KPC-9612 Version 5.2 July 19, 1994
13
KPC-9612 to 9600 baud Radio Cable
The final step in connecting your KPC-9612 is to make the cable from the KPC-9612 to your 9600
baud radio.
NOTE that 9600 baud operation requires a radio that is specifically designed or modi-
fied for 9600 baud operation. Not all radios are capable of being modified for 9600 baud
.
Connections to a radio for 9600 baud operation are made through the
DB-15 connector on the rear panel. In order to transmit and receive
9600 baud packet, you must connect the following pins to your radio:
Pin 1 (PTT) Push-to-Talk – This pin connects to the PTT pin of your radio. The PTT signal causes
the radio to transmit when the TNC has data to send. This pin on your radio may have a
different name (e.g. STBY), but the function as described in your radio manual should indi-
cate that a ground on this pin will cause the radio to transmit.
Pin 2 (RXA) Receive Data – This pin connects to the 9600 baud data output pin of your radio.
Pin 3 (TXA) Transmit Data – This pin connects to the modulator stage of the radio. Those radios
that are "9600-ready" will identify this pin as the 9600 baud input from your TNC.
Pin 11Ground – This pin connects to the ground of your radio. (
NOTE: Pin 9 and 10 are also
ground on the KPC-9612.
)
Adjusting Transmit Drive Level
The drive level of the 9600 baud modem in the KPC-9612 is adjusted using R32 and jumper J7.
When J7 is placed on both posts, R32 will adjust the drive through the high range (80 mV to 4 Vp-
p), This will be the normal setting for most radios. If you're using a Kantronics D4-10 or DVR2-2
radio, J7 will need to be placed on one post only, selecting the low range (2 mV to 100 mVp-p).
Typically, the proper deviation for 9600 baud operation is about 3 kHz. If you don't have a devia-
tion meter, you may have a difficult time in adjusting the level properly. However, start by setting
the drive level as recommended for your brand of radio (see your radio manual). You may then
have to adjust the drive control (R32) until you achieve acceptable performance.
If you have an existing 9600 baud node or other
station operating in your area, we suggest you
attempt to digipeat through that station (see the
UNPROTO command) while making this adjust-
ment.
Adjusting 9600 baud Receive
As shipped from the factory, the KPC-9612 is set
for proper reception with many of the 9600-baud
ready radios on the market. (J8 is on the center
post and post 1.) Should you find that your KPC-
9612 is not receiving well, or if you want to fine-
tune your KPC-9612 for your specific radio, you
will need to place the jumper J8 on the center
post and the post marked 2. This enables R33 for
variable equalization. (See the diagramm at the
right for component location.)
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