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 <[email protected] [3]> 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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