Ceragon 1528 7 GHz hope at 3 miles

[GeGalina]

We have the following scenario using (trying to use ) a Ceragon Hope at just 3 miles:

- two FibeAir 1528 IDUs
- two FibeAir 1528 ODUs model 15-O-E-7 at 7.1-7.9 GHz
- two RFS single polarized antennas 2 ft 7.1-8.5 GHz
- two 1 meter waveguides
- 1 diplexer 7470 MHz at low band center and 7624 MHz at high band center
- 1 diplexer 7582 MHz at low band center and 7827 MHz at high band center

We are pursuing to set up a link but we could not so far. In fact, we don't know what to do anymore. Because of this we need some help. We have tried al the frequencies combinations that our country permits but we almost always have a -99 Monitored RX level.

The following leds are RED:
- Line
- LOF
- BER
- RMT

and ODU (RFU) is yellow (probably because our incorret Tx/Rx parameters).

1) Are the diplexers incompatible because of their frequencies?

2) Do we need a dual polarized antenna to use with these radios?

3) We mount one end in tx high (diplexer towards up) and the other one in tx low (diplexer towards down). Are we right?

4) We are setting the RX frequency of one end EQUAL to TX frequency of other end and vice versa. Are we right?

5) Do we need to set up a TX channel? Sometimes it comes red on its field.

We will appreciate any further information besides our doubts.

Thank you very much.

[Cost_Reducer]

Hi GeGalina,

We have the following scenario using (trying to use ) a Ceragon Hope at just 3 miles:

- two FibeAir 1528 IDUs
- two FibeAir 1528 ODUs model 15-O-E-7 at 7.1-7.9 GHz
- two RFS single polarized antennas 2 ft 7.1-8.5 GHz
- two 1 meter waveguides
- 1 diplexer 7470 MHz at low band center and 7624 MHz at high band center
- 1 diplexer 7582 MHz at low band center and 7827 MHz at high band center

We are pursuing to set up a link but we could not so far. In fact, we don't know what to do anymore. Because of this we need some help. We have tried al the frequencies combinations that our country permits but we almost always have a -99 Monitored RX level.

regarding to your issue which you raised please note that, if you use the 1st Diplexer combination, you must set up in the RFU a 28Mhz channel.
The transmitt frequency of one end of the link must be the receive frequency at the other end of the link and vice versa. To use single polarity antennas is ok but you must use the same polarisation at both antennas (vertical or horizontal). For a 3miles hop please use the lowest output level you can to avoid a RX overload.

The following leds are RED:
- Line

Line = indicates a Loss of Signal at your line interfaces (proprobably no equipment connected, you can ignore this)

- LOF
- BER
- RMT

LoF indicates a Loss of Signal in the HF Receiver (RX, no detection of any data stream)
BER indicates high bit error rate at the air interface
RMT indicates a communication problem with the remote sid

and ODU (RFU) is yellow (probably because our incorret Tx/Rx parameters).

where you can see a yellow RFU symbol ?

1) Are the diplexers incompatible because of their frequencies?

use your 1st oppertunity and set the RFU script to 28 Mhz channels and use following frequencies: High Band = 7624.00 & Low Band = 7470.00 Mhz

2) Do we need a dual polarized antenna to use with these radios?

No! 1 pol antennas are enough but make sure you use the the same polarzation at both ends that means both waveguides horizontal or vertical connected to the antenna

3) We mount one end in tx high (diplexer towards up) and the other one in tx low (diplexer towards down). Are we right?

How dou you mean this

4) We are setting the RX frequency of one end EQUAL to TX frequency of other end and vice versa. Are we right?

use my suggested frequencies

5) Do we need to set up a TX channel? Sometimes it comes red on its field.

Yes RFU's works according to ITU or FCC standarts

I hope this will help you


BR

Cost_Reducer

[GeGalina]

Hello Cost_Reducer.

Thank you for your reply.

Hi GeGalina,



regarding to your issue which you raised please note that, if you use the 1st Diplexer combination, you must set up in the RFU a 28Mhz channel.
The transmitt frequency of one end of the link must be the receive frequency at the other end of the link and vice versa. To use single polarity antennas is ok but you must use the same polarisation at both antennas (vertical or horizontal). For a 3miles hop please use the lowest output level you can to avoid a RX overload.


Line = indicates a Loss of Signal at your line interfaces (proprobably no equipment connected, you can ignore this)


LoF indicates a Loss of Signal in the HF Receiver (RX, no detection of any data stream)
BER indicates high bit error rate at the air interface
RMT indicates a communication problem with the remote sid


where you can see a yellow RFU symbol ?

In the IDU's panel and in the Ceraview Element Manager software. They both show a yellow LED. According to the hint, showed in the software screen, it's because ODU is in high temperature OR TX and RX frequencies are not known by the system.

use your 1st oppertunity and set the RFU script to 28 Mhz channels and use following frequencies: High Band = 7624.00 & Low Band = 7470.00 Mhz

What exactly do you mean? High Band = TX in one end = RX in the other one? I am still confused about High Band and Low Band. Sorry if I am a dummy but sincerely I am still confused about these concepts.

No! 1 pol antennas are enough but make sure you use the the same polarzation at both ends that means both waveguides horizontal or vertical connected to the antenna

Are the waveguides polarized? The antennas we are sure: they are both in Vertical.

How dou you mean this

I meant the following: One diplexer points to the sky and the other one points to the floor.

use my suggested frequencies

Yes RFU's works according to ITU or FCC standarts

I hope this will help you

Me too. Because we don't know what to do anymore!

BR

Cost_Reducer

[Cost_Reducer]

i hope it will help you to fix the problem. if not please come back!

[GeGalina]

i hope it will help you to fix the problem. if not please come back!

Hi again.

Sorry for the inconvenience but could you help me with the new questions in my last post?

P.S.: BR = Brazil? Are you from Brazil?

Thank you.

[Cepillo]

Hi again.

Sorry for the inconvenience but could you help me with the new questions in my last post?

P.S.: BR = Brazil? Are you from Brazil?

Thank you.

Hi

I think this is a culture of writing letters

BR = Best Regards

[Cost_Reducer]

you are so right english style

Hi

I think this is a culture of writing letters

BR = Best Regards

[Cost_Reducer]

Hi GeGalina,

1) do you have the opportunity to get some "Configuration Reports" from the IDU? Connect your PC to the IDU and LogIn into the unit and go to FILE and try to download the configuration file. Next, send me some PART-Numbers of your equipment, you can find they on the stickers on the units.
2) the modulation scheme in the IDU is fixed at the 1528 system. Do you use a 16 or 128 QAM IDU?
3) give me the total frequency range and the mid frequency of the diplexer you want to use, you can find it on a sticker on the diplexer (hopefully)
4) waveguides are not polarized, be sure that you install the waveguide in the same direction like the interface at the antenna
5) do you have some pictures of your installation & system

BR (Best Regards) Cost_Reducer

Anyway...I'm not from Brazil...Europe

[GeGalina]

Hi CR.

Hi GeGalina,

1) do you have the opportunity to get some "Configuration Reports" from the IDU? Connect your PC to the IDU and LogIn into the unit and go to FILE and try to download the configuration file. Next, send me some PART-Numbers of your equipment, you can find they on the stickers on the units.

Please, take a look at the pictures:
Picasa Web Albums - Gean Galina - Links_microondas

We have two IDENTICAL pairs of:
- IDUs 1528
- ODUs 15-O-E-7 (by the way, what's the difference between 15-O-E-7 and 15-OX-E-7?)
- RFS 2 ft. antennas
- flexible waveguide

BUT two different diplexers (is it our problem?)

2) the modulation scheme in the IDU is fixed at the 1528 system. Do you use a 16 or 128 QAM IDU?

We don't know. How could we see this? Via software?

3) give me the total frequency range and the mid frequency of the diplexer you want to use, you can find it on a sticker on the diplexer (hopefully)

Diplexer #1 at TX High ODU:
- Low band center: 7582 MHz
- High band center: 7827 MHz
Diplexer #2 at TX Low ODU:
- Low band center: 7470 MHz
- High band center: 7624 MHz

4) waveguides are not polarized, be sure that you install the waveguide in the same direction like the interface at the antenna

How so? Is there a way to install the waveguides incorrectly?

5) do you have some pictures of your installation & system

Look at the link above.

BR (Best Regards) Cost_Reducer

Anyway...I'm not from Brazil...Europe

Thank you very much.

[Cost_Reducer]

Hi GeGalina,

thanks for your pics, now the picture of your problem is much clearer than befor.

Your biggest problem is that you use 2 different channels in your diplexer.
Look at pics 12 & 26. At the site in pic 12 you use the diplexer with Low Band Center frequency = 7582.0 Mhz & High Band Center frequency = 7827.0 Mhz. And at the remote site,pic 26, you use diplexer with Low Band frequency = 7470.0 Mhz and High Band frequency = 7624.0 Mhz. That are 2 different channels in the 7.5 Ghz band.

Try to get a diplexer frequency pair and use this and then it will work.
The waveguides are proper installed at the antenna, both use the V plane.

Good luck !

BTW....in which town is the link located?


BR

Cost_Reducer