Specifications

3.3.6 Wiring Your HF Transceiver for Direct CW Keying
The PK-900 can directly key CW with HF and VHF multi-mode
transceivers. This requires that a cable be wired from the CW KEY OUT
jack on the PK-900's rear panel to the CW keying input of your
transceiver on the correct Radio Port. Refer to the instructions
below and Figure 3-3 to wire the PK-900 side of the cable.
Figure 3-3: Direct CW Keying Cable diagram
1. Locate a 5 pin DIN connector from the PK-900's accessory bag.
2. Consult your radio's instruction manual to determine if your
radio uses negative (Grid Block) or positive keying polarity.
Locate some shielded audio cable from Radio Shack or other cable
house and solder the DIN connector to the cable as shown above.
3. Locate the connector for the CW keying input to your transceiver.
These are often supplied in your transceiver's accessory kit.
4. Wire the transceiver connector as per the instructions in your
transceiver's manual for a "Straight key".
Connect the shielded cable you just wired from the PK-900's positive
or negative keying output to your radio's CW key input connector.
See the Specifications on page 1-4 for maximum limits.
3.3.7 Connections for Direct FSK Operation on RTTY
Some HF SSB radios provide direct FSK (Frequency-Shift Keying) for
RTTY operation. Direct FSK can be an advantage when using RTTY and
AMTOR and can sometimes help in HF packet operation. FSK operation
may be helpful if your transceiver can switch in filters. Be cautious
of narrow filters as they can limit your data rate. Direct FSK is not
always recommended for data speeds above 110 bauds. Consult your
transceiver's manual for further recommendations on direct FSK.
To install and operate your PK-900 and radio in the FSK mode:
1. Connect a shielded cable from the PK-900's FSK receptacle,
pins 1 or 4, to the radio's FSK input for radio port 1. Pins 3
or 5 are the FSK outputs for radio port 2.
NOTE: Polarity of the FSK signals is not standardized by the radio
manufacturers. We have observed that Icom radios most often
use FSKN (pins 3 and 4), while Kenwood radios most often use
FSKR (pins 1 and 5). Consult your transceiver's manual to
identify the proper polarity.
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