Installation Instructions

Hardware Installation
RVP8 User’s Manual
September 2005
2–34
2.4.2 Example Hookup to a MITEQ “MFS-xxx” STALO
The electrical interface for this STALO uses a 25-pin “D” connector with the following pin
assignments
S GROUND on pins 1 and 2.
S Four BCD digits of 1KHz, 10KHz, 100KHz, and 1MHz frequency steps, using Pins
<25:22>, <21:18>, <17:14>, <13:10>.
S Seven binary bits of representing 10MHz steps, Bits<0:6> on Pins<9:3>.
First configure the IFD pins themselves. Pins 1 and 2 are ground, and are connected with
wirewrap wire to the nearby ground posts. Pins 3 through 25 all are signal pins, so we plug in a
jumper for each of these 23 pins. We will use pinmap uplink protocol, so H3 and H4 are
removed; and a x1 on-board crystal, so H2 is also removed.
In this example we will assume that we wish to control the STALO in 20KHz steps from
1.350GHz to 1.365GHz. This can be done with the following setups from the Mb section:
AFC span– [–100%,+100%] maps into [ 1350000 , 1365000 ]
AFC format– 0:Bin, 1:BCD, 2:8B4D: 2, ActLow: NO
AFC uplink protocol– 0:Off, 1:Normal, 2:PinMap : 2
PinMap Table (Type ’31’ for GND, ’30’ for +5)
–––––––––––––––––––––––––––––––––––––––––––––
Pin01:GND Pin02:GND Pin03:22 Pin04:21 Pin05:20
Pin06:19 Pin07:18 Pin08:17 Pin09:16 Pin10:15
Pin11:14 Pin12:13 Pin13:12 Pin14:11 Pin15:10
Pin16:09 Pin17:08 Pin18:07 Pin19:06 Pin20:05
Pin21:GND Pin22:GND Pin23:GND Pin24:GND Pin25:GND
FAULT status pin (0:None): 0, ActLow: NO
We map the AFC interval into a numeric span from 1350000 to 1365000, and choose the
“8B4D” mixed-radix encoding format. The STALO itself has 1KHz frequency steps, but the
AFC servo will be easier to tune if we intentionally degrade this to 20KHz. This is done simply
by grounding all four of the 1KHz BCD input lines, plus the LSB of the 10KHz BCD digit. A
more creative use for one of these unused pins would be to remove the pin 25 jumper, wirewrap
pin 25 to ground (so the STALO sill reads it a logic low), and assign pin 25 as a fault status
input. That pin could then be connected to an external fault line, if the STALO has one.