Linrad is actually a quite remarkable system regarding gain control
as it seems
to be able to cope with most situations without need to change the hardware
configuration either with attenuators or any AGC-action. At least in
my private
50 MHz experiments with a simple I/Q-direct receiver I have never come across
a signal level situation where any change in the basic gain layout was needed.
Just in case more dynamic range is needed in Linrad hardware or other
I/Q-systems
I would like to point to a new product by National Semiconductor that
will allow a
precise adjustment in gain in two or more channels, if needed. The
LMP 8100 allows
24 dB gain regulation with 0.03% precision. Close gain tracking
between channels is
beneficial in (multiple) I/Q-systems as there will be no need for
re-calibration when
jumping between gain settings. Its noise performance is very similar
to fixed gain
amplifiers and its slew rate is excellent with a 33 MHz unity gain bandwidth.
http://www.national.com/pf/LM/LMP8100.html (with a link to .PDF-specs)
It is good to see the new development on the Linrad transmit side
with lir02-36.
http://www.nitehawk.com/sm5bsz/linuxdsp/lintx.htm
73, "Zaba" OH1ZAA
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