This mini-project aim is to receive satellite signals from two different places (RF station 1 and RF station 2)and send them into the main broadcasting center
Equipment used?-?For RF stations 1 and 2
- 4 x ETL String Ray Fiber series DWDM,?1U chassis ( MUX)
- 6 x ETL SRY-C201(with T 257 Modules)
- BNC termination panels
- Fiber patch panels
- Fiber patch codes?
- RG6 cables BNC connectors etc.
The following test equipment?was also used
- Signal source to generate 1500MHz, -15dBm - I used Paradise Modem PD25, Make sure all the time you need to switch off DC, if not it will be damage to spectrum ??
- Spectrum Analyser.?
- Laser light source to locate faults.
- Both RF stations receiving signals using a number of?C band, Ku band, ka band satellite antennas.
- These signals follow up normal procedure and come to 128x128 Vulcan matrix.
- All outputs from the Matrix system (75 ohms BNC) send it to three SRY-C201 ( T257) chassis.
- Each SRY-C201 chassis has 16 T257 Coax to fiber converter modules, all together I've used 48 modules per one RF station.?
- Visual inscription and conformation are of utmost importance in this installation.
I put my full attention on the following points ??
- Verify SRY Tx modules in StingRay TX modules (T257) in the StingRay chassis have been installed in the correct positions.
? ex: check the module numbers?
- First chassis modules starting from C21 and end with C36.
- The second chassis modules start from C37 to C44 and again it will start from C21 and end with C28. ( This is quite a special scenario because according to our requirements manufacturer arrange it)
- The third chassis starting from C29 to ending with C44.
- Next, confirm that each fiber output from T257 modules goes to the correct port of the MUX.
? ex: MUX port numbers start from T20 to T59
- C21-T21 (C21 SRY module number and T21 MUX port number)
- C22-T22
- .............
- C44-T44, etc.
- Because I've used two MUXs for considering future expansion so I need to keep some spars. ?
- It is essential to use the above steps if not fiber signals will not reach to Main Broadcasting center.
- The reason behind this is each Modules has a separate wavelength and this wavelength must be matched with the MUX ports ( MUX port also designed accordingly)
- Fiber output signal from SRY-C201 connect to MUX, using SC APC / SC APC?notes that careful about connectivity, It's better to use support pieces of equipment.
- ?I did it carefully if something goes wrong I won't be able to get signals, or maybe signal strength will go down.
- MUX Outputs send to the broadcasting center via?2 x fiber links.?(Distance between RF stations and broadcasting center is nearly 400-500m)
- note that each RF station transmits signals using 2 long fiber links to the broadcasting center, and the broadcasting center receiving 4 x fiber signals.?
- In Broadcasting station received 4 x fiber signals?I gave to 4 x DMUX as input and?accordingly, I got outputs accordingly.
- The next step is to convert fiber outputs to coax.
- Therefore I've used 6 x SRY- ODX-C201chassis and each one having 16 x Rx 241 modules altogether with 96 coaxial outputs.
- The next step is to connect these outputs to 4U 26186?splitter chassis.
- Each 4U splitter chassis has 8 splitter cards and each card consists of 8 outputs. ??
- So one chassis has 64 RF outputs and I've used 12 x 4U chassis = 64 x 12 ( 768).????
- ?These RF outputs I connected to DCM D9902 (DCM - Digital content manager) as inputs.
This is how I designed and completed this mini-project and still a lot more to do.
If I have time I'm planning to write a small article with the next steps.
And I am happy to share some of the pictures I've taken during the work.
