Tetra-Mobile-Stations Detector
******************************
Restrictions of the demoversion
*******************************
- The demoversion is only available for the ICOM R10.
- The demoversion will run 4 hours until you need to
restart the TMS-Detector program. You have to quit
and to restart the program, if you want to continue.
- The demoversion will only log 20 messages. You have
to quit and to restart the program, if you want to
continue.
- Do not expect software updates for the demoversion.
- The demoversion do not need and can not use the TMS
timing circuit. You can use the original ICOM R10
C-IV cable or any compatible cable to direct control
the R10 by the TMS-Detector program. The timeslot
sampling of the Tetra channels direct by the PC is
not as accurate as with the TMS timing circuit.
Therefore there is a higher probabillity to oversee
Tetra signals.
Schematic for a very simple ICOM-PC C-IV cable
**********************************************
PC RS-232
Gnd-----E
[BC547C] B---4.7kOhm------TX (Pin3, Sub-D-9)
C
| [1N4148]
| x--|<---RTS (Pin7, Sub-D-9)
| |
| 4.7kOhm
3.5mm mono plug | |
to the ICOM R10 | x--------RX (Pin2, Sub-D-9)
| |
C-IV bus (tip) | C
-------------------x--10---B [BC547C]
kOhm E
|
--------------------------------------x-------Gnd (Pin5, Sub-D-9)
Gnd
BC 547C
--------- view on
\ C B E / the leads
-----
Note: This circuit is very simple and does not provide a negative
voltage on the RX line. If you get problems with this circuit,
you probably have to build a level interface with a Maxim 232.
Maxim232 level interface (the correct C-IV interface solution)
**************************************************************
[1N4148] [7805]
RTS (Pin7, Sub-D-9)--->|--x----x----Vin Vout-x +5V
| |(+) GND |
DTR (Pin4, Sub-D-9)--->|--x 470uF | |
[1N4148] | | | (+)
Gnd Gnd x---47uF--Gnd
|
GND (Pin5, Sub-D-9)------Gnd |
|
|
[Max232] |
x------1 /--16------x +5V
|(+) (+) |
10uF 2----10uF--^ 15------x-----Gnd
| |
x------3 14 |
|
x------4 13 |
|(+) |
x-10uF-5 12 | Gnd 3.5mm mono plug
(+) x--------- to the ICOM R10
Gnd----10uF------6 11
C-IV bus (tip)
RX (Pin2, Sub-D-9)-------7 10--------x-------
|
TX (Pin3, Sub-D-9)-------8 9---|<---x
BAT43
What to do against to much computer noise?
******************************************
- Try to use an external antenna far away from any computers.
Even five or ten meters away the noise level will be lower.
- Try to shorten some interferences with a 10pF condensator
between Gnd and the C-IV line.
- Do you get fewer interferences, if you disconnect the R10
from the AC/DC adaptor? Try the following EMI filter:
DC Plug -x--1uH--x--1uH--x-- to DC/AC
| | | adaptor
R10 10pF 100pF 1nF
| | |
Gnd ----x--1uH--x--1uH--x-- Gnd