Sine Systems RFC-1/B User Manual

RFC-1 Advanced Operation page 6.8
6.3.6 Indirect Power
The RFC-1 can calculate output power from plate voltage and plate current when a power sample is not available.
This is referred to as an indirect power calculation. This feature requires careful setup to work properly.
Sine Systems provides a web page that will perform the appropriate calculations and generate values to program into
the RFC-1. The web site is http://www.sinesystems.com. Navigate to the tech support section for the RFC-1 and
follow links to the Indirect Power Calculation page. Your web browser must have Javascript enabled to use the page.
No telemetry input is connected on an indirect power channel. Instead, the calculation is derived from the two
channels that precede it. Any channel from 02 up can be setup for indirect power. Connect the plate voltage two
channels lower than the indirect power channel. Connect the plate current one channel lower than the indirect power
channel. For example, connect the plate voltage to channel 00 and the plate current sample to channel 01 for an
indirect power reading on channel 02. Program and calibrate the plate voltage and plate current channels normally.
The indirect power settings use all four channel memory addresses. The normal use described in the Programming
Address Table does not apply. The values that are programmed into those addresses come from the computations
that follow, or that are generated by the web page. The computations are not difficult. The procedure takes a few
minutes to complete.
You must know the transmitter efficiency to program the RFC-1 to calculate the transmitter power output (TPO). For
effective radiated power (ERP) calculations, you must know the efficiency of the entire system--transmitter through
antenna. Due to antenna gain, this is not the same as the transmission line efficiency.
Complete the following steps in order. Write down the result from each instruction on the line to the left of the
instruction. Disregard digits to the right of the decimal after a calculation even if the result is a zero.
Line
Value
Instructions
1
Write down the efficiency as a whole number from 1 to 1023 (see notes above)
2
Divide line 1 by 256 and write the numbers to the left of the decimal
3
Multiple line 2 256 and write the result
4
Subtract line 3 from line 1 and write the result
5
Divide line 4 by 16 and write the numbers to the left of the decimal
6
Multiply line 5 by 16 and write the result
7
Subtract line 6 from line 4 and write the result
8
Multiply line 2 by 4 and write the result
9
Units: for “kilowatts” add 2 to line 8 or for “percent power” add 3 to line 8 and write the result
10
Decimal: use 0 for none, use 1 for 000.0, use 2 for 00.00, use 3 for 0.000
11
Multiply line 10 by 4 and write the result
12
Scale multiplier: use 0 for 1x, use 1 for 10x, use 2 for 100x
13
Add line 11 to line 12 and write the result
Locate the memory addresses for the channel that report the indirect power reading. Use the address table to find
the appropriate channel addresses. Ignore the descriptions in the table and program the values as shown below.
The critical values are in the four yellow shaded areas in the table above.
• Program the value on line 5 in the first memory address
• Program the value on line 7 in the second memory address
• Program the value on line 13 in the third memory address
• Program the value on line 9 in the fourth memory address
If the sequence was completed correctly, the RFC-1 will recognize that the values represent indirect power
parameters instead of the normal unit words and scales. It will take the appropriate readings and calculate indirect
power when this channel is selected.

Sine Systems RFC-1/B Specifications

General

Brand	Sine Systems
Model	RFC-1/B
Category	Remote Control
Language	English