|Subject:||Re: [Discuss-gnuradio] Amplifier|
|Date:||Wed, 9 May 2012 18:00:48 -0700|
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).
AMPLIFIERShenzhen Ledmate Technology Co., Ltd.
PCS Signal Booster
*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
*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
Frequency Range (Mhz): Downlink :1930-1990MHz Uplink:1850-1910MHz
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)
Tri-rank intermodulation ≤-40dBc(PO=25dBm/CH/2CH)
band flatness PCS1900≤±5
Relay Phone PCS
Cover area 1000sq.m
Install Methods Lay/ Hanging(Indoor)
Power supply AC220V(Expert AC-DC Convertor)(Facility Power Supply:DC+5V)
Weight Approx. 1.2 kg
Fittings DC+5V/3Apower adapter ; Instruction
High-reliability Comply with GB6993-86 standard
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
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
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