[GreenKeys] M28 features for RTTY operation today?
Nick England
navy.radio at gmail.com
Mon Feb 25 08:36:08 EST 2019
Thanks for the info. I really do appreciate getting experienced advice.
Nick
On Mon, Feb 25, 2019 at 8:04 AM Russ Miller <wa3frp at gmail.com> wrote:
> Hi Nick,
>
> MMTTY has two options that apply:
>
> The first is to send an automatic CR LF at the start of every
> transmission. The other option that can be selected is "word wrap on
> keyboard" That option keeps the letter of a word together when you get to
> the end of a line. However, this is only on the computer screen of the
> transmitting station as the size of the MMTTY window will vary depending on
> how the individual operator has set up his MMTTY window. Neither is a big
> help for a mechanical RTTY machine operator.
>
> The bottom line that always works for me...install "non-overline" and
> "auto CR LF" per the instructions from Irv in RTTY Journal. Remember, you
> can also use the red LOC LF and LOC CR keys if something goes wrong.
>
> Thanks 73
>
> Russ WA3FRP
>
> On Mon, Feb 25, 2019 at 6:13 AM Steve Garrison <steve.n4tty at gmail.com>
> wrote:
>
>> That's what was used during my Air Force days!
>>
>> Steve G./N4TTY
>> Sent from my iPhone
>>
>> On Feb 24, 2019, at 10:05 PM, Ralph Irish <w8roi at wowway.com> wrote:
>>
>> *Going back to my Navy days as a Radio Operator, the 'standard' procedure
>> when communicating*
>> *by Teletype was to type:*
>>
>> *CR CR LF LTRS *
>>
>> *at the end of each line. This assured that the different styles of
>> teleprinters would all*
>> *have their carriage at the left margin and be prepared for the next line
>> of information.*
>> *It had very little effect on 'throughput' and the extra few characters
>> assured, in most*
>> *cases, that the next line would have a 'clean start'.*
>>
>> *When sending things like weather data, with a lot of 'numerical groups',
>> the LTRS character*
>> *may well have been omitted to save the requirement of typing FIGS to
>> get back into Upper*
>> *Case.*
>>
>> *I noted that most hams did much the same, over my years active on
>> Teletype. It was 'second*
>> *nature' to me. CR CR LF LTRS*
>>
>> *73,*
>>
>> *Ralph - W8ROI*
>>
>> *- - - - - - - -*
>>
>> *On Feb 24, 2019, at 5:40 PM, Russ Miller wrote:*
>>
>> *Nick, *
>>
>> *I did a quick check with MMTTY - which is one of the most popular
>> freeware applications for sending and receiving RTTY using a computer. *
>>
>> *MMTTY send CR LF when the "enter" key is pressed.*
>>
>> *Hope that this helps! See you on-the-air 73*
>>
>> *Russ WA3FRP*
>>
>>
>>
>> *On Sat, Feb 23, 2019 at 4:51 PM Ralph Irish <w8roi at wowway.com
>> <w8roi at wowway.com>> wrote:*
>>
>>>
>>> *What a lot of 'Irv's enemies' didn't know was that after a few paper
>>> run outs, Irv came up*
>>> *with a stunt box fix that would not allow multiple LFs to take place
>>> unless some number of*
>>> *printing characters had been sent. So, some clown would sit there and
>>> type endless LFs,*
>>> *laughing all the time, not knowing that in most cases, Irv was sitting
>>> on his end, laughing*
>>>
>>> *even harder as the machine cycled and only one or two line feeds were
>>> accomplished.*
>>>
>>>
>>> *- - - -*
>>>
>>>
>>> *Not certain of the timeframe, but sometime later, Irv got to borrow
>>> some kind of 'mini-computer'*
>>>
>>> *(Data General comes to mind) and wrote routines to circumvent any such
>>> nonsense. All data *
>>>
>>> *from the TU had to pass through the 'Mini' thence to the Model 28's
>>> Selector Magnet Driver. *
>>>
>>>
>>> *He even wrote routines to make his 'output' have 7.5, 8, 9 and 10 unit
>>> code, with all of the excess*
>>>
>>> *being put into the STOP pulse. This made for some most interesting
>>> 'sounding' mechanical action*
>>>
>>> *from the Teletype, whether it was a Model 28 or 15, etc. Throughput
>>> was still very close to what*
>>>
>>> *it would have been with 7.41 or whatever. I'm certain that the
>>> mathematicians among G/K can*
>>>
>>> *do some number crunching and convert to OPM and come up with some exact
>>> number of WPM.*
>>>
>>>
>>> *Irv was a nice guy, and he was misunderstood by many. I was not 'one
>>> of his biggest fans', but*
>>>
>>> *you have to put credit where it belongs. Without his efforts, those
>>> 100 and some Model 28s would*
>>>
>>> *have been sold by Pacific Bell (or whomever) and never seen by any
>>> hams. You might say that he*
>>>
>>> *was 'ego driven' as are many creative people. His original Mainline
>>> TT/L from the early-mid 60s*
>>>
>>> *was almost a 'giant step' past the W2JAV units very commonly used by
>>> many, back in the 50s*
>>> *through the early 60s. Petersen's 1967 'revamp' called the TT/L-2 TU
>>> was almost as large a 'giant*
>>>
>>> *step' past the original TT/L, and that device won over many hams as far
>>> as striving for near perfect*
>>>
>>> *copy under varying band conditions. There were PC Boards made for most
>>> of the circuitry, and*
>>>
>>> *other PC boards for specific sets of bandpass filters and Mark/Space
>>> channel filters. A fellow in*
>>>
>>> *Texas whose name/nickname was "Curly" made some of these boards, and
>>> sold them for little*
>>>
>>> *profit. He provided manufacturer's part numbers for tube sockets and
>>> terminal strips and other*
>>>
>>> *items for those who wanted a great looking and performing TU. *
>>>
>>>
>>> *Over time, Petersen, with help from some Detroit area 'locals' came up
>>> with part value mods for*
>>>
>>> *the TT/L-2 and those who took the time to make the changes found the
>>> 'error rates' dropping a*
>>>
>>> *bit.*
>>>
>>> *At that time, Truman Boerkel, K8JUG (later K9JUG), worked for a "parts
>>> house" in the Chicago *
>>> *area and put together kits of parts for those who wished to have a
>>> finished unit work as Petersen*
>>>
>>> *wanted it to work. I suspect that there are still many of those 'kit
>>> sourced' TT/L-2 units working*
>>>
>>> *quite well, if they were not allowed to 'sit idle' for decades.
>>> (Nothing lasts forever!!)*
>>>
>>>
>>> *Petersen specified some special switches for the unit, and using
>>> another could have caused some*
>>> *'mode-switching glitches' and less than ideal print. Truman made sure
>>> that the 'house' had the*
>>> *correct spec-ed switches for these kits. (Not talking about rotary
>>> switches, but two and three*
>>>
>>> *position toggle switches.) *
>>>
>>>
>>> *I have very find memories of those days. I was fortunate to find a
>>> TT/L built with all 'point-to-*
>>>
>>> *point' wiring, on a 3" x 17" x 15" chassis, good 19" rack mount front
>>> panel and decent labeling*
>>>
>>> *on the panel. It served me for years. I had it on the summer "East
>>> Coast Autostart" channel,*
>>>
>>> *3637.5 KHz. My receiver was a TMC with crystal positions with
>>> 'hz-shift' of the crystal circuit*
>>>
>>> *for near exact freq setting. It also had a crystal socket for the BFO,
>>> for even better 'on the *
>>>
>>> *cycle' setting of the audio coming out of the receiver to the TU. My
>>> 80M inverted "VEE" was*
>>>
>>> *about 30 feet at the feedpoint and I had favorably located trees for
>>> the ends. One of the best*
>>>
>>> *time of my 'ham radio life' was that time period. I built (and still
>>> have) a simple small chassis*
>>> *crystal oscillator circuit with a piston trimmer that I plugged into my
>>> Heath DX-35 transmitter's*
>>> *crystal socket. By 'zeroing' stations on the air who were known for
>>> their precision, I stayed on*
>>>
>>> *freq, and had only one person ever question my signal frequency. (We
>>> were both off a little bit!)*
>>>
>>>
>>> *Those were the days!!*
>>>
>>>
>>> *73,*
>>>
>>>
>>> *Ralph - W8ROI*
>>>
>>>
>>> *- - - -*
>>>
>>>
>>> *Irv Hoff: K8DKC, Ann Arbor, MI later W6FFC in
>>> California; Military pilot, later airline pilot*
>>>
>>> *Keith Petersen: W8SDZ, Ohio, later Michigan resident. Lived elsewhere
>>> at the time of his passing.*
>>>
>>> * Broadcast Engineer in Toledo, Detroit, and
>>> other employment situations including*
>>>
>>> * Chief Engineer of some TV stations in the
>>> south. (Forgot details.)*
>>>
>>> ------------------------------
>>>
>>>
>>>
>>>
>>>
>>> *From: "Russ Miller" <wa3frp at gmail.com <wa3frp at gmail.com>>To: "Jim
>>> Haynes" <jhhaynes at earthlink.net <jhhaynes at earthlink.net>>Cc: "Greenkeys"
>>> <greenkeys at mailman.qth.net <greenkeys at mailman.qth.net>>, "Nick England"
>>> <navy.radio at gmail.com <navy.radio at gmail.com>>Sent: Saturday, February 23,
>>> 2019 2:59:36 PMSubject: Re: [GreenKeys] M28 features for RTTY operation
>>> today?*
>>>
>>>
>>> 1. *Non-Overline for the Teletype Model 28*
>>>
>>>
>>> *On a normal Teletype machine, when someone hits CR, the carriage will
>>> automatically come back but will not turn up a new line. This is a nice
>>> feature for RTTY Art but a real problem if you are trying to copy a weak
>>> signal and you are already receiving partially garbled text.*
>>>
>>>
>>> *Fortunately, the Model 28 machines can be easily converted to avoid
>>> overlining. This change requires no new parts and can easily converted back
>>> to factory stock in a few minutes.*
>>>
>>>
>>> *Here are the steps to make the change:*
>>>
>>>
>>>
>>> 1. *Remove the roll of paper*
>>> 2. *With the motor running, look at the top of the stunt box.*
>>> 3. *Hit the CR key and some slot will show activity. This should
>>> be slot 5, counting from right to left as you stand in front of the
>>> machine.*
>>> 4. *Hit the LF key and two slots should show activity. These
>>> should be slots 38 and 40, counting from right to left as you stand in
>>> front of the machine.*
>>> 5. *Leave slot 40 alone.*
>>> 6. *Remove the LP and take out the stunt box (after disabling all
>>> power).*
>>> 7. *Swap the universal code bars in slots 5 and 38 and reassemble
>>> the machine.*
>>>
>>>
>>> *Now, when the CR key is pressed, nothing happens. When the LF key is
>>> pressed, both CR and LF occur at the same time.*
>>>
>>>
>>> *You will still have to hit the CR key when you are transmitting. The
>>> CR character still needs to be sent to the distant machine. It may seem
>>> awkward to type the CR key and have nothing happen. But, the simplicity of
>>> this change, the fact that no additional parts are needed and that it works
>>> so well are huge benefits.*
>>>
>>>
>>> *I hope that this helps!*
>>>
>>> *Russ WA3FRP*
>>>
>>>
>>> *On Sat, Feb 23, 2019 at 12:36 PM Jim Haynes <jhhaynes at earthlink.net
>>> <jhhaynes at earthlink.net>> wrote:*
>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> *I've forgotten the details, but one of the changes was because some of
>>>> Irv's enemies were starting up his machine on autostart and sending
>>>> continuous LFs to run all the paper out on to the floor. Auto-CR-LF is
>>>> obviously good for radio because if you miss a CR or a LF you lose a line
>>>> of print. And if you get a CR without a LF you lose a line of print.
>>>> (Altho there were some TTY pictures where being able to overstrike was
>>>> essential) If people using computer-emulated TTY are failing to send proper
>>>> end of line characters then you aren't required to be able to receive from
>>>> them. An electronic regenerative repeater is always good with a mechanical
>>>> Teletype because of the problem of false starts and missing stops that
>>>> result in several errored characters. --- "Ya can argue all
>>>> ya wanna, but it's dif'rent than it was." "No it ain't! No it
>>>> ain't! But ya gotta know the territory." Meredith Willson,
>>>> The Music Man *
>>>
>>>
>>>
>>>
>>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
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>> --
Nick England K4NYW
www.navy-radio.com
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