SCS Pactor, Руководство по установке

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3. Installation
3.4 Ethernet
The connection to the PTC-IInet is established via Ethernet 10Base-T or 100Base-TX. Easily
connect the PTC-IInet to your router, switch or hub with the cable attached.
The PTC-IInet is preconfigured to accept his IP-address assigned by DHCP. If you don’t have
a DHCP server in your network you need to configure the PTC-IInet to use a fixed IP-address.
This is done by removing the DHCP jumper inside the modem. The default IP-address then is
192.168.0.100 and Netmask 255.255.255.0 .
The configuration of the PTC-IInet then continues with the help of a comfortable web-
interface. Here you can change all important settings as well as the IP-address.
The web-interface is mainly self explaining. For every item an online help is available. Just
click on the name of the item you require help for.
You connect the web-interface of your PTC-IInet by entering the IP address as URL into your
prefered web browser, e.g.
http://192.168.0.100 . The user name is “ root ” and the password is
“ PTC2net ”.
3.5 Connections to the transceiver
Due to the variety of possible transceiver types which can be used with the PTC, it is somewhat
more difficult to find out the correct connection. For many common transceivers complete
manufactured cables are available as accessory (chapter 5 on page 52). For all the others the
attached DIN-8 pigtail cable must be used and completed by the user. Your dealer will be
helpful to find the proper connection scheme.
PACTOR-II and PACTOR-III use differential phase-modulation (DPSK), which leads to a
small and effective spectrum. To maintain the advantages on the HF-frequencies, a proper
adjustment of the transceiver’s settings and modulation levels is essential. Over-modulating the
transceiver would lead to unwanted enlargement of the spectrum. Refer to chapter 3.5.4 on
page 41 for how to set the modulation levels properly.
PACTOR-II and PACTOR-III modulation schemes are totally different to and have
nothing to do with simple FSK, which was used in older HF transmission modes. It is
therefore IMPOSSIBLE to use the FSK modulator which can be found in some
transceivers to generate the signal. The PACTOR-II/III signal must always go the
indirect way, which is using the SSB modulator to generate the HF signal. This is of no
disadvantage, providing the transceiver is not overdriven.
Some useful hints to properly setup the transceiver:
•
If possible use a 500 Hz IF-filter for PACTOR-II. Never use a IF-filter with a smaller
bandwidth than 500 Hz! IF filter (SSB-filter) with wider bandwidths won´t cause problems
at all. Although the filtering by the DSP of the PTC is always optimal, it is desirable to
prevent noise from the input of the PTC as far as possible.
•
For PACTOR-III use a 2.4 kHz wide filter (ususlly also used for SSB/voice). Do not use a
smaller one.
•
Under no circumstances use audio processors. The speech-compressor of the transmitter
will damage the PACTOR-II/III signal in the same way as external DSP audio filters will
do. These external DSP audio filters create inpredictable signal propagation delays which
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