/diy/ - Do It Yourself

Okay so I'm finally setting up for HF (got a used and working IC-718 for a good deal, just waiting on a power supply) and I don't get grounding.

Here it shows everything hooked up to to a single strap that's then grounded out.
http://www.dummies.com/programming/ham-radio/how-to-ground-power-and-radio-wave-frequency-in-your-ham-radio-shack/

But here it says that doing that causes problems and I should ground everything to a single point instead.
http://kc.flexradio.com/knowledgebasearticle50426.aspx

>>1023132
>To begin with, do you really need to transmit strings instead of single characters like 'y' or 'n'? If yes, do you really need to transmit variable-length strings?
^^^This is a very good point.
Using plain ASCII codes is convenient but is wasteful since they aren't arranged ideally for a small-footprint microcomputer system.

For that matter: ASCII uses 256 codes, but you don't need all of them, and you don't need to use 8 bits just to use all of the 'good' ones either.
Some of the ASCII set is non-printing and some of it is DOS-related stuff that is rarely ever used now, so you can leave it out and lose nothing of value.
For the rest of it, you could separate the remaining characters into four banks of 64 codes.

Place the most-used characters in the first bank (lower-case letters, digits, some punctuation, an [end-of-message] character, an [uppercase] letter to allow shifting letters to uppercase, and a [bank] code to allow switching to different banks.

To designate a character in the first bank, you just send-
[the 6 bits for that character]

To designate a character in the second, third or fourth banks, you just send the [#bank] code once, twice or three times, and then the 6-digit code of the character you want in that bank.

So now---
1. All the most-common characters that you will need will only require sending 6 bits to use, since they're all contained in the first bank.
2. Some of the more-rare characters would require 12 bits to use
3. Almost all of the rest of the ASCII set would still be available, but it would take 18 or 24 bits to use them--but you may never use them anyway.
4. In normal text most letters are lower-case, so you just have a [shift-up] character to place before each letter you want capitalized.
5. If *I* wanted to send variable-length messages, then I would create a character that represents the end of the message.

>>988088
do you mean a PA-style amp, or a preamp? two rather different things....

>>918619
>What androids are the cheapest and best for rooting and use of hacking?
what specifically do you want to do with them?

you can buy unlocked GSM phones from China-land for $30, maybe not US radios but anyway.
and there's cheapo "unlocked" android 7" tablets for $40.... not great durability but anyway
you can put any app on them you want, no rooting needed

>>908536
>- could just as well say, mug a postman, thats free shit as well -
...or build a drone to mug postmen... ?

>>857242
>Whats the deal with this
This is like many other videos on 'alternate energy'--in that it involves a person fascinated with some side effect of physics, and they lack the knowledge and the equipment to measure the actual efficiency of the entire system they have constructed.

> is there low resistance for magnets on passing copper wire so you need low power motor making this better or what ?
No, not really.
In fact it would be better to use nichrome/kanthal pipe, as it is more-efficient at heating up with electrical current. But pipe made from that prolly costs one zillion dollars.