For those of you looking for a relatively simple and inexpensive method of doing 45 and 75 baud RTTY using logical keying ("FSK") you can have a look at a TX-only modem that I built that will accom
For those who have not tried Arduinos before, they are single board Atmel AVR microprocessors which include their own bootloaders. Arduino has a free program (runs on Windows and Mac OS) that combine
The Nano that I'm looking at has different pin numbers for the functions listed on the page below. Is this a problem? Looks like a cool little project for us FSK purists. Thanks 73 Jim W7RY On 10/10/
The current Arduino Nano from Italy, and two Chinese knockoffs that I know of, have the same pin outs as the schematics in Andy's document. The Nano's RX pin is also Data pin 0 (D0) and its TX pin is
Thanks Chen... The schematic for the 'knockoff' one I found on EBay is the exact same schematic I just downloaded from the Arduino site. Go figure! BUT pin the D13 line is shown as pin 16 on Andys dr
ORIGINAL MESSAGE: (may be snipped) REPLY: What does this do that MMTTY and a pair of one-transistor drivers for FSK and PTT does not do? 73, Bill W6WRT _______________________________________________
Jim, Be careful when counting, as there are empty holes on the corners with no pins in them--I think that might be the source of the numbering issue, no matter which one of us didn't count right.
Nothing ... IF your computer has real, i.e., with good UARTs, hardware serial ports., or you use a USB-Serial converter such as the Edgeport units with real UART components. However, many people use
I see what the issue is. The pin out shown on your schematic is not the chip. It's the external interface pins on the board itself. The schematic just shows the pins on the chip, not the interface pi
ORIGINAL MESSAGE: (may be snipped) REPLY: I hadn't realized there was such a problem. I do have a more or less conventional PC with a pair of PCI boards with com ports so I don't use any USB to seria
EXTFSK produces timing jitter that can make the signal harder to decode, depending on many aspects of a given situation, such as weak signal strength, QRM, QSB, QRN, etc. It works, just not as well a
However, many people use standard consumer-grade USB-Serial converters without true UARTs and they therefore require the EXTFSK optional module for MMTTY to provide correct Serial timing. Not quite c
So which is it? EXT FSK or hardware? 73 Jim W7RY However, many people use standard consumer-grade USB-Serial converters without true UARTs and they therefore require the EXTFSK optional module for MM
I don't understand the question. Traditional serial ports - even the internal expansion cards and the Edgeport devices work just fine with no special drivers. microHAM's "Keyer" products do stable FS
I will let others desribe the features that Andy's implementation provides. Let me provide some "color" to why it is important. Two things that Andy addressed are the non-constant (jittery) bit rates
Bill asked: and PTT does not do? Hi Bill, Here's a concrete example if it will help. I have a note here from Jun 7 of this year that I observed W6WRT with a stop bit length consistently at 37ms.
What does this do that MMTTY and a pair of one-transistor drivers for FSK and PTT does not do? Hi Bill, Here's a concrete example if it will help. 2Tone is a tool that can help you see what you are
It's always there.. most rigth figure in the status line of the spectrum display.. you may need to tick 'On Top?' in the upper setup pulldown menu to see this window.. well, I've measured my setup th
ORIGINAL MESSAGE: (may be snipped) REPLY: I checked my MMTTY stop bit settings and it is set to RX = 1 stop bit, TX = 1.5 stop bit. That is the default, I'm pretty sure, since I have never changed it
Well I was curious so I measured what I get. All identical settings in n1mm/mmtty Afsk. 33-34 ms FSK motherboard based com port. 33-34 ms FSK 8 port edgeport USB adapter. 46-48ms! And you know it doe