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Hardware Side of JT65- HF

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Page 1: Hardware Side of JT65-HF. Required Hardware: HF SSB Transceiver Computer 2-6 Customs Cables Digital Interface (may not be required)

Hardware Side of JT65-HF

Page 2: Hardware Side of JT65-HF. Required Hardware: HF SSB Transceiver Computer 2-6 Customs Cables Digital Interface (may not be required)

Required Hardware:• HF SSB Transceiver• Computer• 2-6 Customs Cables• Digital Interface (may not be required)

Page 3: Hardware Side of JT65-HF. Required Hardware: HF SSB Transceiver Computer 2-6 Customs Cables Digital Interface (may not be required)

HFTransceiver

Computer DigitalInterface

JT65 Hardware Interconnects

Page 4: Hardware Side of JT65-HF. 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

Page 5: Hardware Side of JT65-HF. Required Hardware: HF SSB Transceiver Computer 2-6 Customs Cables Digital Interface (may not be required)

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

Page 6: Hardware Side of JT65-HF. Required Hardware: HF SSB Transceiver Computer 2-6 Customs Cables Digital Interface (may not be required)

Digital Interface - Simplest

5 PTT Gnd

7 PTT2.2 K

9 Pin RS 232Connector

PTT Gnd

PTT

NPNtransistor

Diodes = any working diode

Page 7: Hardware Side of JT65-HF. Required Hardware: HF SSB Transceiver Computer 2-6 Customs Cables Digital Interface (may not be required)

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

Page 8: Hardware Side of JT65-HF. Required Hardware: HF SSB Transceiver Computer 2-6 Customs Cables Digital Interface (may not be required)

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

Page 9: Hardware Side of JT65-HF. Required Hardware: HF SSB Transceiver Computer 2-6 Customs Cables Digital Interface (may not be required)

HFTransceiver

Computer DigitalInterface

FM

“Mic”

“Headphones”

“USB” Port

F M

F MReceiver

AudioOut

FM

“Mic”F M

Digital Interconnects – Best

Page 10: Hardware Side of JT65-HF. Required Hardware: HF SSB Transceiver Computer 2-6 Customs Cables Digital Interface (may not be required)

Ground Loops

HFTransceiver

Computer

120 VACOutlet

V2 mVACV1 mVAC

“Mic”Mic

Page 11: Hardware Side of JT65-HF. Required Hardware: HF SSB Transceiver Computer 2-6 Customs Cables Digital Interface (may not be required)

Ground Loops

HFTransceiver

Computer

“Mic”Mic

V5 mVAC

V4 mVACV3 mVAC

120 VACOutlet

Page 12: Hardware Side of JT65-HF. Required Hardware: HF SSB Transceiver Computer 2-6 Customs Cables Digital Interface (may not be required)

Ground Loops

HFTransceiver

Computer

“Mic”Mic

V5 mVAC

V4 mVACV3 mVAC

120 VACOutlet

Note: All voltages are 60 Hz AC

Page 13: Hardware Side of JT65-HF. Required Hardware: HF SSB Transceiver Computer 2-6 Customs Cables Digital Interface (may not be required)

Ground Loops

HFTransceiver

Computer

“Mic”

Tone

V5 mVAC

V4 mVACV3 mVAC

120 VACOutlet

Page 14: Hardware Side of JT65-HF. Required Hardware: HF SSB Transceiver Computer 2-6 Customs Cables Digital Interface (may not be required)

Ground Loops

HFTransceiver

“Mic”

Tone

V5

V4 mVAC

120 VACOutlet

Page 15: Hardware Side of JT65-HF. Required Hardware: HF SSB Transceiver Computer 2-6 Customs Cables Digital Interface (may not be required)

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

Page 16: Hardware Side of JT65-HF. Required Hardware: HF SSB Transceiver Computer 2-6 Customs Cables Digital Interface (may not be required)

Ground Loops

HFTransceiver

Laptop

V2 mVAC

“Mic”

0 mVAC

Tone

120 VACOutlet

Page 17: Hardware Side of JT65-HF. Required Hardware: HF SSB Transceiver Computer 2-6 Customs Cables Digital Interface (may not be required)

Ground Loops

HFTransceiver

Computer

“Mic”

V5 = V2 – V1

Tone

X X

V2 mVACV1 mVAC

120 VACOutlet

Page 18: Hardware Side of JT65-HF. Required Hardware: HF SSB Transceiver Computer 2-6 Customs Cables Digital Interface (may not be required)

Ground Loops

HFTransceiver

Computer

“Mic”

Tone Isolator

V2 mVACV1 mVAC

120 VACOutlet

Page 19: Hardware Side of JT65-HF. Required Hardware: HF SSB Transceiver Computer 2-6 Customs Cables Digital Interface (may not be required)

Ground Loops

HFTransceiver

Computer

“Mic”

Tone Isolator

V2 mVACV1 mVAC

120 VACOutlet

Several types of isolators: • DC signals• Audio signals• RF signals

Page 20: Hardware Side of JT65-HF. Required Hardware: HF SSB Transceiver Computer 2-6 Customs Cables Digital Interface (may not be required)

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*

Page 21: Hardware Side of JT65-HF. Required Hardware: HF SSB Transceiver Computer 2-6 Customs Cables Digital Interface (may not be required)

Optocoupler

Optocoupler

1 5

42

Turn-On time <5 usecTurn-OFF time < 100 usec


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