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Re: [RFI] Ham Conflict from Building Cellular Repeater?

To: kd4e <doc@kd4e.com>
Subject: Re: [RFI] Ham Conflict from Building Cellular Repeater?
From: "Christopher E. Brown" <cbrown@woods.net>
Date: Sat, 19 Dec 2009 02:24:16 -0600 (CST)
List-post: <rfi@contesting.com">mailto:rfi@contesting.com>

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_ types.

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

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