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USER'S GUIDE
14. Set the PK-232's front-panel THRESHOLD control at approximately the two-o'clock
position.
15. With your radio in receive mode, tune the receiver to a clear, unoccupied frequency.
16. Set the receiver's volume control so the DCD LED on your PK-232 is just lit by the
output noise signals from your receiver.
This is the approximate receiver audio output level for best receive performance from
your PK-232's modem.
2.7.2.1
Connections for Direct FSK Operation on RTTY
Some HF SSB radios provide direct FSK (Frequency-Shift Keying) for RTTY operation.
FSK operation sometimes offer advantages, especially with radios that automatically ac-
quire a CW or narrow-band IF filter. This can sometimes provide better results at lower
Baudot and ASCII RTTY speeds, although very narrow filters can limit your data rate.
Direct FSK is not always recommended for Mode A (ARQ) AMTOR or data speeds in ex-
cess of 110 bauds (100 WPM in either Baudot or ASCII).
To install and operate your PK-232 and radio in the FSK mode:
1. Connect a shielded cable from the PK-232's J7 (DIN) receptacle, pin 1 or 4, to the ra-
dio's FSK input.
NOTE: Polarity of the FSK signals, which are DC rather than audio, is not standar-
2. Connect the FSK lines from the PK-232 to your radio's FSK input in accordance with
your radio's specific requirements.
See Figure 2-3 below.
NOTE: When using FSK for Baudot and ASCII RTTY and AMTOR FEC (Mode B), the
2.7.3
CW Installation and Adjustment
Your PK-232 permits CW operation in either of two ways:
o
Direct DC keying of your radio's CW KEY circuits.
o
Simulated CW keying using AFSK in upper or lower sideband.
PK232UG Rev. B 9/86
dized by the radio manufacturers. Consult the manufacturer's instruction
manual for your radio to identify correct FSK polarity.
Figure 2-3
same power and duty-cycle restrictions apply as cited earlier for AFSK opera-
tion. Some radios provide lower output power when in FSK mode. Consult
your radio's operating manual.
Connector J7 Pinout
2-17
INSTALLATION
35
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