Jim, et. al., Thanks for the advice. However, after installing the
USA-49WG and driver install for Windows 7 with help from Tripp Lite
technical support, my system still does the same thing. I plug the
serial cables to both rotor and transceiver digital interfaces and then
to the 49WG and the same thing happens. Azimuth meter drops to zero and
there is no control. Further it is now working worse than before, as I
have neither control of rotor or transceiver. If measure the voltage
between metal shields of the two cables, there is about 2 volts there.
It sure looks like a ground loop, but where and how. I have no idea at
this point. In 56 years a ham operator, I've never run into anything
like this. Maybe RS232 isolators would fix this??? Seems like overkill.
On 4/10/2010 6:01 PM, kq6ea(a)verizon.net wrote:
I bought one of the Keyspan 4-port boxes some years
ago, and it's
never missed a beat.
I mostly use it on Field Day with my laptop so I can have SatPC32
control my Ft-847, btu now that I've built both the Las Vegas Tracker
*and* the Fox Delta unit, I'll be using it to control the radio and my
Uaesu Az/El rotor.
They've not inexpensive, but then you always get what you pay for!
73, Jim KQ6EA
On Apr 10, 2010, *Larry Gerhardstein* <gerhardstein(a)montana.com> wrote:
I hope someone can shed light. I'm using SatPC32, but that does not
affect this problem.
Awhile back I was forced to recycle both of my older computers
one built in 9-pin serial port. Then, I connected the built-in
the GS-232B rotor interface. I also purchased some HL USB-RS232
USB-to-Serial adapters, a cable with USB on one end and a 9 pin
the other end. I used this gadget to control my transceiver (which
Now I have a new computer which has no (zero) built in serial ports.
I'm trying to use two of the USB-to-Serial gadgets and have run into
trouble. If I disconnect all grounding back through the power, I can
get one of the two to work, either the rotor or the rig-control,
both at the same time. Without disconnecting grounding, neither work.
It does not matter whether I'm plugging the USB ends directly into
computer, using a passive USB hub, or a powered hub--same result.
All I have to do to get this to fail...is... Even if the USB ends are
not plugged into the computer and the rig control box is powered
unplugged from power, if I just touch the metal shield on the USB
going to the rig control onto the shield connection in the
hub, that causes the rotor control to fail. When it fails, The
reading on the G-5500 drops all the way to zero. The elevation
It acts like a ground loop somewhere, but where and how? I've tried
disconnecting the coaxes from the transceiver but no change.
I'm thinking about scrapping these USB-to-Serial things and going
4-Port Keyspan box.
73, Larry W7IN - DN27 in Plains, Montana
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