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Re: [Openbts-discuss] USRP/OpenBTS Extending Range/Coverage Help
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From: john w. <dag...@ho...> - 2013-08-04 08:16:54
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Hello guys,
Thanks for the responses just to let you know it is a 2 x FLEX900 daughterboard setup 1 each for TX/RX and we are currently testing indoors at a university.
We have got another duplexer with similar spec but with more isolation (around 100db), and added a BPF with 30db isolation to the RX side we are also planning to try an variable attenuator to lower the gain of the power amp on the TX side to see if it is a crosstalk noise issue?
Currently we have the cable coming from the antenna through the duplexer hooked up to the INPUT side of the power amplifier and the OUTPUT side going to the Transmit filter into the USRP is this correct or should it be the other way around?
We are using CLF-200 900MHz - 0.326dB/m low loss cables and have checked all pins/heads and made sure they are all connected ok sma-male to female
We get slightly better range with just the duplexer and antenna now around 20-25 meters but surely it should be better?? This decreases for some reason when we add the amps/filters??
Our current readings are
rxgain = 32db
current downlink power 0 dB wrt full scale
current attenuation bounds 0 to 12 dB
Aswell see the log below this was carried out WITHOUT the power amplifier on the TX side as we could not find it but again we only got 10-15 metres range???
command socket path is /var/run/command
rm: cannot remove `/tmp/OpenBTS.console.1929.51fdfea6': No such file or directory
response socket bound to /tmp/OpenBTS.console.1929.51fdfea6
readline installed
Remote Interface Ready.
Type:
"help" to see commands,
"version" for version information,
"notices" for licensing information.
"quit" to exit console interface
OpenBTS> rxgain
current RX gain is 36 dB
OpenBTS> chans
CN TN chan transaction UPFER RSSI TXPWR TXTA CIPHER DNLEV DNBER
CN TN type id pct dB dBm sym en/de dBm pct
0 1 TCH/F 342274087 0.00 -52 19 1 -92 1.13
OpenBTS> noise
noise RSSI is -65 dB wrt full scale
MS RSSI target is -50 dB wrt full scale
OpenBTS> chans
CN TN chan transaction UPFER RSSI TXPWR TXTA CIPHER DNLEV DNBER
CN TN type id pct dB dBm sym en/de dBm pct
0 1 TCH/F 342274087 0.00 -48 25 1 -96 2.26
OpenBTS> chans
CN TN chan transaction UPFER RSSI TXPWR TXTA CIPHER DNLEV DNBER
CN TN type id pct dB dBm sym en/de dBm pct
0 1 TCH/F 342274087 0.00 -52 23 1 -95 2.26
OpenBTS> noise
noise RSSI is -66 dB wrt full scale
MS RSSI target is -50 dB wrt full scale
OpenBTS> noise
noise RSSI is -64 dB wrt full scale
MS RSSI target is -50 dB wrt full scale
OpenBTS> noise
noise RSSI is -66 dB wrt full scale
MS RSSI target is -50 dB wrt full scale
OpenBTS> noise
noise RSSI is -66 dB wrt full scale
MS RSSI target is -50 dB wrt full scale
OpenBTS> chans
CN TN chan transaction UPFER RSSI TXPWR TXTA CIPHER DNLEV DNBER
CN TN type id pct dB dBm sym en/de dBm pct
0 1 TCH/F 342274087 0.00 -48 23 1 -94 1.13
OpenBTS> chans
CN TN chan transaction UPFER RSSI TXPWR TXTA CIPHER DNLEV DNBER
CN TN type id pct dB dBm sym en/de dBm pct
0 1 TCH/F 342274087 0.00 -50 23 1 -95 1.13
OpenBTS> chans
CN TN chan transaction UPFER RSSI TXPWR TXTA CIPHER DNLEV DNBER
CN TN type id pct dB dBm sym en/de dBm pct
0 1 TCH/F 342274087 0.00 -50 27 1 -95 2.26
OpenBTS> chans
CN TN chan transaction UPFER RSSI TXPWR TXTA CIPHER DNLEV DNBER
CN TN type id pct dB dBm sym en/de dBm pct
0 1 TCH/F 342274087 0.00 -53 25 1 -95 2.26
OpenBTS> chans
CN TN chan transaction UPFER RSSI TXPWR TXTA CIPHER DNLEV DNBER
CN TN type id pct dB dBm sym en/de dBm pct
0 1 TCH/F 342274087 0.00 -50 23 1 -94 2.26
OpenBTS> chans
CN TN chan transaction UPFER RSSI TXPWR TXTA CIPHER DNLEV DNBER
CN TN type id pct dB dBm sym en/de dBm pct
0 1 TCH/F 342274087 0.00 -49 25 1 -94 2.26
OpenBTS> chans
CN TN chan transaction UPFER RSSI TXPWR TXTA CIPHER DNLEV DNBER
CN TN type id pct dB dBm sym en/de dBm pct
0 1 TCH/F 342274087 0.00 -50 27 1 -95 2.26
OpenBTS> chans
CN TN chan transaction UPFER RSSI TXPWR TXTA CIPHER DNLEV DNBER
CN TN type id pct dB dBm sym en/de dBm pct
0 1 TCH/F 342274087 0.00 -51 27 1 -95 2.26
OpenBTS> chans
CN TN chan transaction UPFER RSSI TXPWR TXTA CIPHER DNLEV DNBER
CN TN type id pct dB dBm sym en/de dBm pct
0 1 TCH/F 342274087 0.00 -51 25 1 -95 2.26
OpenBTS> chans
CN TN chan transaction UPFER RSSI TXPWR TXTA CIPHER DNLEV DNBER
CN TN type id pct dB dBm sym en/de dBm pct
0 1 TCH/F 342274087 0.00 -49 25 1 -94 2.26
OpenBTS> chans
CN TN chan transaction UPFER RSSI TXPWR TXTA CIPHER DNLEV DNBER
CN TN type id pct dB dBm sym en/de dBm pct
0 1 TCH/F 342274087 0.00 -50 27 1 -95 2.26
OpenBTS> power
current downlink power 0 dB wrt full scale
current attenuation bounds 0 to 12 dB
OpenBTS> power
current downlink power 0 dB wrt full scale
current attenuation bounds 0 to 12 dB
OpenBTS> chans
CN TN chan transaction UPFER RSSI TXPWR TXTA CIPHER DNLEV DNBER
CN TN type id pct dB dBm sym en/de dBm pct
OpenBTS> ^C ^C
^C
sudo ./OpenBTSCLI
command socket path is /var/run/command
rm: cannot remove `/tmp/OpenBTS.console.2079.51fe004e': No such file or directory
response socket bound to /tmp/OpenBTS.console.2079.51fe004e
readline installed
Remote Interface Ready.
Type:
"help" to see commands,
"version" for version information,
"notices" for licensing information.
"quit" to exit console interface
OpenBTS> chans
CN TN chan transaction UPFER RSSI TXPWR TXTA CIPHER DNLEV DNBER
CN TN type id pct dB dBm sym en/de dBm pct
0 1 TCH/F 203521258 0.00 -49 5 1 -79 0.00
OpenBTS> chans
CN TN chan transaction UPFER RSSI TXPWR TXTA CIPHER DNLEV DNBER
CN TN type id pct dB dBm sym en/de dBm pct
0 1 TCH/F 203521258 0.00 -49 5 1 -78 0.00
OpenBTS> power
current downlink power 0 dB wrt full scale
current attenuation bounds 0 to 12 dB
OpenBTS> noise
noise RSSI is -64 dB wrt full scale
MS RSSI target is -50 dB wrt full scale
OpenBTS> noise
noise RSSI is -65 dB wrt full scale
MS RSSI target is -50 dB wrt full scale
OpenBTS> noise
noise RSSI is -64 dB wrt full scale
MS RSSI target is -50 dB wrt full scale
OpenBTS> chans
CN TN chan transaction UPFER RSSI TXPWR TXTA CIPHER DNLEV DNBER
CN TN type id pct dB dBm sym en/de dBm pct
0 1 TCH/F 203521258 0.00 -49 5 1 -79 0.00
OpenBTS> chans
CN TN chan transaction UPFER RSSI TXPWR TXTA CIPHER DNLEV DNBER
CN TN type id pct dB dBm sym en/de dBm pct
0 1 TCH/F 203521258 0.00 -49 5 1 -80 0.00
OpenBTS> chans
CN TN chan transaction UPFER RSSI TXPWR TXTA CIPHER DNLEV DNBER
CN TN type id pct dB dBm sym en/de dBm pct
0 1 TCH/F 203521258 0.00 -49 5 1 -80 0.00
OpenBTS> chans
CN TN chan transaction UPFER RSSI TXPWR TXTA CIPHER DNLEV DNBER
CN TN type id pct dB dBm sym en/de dBm pct
0 1 TCH/F 203521258 0.00 -49 5 1 -80 0.00
OpenBTS> chans
CN TN chan transaction UPFER RSSI TXPWR TXTA CIPHER DNLEV DNBER
CN TN type id pct dB dBm sym en/de dBm pct
0 1 TCH/F 203521258 0.00 -49 5 1 -80 0.00
OpenBTS> chans
CN TN chan transaction UPFER RSSI TXPWR TXTA CIPHER DNLEV DNBER
CN TN type id pct dB dBm sym en/de dBm pct
0 1 TCH/F 203521258 0.00 -49 5 1 -80 0.00
OpenBTS> chans
CN TN chan transaction UPFER RSSI TXPWR TXTA CIPHER DNLEV DNBER
CN TN type id pct dB dBm sym en/de dBm pct
0 1 TCH/F 203521258 0.00 -49 5 1 -80 0.00
OpenBTS> rxgain 40
current RX gain is 36 dB
new RX gain is 40 dB
OpenBTS> chans
CN TN chan transaction UPFER RSSI TXPWR TXTA CIPHER DNLEV DNBER
CN TN type id pct dB dBm sym en/de dBm pct
0 1 TCH/F 203521258 0.00 -55 5 1 -80 0.57
OpenBTS> chans
CN TN chan transaction UPFER RSSI TXPWR TXTA CIPHER DNLEV DNBER
CN TN type id pct dB dBm sym en/de dBm pct
0 1 TCH/F 203521258 0.00 -50 9 1 -80 0.00
OpenBTS> chans
CN TN chan transaction UPFER RSSI TXPWR TXTA CIPHER DNLEV DNBER
CN TN type id pct dB dBm sym en/de dBm pct
0 1 TCH/F 203521258 0.00 -52 7 1 -80 0.00
OpenBTS> chans
CN TN chan transaction UPFER RSSI TXPWR TXTA CIPHER DNLEV DNBER
CN TN type id pct dB dBm sym en/de dBm pct
0 1 TCH/F 203521258 0.00 -51 9 1 -80 0.00
OpenBTS> chans
CN TN chan transaction UPFER RSSI TXPWR TXTA CIPHER DNLEV DNBER
CN TN type id pct dB dBm sym en/de dBm pct
0 1 TCH/F 203521258 0.00 -50 9 1 -80 0.57
OpenBTS> rxgain 32
current RX gain is 40 dB
new RX gain is 32 dB
OpenBTS> chans
CN TN chan transaction UPFER RSSI TXPWR TXTA CIPHER DNLEV DNBER
CN TN type id pct dB dBm sym en/de dBm pct
0 1 TCH/F 203521258 4.75 -61 9 1 -80 0.57
OpenBTS> chans
CN TN chan transaction UPFER RSSI TXPWR TXTA CIPHER DNLEV DNBER
CN TN type id pct dB dBm sym en/de dBm pct
0 1 TCH/F 203521258 0.02 -54 19 1 -80 0.00
OpenBTS> chans
CN TN chan transaction UPFER RSSI TXPWR TXTA CIPHER DNLEV DNBER
CN TN type id pct dB dBm sym en/de dBm pct
0 1 TCH/F 203521258 0.00 -54 15 1 -80 0.00
OpenBTS> chans
CN TN chan transaction UPFER RSSI TXPWR TXTA CIPHER DNLEV DNBER
CN TN type id pct dB dBm sym en/de dBm pct
0 1 TCH/F 203521258 0.00 -48 17 1 -80 0.00
OpenBTS> chans
CN TN chan transaction UPFER RSSI TXPWR TXTA CIPHER DNLEV DNBER
CN TN type id pct dB dBm sym en/de dBm pct
0 1 TCH/F 203521258 0.00 -51 21 1 -80 0.00
OpenBTS> chans
CN TN chan transaction UPFER RSSI TXPWR TXTA CIPHER DNLEV DNBER
CN TN type id pct dB dBm sym en/de dBm pct
0 1 TCH/F 203521258 0.00 -54 17 1 -80 0.00
OpenBTS> chans
CN TN chan transaction UPFER RSSI TXPWR TXTA CIPHER DNLEV DNBER
CN TN type id pct dB dBm sym en/de dBm pct
0 1 TCH/F 203521258 0.00 -48 15 1 -80 0.00
OpenBTS> chans
CN TN chan transaction UPFER RSSI TXPWR TXTA CIPHER DNLEV DNBER
CN TN type id pct dB dBm sym en/de dBm pct
0 1 TCH/F 203521258 0.00 -48 21 1 -80 0.00
OpenBTS> chans
CN TN chan transaction UPFER RSSI TXPWR TXTA CIPHER DNLEV DNBER
CN TN type id pct dB dBm sym en/de dBm pct
0 1 TCH/F 203521258 0.00 -52 17 1 -80 0.00
OpenBTS> chans
CN TN chan transaction UPFER RSSI TXPWR TXTA CIPHER DNLEV DNBER
CN TN type id pct dB dBm sym en/de dBm pct
0 1 TCH/F 203521258 0.00 -50 17 1 -80 0.00
OpenBTS> chans
CN TN chan transaction UPFER RSSI TXPWR TXTA CIPHER DNLEV DNBER
CN TN type id pct dB dBm sym en/de dBm pct
0 1 TCH/F 203521258 0.00 -48 21 1 -80 0.00
OpenBTS> chans
CN TN chan transaction UPFER RSSI TXPWR TXTA CIPHER DNLEV DNBER
CN TN type id pct dB dBm sym en/de dBm pct
0 1 TCH/F 203521258 0.00 -52 21 1 -80 0.00
OpenBTS> chans
CN TN chan transaction UPFER RSSI TXPWR TXTA CIPHER DNLEV DNBER
CN TN type id pct dB dBm sym en/de dBm pct
0 1 TCH/F 203521258 0.00 -51 17 1 -80 0.00
OpenBTS> chans
CN TN chan transaction UPFER RSSI TXPWR TXTA CIPHER DNLEV DNBER
CN TN type id pct dB dBm sym en/de dBm pct
0 1 TCH/F 203521258 0.00 -48 19 1 -80 0.00
OpenBTS> chans
CN TN chan transaction UPFER RSSI TXPWR TXTA CIPHER DNLEV DNBER
CN TN type id pct dB dBm sym en/de dBm pct
0 1 TCH/F 203521258 0.00 -52 19 1 -80 0.00
OpenBTS> power
current downlink power 0 dB wrt full scale
current attenuation bounds 0 to 12 dB
OpenBTS> rxgain
current RX gain is 32 dB
OpenBTS> chans
CN TN chan transaction UPFER RSSI TXPWR TXTA CIPHER DNLEV DNBER
CN TN type id pct dB dBm sym en/de dBm pct
0 1 TCH/F 203521258 0.00 -51 21 1 -79 0.00
OpenBTS> chans
CN TN chan transaction UPFER RSSI TXPWR TXTA CIPHER DNLEV DNBER
CN TN type id pct dB dBm sym en/de dBm pct
0 1 TCH/F 203521258 0.00 -52 17 1 -80 0.00
Date: Tue, 23 Jul 2013 21:38:55 +0200
From: gul...@co...
To: ope...@li...
Subject: Re: [Openbts-discuss] USRP/OpenBTS Extending Range/Coverage Help
I concur,
Range is at least 200 m, limited by TX power. I have made a few
folded dipoles for the TX side, this compresses the radiation
diagram vertically, to give less range up or down and more gain in
the horizontal plane.
Combined with a single RX dipole, and careful adjustment of
RXGain, in excess of 200 m is easily done.
Gullik
On 07/23/2013 12:28 PM, Ralph A. Schmid, dk5ras wrote:
Believe me, this crosstalk problem is nothing
but a rumor from someone who did not understand the
difference between crosstalk when using one frequency vs.
using two frequencies. In fact I cover 200 m with a standard
WBX and two directly attached small antennae without any
problems when using GSM1800 with its large uplink/downlink
spacing. At a demonstration a few weeks ago it was no
problem to cover three floors of a conference center with
only a few mW of output power.
The OP must have some error in his setup, maybe
mixing up downlink/uplink or input/output. Or some bad
cable, bent connector pin, whatever.
Ralph.
From:
Kurtis Heimerl [mailto:khe...@cs...]
Sent: Monday, July 22, 2013 6:52 PM
To: Derek Wells
Cc: ope...@li...
Subject: Re: [Openbts-discuss] USRP/OpenBTS
Extending Range/Coverage Help
Oh this is one daughterboard? My
understanding is that there's a lot of crosstalk on the
board with one daughterboard, that's going to limit your
coverage a lot. Also may explain why the duplexer does so
little.
On Mon, Jul 22, 2013 at 9:49 AM,
Derek Wells <der...@gm...>
wrote:
John,
Can you discern whether you are uplink or downlink
limited?
That is, is your range limitation due to a transmitter
problem or a receiver problem? And furthermore, is it
the on phone end (unlikely) or the USRP end of the up or
downlink?
It sound like you are working off of one daughterboard,
is that correct?
-99 dBm sounds pretty low at 15 meters with a Yagi (like
Kurtis said). Consider using the "noise" and "power"
commands from the CLI and providing some numbers back to
the forum.
And because I've done it before with other
systems...check each RF connection and cable to make
sure you have a male pin mated with a female socket at
every connection, and not two female sockets...it
happens.
Derek
On Sat, Jul 20, 2013 at 1:37
AM, Kurtis Heimerl <khe...@cs...>
wrote:
There's something wrong with
your USRP, you should certainly get more than 15
meters with a USRP1 and a 12db Yagi.
On Sat, Jul 20, 2013 at
1:20 PM, john wake <dag...@ho...>
wrote:
Hello
guys,
We are having trouble extending the
range of our USRP1 which is running
OpenBTS I really hope someone can
help our current setup is as follows
RX = Antenna -> Duplexer ->
LNA -> USRP
TX = Same antenna -> Same
duplexer -> Power Amplifier ->
Fullband Transmit Filter -> USRP
When we try running the USRP with
just the antenna we get a range of
around max 10-15 meters the phone
showing -99dBM when we add the power
amp the range increases by a few
meters however when we also add the
LNA so we have both the LNA + power
amp connected at the same time
this is when the range decreases to
around 5 meters.
We would be happy if we were able to
cover 1/2 mile or anything near this
range we do have a temporary license
to transmit in our frequency however
this expires in 2 months.
There has been quite a bit spent on
equipment so far trying to extend
the range with no luck it seems the
USRP is made only to work at a very
short range so any help on how to do
this would be very much appreciated.
Also would adding a bandpass filter
to the RX side make any difference?
The spec of equipment we are using
is as follows
900 Mhz 12 dBi Yagi antenna
Frequency（MHz）824~960MHz
Length:55cm
SWR ≤≤1.5
Input Impedance-Ω: 50
Horizontal Beamwidth -°
:54/48/40/36/30
Vertical Beamwidth -°
:48/40/36/32/30
Maximum Power -W :100
Bandwidth-MHz :154/154/154/140/120
Duplexer
30 W GSM Duplexer TX
RX
Pass Band 925 - 960 MHz
880 - 915 MHz
Insertion Loss 1.0 dB 1.0 dB
Passband Ripple 0.2 dB
0.2 dB
Rejection 50 dB @ 80-850
MHz 50 dB @ 80-800 MHz
50 dB @ 1-3 GHz
50dB @ 1-3 GHz
Return Loss minimum 20 dB
Impedance 50 Ohms
Coupling Port -30 dB (+/- 1.5
dB)
Power 30 W average RF
poewr
LNA
Parameter Unit Minimum Typical
Maximum
Frequency Range MHz 850 950
Small Signal Gain dB 40 41
Output Power Pout @ Pin = 0dBm dBm
+40
Saturated Power Psat @ Pin = +5dBm
dBm +42
IP3 dBm +50
Reverse Isolation dB -75
Efficiency at Pout = +40dBm % 38
VSWR Input 1.4:1
DC Power Supply V +12
Power Amp
775-950 Mhz
40 dB gain
+18 dBm
Filter
Passband: 925-960 MHz
Passband Insertion Loss: 1.5 dB
maximum
Rejection:
DC-915 MHz 80 dB minimum
1000-2880 MHz 60 dB minimum
Passband Return Loss: 15 dB minimum
Maximum Power Handling:
CW 10 watts
Peak Instantaneous 40 watts
Intermodulation Products: -110 dBm
maximum
with two +34 dBm carriers
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