Installation and Operations Manual
UD02YA USB Data Mode Cable
Designed for Yaesu Transceivers
Radioarena Hardware
P.O. Box 7469
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Glasgow
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G42 0YD
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Scotland
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United Kingdom
Telephone: +44 (0)141 4165999
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Home Page: www.radioarena.co.uk
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E-Mail: info@radioarena.co.uk
5
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
input.
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
cable.
•
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
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RV3APM Data Mode Software Collection -
http://www.qsl.net/rv3apm/
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DL9QJ Data Mode Software Collection -
http://www.muenster.de/~welp/sb.htm
•
AC6V Data Mode Software Collection -
http://www.ac6v.com/opmodes.htm
10.0
Disclaimer
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.
