction, all the extra's you need to complete the build!!!

Now- let's mention the packing.. Mine arrived DHL unpacked as follows:
TYVAC DHL envelope- India to Kansas 3 Days. 0.5 Kg weight
Unit was DOUBLE wrapped in small air bubble sheets, completely encased in clear 2" wide clear tape..amounted to 3/4-1 inch bubble wrap all sides.
Once 2 layers of bubble wrap was removes the unit was encased in a high density stryafoam box with 1/2 thick sides and taped shut.
Upon opening the Styrofoam box, the case was then neatly wrapped in a plastic bag.
The uBITX case was finally exposed but required unscrewing the top cover to continue unpacking.
Inside the box double wrapped in newspaper is a ziplock sandwich bag filled with all the small accessories included it the price.
Some of the items (the Display Window) were protected in yet another layer of newspaper.

1. QUALITY of CASE                                                    * * * * *    5 stars
2. Professional Appearance                                      * * * * *    5 stars
3. Additional components to complete build          * * * * *    5 stars
4. Additional PCB's included                                     * * * * *    5 stars
5. STURDYNESS OF  CASE                                         * * * * *    5 stars
6. PACKING QUALITY                                                  * * * * *    5 stars
7. VALUE of purchase                                                * * * * *    5 stars
8. Will I buy Again?                                                     * * * * *    5 stars
9. Will I recommend?                                                 * * * * *    5 stars

God love all the other case builders, and those that "roll" their own..Better men than I.  This is the ROLLS ROYCE STANDARD you need to consider. Especially recommended for a  group- club builds when replication and quality is desired.

Respectfully Submitted-
Larry W8LM
ARRL Life Member - Licensed 52 Years.
Past President, 2 terms -VFW post 3115 Amateur Radio Club, WØVFW -Wichita, KANSAS

If you are reading multiple variables, such as forward and reverse
power, then it becomes a big question of resources on-chip vs resources
off-chip.

For instance, I want to read PA current and reverse power. That's two
analog ports on the nano vs none for an i2c peripheral. If I also want
forward power then it becomes three analog ports vs none for an i2c
peripheral. If I also want PA temperature then it's four analog ports
vs none for an i2c peripheral. Reading multiple analog ports through
the nano muxed ADC doesn't appear to be much faster than doing i2c
reads from peripherals.

tim ab0wr

On Sun, 6 May 2018 22:15:37 -0500
"K9HZ" <bill@...> wrote:

If you are only reading one variable, it’s much better to use the

Nano’s A/D.  There is no syncing to do… just let it run continuously

and read whats ever in the register.

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 <http://www.villagrandpiton.com/>

Like us on Facebook!  <https://www.facebook.com/VillaGrandPiton/>

Moderator – North American QRO Group at Groups.IO.

email:   <mailto:bill@...> bill@...

From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of Jerry

Gaffke via Groups.Io Sent: Sunday, May 6, 2018 9:39 PM

To: BITX20@groups.io

Subject: Re: [BITX20] SWR

Here's the datasheet:

   http://www.ti.com/lit/ds/symlink/ads1015.pdf

Pages 20-23 are of interest.

Looks to me like it is on the order of 10 bytes transferred via the

i2c bus for each ADC read, since we have to switch channels between

reads to choose forward vs reflected power. At 100 khz, that's 10us *

10 * 8bits/byte = 800 us. That's an order of magnitude slower than

reading the Nano's ADC using a an analogRead() call, around 100us.

It is possible to speed the i2c bus up from 100 khz to 400 khz,

But we can speed up the Nano ADC reads by a factor of 5, fiddling

with the ADC clock prescaler.

So using the Nano's ADC is much faster than using this i2c ADC chip

Now if you found a good SPI ADC chip, that might be a different story.

Jerry

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So what would be the minimum compute requirement on an existing Nano ? Maybe read 2 analog inputs directly from 2 AD8307s  with only a scaling factor for Stockton Bridge coupler loss. Multiply that by 1dBm per 25mV (linear spec for the AD8307) and you have the Forward and Reflected power in dBm into a 50 ohm load.  Look up the "power" in Watts or tape a small chart on the bottom of the uBITX.