[GreenKeys] Two very newbie questions

Tue Jun 18 12:47:34 EDT 2019

Do it like a FAQ?

e. g.

Q: Why do they say mark and space:
A: Historically ..... etc.

No, I'm not volunteering to do it, but would try to contribute.

John, W9DDD
Ich habe dreimal abgeschnitten uns jetzt zu kurtz. (I cut it off 3 times 
and it's still too short.)

On 6/18/2019 10:58 AM, Paul Heller wrote:
> Hey Joe. You are asking lots of questions and getting lots of answers. 
> How about collecting all this into a document for “newbies”? Sort of an 
> introduction to teletypes?
> 
> I could put it on RTTY.com <http://RTTY.com>.
> 
> Paul
> W2TTY
> 
> ITTY: HTTP://INTERNET-TTY.NET:8000/ITTY <http://internet-tty.net:8000/ITTY>
> AUTOSTART: HTTP://INTERNET-TTY.NET:8030/AUTOSTART 
> <http://internet-tty.net:8030/AUTOSTART>
> EUROPE: HTTP://INTERNET-TTY.NET:8040/EUROPE 
> <http://internet-tty.net:8040/EUROPE>
> 
> On Jun 18, 2019, at 7:50 AM, Thomas Tillson via GreenKeys 
> <greenkeys at mailman.qth.net <mailto:greenkeys at mailman.qth.net>> wrote:
> 
>>
>> *Hi Gang:*
>>
>> *First, where/ does/ the bell mount in a Model 28 ASR and where is it 
>> electrically connrected to? *
>>
>> *The bell mounts **underneath**inside the bottom **cabinet**door. (See 
>> attached) A lot must be removed in order to install this correctly.*
>>
>> *However, it may be mounted anywhere inside the **cabinet**in an 
>> **unauthorized**quick dirty fix in any place that is convenient.*
>>
>> *The connections are 29-30 on the C block*
>>
>> *☠️ CAUTION this is 110 AC. Use proper **precautions**.*
>>
>> *Tom WB2TTY*
>>
>> *<IMG_0197.jpg>*
>>
>> In a message dated 6/17/2019 11:59:12 PM Eastern Standard Time, 
>> greenkeys at mailman.qth.net <mailto:greenkeys at mailman.qth.net> writes:
>>
>> Hi Again!
>>
>> Today has been a red letter day! First, I have got a line on a Fox 
>> Box! Yes, an honest to gosh electro-mechanical foxes generator. I hope 
>> that this works out. It will be neat to generate foxes without having 
>> to hand type and perf a tape. I cannot seem to type Quick Brown Foxes 
>> ten times in a row without a typo. Also, I received a brand new Model 
>> 28 bell for the ASR today, and several image tapes of Snoopy to 
>> demonstrate the capabilities of my teletypes. Thank you! You know who 
>> you are. I truly appreciate this.
>>
>> Now, I have two very newbie questions even though I have had these 
>> machines for years.
>>
>> First, where/does/ the bell mount in a Model 28 ASR and where is it 
>> electrically connrected to? Google has not been my friend on this.
>>
>> Second, back to a basic loop question. I have always thought of the 
>> loop as a current device... that is, when current flows, the selector 
>> electromagnets pull the little thing in and that is what starts the 
>> mechanical process of generating data. Now, is Mark when current flows 
>> and Space when there is no current?
>>
>> Part B to the second question... I never thought of the loop being a 
>> voltage device. Yes, I know that there is a rather stiff voltage to 
>> push the current through the loop wires and electro-magnets, and that 
>> the loop must be energized. Now, I am studying the manuals for a FSK 
>> unit (military), and there are two options to key the unit: a) 
>> shorting two terminals together, which would require a relay in series 
>> with the loop; and b) by applying voltage from the loop on another set 
>> of terminals. So is the Mark considered "positive" and the space 
>> "ground state"? So this particular FSK device has two methods of 
>> keying, either shorting one set of terminals together (via a relay) or 
>> by connecting the TTY loop directly to another set of terminals, one 
>> being "positive" and the other "ground". Even though the relay set up 
>> is more complicated, I think that it would be actually easier to 
>> implement as I would not have to figure out what wire is "positive" 
>> and what is "ground".
>>
>> Part C to second question... what type of relay should I use so that I 
>> do not bog down the loop?
>>
>> Eventually, I want to have a regular um, "QSO" (with another amateur 
>> to keep it legal), but that anyone can listen to. I can "call him" on 
>> the air and "send him" the content, and he can respond at the end if 
>> he wishes, but it would be more like a bulletin. I have been talking 
>> with a friend of mine about this so that way, I can argue that it is 
>> not a broadcast, but a rather a QSO.
>>
>> Any thoughts on any of this?
>>
>> Thank all of you so much!
>>
>> Best,
>>
>> Joe KB0TXC
>>
>> <IMG_0197.jpg>
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> 
> 
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