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: [email protected]
4
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, PL-
2303HX 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 Accessory Jack (3.5 mm 4-pole 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
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.
