Heating Facility Transmitter

last update:16jun15
Sections:

Terminology:

Intro: (top)

    Page to keep track of heating facility (hf)  calibration.
Tx Names: 1 through 6.

There is a 100 kw dummy load that can be attached to the output of a transmitter. It includes a calorimeter to calibrate the 60db coupler after the tx output stage.

Current Issues (may15)

Daily Measurements: (top)


General measurements/tests:  (top)



Measured rf levels  (top)

    We measured the 5.125 Mhz radiation levels using the narda monitor (get model #) while testing the hf transmitters.
These were single transmitter tests.

date
transmitter
transmitted power
location
measured level
150602
1
96KW
visitor center balconey
moved to find largest signal
50microWatts/cm^2
150602
6
100KW
edge of dish,inside ground screen
5 milliWatts/cm^2

Dummy load calibration measurements and curves (top)

    Linear fits were done to the calorimeter measurement vs rf coupler output (linear values).

Plots of calorimeter calibration results
transmitter
date,writeup
Notes
yintercept
tx1 (.ps)  (.pdf)
150512
Used Tout2 meter for fit
only 4 points. May want to redo after ac ripple.
This tx has gain of 200 rather than 20 (couplerOuput/sigGenInp)
-.23
tx2 (.ps)
(.pdf)
150811

-.84
tx3 (.ps) (.pdf)
150512_tx3, not finished
only got to 50Kw
-4.78
tx4 (.ps) (.pdf)
150512_tx4
150629_tx4
included both data in fits
1.95




tx6 (.ps) (.pdf)
150522
used Tout2 meter for fit
done
-3.35


 Output power (at 5.125 Mhz)  vs 60db rf coupler (using coupling constant) (.ps) (.pdf)


Dana's measurements (top)


Jim's documents (top)


Tx documentation (top)

txDoc links:
tx-schematics
tx manual
parts list
other site preparation
tetrode doc
ab5 tube performance computer



miscellaneous



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