"...and I can not confirm that they will do 5 bit serial or even which chip set
they use."
I wish this old 5-bit concept would die away! This WAS important in the days
when DOS and early Windows software controlled the I/O ports directly. That's
not the case with modern computer Operating Systems.
This hardware requirement (5-bit 45.45 baud) is eliminated when you use the
EXTFSK driver. It moves the bit generation/timing from the hardware port
[either serial or parallel] to the soundcard (multi-media timer). Just about
any USB to Serial adapter will work properly on FSK when you apply the EXTFSK
driver to MMTTY in your computer.
Don Hill, AA5AU has a write-up on his website
http://www.aa5au.com/gettingstarted/rtty_start8.htm showing how EXTFSK is
installed and works as an add-on to MMTTY. Start reading from the third
sentence under "USB-to-Serial adapters".
Writelog makes this capability even more transparent by providing a "Software
generated FSK" option in versions 10.58 and newer. Here's a link to Don's
write-up about using USB adapters:
http://www.rttycontesting.com/softfsk/software_generated_fsk.html
The only caveat with EXTFSK is the driver program requires exclusive control of
the port you decide to use. For example, if you are using COM3 for FSK/PTT,
another program (not even ham radio related - GPS for example) may look for an
external device and scan all available ports. This 3rd party software might not
"release" COM3 properly after its interrogation. The next time you launch MMTTY
the EXTFSK driver will fail to acquire COM3. Of course the possibilities for
COM port contention are endless, but in general a fresh reboot and immediate
launch into MMTTY will circumvent this behavior.
See you in the contests... ryryryryryry...
73 de Bob - KØRC in MN
http://k0rc.spaces.live.com
http://czudek.spaces.live.com
http://chudek.aberon.net
http://www.pclink.com/~k0rc
_______________________________________________
RTTY mailing list
RTTY@contesting.com
http://lists.contesting.com/mailman/listinfo/rtty
|