Re: [Discuss-gnuradio] Amplifier

[Cristian Rougier]

Hello, Wayne, thank you very much for your answer.

This is the amplifier and duplexer specs: (i paste this in order to dont attach the doc).

AMPLIFIER

Shenzhen Ledmate Technology Co., Ltd.
PCS Signal Booster
Technical Features:
*Receiving and sending separation,low require for Ant isolation,making it
convenient for installation.
*Mini design with metal cavity filter technology inside.
*Full-duplex&dual-port design,and built-in power supply,making it convenient for
installation.
*Allowing for continuous gain adjustment 31dB by 1dB step.
*ALC technology used to provide auto amplitude fixing.
*Modules structures,making it convenient for installation,debugging and
maintenance.
LM-P1900-25-A
Item
Frequency Range (Mhz): Downlink :1930-1990MHz Uplink:1850-1910MHz
Downlink :≥65dB
Gain (dB) Uplink :≥70dB
Output Power (dBm) ≥25 dBm
ALC ≥28 dB
Outer-band Spurious <-36dBm ≤-36dBm(9KHz—1GHz)
Spurious emission ≤-30dBm(1GHz—12.5GHz)
Isolation >135dB
Tri-rank intermodulation ≤-40dBc(PO=25dBm/CH/2CH)
band flatness PCS1900≤±5
Relay Phone PCS
Cover area 1000sq.m
(Without concealment)
Install Methods Lay/ Hanging(Indoor)
Power supply AC220V(Expert AC-DC Convertor)(Facility Power Supply:DC+5V)
Size 200mm(W)×142mm(D)×40mm(H)
Weight Approx. 1.2 kg
Fittings DC+5V/3Apower adapter ; Instruction
High-reliability Comply with GB6993-86 standard

 

 

DUPLEXER

1850～1910MHz/1930～1990MHz duplexer

 

Technical specification

 

Serial	Parameters	RX	TX
1	Frequency Range	1850～1910MHz	1930～1990MHz
2	Insertion Loss	≤1.0dB	≤1.0dB
3	Ripple	≤0.7dB	≤0.7dB
4	VSWR	≤1.3	≤1.3
5	Rejection	≥65dB@1930～1990MHz	≥65dB@1850～1910MHz
6	Input Power	50W CW
7	Operating Temperature	-40℃～+70℃
8	Surface Finish	Black Paint
9	Connectors	N-Female
10	RoHS	Yes
11	Port Sign	Port1:ANT ; Port2:RX ; Port3:TX

 

 

If you please see my last email to the list, were i describe my actual configuration.

Thank in advance

Cristian

 

 

 

 

 

El 2012-05-09 17:57, wayne roberts escribió:

You should know the gain of your amplifier.
I would suspect that OpenBTS has USRP output power set to high level for direct antenna connection.    This is probably too much for your amplifier.
Try reducing your USRP output power to minimum level, then slowly increase it while observing your amplifier output signal on another receiver.  Be careful of signal overload of your receiver too.

On Wed, May 9, 2012 at 11:44 AM, Cristian Rougier <address@hidden> wrote:

Hello, i'm working in a private project with USRP 1 and OpenBTS on PCS 1900MHZ.

Currently im working with chinesse (Ledmate.net) 25 dbm amplifier and duplexer for pcs 1900,
this works, but i having problems in some areas, i can't register any phones.

Can anybody tell me what is the best amplifiers brand for use in this project ?,
i need to full extend the coverage area.

My current configuration is


USRP1+clock tamer > PCS 25dbm amplifier > PCS duplexer > antenna (yagi or omni 9dbi)


I need any other component? i'm planing to change the amplifier, what is the best and
what better power for full extent coverage and work fine?

I wait your news

Thanks in advance

Regards

Cristian

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