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@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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>
--
Jim K0XU
jim@rhodesend.net
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