[1] HiPass Filter Output (WHT/BLU): Connect to place the
Hi-Pass Filter in series with receiver audio path.
NOTE: The Hi-Pass Filter will not work in high level audio
stages such as speaker leads.
[4] Decode (-) (WHT/ORG): For applications where the radio
mute point must be held at Negative (-) Supply (Ground) during
mute Remove JU2 for applications requiring (-) Supply
(Ground) during decode.
[5] Decode (+) (BLK/ORG): For applications where the radio
mute point must be held Positive (+) during mute. Remove JU2
for applications requiring Positive (+) during decode.
[2] Hi-Pass Filter Mute (VIOLET): Connect to Decode (-)
(WHT/ORG) if none of the above mute conditions apply.
[1] Monitor (BROWN): PRIMARY CONTROL of
Encode/Decode functions. Connect to (-) Supply through
Monitor/hook switch to enable Decode and mute radio. Open
from (-) Supply to cause Encode and Monitor (Unmute radio).
_______
[8] Monitor (BLK/BRN): If your monitor switch closes to
Negative (-) Supply (Ground) to monitor, then MONITOR
(Brown) must be connected to Negative (-) Supply. Connect this
lead (BRN/BLK) to your Monitor hook switch.
____
[10] PTT (BLK/YEL): For applications with PTT closure to
Negative (-) Supply (Ground) during transmit Connect to PTT
in the radio. Required only if you must Encode without
Monitor.
[6] PTT (YELLOW): For applications where a keyed Positive
(+) is available during transmit. Required only if you must
Encode without Monitor.
OPERATING SPECIFICATIONS
Operating Voltage: 5.5Vdcto 16Vdc
Operating Current: Less than 5mAdc
Frequency Range: 67 to 250.3Hz, continuously tuneable
Temperature Range: 30
°
C to +60
°
C
Frequency Stability: Exceeds EIA RS-220A
(less than
±
1.5%, typically less
than
±
0.2%)
Encode Output Level: Adjustable 0 to greater than 1Vrms
with 8Vdc to 18Vdc supply
Encode Distortion: Less than 1%THD
Decoder Input Level: 10mVrms to 2Vrms (supply dependent)
Decoder lnput Z: Greater than 100K
Hi-Pass Filter: May be rnuted by decode
output
Decoder Activate: Field seledable (+) or (-) logic
Decoder Output: Open collector sink to (-) Supply or
source (+) voltage. Four possible out-
put conditions or Hi-Pass filter muting.
Interface: 18" flying leads terminated at
miniature
low profile connector.
Size: 1.68" L X 0.80" W X .25" H
4.27cm X 2.03cm X .64cm
***NOTICE***
If you are using a Selectone Application Note intended for the ST-104 please note
the following: If the YELLOW wire of the ST-104 is shown plugged into pin 3 of
the tone board use the BLACK/YELLOW wire on the ST-146 for this connection.
If the WHITE/ORANGE wire of the ST-104 is shown plugged into pin 5 use the
BLACK/ORANGE wire on the ST-146 for this connection. If the modification
instructions advise cutting R25 on the ST-104, ground the Brown wire on the ST-
146. R41 and R42 are equivalent to JU4 and JU5. All other application information
contained in Application Notes intended for the ST-104 is transferable to the ST-
146.
ST-104 ST-146
---------------------------------------------------------------
YELLOW (pin 3) = BLACK/YELLOW
WHITE/ORANGE (pin 5) = BLACK/ORANGE
Cut R25 = Ground BROWN
R41 = JU4
R42 = JU5
REVIEW BY:
DATE:
Engr: _____________________ Manual #: M501-2855
Revision: 960419-1
Mktg: _____________________ Last Edit
Date:4/18/96
Edited By: RTS
Prod: _____________________
3501 Breakwater Ave. Hayward, CA. 94545-3610
(510)
781-0376 (800) 227-0376
Fax: (510) 781-5454
E-MAIL [email protected]
WARRANTY POLICY
All standard Selectone products are guaranteed to meet or exceed published performance
specifications and are warranted against defects in material and workmanship for a period of five
years from the date of purchase. Special configurations and non-standard systems are warranted
for a period of one year.
If any standard Selectone product fails to operate within the first 90 days from the date of
purchase, Selectone will immediately send a replacement unit post-paid via airmail or UPS Blue
Label (air), and will issue full credit, including freight, upon the return of the defective unit(s).
For special warranty replacement service , call Selectone Customer Service Department TOLL
FREE at 1-800-227-0376. C.O.D. customers must return the defective equipment prior to
exchange or will receive the replacement C.O.D. with credit issued only on the return of the
defective equipment.
After 90 days, this warranty is specifically limited to correction of the defects by factory or
replacement of faulty equipment or parts.
All warranty repairs must be performed at the Selectone factory in Hayward, California. No credit
will be given for unauthorized repair work attempted by the customer. Any unauthorized
alterations or modification of the equipment , damage external source, or removal or alteration
the serial number label or date code, will void the warranty. Specifically exclude from this
warrant are batteries, LED’s, fuses, lamps, and damage caused by lightning, power surges, or
mechanical abuse.
Equipment for repair may be returned to the factory without prior written authorisation: however,
a note must be sent with the packing list briefly describing the nature of the defect.
