[time-nuts] Re-radiating a GPS signal...??

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GPS being extremely time-dependent, any delay introduced will affect 
positioning precision. Also, the signal is too weak for such an 
amplification/echo cancelling signal chain.
Passive relaying, or using at most a simple amplifier with low enough 
gain, and short signal delay, remain the only feasible concepts.

On 4/12/2012 4:48 PM, Azelio Boriani wrote:
> Passive UHF TV repeaters were in use in Italy too. Nowadays, for the DVB-T
> TV, active gap-fillers are used instead. Active gap-fillers are
> same-channel repeaters with the necessary, sophisticated echo suppression
> technique. We have developed our echo suppression signal processor on a
> Xilinx Virtex5 FPGA: maybe something similar may be done for the GPS CDMA.
>
> On Thu, Apr 12, 2012 at 3:29 PM, Alan Melia<alan.melia at btinternet.com>wrote:
>
>> If the isolation is good and the "clear view" signal is reasonably strong,
>> the passive system works well in hangers, metalclad warehouses, ferry lorry
>> decks.
>> The passive system in the UK used to be refered to as the "Matlock
>> Repeater".
>>
>> Alan
>> G3NYK
>>
>> ----- Original Message -----
>> From: "Michael Baker"<mpb45 at clanbaker.org>
>> To:<time-nuts at febo.com>
>> Sent: Thursday, April 12, 2012 2:05 PM
>> Subject: [time-nuts] Re-radiating a GPS signal...??
>>
>>
>>> Time-nutters--
>>>
>>> So--  How do GPS signal re-radiators work?
>>>
>>> How do you place a GPS antenna on top of a building,
>>> pick up the signal with an LNA, amplify it to re-transmit
>>> on an inside antenna without the amplified re-transmitted
>>> signal getting back into the roof-top receiving antenna?
>>>
>>> I can see circumstances where a huge metal building
>>> (aircraft hangar?) might provide enough isolation to
>>> prevent problems, but in many cases I wonder about it...
>>> ----------------------------
>>>
>>> As an aside note-- I recall seeing, many years ago, a totally
>>> passive TV signal repeater on top of a tall hill in mountainous
>>> territory relaying a TV station signal to some homes in a valley
>>> just below.  The passive repeater consisted of an array of
>>> high-gain UHF yagis pointing to the 40 mile distant TV station tower.
>>> The yagi array was coupled to another set of high-gain yagi
>>> antennas pointing down to the homesites in the valley.  I was
>>> told that it worked pretty well.
>>>
>>> Mike Baker
>>> ----------------------
>>>
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