Mutual switching between DIGITAL transmission (Status-LED = orange) and ANALOG
transmission (Status-LED = red) issued by 2 times press of the PTT, while in mode 0 2 (PTT A)
While in mode 3 9 (PTT B) you always start a digital transmission with the first press of PTT.
Switching back to analog (if required) is done by pressing PTT twice.
Incoming Digital signals will always be decoded, regardless of the
actually selected mode (eg: if in analog and somebody calling digital).
Adjustment of re ceiver volume:
•O er LED blinking = audio too low
•O er LED always light = audio too high
•O er LED off = correct setting
•Adjusting the digital audio RX level (RX only) has to be done using the volume knob of the
ARD9000, afterwards.
The volume knob of the ARD9000 only changes digital RX volume and does
not have any function during analog reception (by passed in analog)
DIGITAL IN REAL:
•While in Digital Mode, every transmission is initiated by a Sync Header. The Sync Header
has the advantage to compensate 125 Hz to +125 Hz frequency offset. The actual length of
the Sync Header differs from mode to mode (for example Mode 0 = 1.6 sec, Mode 5 = 1 sec)
During the transmission of a Sync Burst, better do not speak, otherwise your QSO partner
could have a problem to recognize the digital header <==> our experience
•AOR states a "silence" is already ensured by buffering (delaying) any speech at the beginning
of the transmission.
•In SSB you will easily recognize the ending of the Sync Header by watching your ALC meter
(maximum peak).
SUMMARY:
•Digital-Voice is surely not a Plug & Play mode. Nevertheless, if you are ready to obey the
given hints, there should be nothing in way of a trouble free entrance to a successful start in
Digital-Voice
•All these experiences were determined in hours of radio to radio connections. Digital-Voice is
simply great and today we would not like to miss this mode....
...wishing you fun and a good start into Digital -Voice e
Mike, DB1JAW and Michael, DK5MH
DB1JAW, Mike Weiler - db1jaw@db1jaw.de
