SCS PTC-IIex, Manual

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12 SYStest
Chapter 12
12 SYStest
The system test is not normally required by the PTC user, but has been included here
for the sake of completeness.
SYStest
is purely a tool to diagnose and rectify faults in
defective PTC's. In normal operation this function is not needed.
The command
SYStest
(without argument) activates the systemtest menu. ( sys:-
menu). The command prompt takes the form sys: .
Within the sys:- menu, the following systemtest commands are allowed:
Audio
,
AUDPerm
,
Beep
,
DD
,
Down
,
Fsk
,
Help
,
Kill
,
Led, MONitor, Ptt
,
PLl
,
Ram
,
Up
,
Quit
.
All other ( normal) commands are not available! The sys:- menu may be ended with
Quit
or
DD
.
The
SYStest
command may also be followed by an argument, which should be a
command from the
sys:-
menu. In this case, the PTC carries out only that given
systemtest command, without switching to the sys:- menu. The command may be said to
have been fed through.
This command for example would show the PTC-IIex RAM expansion.
cmd:
SYS
Ram <Return>
The
sys:-
menu commands in detail:
12.1 Audio
Serves to carry out a so-called Audio loop test or check of the analogue I/O stages, as well
as the DSP. This function requires a wire connecting PIN 1 (Audio Out) and PIN 4
(Audio In) of the 8 PIN shortwave radio socket (X4)!
If the analogue stages are working correctly, the PTC-IIex gives out
OK
. In cases where
an error occurs, then
NOT OK
is displayed.
12.2 AUDPerm
Default setting: 0
Parameter: 0 Audio output, only active in the TX operation or the aud:- menu.
1 Audio output permanently activated.
This
AUDPerm
command allows the audio input / received signal to be permanently
passed through to the audio output pin, as long as the PTC is in the receive condition.
This has the great advantage if one has the PTC-IIex in use as an AF filter/denoiser:
NOTE: With some older or simpler radios, it is possible for feedback to occur when the
received signal also appears at the transmitter microphone input. In these unusual cases,
the PTC-IIex must be used with
AUDPerm
set to 0. Alternatively, the transmit AF
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