[RTTY] will a USB-Serial converter work for FSK and MMTTY

[Joe Subich, W4TV]

> Let's see, 2 x 3904, 2 x 1K resistor, db9 plug& housing, $3-4
> dollars worth of cable, a dab of solder. I guess if you include the 2
> serial cables the whole thing might run to $20.

All of which ignores radio control (CAT, software PTT), any means of
receiving (sound card), support for FSK with fldigi (pseudo-FSK),
support for CW with fldigi (q-CW), or even the basic UART function.

73,

    ... Joe, W4TV

On 8/23/2011 3:16 AM, Jim Rhodes wrote:
> Let's see, 2 x 3904, 2 x 1K resistor, db9 plug&  housing, $3-4 dollars worth
> of cable, a dab of solder.  I guess if you include the 2 serial cables the
> whole thing might run to $20.
> Seems my time is worth about $400 an hour cause it took less than 30 min to
> build. Fits in my pocket, works all modes, works with all the software I
> have.
>
> On Tue, Aug 23, 2011 at 12:25 AM, Joe Subich, W4TV<lists at subich.com>  wrote:
>
>>
>> That depends on whether you also require a CAT/CI-V interface to the
>> transceiver, a sound card for decoding RTTY, and are willing to settle
>> for FSK only (ignoring any digital mode except FSK RTTY).  If one
>> already has an available serial port with the necessary TTL/inverted
>> TTL/CI-V/RS-232 level converters and an available sound card, a simple
>> USB-Serial converter with resistor and transistor or optoisolator
>> drivers will work.
>>
>> However, if one does not already have the necessary hardware, all the
>> parts will cost anywhere from $100 - $200 or more (two USB-Serial
>> converters, a sound card, project boxes, isolation transformers,
>> transistors, resistors, pots, connectors, etc.).  You will end up with
>> three devices, three project boxes (CAT driver, FSK/PTT/CW driver,
>> sound interface) and and a rat's nest of cables ... and not have
>> all the capabilities of an entry level commercial product.
>>
>> Sure, one can build their own interface ... but what is your time
>> worth?
>>
>> 73,
>>
>>     ... Joe, W4TV
>>
>>
>>
>> On 8/23/2011 1:05 AM, rjohnson wrote:
>>> Yes,  the simple interface would  FB for a lot less money !!!
>>> 73
>>> Bob, K1VU
>>>
>>> At 09:37 PM 8/22/2011, WW3S wrote:
>>>> I've seen conflicting info whether a usb-serial converter will work for
>>>> FSK...some say they baud rate isn't right, nor will it support 5
>>>> bits....planning on building a simple interface and trying one....will
>> the
>>>> ones with the FTDI chipset work? I imagine I'd need both FSK and PTT so
>>>> maybe a dual opto-isolator in a DB9 shell would work?
>>>>
>>>
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