Has anyone run into 900 Mhz SMs that show the RX power level varying with air temperature? We’ve got about 20% of our SMs varying by up to 20 dB & there is a very clear correlation with the air temp., unfortunately there is not a clear correlation with board type, mac # or geographic location. The warmer it gets the less the signal leading to jitter,re-registrations & even hours long outages 
. Boards are P10s, sw is mostly 8.2, MACs are all over the place.
H.
Yes.
We notice customers that have slightly marginal signals can start dropping and/or re-registering on hot days.
I have determined that the cause is heat waves and inversions.
The solution is to put more gain at the customer location and raise the antenna. Also firing across a roof line seems to make the problem worse.
I don’t think thats our problem, it’s not that hot here at the moment and the temp & signal curves we’re recording (using Cacti) are following the same smooth daily curves. Also neighboring customers arn’t experiencing the same problems. Good :idea: though .
H.
There was a problem with radios made last year where a bond on the board was not done properly resulting in RF problems. What if you swap the SM with a newer unit?
Jerry Richardson wrote: There was a problem with radios made last year where a bond on the board was not done properly resulting in RF problems. What if you swap the SM with a newer unit?
Unfortunately all the spares we have at the moment are from the same time period as the problem units so we're a little leary of replacing a bad one with another bad one, guess we'll have to order in a fresh batch of late production units & try those.
H.