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Required Hardware:• HF SSB Transceiver• Computer• 2-6 Customs Cables• Digital Interface (may not be required)
HFTransceiver
Computer
“Mic”
“Headphones”
Speaker
“Mic”
JT65 Hardware Interconnects – Simplest
Digital Interface(Not Required)
VOX
PTT
Only 2 signal paths involved
HFTransceiver
Computer
“Mic”
“Headphones”
Serial Port
Speaker
“Mic”
JT65 Hardware Interconnects – Simple
5 PTT Gnd
7 PTT
Digital InterfacePTT Gnd
PTT
9 Pin RS 232Connectors
Only 3 signal paths involved
Only required to generate PTT signal
RTS
GND
Digital Interface - Simplest
5 PTT Gnd
7 PTT2.2 K
9 Pin RS 232Connector
PTT Gnd
PTT
NPNtransistor
Diodes = any working diode
POTENTIAL PROBLEMS:• Some computers do not have a “MIC” input• Tones generated by computer may not have equal amplitude
• May be hard to identify this problem• May not be a common problem
• No RS 232 serial port• Difficult to set MIC level to transmitter
• Typical computer audio out is ~2V• Typical “MIC” input level is ~10mV
• Difficult to set MIC level to computer• Don’t use JT65 software to adjust receiver audio level
• Ground loops
HFTransceiver
Computer
“Mic”
“Headphones”
Speaker
“Mic”
Digital Interface
USB 2.0 to RS232 Converter•Mfg: eforcity•Model: PCABUSBX0049•Driver Download: http://driverdownload168.com
9 Pin RS 232Connectors
FM“USB” Port
Digital Interconnects Using A USB Port
PTT Gnd
PTT
HFTransceiver
Computer DigitalInterface
FM
“Mic”
“Headphones”
“USB” Port
F M
F MReceiver
AudioOut
FM
“Mic”F M
Digital Interconnects – Best
Ground Loops
HFTransceiver
Computer
“Mic”Mic
V5 mVAC
V4 mVACV3 mVAC
120 VACOutlet
Note: All voltages are 60 Hz AC
Ground Loops
HFTransceiver
“Mic”
Tone
V5
V4 mVAC
120 VACOutlet
Note: • V5 will cause 60 Hz hum on transmit signal• V5 can also cause broadband noise on transmit signal• Typical microphone output level ~10 mV
Ground Loops
HFTransceiver
Computer
“Mic”
Tone Isolator
V2 mVACV1 mVAC
120 VACOutlet
Several types of isolators: • DC signals• Audio signals• RF signals
9 PinRS 232
Connector*
5 PTT Gnd
F
7 PTT
+8 VDCfor Mic
100 uF
1 K
•Transformers are Mouser P/N 546-149T• 600W CT/600W CT• 200 Hz to 15 KHz• 1 watt
*: Not included in some (ie, SCI-6) designs
To Mic Input*
Digital Interface
IsoPTT
+10 K
50
Optocoupler4N33
FromReceiverAudio*
IsolationTransformer
IsolationTransformer
FromComputer
“Headphones”M
MTo
Computer“Mic”
From USB 2.0to RS232
Converter
1 5
42
FPTT 5
PTT GND 6
MIC GND 7
MIC 1
M
FerriteChoke*
1 K* LED*
SHLDBRN
WHT
BLU
RED
1 K*