PK232.21
From: W5IFP@W5IFP
AS A RESULT OF THE BULLETIN I SENT ON USING 2 TNC'S ON ONE RTU,
SEVERAL HAVE REQUESTED THE SPECIFIC DATA ON THE PK-232 TNC.
THERE ARE SEVERAL WAYS TO MODIFY THE PK-232 TO ACCOMPLISH THE DATA
INVERSION ON THE SQUELCH OR REC. DATA LINE (RF-DCD). I HAVE A HEATHKIT
HK-232 SO I'LL USE THAT FOR EXPLANATION…HOPEFULLY THE CKT DESIGNATIONS
ARE THE SAME AS THE AEA PK-232. THE FOLLOWING IS A CROSS REF TO PIN #'S:
DATA MFJ-1270 RTU HK-232
—- —— —— ——
GND PIN 2 ————- PIN 2 ———— PIN 4
TX AUDIO PIN 1 ————- PIN 1 ———— PIN 2
RX AUDIO PIN 4 ————- PIN 4 ———— PIN 1
PTT PIN 3 ————- PIN 3 ———— PIN 5
RF-DCD (SQU) PIN 5 —->——- PIN 3 ——- 1N914 1N914
* THE SQUELCH LINE MUST HAVE THE LOGIC SIGNAL INVERTED TO WORK . THIS CAN
BE DONE INTERNALLY BY CHANGING Q6 FROM A NPN TO A PNP TRANSISTOR. GARDEN
VARIETY WORKED OK (2N3906 OR 2N2905 OR EQ.)
CONTINUED IN FILE PK232.22
GW1NGL NA7KR Kevin Roberts Ham Radio
Page last updated on 09/10/2012 by Kevin Roberts NA7KR a colection of Ham Radio and Electronic Information
From: W5IFP@W5IFP
AS A RESULT OF THE BULLETIN I SENT ON USING 2 TNC'S ON ONE RTU,
SEVERAL HAVE REQUESTED THE SPECIFIC DATA ON THE PK-232 TNC.
THERE ARE SEVERAL WAYS TO MODIFY THE PK-232 TO ACCOMPLISH THE DATA
INVERSION ON THE SQUELCH OR REC. DATA LINE (RF-DCD). I HAVE A HEATHKIT
HK-232 SO I'LL USE THAT FOR EXPLANATION…HOPEFULLY THE CKT DESIGNATIONS
ARE THE SAME AS THE AEA PK-232. THE FOLLOWING IS A CROSS REF TO PIN #'S:
DATA MFJ-1270 RTU HK-232
—- —— —— ——
GND PIN 2 ————- PIN 2 ———— PIN 4
TX AUDIO PIN 1 ————- PIN 1 ———— PIN 2
RX AUDIO PIN 4 ————- PIN 4 ———— PIN 1
PTT PIN 3 ————- PIN 3 ———— PIN 5
RF-DCD (SQU) PIN 5 —->——- PIN 3 ——- 1N914 1N914
* THE SQUELCH LINE MUST HAVE THE LOGIC SIGNAL INVERTED TO WORK . THIS CAN
BE DONE INTERNALLY BY CHANGING Q6 FROM A NPN TO A PNP TRANSISTOR. GARDEN
VARIETY WORKED OK (2N3906 OR 2N2905 OR EQ.)
CONTINUED IN FILE PK232.22
GW1NGL NA7KR Kevin Roberts Ham Radio
Page last updated on 09/10/2012 by Kevin Roberts NA7KR a colection of Ham Radio and Electronic Information