UD04TT - Radioarena

UD04TT - Radioarena
Installation and Operations Manual
UD04TT USB Data Mode Cable
Designed for Ten-Tec Transceivers
Installation and Operations Manual
USB Data Mode Cable
This is an excellent piece of equipment that will give you outstanding performance.
This data mode cable is compatible with the following Ten-Tec HF trasnsceivers:
6N2 Model 526
Corsair Model 560
Corsair II Model 561
Omni-A Model 545
Omni-A Model 545B
Omni-C Model 546C
Omni-D Model 546
Omni-D Model 546B
Omni-V Model 562
Omni-VI Model 563
Omni-VI Plus Model 564
Paragon Model 585
Paragon II Model 586
Please note that this data mode cable should not be used with other transceivers not mentioned in the list above. Otherwise you may
damage your transceiver or computer.
Radioarena Hardware
P.O. Box 7469 ● Glasgow ● G42 0YD ● Scotland ● United Kingdom
Telephone: +44 (0)141 4165999 ● Home Page: www.radioarena.co.uk ● E-Mail: info@radioarena.co.uk
Installation and Operations Manual
UD04TT USB Data Mode Cable
Designed for Ten-Tec Transceivers
1.0 Introduction
Communication technologies that are specifically designed to improve «live» HF keyboard operation can now be achieved that were previously
only theory or too complex to be practical. Thanks to the generosity of radio hams with programming knowledge, and to the World Wide Web,
new and powerful communications tools are available to all hams. The evolution and wide spread use of the Personal Computer with a digital
sound card for DSP, is allowing us to use these tools to «push the envelope». The distinguishing features of live HF digital operation today are
the use of lower power, compact or indoor antennas and courteous operating technique. This reverses the trend of several years ago...
Data modes are at the cutting edge of radio communications, making maximum use of the limited and precious band space. And with modes like
PACTOR and PSK31, you will be amazed how it is possible to pull signals out of the noise and decode them 100% when normal voice
communications is impossible. This cable enables you to connect your transceiver directly to your PC and operate a selection of data modes. No
external power supply is required. Components are of the highest quality and the unit underwent the stringent quality control and inspection
We recommend that the minimum requirement is a PC with 500 MHz processor or better, 512 MB of RAM, 1 GB hard drive, USB port, and
Soundblaster or compatible soundcard. Simply download and install Prolific drivers, the software for the mode(s) that you want to try, plug in the
supplied cable, and you are set. Presently available ham radio sound card software, this digital mode cable, a radio and a computer is the easy
and modern way to operate: BPSK, QPSK, FSK, MFSK, MT63, Throb, Hellschriber, SSTV, FAX, WeFAX, RTTY, AMTOR, ASCII, PACTOR, G-TOR,
PACKET, APRS, CW, SSB Contest Voice Keying, WSJT, NAVTEX, Q15X25, Olivia, Domino, Chip, Echo-Link, and many others.
2.0 Precautions
Make sure that your computer and you ham station have a common AC ground that is bonded at a single point. This means that
all station grounds and AC grounds must be at a single low impedance point. Any AC leakage or voltage between multiple
grounds could damage your radio or computer when connecting the system together. This is true of all station interconnections
and accessory installations.
Having the AC service ground on one side of your house and another ground for your antenna on the other side of your house
creates dangerous ground loop if not bonded together at a single point. This huge ground loop (loop antenna) could pick up the
electromagnetic pulse of a near-by lightning strike and induce a huge electrical spike directly through your equipment. If your equipment is
effectively connecting two ground systems together instead of being connected to a single point ground you are asking for trouble.
Disconnecting your antennas for thunder storms will not protect you if you have a station ground that is at a different location from your AC
house ground.
Be careful not to bump or stress the cable sticking out of your USB port or soundcard audio sockets as this could physically damage your
computer’s connectors, or the cable. Do not allow the cable to get wet or to use it in humid locations.
3.0 Features
You will find that when you purchase our data mode cable you will possibly never need to replace it. This cable is extensively tested at time of
manufacture to be free of defects. Its features are listed below:
Compatible with every soundcard equipped computer.
Works with every present or future HAM radio soundcard program.
Properly matched audio to your radio.
Advanced circuit design and cable shielding for RFI product suppression.
Bidirectional transformer isolation of input and output audio signals.
Optical isolation of PTT signal through the optocoupler.
Positive and fully automatic PTT control supported by almost all HAM programs.
High quality and professionally designed fiberglass printed circuit board.
High quality factory molded connectors.
High quality and stylish inline screwed flat box for PCB.
No external power supply needed, great for portable or QRP installations.
Robust and light cable, excellent for both - portable and shack use.
4.0 Main Unit Circuit Diagram
Input and output audio signals from the radio to the computer and vise versa are
supplied through 1:1 bidirectional audio transformers for proper isolation of the
Positive and fully automatic PTT control is supplied from the computer to the radio
from USB port through the circuit based on the Prolific PL-2303HX USB to Serial
Bridge Controller and the optocoupler for proper optical isolation between your
computer and the radio.
PTT control uses RTS line in the virtual COM port created after driver installation.
PTT line provides +5 VDC by virtue of a corresponding voltage stabilizer
implemented into the USB to Serial Bridge Controller circuit.
Radioarena Hardware
P.O. Box 7469 ● Glasgow ● G42 0YD ● Scotland ● United Kingdom
Telephone: +44 (0)141 4165999 ● Home Page: www.radioarena.co.uk ● E-Mail: info@radioarena.co.uk
Installation and Operations Manual
UD04TT USB Data Mode Cable
Designed for Ten-Tec Transceivers
5.0 USB to Serial Bridge Controller Circuit Diagram
PL-2303HX provides a convenient solution for connecting the PTT line to the Universal Serial Bus (USB) port. PL-2303HX highly compatible
drivers could simulate the traditional COM port on most operating systems allowing the existing data mode programs based on COM port to
easily migrate and be made USB ready. By taking advantage of USB bulk transfer mode, large data buffers, and automatic flow control, PL2303HX is capable of achieving higher throughput compared to traditional UART (Universal Asynchronous Receiver Transmitter) ports.
6.0 Connection Diagram
Computer End
1 – Sound Card Microphone Input (3.5 mm Stereo Jack)
2 – USB Port
3 – Sound Card Speaker Output (3.5 mm Stereo Jack)
Transceiver End
4 – Audio Out Rear Panel Connector (RCA Phono Jack)
5 – PTT Rear Panel Connector (RCA Phono Jack)
6 – Audio In Rear Panel Connector (RCA Phono Jack)
It is not recommended to use long data mode cables, therefore this cable is 100 centimetres long only. Do not place this cable within 30
centimetres of power transformers, video monitors, or anything that emits strong varying magnetic fields. If you locate this cable near a monitor,
the sweep circuits can introduce hum and noise into your signal. If there is a power line operated transformer within several centimetres and if it
has flux leakage, 60-cycle hum can be introduced into your stations audio systems. Be sure your station ground is good, all the equipment is
grounded together properly with a wide smooth conductor, and you have followed all station wiring suggestions found in reliable sources such as
the ARRL Handbook. Check the sound card volume control settings, and the gain settings of the radio. Be sure they are close to normal
operating settings, and not set too high.
7.0 Audio Signal Adjustment
One of the most common problems using digital modes is improper system level. Even at best, digital modes have limited dynamic range
compared to modes that closely «fit» filter bandwidths in the transmitter and receiver. When the radio filter is wider than the mode being used,
the system depends heavily on having absolutely no distortion at any place in the system. Adjustments and levels throughout the entire system
affect bandwidth and quality of transmitted and received signals.
When transmitting, it is extremely important to use correct gain levels. If the input of a transceiver is overdriven, the signal will contain
unwanted products. Problems might not show on spectrum or IMD displays and if they do, many people do not recognize them. Excessive level
into the radio can aggravate harmonic distortion (this often does not register on IMD or displays), causing transmissions on multiple frequencies.
For example a PSK transmitter using 1,000 Hz offset will have some signal level at 2,000 Hz and every other multiple of 1,000 Hz. These
harmonics might make it back through a narrow filter, and while they cause others interference they will not show on a spectrum display! The
Radioarena Hardware
P.O. Box 7469 ● Glasgow ● G42 0YD ● Scotland ● United Kingdom
Telephone: +44 (0)141 4165999 ● Home Page: www.radioarena.co.uk ● E-Mail: info@radioarena.co.uk
Installation and Operations Manual
UD04TT USB Data Mode Cable
Designed for Ten-Tec Transceivers
same is true for poor carrier suppression. Since the carrier can be outside the pass band of a receiver, it will not always show on displays of
people you are working.
Use a normal receiver volume setting, and adjust the sound card microphone level (make sure any extra gain options are off) to approximately
half scale. Regardless of what you do, it is always a good idea to have someone listen to your signal when the band is empty, signals are strong,
or noise is very low. They should look carefully for spurious signals, noise, and hum. When transmitting on modes like MFSK and PSK, always try
to use a frequency setting of more than 1500 Hz and less than 2500 Hz. This will allow the transmitter’s SSB filter to suppress unwanted
harmonics from the audio system driving the transmitter. Remember it is sometimes necessary to select the narrowest filter possible in the
receiver, rather than depending on the computer to filter out strong unwanted stations. If you depend only on the sound card, you will find that
even very clean strong signals overload your system. The problem is often in your receiver system, not in the offending transmitter. Many
transceivers allow a selection of narrow filters while operating SSB, or include pass band tuning controls. If you have trouble with a strong
station nearby causing interference, try to use more selectivity or use the receiver’s notch filter to reduce the signal level.
You must have a 16 bit sound card installed in your computer to use digital mode programs. Read the documentation with the sound card for full
instructions on the use of this card in general. Find the mixer control panel, which may be a program that was supplied with the soundcard or it
may be part of the Windows Control Panel. Learn how to adjust the soundcard playback output level and the record input level using the mixer
panel: these controls will be used to set the levels for Digital Modes. The modem is feeding audio direct from the soundcard output to the AF
Do not use a speech processor with Digital Modes. When you have reached the correct setting, you will see that changing from the tuning tone
to typing text, will make the transmitter power swing from 50% (no typing) to 100% (typing or tuning-tone). This change in power is correct.
It's quite OK to let the transmitter ALC line operate on Digital Modes. The ALC line will control the drive level without clipping in the same way
that it does on voice operation.
To check that the receiver output is not overdriving the soundcard, tune to a strong steady carrier to give 1,000 Hz audio tone, with the RF gain
of the receiver at maximum so that the receiver AGC line is fully operating. Check that the waterfall shows a single vertical white line with no
red. Reduce the soundcard input gain in the mixer control panel if you see red lines on strong signals (DigiPan example).
To complete the soundcard setup for use with Digital Modes, the soundcard sample rate needs to be set. A key defining characteristic of any
digital audio signal is its sampling rate, usually just called the sample rate. This refers to how frequently the analogue signal is measured during
the sampling process. If you think about it, the reason why this is important is obvious: imagine that you had a recording of someone speaking,
and you sampled the recording once per second. You'd end up with a lot of choppy noise. The more frequently the signal is sampled, the better
the approximation to the original sound. However, the higher the sample rate the more memory is required to store the samples, so you don't
want to sample more than is necessary either!
8.0 Required Drivers
As mentioned above the PTT line of this cable communicates directly with a computer through the USB port. A physical Serial Port connection is
not needed since the Prolific drivers emulate a virtual Serial (COM) Port which communicates with a radio at the required TTL voltage levels. The
drivers for various operating systems are available at the Prolific website [www.prolific.com.tw] or could be supplied on a CD along with the
Complete set of drivers is available at http://www.prolific.com.tw/eng/downloads.asp?ID=31
Full driver installation instructions are available at http://www.prolific.com.tw/eng/downloads.asp?ID=33
9.0 Data Mode Programs
We do not write data mode programmes. We also cannot properly support software, only the author of that software can. There is a lot of data
mode programmes can be found on the Internet! Most of these are «freeware» or «shareware» and in many cases provide a level of
performance beyond your wildest dreams!
As a reference guide we would suggest you a few links listed below:
EPC Data Mode Software Collection - http://eu.srars.org/index.php?option=com_weblinks&catid=2&Itemid=79
RV3APM Data Mode Software Collection - http://www.qsl.net/rv3apm/
DL9QJ Data Mode Software Collection - http://www.muenster.de/~welp/sb.htm
AC6V Data Mode Software Collection - http://www.ac6v.com/opmodes.htm
The cable should not be used in any situation where its failure could cause human injury or severe damage to equipment. This device is not
designed for or intended to be used in any life critical application.
This product and its documentation are provided as-is and no warranty is made or implied as to their suitability for any other purposes apart
from those described above. This document provides information on our product and all efforts are made to ensure the accuracy of the
information contained within. The specifications of the product are subject to change and continual improvement.
Radioarena Hardware
P.O. Box 7469 ● Glasgow ● G42 0YD ● Scotland ● United Kingdom
Telephone: +44 (0)141 4165999 ● Home Page: www.radioarena.co.uk ● E-Mail: info@radioarena.co.uk
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