Squad Radio TS-3354/PRC-68

© Brooke Clarke


TS-3354/PRC-68 
This is a test set designed to do a quick check of the Rx and Tx functions of the PRC-68 radio and also includes a Field Strength Meter used for adjusting the antenna coupling on the RPC-68.  It also will work on the PRC-126 since it's the same frequency range and has about the same specifications (need to check).
The battery test, receiver sensitivity and transmit output functions all seem to work OK with the PRC-126.

On the right the connector where the radio is to be installed has two pins sticking up.  In order to get the PRC-68 radio to seat the module housing needs to be removed, which is a good idea since adjestments will be made.  When using a PRC-126 with the TS-3354 just use the battery on the PRC-126 and do not connect it to the TS-3354 for power, just use the BNC ANT cable and the Audio Cable.  The main reason for the pins is to prevent a bettery from being connected to these terminals and frying the inside of the test set.

The Frequency Code switches are set for 51.0 MHz.

The Following accessories should be under the lid:

TS-3354/PRC-68 TM 11-6625-2946-14  (046833.pdf)  NSN 6625-01-091-3157 - Operators, Org, Dir Sup & Maint
TS-3354/PRC-68 TM 11-6625-2946-24P (050359.pdf) Org, Dir and Gen Support Maint Rep Parts & Sp Tools for TS-3354

The 046833.pdf manual has schematic diagrams for the synthizer 914265-801 that similar to the one used in the PRC-68 but has a ribbon cable going to the front panel instead of the small switches that are on the module for the PRC-68, there is a bracket soldered to the module to hold the ribbon cable.   It also has the schematic diagram for the 1A7 VCO module 917833-803.  The VCO module is right from the PRC-68.

Pin D of the power connector is for +24 VDC and pin A is ground, no other pins are used.

Only pin B (ear) and pin A (ground) are used on the AUDIO connector.

There is also a Cinox T154 12.000 MHz oscillator that appears to be a high quality oven unit.

 Operation

Settings for the Channel Switches

The Channel switches A, B,C and D control the internal 1A9 Synthesizer modlule that has these switches located on the front panel rather than be on the module itself.  (this table was printed on the battery cover for the PRC-68) The programming table looks like:
Freq Code
A
B
C
D
0
-
0.00
.00
.00
1
30.00
2.00
.20
.05
2
40.00
4.00
.40
.10
3
54.00
6.00
.60
.15
4
64.00
8.00
.80
-
5
-
10.00
1.00
-
6
-
12.00
1.20
-
7
-
14.00
1.40
-
8
-
-
1.60
-
9
-
-
1.80
-
So to set the TS-3354 on 51.0 MHz the switches need to be set:
A=2, B=5, C=5, D=0.

RCV Function


TS-3354 Lid Instructions
OAI Electronics - (CAGE 22887) web page under construction, nothing there yet

CAGE 37695
RAYTHEON CO
DBA RAYTHEON SYSTEMS CO
1010 PRODUCTION RD
FORT WAYNE, IN 46808-4106
Litton - Tactical Communication Interface Modems -

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page created 2000.