## Frequency (FR)

Purpose: To specify the frequency(s) in megahertz

Card:

```     _________________________________________________________________
/2|  5|   10|   15|   20|    30|    40|    50|    60|    70|    80|
/  |   |     |     |     |      |      |      |      |      |      |
|   |   |     |     |     |      |      |      |      |      |      |
|FR |I1 | I2  | I3  | I4  |  F1  |  F2  |  F3  |  F4  |  F5  |  F6  |
|   |   |     |     |     |      |      |      |      |      |      |
|   | I |  N  |  B  |  B  | FMHZ |DELFRQ|BLANK |BLANK |BLANK |BLANK |
|   | F |  F  |  L  |  L  |      |      |      |      |      |      |
|   | R |  R  |  A  |  A  |      |      |      |      |      |      |
|   | Q |  Q  |  N  |  N  |      |      |      |      |      |      |
|   |   |     |  K  |  K  |      |      |      |      |      |      |
|   |   |     |     |     |      |      |      |      |      |      |
|  The numbers along the top refer to the last column in each field |
|   |   |     |     |     |      |      |      |      |      |      |
```
Parameters:
Integers
IFRQ (I1) - Determlnes the type of frequency stepping which is
O - linear stepping.
1 - multiplicative stepping.
NFRQ (12) - Sumber of frequency steps. If this field is blank, one is assumed.
(I3) & (I4) - Blank.
Floating Point
FMHZ (F1) - Frequency in megahertz.
DELFRQ (F2) - frequency stepping increment. If the frequency stepping is linear, this quantity is ailed to the frequency each tlme. If the stepping is multiplicatlve, this is the multiplication factor.
(F3) -> (F6) - Blank.
Notes:
• If a frequency card toes not appear in the data deck, a single frequency of 299.8 MHz is assumed. Since the wavelength at 299.8 MHz 1s one meter, the geometry Is in units of wavelengths for this case.

• Frequency cards may not be grouped together. If they are, only the information on the last card in the group will be used.

• After an FR cart with NFRQ greater than 1, an NE or SH card will not initiate execution while an RP or XQ card wlll. In this case, only one NE or WH cart and one RP card will bc effective for the multiple frequencies.

• After a frequency loop for NFRQ greater than one has been completed, it will not be repeated for a second execution request. The FR card must be repeated in this case.