[RFI] Passive Cellphone Repeater?

[Mike Fatchett W0MU]

http://www.wilsonelectronics.com/ProductDetails.aspx?Product=19&title=Small+Office+%2f+Home+Office+%E2%80%93+SOHO+%28801245%29&Category=9

Why passive? Link above is for an active repeater.

On 4/17/2011 12:28 PM, Christopher Brown wrote:
>
> On 4/17/11 10:06 AM, doc at kd4e.com wrote:
>>> Go spend about about $100 on a small UPS.
>> $39.95 on sale at OfficeMax today.  :-)
>>
>>> Passive is possible, but you would need.
>>>
>>> Exterior and interior antennas matched to the bands used by the cell
>>> carrier.  Note, _bands_, not band.  Most carriers will be running one
>>> high, one low (example, 800/1900), but the specifics vary with
>>> technology type (GSM v.s. CDMA) and specific carrier.
>> Verizon.
>>
>>> A very short run or very low loss coax (low loss at up to 2Ghz).
>> OK.
>>
>>> Ideal external antenna placement.
>> Not a problem putting a beam outside and pointing it SE at the
>> tower.
> Generally you would need to not only be able to eyeball the tower, but
> have a clear fresnel zone.
>
>
> If not you might need to fall back to using the external antenna port on
> the phone.
>
>>> A _very_ strong signal.
>> More elements, at these frequencies there's not much weight or
>> wind-resistance ...
>>
>> I can homebrew a beam and I have a variety of coax from flexible
>> hardline w/N-type connectors, low-loss coax w/SMA's, and the usual
>> Ham coax.  The length will be fairly short.
>>
>>> 2) Farther away with perfect line of sight to the tower with a well
>>> aimed high-gain directional on roof.
>> # 2 would be the situation.
>>
>> Sounds like a fun challenge ... as time permits.
>>
>> Thanks!
>>
>> doc
>>
>>
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