[MLB-WIRELESS] Reflectors and Repeaters

[Hamish Moffatt]

Roger, an interesting mathematic analysis. Whilst I was at
university I should probably have learnt to derive something
similar!

On Thu, Jan 03, 2002 at 10:38:32PM +1100, Roger Venning wrote:
> 
> No, adding the two antenna gain & subtracting connecting cable loss is 
> certainly not correct. This set up is certainly feasible though. I have 

I'm still at a loss as to why this is incorrect though. I need
a plain English explanation.

A typical point to point link analysis is:

Tx power (dBm) 
+ Tx feedline loss (dB) 
+ Tx antenna gain (dB)
+ path loss (dB) 
+ Rx antenna gain (dB).

(Losses expressed as negative numbers). Why isn't the passive
repeater situation as simple as:

Tx power (dBm) 
+ Tx feedline loss (dB) 
+ Tx antenna gain (dB)
+ path loss between transmitter and repeater (dB) 
+ repeater Rx antenna gain (dB)
+ repeater feedline loss (dB)
+ repeater Tx antenna gain (dB)
+ path loss between repeater and receiver (dB)
+ Rx antenna gain (dB)

What have I missed?


regards,
Hamish
-- 
Hamish Moffatt VK3SB <hamish at debian.org> <hamish at cloud.net.au>

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