[linrad] Linrad gain programming (hardware side) / Linrad-TX

['Zaba' OH1ZAA <dlc.fi; zaba@xxxxxxxxxxxxxxxx>]

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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