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DIGITAL SSTV Digital
SSTV / EasyPal
overview and international
band-plan.
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EasyPal
is a software program used for transmitting and receiving digital
slow-scan television (SSTV) images over ham radio. It uses a digital
protocol called DRM (Digital Radio Mondiale), which allows for the
transmission of high-quality images with error correction, making it
more robust against noise and interference compared to traditional
analog SSTV.
Features
of EasyPal:
1.
High-Quality
Images:
Because it uses digital encoding, the images transmitted using
EasyPal can be of much higher quality than those sent via analog
SSTV.
2.
Error
Correction:
EasyPal incorporates error correction methods, which helps to ensure
that the images arrive without distortions, even if there is some
interference during transmission.
3.
Transmission
Modes:
The program has several different modes that can be used, depending
on the conditions of the transmission path, which allows for
adaptability to weak signal scenarios.
4.
Band
Flexibility:
EasyPal can be used on various amateur radio bands, making it
versatile for HF, VHF, and UHF communication.
Digital
SSTV vs. Analog SSTV:
1.
Analog
SSTV:
o
Analog
SSTV transmits images by encoding them into audio tones that are
sent over the air.
o
It's
more susceptible to noise and signal degradation, which often leads
to images with visible noise or loss of detail.
o
Popular
analog SSTV modes include Martin, Scottie, and Robot, which differ
in transmission speed and image resolution.
2.
Digital
SSTV (EasyPal):
o
Digital
SSTV sends images using a digital modulation method, which allows
for a more robust signal, less affected by atmospheric conditions.
o
With
error correction, digital SSTV can reconstruct the image even if
part of the transmission is lost or corrupted.
o
The
quality and error correction make it ideal for HF bands, where noise
and fading are more common.
Digital
SSTV, particularly with EasyPal, offers a significant advancement
over traditional analog SSTV, especially in terms of image quality
and resilience to interference.
Digital
SSTV / EasyPal, can be found on several frequencies across different
amateur radio bands. Here are some common frequencies used for
digital SSTV:
Note: According the the WAI web-site, Digital SSTV
transmissions are usually conducted between 3 - 6 kHz higher on HF
bands and on the same frequencies as Analogue Transmissions.
|
Band |
Frequency |
Notes |
|
40 meters: |
7.173
MHz |
LSB |
|
30 meters: |
10.144
MHz |
USB |
|
20 meters: |
14.233
MHz |
USB,
Can be mixed Anolog and digital SSTV |
The current
and latest public version of EasyPal
is 07-Oct-2014
Down
load: https://www.wasstv.net/wasstv.net/EasyPal-07-OCT-2014-Setup.exe
Popular
Western Australian SSTV net for both digital and anolog SSTV.
Generally
found at 7214.0 kHz LSB every afternoon from 08:00 UTC (4:00pm WST)
For more
details: https://www.wasstv.net/wasstv.net/index-2.html
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Page initiated 10
October, 2024
Page
last revised 20 May, 2024
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