Two radio SO2R operation with CW Keyer/N1MM+.Dual-mode CW and RTTY with fldigi and nanoIO.NEW* Simple Plug & Play installation and operation.NEW* AUX I/O feature for CW monitor tone or a pushbutton or ?.NEW* Four status LEDs – power, PTT, CW-r1 or TinyFSK, CW-r2 or nanoIO FSK.NEW* CW speed pot standard on Mortty v4.The output end has a CW speed pot four LEDs for power, push to talk (PTT), Radio 1 and Radio 2 transmit and a 3.5mm TRRS output jack that provides PTT, CW and FSK signals to your transceiver.Ĭompare the Mortty v4 CW and RTTY Keyer to the Competition: The input end has a USB mini-B jack to connect a computer and a 3.5mm TRRS jack to connect a CW paddle. This tiny box measures only 2 inches long and 1 inch square (50mm by 25mm). Unlike full-featured – and more expensive – hardware solutions for CW and RTTY keying that are widely available to amateurs, Mortty is an inexpensive solution that depends upon the configuration and control features incorporated in popular logging and control programs. Thanks to Klaus and Pat for their respective inputs.Mortty v4 is a fully assembled and tested keying solution that provides a miniature enclosure and a computing platform for three freeware keying programs: K0SM’s TinyFSK RTTY Keyer, K3NG’s CW Keyer, or W1HKJ’s nanoIO dual mode program. Observations for the above were achieved using Spectrogram V5. Where this has an influence on." comment, this seems to be confirmed in our recent observations. To compensate for this the R75 must be detuned by -85Hz, or the decoder CF readjusted to equal the appropriate centre from the R75 "actual" table.įinally, and further to Klaus's "In a further setup entry, you can select RTTY shift between 170, 200 and 425 Hz. Low tones 1190 1275 1360 R/Amateur standard High tones 2040 2125 2210 R/Amateur standard Here the selected RTTY MARK= selection does NOT result in a MARK+85HzĬentre frequency offset of the Mark/Space tones but the selected MARK value becomes the centre of the received pair ie the output produced in
So far so good but now we meet the anomaly in the R75 design.
2 TONE RTTY PRO
Also if one uses the RTTY/NAVTEX text modes of JVcomm32 and MScan Meteo Pro the center frequency Has been a popular value on maritime modems. In my case, for both the NRD545 and the NRD535, JRC offer the center frequency (there is only one setting) of 2210Hz.īut what is third option **** tones? For want of a definative name one might call it maritime tones.
In the case of the R75 ICOM differentiates between the three by giving the RTTY MARK value in user SET mode (RTTY MARK= 2125,1275,orġ615). Low tones 1275 1360 1445 R/Amateur standard High tones 2125 2210 2295 R/Amateur standard Let's look at the "standards" table for NARROW shift Radio amateurs tend to have a fixed value for the MARK and a variable value for the SPACE being
2 TONE RTTY PLUS
High and low tones are offered, plus a third which will be discussed later. In some receivers (eg my NRD545) there is no option and the value is fixed at the more marketable (in USA) high tones. Published 1984 things may have changed in that everyone may now be using high tones. There is also a "low tone" standard more popular in Europe - that is from an American book. "High tone" standard are used almost exclusively in the American continents (and many other areas). In the world of amateur radio digimodes use is made of the terms high tones and low tones. The decoder CF must equal the standard selected or provided. The receiver will produce tones based on recognised "standards".
Recent emails and some experiments with/by Patrice Privat have clarified and revealed what is considered a design Select RTTY shift between 170, 200 and 425 Hz. "RTTY mark frequency" can be selectedĪpparently this is also the center frequency. I admit that I don't understand the settings. Is it fixed at the usual (hi-tones) 2210Hz? If two options what is the BFO/CIO offset options for CW. Last year, in response to some correspondence on the ICOM R-75, Klaus Betke sent the following:ġ.