Nat Semi App Note 72 page 18, par. 6.4 shows the configuration for bandpass
active filter. This matches the last LM3900 stage, so you would seem to be
correct. The shift in filter frequency for 200bps is because the higher
modulation rate results in a greater frequency shift. It's like 50hz
I am presently downsizing and that has also resulted in shrinking my HP 70
000 series spectrum analyzer. Out with the 70310A OCXO reference. The unit
has a McCoy OSC92-13B OCXO. The original price was $ 5000 and the option
with out OCXO was a $ 2500 saving. Some OCXO. Does any one have any
I may build up the d-msk-r tracor circuit.
I seriously speculate it works as follows.
Tracor down converts NAA's signal to a 100 Hz IF.
The NAA signal is plus and minus 50 Hz msk or FSK
Making the mark 50 Hz and space 150 Hz. (Really don't know whats mark or
space nor does it matter)
The tracor
Paul wrote:
Nat Semi App Note 72 page 18, par. 6.4 shows the configuration for
bandpass active filter. This matches the last LM3900 stage, so you
would seem to be correct. The shift in filter frequency for 200bps
is because the higher modulation rate results in a greater frequency
shift.
Is anyone paying attention to all the chatter about the lost aircraft
MH370, Inmarsat's supposed flight tracks based on 6 or 7 pings (1 per
hour), the Doppler shift (BFO) and transaction timing (BTO) etc??
Basically from my perspective they are putting too much stock into the
Doppler which
I thought that Inmarsat terminals had AFC to the sat's down-link. Not to the
degree of true phase-lock like DSN has but enough so that the sat's abillity to
do doppler correction on the uplink is valid to help with BER, etc... Otherwise
the doppler correction would be of no help and not be
Because of the bent pipe transponder there is a doppler shift on the
uplink from the terminal in the aircraft and doppler on the downlink
from the satellite. Each has to be calculated differently because of the
relative motion of the satellite (to ground station and aircraft) and
the gross
In message 53f268cf.80...@leikhim.com, Joe Leikhim writes:
My point is that, all of the discussion I have read ignores the
possibility that [...]
The major point being ignored is that the terminal in the plane
does a signon after approx 45-60 minutes (can't remember exact
duration --
On Mon, Aug 18, 2014 at 04:18:30PM -0400, Brian, WA1ZMS wrote:
I thought that Inmarsat terminals had AFC to the sat's down-link. Not
to the degree of true phase-lock like DSN has but enough so that the
sat's abillity to do doppler correction on the uplink is valid to help
with BER, etc...
I am just speculating that this oscillator was used
instead of the 10811 because the 10811 would not fit.
Therefore, it would NOT be used in other equipment.
I would guess the specs would be similar to the 10811.
The 70,000 series had some general purpose power bus
that the McCoy would have to
On Fri, 04 Jul 2014 02:35:41 +0100, you wrote:
Hi Bert,
I am thinking about testing a heat pipe on a fan cooled setup I use.
The first temp controlled chassis I did used a peltier and works very
well, but was a lot more work to do and is much more power hungry.
The main problem I find is not
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