Heating Facility Transmitter

last update:23jun17
Sections:
Terminology:

Intro: (top)

    We have a T1524/fps118V  V1 transmitter. It was part of the over the horizon radar system at moscow main.
(The xmiter part number faceplate is PN52151assy126101-1 ( -2 would be version 2. see page 854 1-10 table 1.3 of manual).   
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.


General Information



Daily Measurements: (top)

2015 daily tests

2016 daily tests

2017 daily tests


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 balcony
moved to find largest signal
50microWatts/cm^2
150602
6
100KW
edge of dish,inside ground screen
5 milliWatts/cm^2
151013
4
100KW
vip observation pnt at rim
16. milliWatts/cm^2

Table of maximum permissible exposure (mpe)

    from:Evaluating Compliance with FCC guidelines for human exposure to RadioFrequency
Electromagnetic files (OET bulletin 65 edition 97-1 (aug 1997)

Limits for General Population/Uncontrolled Exposure
freq Range
MHz
E Field Str
(V/m)
H Field Str
(A/m)
PwrDen (S)
(mW/cm^2)
(S)
averaging
Time
 (minutes)
.3 - 1.34
614
1.63
(100)*
30
1.34 - 30
824/f
2.19/f
(180/f^2)*
30
30-300
27.5
.073
.2
30
300-1500
-

f/1500
30
1500-100,000
-

1.0
30
at 5.125Mhz
161
.43
6.85
30
at 430Mhz


.29

at 2380 Mhz


1.0


Limits for Occupational/Controlled Exposure
freq Range
MHz
E Field Str
(V/m)
H Field Str
(A/m)
PwrDen (S)
(mW/cm^2)
(S)
averaging
Time
 (minutes)
.3 - 3.0
614
1.63
(100)*
6
3. - 30.
1842/f
4.89/f
(900/f^2)*
6
30 - 300
61.4
.163
1.0
6
300-1500
-
-
f/300
6
1500-100,000
-
-
5
6
at 5.125 Mhz
359
.95
34.3
6
at 430Mhz

1.43

at 2380 Mhz

5

Notes:



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)


miscellaneous



Equipment

Phase shifter

Signal generators:



<- page up

home_~phil