Interruption of the loop current releases the selector magent, allowing rotation of a cam in the machine. In a teleprinter machine, the normal "rest" condition of the selector magnet solenoids is with the loop current on. Letters, numbers, and symbols are encoded by different combinations of mark or space pulses. Rather, the TTY codes use equal time length pulses which can be set to either mark or space. However, the TTY codes differ from telegraph codes in that variable length mark or space conditions (dot, dash, and spaces between them in telegraph codes) are not used to from the character. Following the convention of telegraph recording, the current-on condition of the signal circuit, or loop, is called the mark state of the TTY signal and the current-off condition is called the space. Teleprinter machines also use solenoids (called Selector Magnets) that open and close in response to a signal current ( Loop Current). Some strip-pen telegraph recorders are still to be found in use today.
#HAM RADIO RTTY EQUIPMENT CODE#
One "tale" has it that the strip recording came first in telegraph operation and was used until the operators discovered that they could mentally decipher the code by listening to the rythem of the mechanical sounder. Of course, an operator familiar with Morse code would then have to read the tape. The pen was solenoid operated so that the pen was lowered when the sending key was down, marking the moving strip keyup time was represented by the blank space between marks. The terms mark and space date from early pen and moving paper strip recording of telegraph signals. However, current usage associates mark and space with something RTTY'ers do to or with machines. To be fair, these terms really are not unique to RTTY since they originated with land-line telegraph service before 1900. Chief amoung these are the words MARK and SPACE.
![ham radio rtty equipment ham radio rtty equipment](https://i.ytimg.com/vi/g3VbeuTIgRk/maxresdefault.jpg)
Newcomers to amateur radio RTTY soon discover a whole new set of terms, unique to RTTY equipment. This paper discusses the differences between the two codes, provides some definitions for RTTY terms, and examines the various interfacing standards used with ASCII and Baudot terminals. Effective March 17, 1980, radio amateurs in the United states have been authorized by the FCC to use the American Standard Code for Information Interchange (ASCII) as well as the older "Baudot" code for RTTY communications.
![ham radio rtty equipment ham radio rtty equipment](http://1.bp.blogspot.com/-hmcAeXB6Th4/UHkB1KxgWHI/AAAAAAAAA0k/_DEIWkJ1Qmw/s1600/IMG_2278.jpg)
The 1970's have brought a revolution to amateur radio RTTY equipmant and techniques, the latest being the addition of the ASCII computer code. This is the correct setting for operating RTTY FSK in DM780.ASCII, BAUDOT AND THE RADIO AMATEUR ASCII, BAUDOT AND THE RADIO AMATEUR George W. Back on the Main window click on “Reverse”.
#HAM RADIO RTTY EQUIPMENT PRO#
RTTY tab, check FSK Keying Enable, the correct COM Port for keying (as above in CW) and tick the radio dial “Rigblaster PRO (TX, DTR), Icom (DTR) etc….Under Modes + IDs, if you want to use CW via the USB cable choose the COM port that is used for keying.In DM780 Options, the Soundcard is your USB Audio CODEC.Take a look at the screen captures for the 73.
![ham radio rtty equipment ham radio rtty equipment](https://g3rcq.com/g3rcq/wp-content/uploads/DSC02756.jpg)
More on that here, Ham Radio Deluxe Panadapter Note: We need to use a USB cable for rig control if we want the HRD Panadapter. Using two cables was always preferred by me, but since HRD will have a working and useful Panadapter someday, I suggest getting familiar with something like VSPE if you have the Icom 7300. I have an article using two cables, Icom 7300 HRD 6.3 DM780 RTTY FSK CW.