900 mhz Canopy and 900 mhz phone interference

We have a customer that we have been having connection issues (dropping) with since we did the install. He is about 4 miles out and pushing through some trees.


Software Version : CANOPY 7.2.9 Jul 23 2005 01:49:03
Software Boot Version : CANOPYBOOT 3.0
FPGA Version : 070605 (DES Sched) P9
Session Timeout: 0, AirDelay 150 (approximately 4.18 miles (22050 feet))
Session Count: 531, Reg Count 366, Re-Reg Count 165
RSSI (Avg/Last): 1609/1600 Jitter (Avg/Last): 4/4 Power Level (Avg/Last): -66/-66
DnRate(S): 256 DnLimit(S): 512 UpRate(S): 256 UpLimit(S): 512 (kbit)
LoUpCIR(S): 0 LoDnCIR(S): 0 (kbps)
Rate : VC 32 Rate 1X/1X

After about 3-4hrs of testing at customers house I noticed his SM would drop when they got on the telephone. They are using an older GE 900 mhz cordless phone. I did some testing with it and as soon as I pushed “Talk” on the phone my pings would time out, hang the phone up and 2 or 3 pings later the connection was good. So do we have a work around for this besides telling the customer to go get 2.4 cordless phone? Thanks…

BTW: The AP he is connecting to is on the 924 freq…

I’ve seen the same thing, and there is no real solution.

The farther away from the house the SM is, the less the phone will make an impact. One customer of ours has a 900MHz phone. We planted a 12’ 4x4 about 150’ away from his house and mounted the SM on that (to clear the LOS of some heavy trees near the house). This guy does not have a problem with his phone interfering.

If you are mounting the SM to the house though, forget it.
900 phone + 900 Canopy = not gonna work together.

RNSOSP wrote:

So do we have a work around for this besides telling the customer to go get 2.4 cordless phone? Thanks....

BTW: The AP he is connecting to is on the 924 freq....

We installed a customer at about 250' from his house to get away from his cordless telephone. No Joy! When he brought up his telephone, his link dropped.

The Canopy hardware is sensitive to the entire 902-928 MHz spectrum, no matter what channel it is tuned to. Any other RF in the 900 MHz ISM spectrum *will* be heard at the SM. Whether or not it takes the link down is not so easily predicted.

I have four customers along a 150 yard stretch of road about 1/8 mile from our tower. The received signal at them varies from about -59 dBm to -65 dBm. They are in a line and spaced like this.


The X's have sever interference, the O's do not. The middle two are about 25 years apart.

900 MHz RFI can be very localized and very sever at the same time.
http://www.walmart.com/catalog/product. ... id=3636753

Just to toss it out there…

Someone mentioned in the past that they have seen 2.4 GHz and 5.8 GHz phones that have another 900 MHz radio built into them. I think they said that the 900 MHz was used for a built in intercom feature while the 2.4 or 5.8 was used for the phone to base station communication. Just something to keep in mind.