[RFI] Ham Conflict from Building Cellular Repeater?
Christopher E. Brown
cbrown at woods.net
Sat Dec 19 00:24:16 PST 2009
Talk to the wireless engineers at your cell company.
1) Wilson is not known as a top shelf company...
2) That device is 800Mhz only...
CDMA and GSM do use 800Mhz in some cases (re-used TDMA freqs), but a great
deal of it is 1700 or 1900 Mhz...
Example, my employer runs a CDMA network. Most EVDO is now 800Mhz, but
almost all voice/RTT is 1900...
Most large GSM or CDMA networks will be making extensive use of 1700/1900.
From what I hear from the wireless guys (I am a data network guy), some of
the Wilson devices are ok, to be specific, the _plug into the phone_
I have not heard good things about the area amps/repeaters.
I do know we had a number of customers calling for help with various
wilson devices, many were very upset on finding that their "Works on all
generations of CDMA, TDMA, GSM and high-speed data technologies." devices
were 800Mhz only.
In order to support multiple carriers, GSM and CDMA you would need a
quality _tri-band_ (800/1700/1900) rooftop antenna, and low loss (at 2
Ghz) coax down to a tri-band repeater device.
So far as I know, our wireless guys found several dual or tri band amps of
the _plug into the phone_ type, but I never heard about a good repeater
type. Since I am one of 2 people that debug data issues related to CDMA,
I assume I would have heard if they found one. Once of our more common
support requests is people wanting to run multiple phones/data cards at a
mobile work camp or on a fishing vessel and having performance issues.
On Fri, 18 Dec 2009, kd4e wrote:
> Should I anticipate any conflicts between Ham radio and
> this device?
> I need something inside a 1200sf steel building, that also
> includes one internal L-shaped steel wall, which will
> provide cellphone access and this seems the only solution.
> Wilson 801105 50 dB In-Building Wireless Cellular Smart
> Technology Amplifier
> Item comes with FULL 1-year WARRANTY!
> ? Works on all generations of CDMA, TDMA, GSM and high-speed
> data technologies.
> ? Improves data communiciation rates needed for 3G
> ? Automatic gain control up to 50 dB
> ? 2 dB gain step 30-50 dB
> ? Automatic gain adjusting in the event of oscillation
> and/or overload.
> ? Power control logic ensures maximum output power is within
> cellular network standards
> ? Gain indicator lights
> ? Automatic shutdown on overload
> ? FCC and IC type accepted
> Part Number
> 824-849 MHz / 869-894 MHz
> 50 dB
> Max Output Power
> up to 3 watts
> Max RF
> + 30 dBm / + 30 dBm
> Noise Figure
> 3 dB nominal
> ± 2.5 dB
> > 90 dB
> Power Requirements
> 120 V AC 3 A max
> N-Female 50 ohms
> 5.6 x 3.6 x 1.7(inches) / 14.2 x 9.1 x 4.4 (cm)
> 1.5 lbs / 0.7 kg
More information about the RFI