Re: Antenna Impedance Confirmation
It's on Don's website at ND6T.com
I may not be able to get some sort of visual indicator attached to it but the basic circuit and how it works is on Don's website.
73 Kees K5BCQ
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Re: Antenna Impedance Confirmation
Where do I find the circuit?
73, Dennis
W7DRW
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Re: Antenna Impedance Confirmation
Kees,
I'm fairly new to the BITX group and never heard of his idea. Thanks for bringing it up again. I have always listened to the background noise to do my rough tune but like the idea.
73 Bill WA8VIH/4
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Re: RadI2Cino - I2C replacement kit for the uBITX Raduino Now with Teensy 3.6 adapter
#ubitx
Well, we NO LONGER have any of the Teensy 3.6 Adapter board kits. ?They are now all gone. ?Thanks to everyone who bought the kits.
Jim Sheldon, W0EB
------ Original Message ------
Sent: 5/10/2018 9:14:43 AM
Subject: [BITX20] RadI2Cino - I2C replacement kit for the uBITX Raduino Now with Teensy 3.6 adapter #ubitx
We still have some RadI2Cino (I2C replacement card for the Raduino) kits available and are sweetening the pot a little by including at no extra charge an adapter card that will allow the use of a Teensy 3.5 or 3.6 (preferrably the 3.6) to be used in place of the Nano.? This offer will stand until the supplies of TeensyDapter cards are exhausted and at that time it will be withdrawn.
._,_._,_
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Antenna Impedance Confirmation
I'll make one more pass over the target................can't seem to get any interest on other threads.
As far as a quick and easy "Antenna Confirmation", I still like that little circuit Don, ND6T, came up with....and maybe others out there. Just a broadband noise generator and tune for the null with the receiver part of the Transceiver. No meters, no digital values to convert (which may or may not be correct) ....just a subjectively monitored "noise dip" as you tune the receiver while the noise generator is activated. If you are in the "dip", great, hit the PTT, ......if the dip is off frequency, just retune until it's on frequency. A bit different, a bit unusual, but very inexpensive and located under the covers of the BITX with no Nano code change required.?
Might be able to add a red LED to provide "null" feedback to reduce the subjectivity.?
I've discussed installing it under the covers (vs externally) with Don and he tried it on his BITX-40 and says it works well.?
73 Kees K5BCQ
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Re: I find this hard to believe.....
I was almost afraid to open the package because I was thinking I might find a small brick or something in it.
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Re: Thunderbolt and lightning, very, very frightening me
Hi Jerry, what you are describing is called a Ufer Ground.? Here in Olathe Kansas they are code.? Not sure but I believe it also requires all the rebar in the foundation to be tied together.
73, Bill? N0YUD
Concrete is apparently conductive enough.
A really good ground can be had by tying into the rebar (steel reinforcement bars)
embedded in a basement wall or the footing of a building or a concrete slab for a patio.
Something to keep in mind if ever doing new construction.
Maybe even worth digging a bit into the concrete of an existing structure,
assuming you don't compromise it structurally or create a groundwater leak.?
Jerry
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On Wed, May 9, 2018 at 08:25 pm, Robert Alexander wrote:
Just what does any of this have to do with the bitx or units radios
Who cares? It's a great trip down memory lane for many of us! ? -- John - WA2FZW
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On Thu, May 10, 2018 at 07:11 am, Jerry Gaffke wrote:
An important part of communicating better.
And I was always under the impression?that hams are always trying to communicate better! Did I miss something here? ? -- John - WA2FZW
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Re: an open message to those unhappy with the volume of messages
#off_topic
There are probably a few optimizations a human can make that would be missed by a compiler, but most probably aren't worth the effort. I've done that binary stuff and if you value your time at more than a penny and hour, IDE's are worth it.
Jack, W8TEE
On Thursday, May 10, 2018, 2:38:37 PM EDT, Jerry Gaffke via Groups.Io <jgaffke@...> wrote:
Ah, you clearly missed the point.
All those editors and compilers and stuff are sissy too.
They were hand coding binary bits into those transformers.
Got us to the moon!
Haven't been back since.? ? ;-)
I've often heard from people who insist on coding in assembly, though not so much anymore.
And vaguely recall somebody advocating machine code as the way to go if you want to keep it really tight.
I very seldom find any reason to use anything less than C, even on small machines.
Jerry
On Thu, May 10, 2018 at 11:14 am, Jack Purdum wrote:
What? I think IDE's make life easier. Those who want to use discrete editors, compilers, assemblers, and linkers are welcome to it. I prefer to be a sissy.
?
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Re: best way to solder ISP header pins to NANO board?
#nano
#arduino
Wow! Not a simple task considering how close
the Nano is to the pc board.
Probably the best (easiest) way is to solder a six-conductor wire
and lead that out to a six-pin connector. Color code it so that red
is V+ and Black is ground.
Note that Avrdude and Avrdudess will knock out the boot
loader if used to load new software. Their first task is to wipe clean
the entire memory space of the mCu. You must take special pains to
avoid that if you are ever going to use a USB loader again.
The square hole is pin1. The pins are stagggered, i.e., they run
1-3-5 and 2-4-6.
2 4 6
1 3 5
The rest is a standard ICSP header.
john
AD5YE
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Re: an open message to those unhappy with the volume of messages
#off_topic
Very cool.
Imagine how many times that code was looked over for bugs.
Of course, Armstrong found one.
? ??
? ??
Hang in there, these guys are working on a fix:
? ? https://github.com/chrislgarry/Apollo-11/issues/23
Jerry
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On Thu, May 10, 2018 at 11:43 am, Doug W wrote:
Original Apollo 11 Guidance Computer (AGC) source code for the command and lunar modules.
?
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Re: I find this hard to believe.....
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On Thu, May 10, 2018 at 3:25 PM, <n2tmc@...> wrote: I order things that come from China and it takes 4 or 5 weeks. I ordered a radio from India and it gets shipped on the 8th and comes on the 10th.
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Back in the 80s I constructed a "computer brain" in kit form, to
control the key matrix of a synthesizer keyboard, also in kit form.
It was capable of some neat tricks at the time, like programmable
arpeggiation, set chords, MIDI transforms, etc. It had a 1K memory,
as I recall, and a number keypad made up of actual metal pads painted
over. You programmed machine code into it, nothing higher, pressing
into the pads with your finger; I had to hold a cold water pipe with
my other hand in the Wintertime to make it recognize my touch.
Entering the machine code letters one at a time from pages and pages
of it printed in Polyphony magazine absorbed much of my waking
hours... -- Rich WB2GXM
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On 5/9/18, ajparent1/KB1GMX <kb1gmx@...> wrote: COSMAC ELF,? Built mine back '76.
12 switches, 1 push button, 2 hex digits of led, 256bytes of ram and the
1802, 8 pieces of CMOS logic.
I still pull it out to play.? Runs well on a battery of 8V or more.
Also National SC/MP (both I and II), Texas Inst 9900 in the form of the
Technico starter board, 6800D1,
Kim1, TK80, Intersil 6100 Sampler (base PDP-8 in cmos), IMSAI IMP48
(intel8035), Intel SDK85 and
then memory fails me. There is a 6809 in there too.
My favorite is a 16 bitter made from TTL...? I decided I needed to
understand how computers
worked at?the gate level. So design and build.? Not very fancy but proved I
understood.? Killed
me wirewraping it too. The hard part was getting the carry logic right.? It
was sorta PDP-8 /nova
in its origins.?Also proved that once you have a machine... programming
happens, mostly by
need as it was unique.
Allison
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Re: an open message to those unhappy with the volume of messages
#off_topic
Must have been before my time.
Can't remember those marbles at all.
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On Thu, May 10, 2018 at 11:49 am, Kees T wrote:
Back when men were men, ships were made of wood, men were made of steel, and electrons were the size of marbles.
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I find this hard to believe.....
I order things that come from China and it takes 4 or 5 weeks. I ordered a radio from India and it gets shipped on the 8th and comes on the 10th.
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Re: an open message to those unhappy with the volume of messages
#off_topic
electrons the size of marbles, and the number one tool, the most well worn tool, the first tool I reach for in the top of my tool bag that I was issued both bag and tool…..to work on RF and Computer, and Microwave…..was a BALL PEEN HAMMER…..the greatest finesse tool for vacuum tubes or for those of you who rather…..valves….and cannon plugs….
and the computer interface was toggle switches and 28 volt lamps…..and the hard drive sounded like a Saturn Five…..
and uniforms had starch in them not static…..
thats when things were big and the big things they did then aren’t much compared to today…..
I miss my hammer…
I still use a upside down nut driver to tap for cracked solder….
Craig KM4YEC
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Back when men were men, ships were made of wood, men were made of steel, and electrons were the size of marbles.
73 Kees K5BCQ?
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Re: an open message to those unhappy with the volume of messages
#off_topic
Don't you mean that we have gone from an age of wooden ships and iron men to composite ships and synthetic persons (must be P.C. here).
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On Thu, May 10, 2018 at 11:54 am, <Kd4epg@...> wrote:
take a look at this.
at what? pse provide a link to the product - tks Allard 73 PE1NWL
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take a look at this. Buy it as a kit or finished product. I bought one. It works very well on most antennas I have used. One of the keys is to have the correct balun or Unun for the antenna. I did have to replace the toggle switch, which seems to be a common problem with these kits.... other than that, works great for up to 20 watts.
72 and God bless
KD4EPG
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Jim Sheldon
Craig Thibodeaux
Allard PE1NWL