Bird Technologies 3170A Series - Manual (Page 20)

Active Forward
Monitor Setup
In ter nal cir cuitry sets Ac tive For ward Mon i tor (AFM) in put to a high state. This in hib its mon i tor -
ing of for ward power on trans mis sion line. To mon i tor for ward power, fol low the steps be low.
1. Con nect AFM in put to ground by hardwiring ter mi nal strip po si tion
10 (AFM in put) to po si tion 7 (ground).
2. Se lect the ap pro pri ate de lay (see ta ble 3-1). This de lay al lows trans -
mit ting equip ment to reach ac cept able power out put be fore be ing
mon i tored by for ward chan nel for low power con di tion.
There are two ways to de ter mine the re quired de lay:
a. If the de lay in the user’s equip ment is known, the AFM should be
set to the same de lay plus a min i mum of 25 per cent safety fac tor.
b. The sec ond al ter na tive is to set the AFM to pro gres sively shorter
de lays un til switch ing on the car rier causes the FWD mon i tor to trip
when the user’s equip ment is known to be work ing prop erly. Then
add a 25 per cent safety fac tor to the de lay in di cated by the switch
set ting and set the de lay to that set ting.
+
NOTE: that the dis abling of the for ward mon i tor is vir tu ally in stan ta neous when the AFM sig -
nal is re moved and is un af fected by the switch set tings.
Dip Switch Settings Dip Switch bank S02 is used to se lect AFM de lay time. Re fer to fig ure 3-3 for cor rect on / off po -
si tion. Be sure the switches or set fully on or off.
In ta ble 3-1 the de lay times are listed in the ap pro pri ate row & col umn for the switch set tings.
+
NOTE: The de lay times are dif fer ent for the model 3170A300.
Bird Se ries 3170A High-Speed Wattcher
RF Mon i toring Sys tem
3-4
SW6 ON
SW5 OFF
SW4 OFF
SW6 OFF
SW5 ON
SW4 OFF
SW6 OFF
SW5 OFF
SW4 ON
SW1 SW2 SW3
3170A300
All Other
Models
3170A300 All Other Models 3170A300 All Other Models
ON ON ON 7.1ms 71 µ s 71ms 710 µ s 710m
s
7.1s
OFF ON ON 8.3ms 83 µ s 83ms 830 µ s 830m
s
8.3s
ON OFF ON 10.0ms 100 µ s 100m
s
1ms 1s 10.0s
OFF OFF ON 12.1ms 121 µ s 121m
s
1.21ms 1.21s 12.1s
Table 3-1
Set ting AFM De lay
Figure 3-3
S02 Dip Switch