[1000mp] DSV-2 Control, digital modes, soundcard problem

[Ronald Walters]

Joe,  thank you for the time to respond and you're input will be very
helpful.

First let me clarify some things which I think may help you understand my
problem.

Original comment by W4LDE -
> I now use the packet input for three (MFKS< PSK and RTTY) of the above but
my
> vintage FT1000MP will not allow me PKT operation on USB,
> since MT63 is sideband dependent if I want to operate that
> mode I have to use USB.

[K4IK said --- Your software developer should be flogged for failing to
provide an "invert" capability to allow the use of either
sideband.  Failure to accommodate user radios is terribly
short-sighted and unforgivable]

Joe I do not think that there is any software either freeware, shareware or
commercial that allows for sideband selection when operating MT63, if you do
I would greatly appreciate knowing about it.

[K4IK pass this on "Although the FT-1000MP's Mode selection does not allow
the use of
USB-side injection during "PKT" (Packet) operation, it is possible,
through Menu programming of the parameters of the "User" key, to
configure the FT-1000MP for USB-side injection in the Packet operating
mode for MARS use"]

My FT1000MP is one of the vintage machines and is earlier than lot #5 that
Yaesu references in the "Mars Tech Bulletin", although there fix seems to
work for PKT USB the passband of both receive and transmit is centered
around 2125hz which at the time of manufacturing was the audio of choice.
Can not get it move much lower, MT63 by design uses 1000Hz

All of the digital software from the author and especially the one I use has
the ability to use either LSB or USB , except MT63, one because of the
bandwidth used and the mode is sideband dependent, which is MT63, the
relative new error
correction, low power, low in the noise communication software.   I have had
QSO from all over the world where I could not hear the signal with my ear or
see
it on the water fall display, but still copied 100%.   It (MT63) exceeds my
expectations for speed, beats them all, reliability, beats them all except
for the possibility of MFSK in certain conditions, is easy to tune unless
you can't see it or hear it HI.

My desire was to use the standard packet accessory jack as my primary input
for all software soundcard driven programs, however, MT63 uses 1000hz audio
as its center in the passband.  Problem #1, it is run in USB by the
ham community including the low bands 80-40-30. a problem for my vintage
rig, why?

First I needed to setup the PKT for the lower tones through the menu's which
I think is
centered around 1125, no problem, then I needed to figure out if I could get
the rig to USB.  The MARS tech bulletin allows for USB user mode with a
passband centered around 2125hz and since my vintage rig. as Yaesu states
(Before lot 5) I cannot set the transmit frequency low enough to avoid
clipping of the low tones need by MT63 to operate.

This leaves me two choices, they are

#1) Utilize the "Patch" audio input and run the rig in USB.  I do it now,
but
here are the drawbacks,
    a.  Need to disconnect the microphone leaving a un-terminated open jack
    b..  When I use the internal audio monitor function I do hear some hum,
more than through the low level PKT accessory jack.
        1.  This maybe because one input is a low level audio source
function or some other quirk, I need to follow up on that one
    c..  Requires two different audio cables from my home made Isolation
unit, one to the patch input and the other to the PKT input.

(That's before I learned of the potential of using the DVS jack)

#2)  Utilize the DSV input for all digital modes, seems like a better
approach than two different inputs, mutes the microphone input similar to
the packet input while in that mode deletes duplicate cables and reduces the
chance
of introduction of  RFI or hum pickup.

#1 was the easiest to get up and running, #2 should be my goal and choice.

Now to the hum on the patch, this is something that has been reported by
several hams on different reflectors but maybe it is an anomaly when using
the internal monitor function
and may not be transmitted, I pretty much confirmed that my signal seems to
be hum free at
least that's the report from other hams listening to my signal.

I do utilize isolation transformers on all audio inputs and outputs plus
voltage block caps just to protect and isolate the rig.  I love this
FT1000MP, never had one problem except the 15-meter parasitic problem which
was easy to fix and have used it here since 1996, it is a 1994 manufactured
series. Have install the INRAD IF gain mod, filters, key click mod and its
up to date except for the change required to get it on USB utilizing the
Packet accessory jack.

I cannot think of any other method than either #1 or #2 above to achieve the
need operating condx for MT63
but I am by far not the expert on this one.  Again thank you for you're
input, it got the old brain working and
some times it needs a jump start.  Have a great weekend.

Ron - W4LDE

----- Original Message ----- 
From: "Joe Subich, K4IK" <k4ik at subich.com>
To: "'Ronald Walters'" <rwalters8 at cfl.rr.com>
Sent: Friday, July 23, 2004 18:24
Subject: RE: [1000mp] DSV-2 Control

However, you should still be able to use the PKT input by
making use of the "user" mode and the "MARS" Packet/RTTY
setup.  Here is the link:

http://www.va3cr.net/settings%20and%20troubleshooting/configuring%20for%
20mars%20on%20usb.html

In case the link does not make it, here is the data from Yaesu:

         Configuring the FT-1000MP for USB-side
     Operation in the Packet Mode for MARS Operation

Although the FT-1000MP's Mode selection does not allow the use of
USB-side injection during "PKT" (Packet) operation, it is possible,
through Menu programming of the parameters of the "User" key, to
configure the FT-1000MP for USB-side injection in the Packet operating
mode for MARS use.


Look at the interface by G4AXX:
       http://www.va3cr.net/pdf/SB-MP.pdf

He shows proper interface to the DVS-2 jack from the serial port.

73,

   ... Joe, K4IK