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Digital Mode Help - Tips
A few Links and Tips for Digital Modes:
http://www.dxzone.com/catalog/Operating_Modes/PSK31/
http://www.ac6v.com/opmodes.htm
http://www.qrparci.org/content/view/4521/118/lang,pl/
http://www.rv3apm.com/
*** Some tips for Digital Mode users:
Power Level - for digital modes, limit your power output to
one half
( ½ ) the radio's maximum rated output. Most sound card
digital modes
use a "100% duty cycle", which means that your radio will be
transmitting at all times, even when characters are not being
sent.
Most radios were not designed for 100% duty cycles,
especially at
full power. So reduce your transmitter power.
HF Radio Settings
Tuning - PSK31 benefits from a radio that can tune in very
small
steps, e.g. 1 Hz. If your radio can't do this, use the RIT
(receiver
incremental tuning) feature of the radio. The automatic
frequency
compensation feature in PSK31 software also helps.
Filters - more on this to come (will update soon)
Speech Compression -- should be OFF.
ALC (Automatic Level Control) - watch the ALC meter to
make sure it
is below the maximum. In general, you don't want to
'overdrive' the
radio with sound card audio levels that would create 'splatter'
(unintended signals) on adjacent frequencies.
AGC (Automatic Gain Control) - does not affect receive audio
when it
is being pulled from a fixed-level audio pin in the radio's ACC
or
DATA jack.
VOX - If you prefer, or if you don't have a spare serial / COM
port
on your PC, you can use the VOX feature of your radio for PTT
control. Activate VOX in your transceiver, and set the level,
delay
and anti-trip controls, as you would when using microphone
(voice)
input. Remember however that if you have your microphone
connected to
the radio, any incidental noise in the room can also be
transmitted
when using VOX.
Microphone - If you are using the ACC jack to control
transmissions,
you may need to disconnect your microphone from the radio
to avoid
sending room noise along with digital signals
http://www.qsl.net/wm2u/psk31.html
*** WM2U's TIP LIST
• Set sound card sampling rate to 11025Hz
• This must be at least a 16 bit sound card.
• No Signal observed? Check your WAVE slider is not zero.
• Set Rx and Tx frequencies to 1000Hz.
NOTE: This value will get you up and running but if you plan
on using
a filter change it to the center frequency.
• If using LSB check the "Inverted QPSK" box.
• Too much noise! Try using a narrow CW filter.
• Using a Word Processor, write your buffered messages and
save
them as .txt files, placing em! in a folder called 'buffers'
created
in the main PSK31 folder.
NOTE: This is NOT a form of type ahead buffer. It is simply a
method
to pre write 'Standard' messages hence saving you
keyboarding time.
*** MORE HELP TIPS
o Your sound card output must NOT overdrive your Mic Input.
o Do not overdrive the sound card input from the Radio.
o Get used to the Waterfall/Phase indicators for tuning.
o Do not use your Speech Processor.
o Be patient. This is a new mode. You will not find all the
features you are used to yet!
**** I would not recommend using the speech compressor for
digital
modes....the mic gain on the rig along with the soundcard
output
adjustments work together to produce wattage out and
correct levels-
varies depending on soundcards/pc etc...so again NO
SPEECH COMP, but
YES you need some mic gain levels
http://www.dxzone.com/catalog/Operating_Modes/PSK31/
http://www.ac6v.com/opmodes.htm
http://www.qrparci.org/content/view/4521/118/lang,pl/
http://www.rv3apm.com/
*** Some tips for Digital Mode users:
Power Level - for digital modes, limit your power output to
one half
( ½ ) the radio's maximum rated output. Most sound card
digital modes
use a "100% duty cycle", which means that your radio will be
transmitting at all times, even when characters are not being
sent.
Most radios were not designed for 100% duty cycles,
especially at
full power. So reduce your transmitter power.
HF Radio Settings
Tuning - PSK31 benefits from a radio that can tune in very
small
steps, e.g. 1 Hz. If your radio can't do this, use the RIT
(receiver
incremental tuning) feature of the radio. The automatic
frequency
compensation feature in PSK31 software also helps.
Filters - more on this to come (will update soon)
Speech Compression -- should be OFF.
ALC (Automatic Level Control) - watch the ALC meter to
make sure it
is below the maximum. In general, you don't want to
'overdrive' the
radio with sound card audio levels that would create 'splatter'
(unintended signals) on adjacent frequencies.
AGC (Automatic Gain Control) - does not affect receive audio
when it
is being pulled from a fixed-level audio pin in the radio's ACC
or
DATA jack.
VOX - If you prefer, or if you don't have a spare serial / COM
port
on your PC, you can use the VOX feature of your radio for PTT
control. Activate VOX in your transceiver, and set the level,
delay
and anti-trip controls, as you would when using microphone
(voice)
input. Remember however that if you have your microphone
connected to
the radio, any incidental noise in the room can also be
transmitted
when using VOX.
Microphone - If you are using the ACC jack to control
transmissions,
you may need to disconnect your microphone from the radio
to avoid
sending room noise along with digital signals
http://www.qsl.net/wm2u/psk31.html
*** WM2U's TIP LIST
• Set sound card sampling rate to 11025Hz
• This must be at least a 16 bit sound card.
• No Signal observed? Check your WAVE slider is not zero.
• Set Rx and Tx frequencies to 1000Hz.
NOTE: This value will get you up and running but if you plan
on using
a filter change it to the center frequency.
• If using LSB check the "Inverted QPSK" box.
• Too much noise! Try using a narrow CW filter.
• Using a Word Processor, write your buffered messages and
save
them as .txt files, placing em! in a folder called 'buffers'
created
in the main PSK31 folder.
NOTE: This is NOT a form of type ahead buffer. It is simply a
method
to pre write 'Standard' messages hence saving you
keyboarding time.
*** MORE HELP TIPS
o Your sound card output must NOT overdrive your Mic Input.
o Do not overdrive the sound card input from the Radio.
o Get used to the Waterfall/Phase indicators for tuning.
o Do not use your Speech Processor.
o Be patient. This is a new mode. You will not find all the
features you are used to yet!
**** I would not recommend using the speech compressor for
digital
modes....the mic gain on the rig along with the soundcard
output
adjustments work together to produce wattage out and
correct levels-
varies depending on soundcards/pc etc...so again NO
SPEECH COMP, but
YES you need some mic gain levels
Always updating and under construction.....need
direct digital mode help... email KB9UMT
direct digital mode help... email KB9UMT
