Jim Sky 4/28/00
Click here for pics of Kerry Smith using his version at Astronomy Day outing.
The University of Indianapolis site has some more details.
For the past year I have been experimenting with the 18-inch DDS dish
antennas. The dish and LNB , (combination of a low noise amplifier and block
downconverter ed.), have no problem detecting the difference between
cold sky, the Sun, warm bricks or a personís body. I needed a simpler
IF/Detector unit and had planned to use the one from the SARA 408 MHz receiver.
Kerry Smith informed me of a Channel Master Model 1004IFD tuning meter
that met all these needs and provided an audible tuning indicator the same
as the SARA post processor.
The unit works great! With zero on the meter for a cold sky, it is full scale on the Sun and about 1/2 scale for a human or 300 deg. K.
Here is a photo of the LBT ( Little Bitty Telescope). Note the offset
feed like the GBT, (Green Bank Telescope ed.), and where the shadow of the Sun must be for peak output.
The Channel Master Model 1004IFD tuning meter available from www.satwarehouse.com
is shown below. The unit is $99 plus shipping. Kerry found a similar
model number unit from www.starkelectronic.com
for $75 but it appears to be an older model. I did not research this. The www.satwarehouse.com unit is shown below with a full-scale deflection
from the sun. (Also
check out this unit pointed out the Indy site. )
The 12 GHz LNB is installed in the 5 meter dish shown in the Sept/Oct98
SARA newsletter. I did not have the tuning meter when we were checking
out the unit, but I am sure it will work better than the IF strip constructed.
(This was not the SARA IF strip) The output of the tuning meter can be
fed into your computer. Kerry noted that the coil in the meter movement
would pick up movement of the
unit by detecting changes in the earthís magnetic field, so you may want to replace the meter with a resistor that can be switched in and out of the circuit.
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