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marques
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RX Signal good, but Tx very poor

Thu Jul 12, 2007 4:49 pm

Hi. Anyone can help me with this problems. I have a link with 18 Km, that has a great signal on RX but a Poor TX signal. Does anyone know what is the problem ?

0 interface=wlan1 radio-name="0080487E9808" mac-address=00:80:48:7E:98:08 ap=yes wds=no rx-rate=18Mbps tx-rate=12Mbps
packets=3692,3234 bytes=536096,2369066 frames=3692,3281 frame-bytes=514232,2350317 hw-frames=3810,3295
hw-frame-bytes=638477,2429425 uptime=55s last-activity=10ms signal-strength=-52dBm@6Mbps signal-to-noise=49dB
strength-at-rates=-52dBm@6Mbps 450ms,-49dBm@9Mbps 4s960ms,-49dBm@12Mbps 380ms,-49dBm@18Mbps 20ms,-52dBm@24Mbps
690ms
tx-signal-strength=-84dBm tx-ccq=48% rx-ccq=45% p-throughput=11315 ack-timeout=144 distance=144 nstreme=no
framing-mode=none routeros-version="2.9.38" last-ip=200.253.218.131 802.1x-port-enabled=yes
authentication-type=none encryption=none compression=no
 
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tgrand
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Re: RX Signal good, but Tx very poor

Thu Jul 12, 2007 5:22 pm

Your Signal Does not look good at all to me!!

signal-strength=-52dBm@6Mbps Too Strong
signal-to-noise=49dB Too Much Noise
tx-signal-strength=-84dBm Too Low
tx-ccq=48% Poor
rx-ccq=45% Even Poorer

Change your channel, or post your settings for all of your wireless interfaces.
Try to balance the signals at each end by adjusting the power levels.
If the difference at each end in power levels is more than 5dB then Increase the antenna height at each end.
 
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mipland
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Re: RX Signal good, but Tx very poor

Fri Jul 13, 2007 11:41 am

signal-strength=-52dBm@6Mbps Too Strong
signal-to-noise=49dB Too Much Noise
Excuse me, but i'm not agree with this.
-52dBm (signal) - 49dBm (SNR) = -101dBm (noise), which is a great noise floor (noise very low).

Bye
 
zl4tar
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Re: RX Signal good, but Tx very poor

Fri Jul 13, 2007 12:54 pm

What does the signal look like from the other end? You might still not be
perfectly aligned with the far antenna, which must be pointing at you correctly
as you're getting a good receive signal.
 
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airstream
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Re: RX Signal good, but Tx very poor

Sat Jul 14, 2007 8:27 am

Indeed, this looks like an alignment issue, rather than a hardware setup.
 
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tgrand
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Re: RX Signal good, but Tx very poor

Tue Jul 24, 2007 2:51 pm

My appologies.
My head was not there as I was looking at signal to noise and it registered as noise floor.

It could be alignment; I would check that first.
Also is the weeker link on top of a tower, if not then what kind of structure?
Are there any other radios and antennas on this structure?

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