[RFI] Passive Cellphone Repeater?
Mike Fatchett W0MU
w0mu at w0mu.com
Sun Apr 17 14:58:23 PDT 2011
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.
>>> A very short run or very low loss coax (low loss at up to 2Ghz).
>>> Ideal external antenna placement.
>> Not a problem putting a beam outside and pointing it SE at the
> 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.
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