> The microKeyer II does has a second sound card channel
> for use with rigs with two independent receivers; the
> USB Interface III only has one channel. However, unless
> you intend to upgrade to a FT-1000/2000, K3, Orion or
> IC-7800, you will not need that second soundcard.
That list isn't complete ... add the FT-9000 among others. In
addition, any pair of Icom transceivers can be configured to
use one as a second receiver (a perfect use for the second audio
capability).
> Note that the USB Interface III's FSK interface is driven by
> software, microHAM calls it a "pseudo FSK" -- check to make
> sure your software package handles it if you intend to use
> FSK instead of AFSK.
USB Interface III works just fine with EXTFSK in MMTTY or
similar software that provides software generated FSK on
the DTR line.
Pseudo-FSK or p-FSK is unique to fldigi which provides an
on/off keyed 1 KHz tone on the right channel of the sound-
card. That tone is envelope decoded and used to provide
the equivalent of software generated FSK. USB Interface
III is the only commercial interface to provide hardware
support for both fldigi's p-FSK and q-CW modes.
> On the other hand, FSK is properly handled by the microKeyer
> II with pretty much all software (the only exception I think
> is fldigi on the Mac OS X; which should not be a concerned
> for Windows XP).
Fldigi does not support "uart generated" FSK on any platform.
The only way to do FSK (as opposed to AFSK) with fldigi is
using an envelope detector/driver as is done in USB Interface
III (or as documented in the fldigi help files).
73,
... Joe Subich, W4TV
microHAM America
http://www.microHAM-USA.com
http://groups.yahoo.com/group/microHAM
support@microham.com
> -----Original Message-----
> From: rtty-bounces@contesting.com
> [mailto:rtty-bounces@contesting.com] On Behalf Of Kok Chen
> Sent: Sunday, August 16, 2009 1:49 PM
> To: Charlie & Sally
> Cc: RTTY Reflector
> Subject: Re: [RTTY] Advise requested for RTTY Hardware
>
>
>
> On Aug 16, 2009, at 10:00 AM, Andrei Stchislenok wrote:
>
> > For RTTY I don't need MK II-complicated box (for me, I dont have a
> > computer
> > degree) :)
> >
> > 2009/8/16, Jim Reisert AD1C <jjreisert@alum.mit.edu>:
> >>
> >> microHam microKeyer II
>
> IMHO, I agree with Andrei. (Like Andrei, I also have a
> microKeyer II.)
>
> Unless you also need FSK, voice and audio routing
> capabilities, and a
> built in WinKey chip, then the microKeyer II will have much
> more than
> you will need for basic RTTY functionality + CAT for rig control.
>
> For a basic, easy to use RTTY/CAT box with a CI-V interface for your
> Icom rig, something like the microHAM USB Interface III (with
> built-in
> USB sound card) might be a good starter interface. You do
> not have to
> deal with separate USB ports for the sound card and rig control.
>
> The microKeyer II does has a second sound card channel for use with
> rigs with two independent receivers; the USB Interface III only has
> one channel. However, unless you intend to upgrade to a
> FT-1000/2000,
> K3, Orion or IC-7800, you will not need that second soundcard.
>
> Indeed, if you don't intend to use FSK and will be using AFSK for
> RTTY, the simplest interface for someone new to digital modes is the
> SignaLink USB. Like the microHAM's USB Interface III, it also has a
> built in USB sound card. In addition, the SignaLink USB has a audio
> driven PTT ("VOX") which is not present in the USB Interface
> III (but
> is available in the microKeyer II as "Auto PTT").
>
> As long as you are using high duty cycle modes such as RTTY,
> there is
> fewer thing for your software to worry about when you use VOX PTT.
> The PTT circuit in the SignaLink USB asserts the PTT keying line to
> the rig whenever it detects the presence of an audio tone from the
> computer -- the software does not have to do a thing.
>
> Note that the USB Interface III's FSK interface is driven by
> software,
> microHAM calls it a "pseudo FSK" -- check to make sure your software
> package handles it if you intend to use FSK instead of AFSK. On the
> other hand, FSK is properly handled by the microKeyer II with pretty
> much all software (the only exception I think is fldigi on
> the Mac OS
> X; which should not be a concerned for Windows XP).
>
> 73
> Chen, W7AY
>
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