Interference shouldn't cause a drop in DB level.
Matthew Jenkins
SmarterBroadband
m...@sbbinc.net
530.272.4000
On 11/21/2014 09:47 AM, David via Af wrote:
That or neighbouring wisp with other gear.
�
On 11/21/2014 10:27 AM, Jerry Richardson via Af wrote:
That my first guess as well, alignment.
�
*From:*Af [mailto:af-boun...@afmug.com] *On Behalf Of *Bill Prince via Af
*Sent:* Friday, November 21, 2014 8:24 AM
*To:* af@afmug.com
*Subject:* Re: [AFMUG] What can cause Rx signal drop like this on 900 SM
�
We have seen this when a tree or branch fell on the SM.� Saw
something like this when the SM was mounted on a tree and the tree
fell down (amazingly, the SM stayed registered, even though the yagi
was pointing into the ground).
bp
<part-15@SkylineBroadbandService>
�
On 11/21/2014 7:12 AM, Paul Conlin via Af wrote:
Attached Cacti plots show a sudden and significant drop in Rx
signal from -56 to -65 around 10pm yesterday.� What can cause
such a change?� The graphic shows 24 hours.� The SM says it
has been registered for 21 hours since we rebooted AP to change
channel so the gap in the middle is not a re-reg.� Must be a
sample Cacti missed or is it?� Is it a coincidence this missing
sample happens right when the signal level changes?� This is a
P10 900 SM.� SM and AP running 13.1.3.� Link test is
currently 100x100.� 0.3 miles from AP through some trees.�
Very rural location.� AP at 65 feet AGL.� SM at 25 feet.�
Eight other SMs on this same AP show absolutely no change in
their signals when this specific SM has such a dramatic
change.� Nothing special about weather last night.� This SM
has been having these Rx signal swings for about 3 weeks.� AP
has SM Tx power control set to -64.
�
On the previous channel it would drop when signal was at lower
tier so we made this channel change.� None of the SMs hint at
interference on any channel although another SM showed signs of
interference too.� Our next closest 900 AP is 8.1 miles.�
This SM reports beacon from only one AP.� All AP�s are GPS
synced.
�
�
PC
Blaze Broadband
�
�
