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More Bang for you Buck - RF Cafe Forums
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| mfurman
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Post subject: More Bang for you Buck
Posted: Mon Sep 12, 2005 4:15 pm
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Joined: Mon Sep 12, 2005
4:02 pm
Posts: 3
Location: Washington DC
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Hi all,
I'm interested
in combining the inputs of an S-band signal from
two 1-meter antennas. I was hoping to use separate
LNAs at each antenna, then provide an IF delay line
that could compensate so that the indivdual antenna
feeds could be summed PRIOR to modem input. Can
something like this be done to effectively enhance
the G/T or am I smokin something?
Michael
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kanling |
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Post subject:
Posted: Mon Sep 12, 2005 5:47 pm
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| Colonel |
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Joined: Mon Jul 18, 2005
4:31 pm
Posts: 32
Location: Baltimore, MD
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My first reaction was "Gasp, the signals won't be
in perfect phase!" Then I saw you already planned
for the delay line to bring them together.
I guess the only thing preventing it would be
the delay stability of the LNAs. If the delay line
is fixed, any delay drift in the LNAs would mess
everything up. You'd have to check with the LNA
mfr, I guess.
But actually, I don't think
you would gain anything because I think the SNR
of the signal is basically set by the noise floor
of the LNA. Summing two LNAs together would give
you the noise floor of whichever one is highest.
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Posted 11/12/2012
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