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P

Phil Allison

Jan 1, 1970
0
What is the cheapest way to add a 250 ms delay to an analog signal that
goes up to 80 MHz?


** Easy - send it up to a geostationary satellite and back.

45,000 / 186, 000 = 0.242 mS


But YOU knew that already ;-)





......... Phil
 
J

jasen

Jan 1, 1970
0
What is the cheapest way to add a 250 ms delay to an analog signal that
goes up to 80 MHz?

if you can digitise it fast enough (LCD displays seem to manage signals in
that ballpark) you'd need (I think) 160 megabytes of RAM to buffer 250ms
worth of data with 8-bit resolution.

Given the usage pattern the scanning of addresses could be done in a way
which would keep dynamic RAM refreshed, but static RAMS are availabe in
apropriate sizes too.


Bye.
Jasen
 
J

Jamie

Jan 1, 1970
0
What is the cheapest way to add a 250 ms delay to an analog signal that
goes up to 80 MHz?
there is no cheap way..
for 80 mhz, you would have to have a fast ADC unit and lots of serial
memory, i mean lots of it. and then a DAC converter//
or put a Sat repeater in space.
 
B

Bob Masta

Jan 1, 1970
0
What is the cheapest way to add a 250 ms delay to an analog signal that
goes up to 80 MHz?

A quarter second seems like an awful long delay at these frequencies.
Can you divulge what this is for? Maybe someone can suggest
another approach.

Best regards,



Bob Masta
dqatechATdaqartaDOTcom

D A Q A R T A
Data AcQuisition And Real-Time Analysis
www.daqarta.com
Home of DaqGen, the FREEWARE signal generator
 
J

Jamie

Jan 1, 1970
0
Is a sampling rate of 160 million samples per second enough?

How do you know what is enough?
now it all depends on what your doing with this
signal ?
are we simply delaying it only or are we examining
the signal also ?
using FFT you need a min of 2 samples to
regenerate the 80 mhz later on.
and also , there is the problem of resolution.
the highest bit Decoder is needed if this
is a complex signal ?
your talking about a lot of expensive components.
 
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