Extension on 1,2 MBit full-duplex:

In the autumn 1996 had a direct lightning-impact we into the antenna-installation of our Digipeater and the FM-Relais.

The damage was gross very much.
Our Digi (RMNC) had become actually useless.
Our intent, to reach very high transfer-installments, made us the decision easy
, to base no more RMNC.
We decided for that (X)Net concept with TNC3S of Symek.
We had optimal prerequisites with it for 1,2 MBits.

If you more over (X)Net would like to experience, here is the URL:

(X)Net Home page
About Symek, you learn a whole quantity on this URL:

What has to offer Symek

Recipients:
Since also our previous LNC of the lightning was killed, we had to hold lookout after substitute.
We have covered the rebuilt LNC ready from Hans-Joachim honorary-mountain DF7OH.
The oscillator-frequency amounts to 9,00 GHz and the intoxication-number lies under 0,8 dBs.
To the price from DM 145, - could acquire we with it a Top-Teil to a fair price.
The most difficult was taken care of with it on the recipient-side already once.
The down-mixed Ausgangssignal of the LNB (950 ...1450 MHz) becomes like with
Sat-Anlagen usually with 7mm-Koaxkabel to the Sat-receiver led.
The data-signal is taken the basis-band-exit of the Receivers
(Pin 19 of the Scart-Buchse) and the modem supplied. The level amounts to 1 Vsses there approximately.
As Sat-receiver can almost all types uses becomes.
Types without AFC and with AGC-Ausgang are advantageous.
Spread and video-lifting (if adjustable) is to be put on smallest values,
the basis-band-exit on linear, if possibly (is however also uncritical).


And so it now looks with us:

On Tübinger (DB0AAA) side became the RMNC through a Digi with 4 TNC3S plus Arbiter erstetzt.
We found big support with it from Symek (DK9SJ)
and the operator-group of the Digi DB0SIG (DL1GJI, DL2GWA and DL1GWX).
The Arbiter Steuert the Highspeedbus at him/it the TNC3 is connected.
1 TNC function as master, there, the software runs for the Digi.
(X)Net Entwickelt of Jimy Scherer DL1GJI.
To the master, also the Mailbox is tied up with 115k2 Vollduplexes.
Slave 1 with one 1k2 and a 9k6 modem for the user-access BiMode on 438.350 MHzes.
Slave 2 with one 9k6 and a 19k2 modem.
9k6 for the Benutzerzugeng on 23cm, 19k2 for the Interlink to DB0HP.
Slave 3 with one of DF3GT qualified 9k6 modems.
In order to can do 1,2 Mbits with a 9k6 modem, some alterations are necessary.
Looks in coarse trains of the Tübinger Digi DB0AAA so.
On Reutlinger side becomes the TNC3 (1,2MBit Link to DB0AAA) also with one TNC3S done.
The binding at more networks and to the Reutlinger Mailbox however still happens over a RMNC.


Exhaustive information to 10 GHz you get from:
Jürgen DF5TY@DB0AAA.#BW.DEU.EU
With questions to the 1,2 MBit modem, you turn to Thomas DF3GT@DB0PRT.#BW.DEU.EU

You should have more questions
please Mail at DJ7KA@DB0AAA.#BW.DEU.EU
or e-mail dj7ka@sunwan.mpik-tueb.mpg.de
Many greetings
Uli