Hardware side of jt65 hf
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Hardware Side of JT65-HF. Required Hardware: HF SSB Transceiver Computer 2-6 Customs Cables Digital Interface (may not be required). JT65 Hardware Interconnects. Digital Interface. HF Transceiver. Computer. JT65 Hardware Interconnects – Simplest. Only 2 signal paths involved. HF

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Hardware Side of JT65-HF

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Hardware side of jt65 hf

Hardware Side of JT65-HF


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

JT65 Hardware Interconnects

Digital

Interface

HF

Transceiver

Computer


Hardware side of jt65 hf

JT65 Hardware Interconnects– Simplest

Only 2 signal paths involved

HF

Transceiver

Computer

Speaker

“Mic”

“Headphones”

“Mic”

VOX

PTT

Digital Interface

(Not Required)


Hardware side of jt65 hf

JT65 Hardware Interconnects– Simple

Only 3 signal paths involved

HF

Transceiver

Computer

Speaker

“Mic”

“Headphones”

“Mic”

7 PTT

PTT

RTS

Digital Interface

Serial Port

PTT Gnd

GND

5 PTT Gnd

9 Pin RS 232

Connectors

Only required to generate PTT signal


Hardware side of jt65 hf

Digital Interface - Simplest

NPN

transistor

2.2 K

7 PTT

PTT

PTT Gnd

5 PTT Gnd

9 Pin RS 232

Connector

Diodes = any working diode


Hardware side of jt65 hf

  • 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


Hardware side of jt65 hf

Digital Interconnects Using A USB Port

HF

Transceiver

Computer

Speaker

“Mic”

M

“Headphones”

“Mic”

9 Pin RS 232

Connectors

PTT

Digital Interface

“USB” Port

PTT Gnd

F

  • USB 2.0 to RS232 Converter

  • Mfg: eforcity

  • Model: PCABUSBX0049

  • Driver Download: http://driverdownload168.com


Hardware side of jt65 hf

Digital Interconnects – Best

Digital

Interface

HF

Transceiver

Computer

Receiver

Audio

Out

“Mic”

F

M

M

M

F

M

F

M

“Headphones”

“Mic”

F

“USB” Port

F


Hardware side of jt65 hf

Ground Loops

HF

Transceiver

Computer

Mic

“Mic”

V1 mVAC

V2 mVAC

120 VAC

Outlet


Hardware side of jt65 hf

Ground Loops

HF

Transceiver

Computer

Mic

“Mic”

V5 mVAC

V3 mVAC

V4 mVAC

120 VAC

Outlet


Hardware side of jt65 hf

Ground Loops

Note: All voltages are 60 Hz AC

HF

Transceiver

Computer

Mic

“Mic”

V5 mVAC

V3 mVAC

V4 mVAC

120 VAC

Outlet


Hardware side of jt65 hf

Ground Loops

HF

Transceiver

Computer

“Mic”

Tone

V5 mVAC

V3 mVAC

V4 mVAC

120 VAC

Outlet


Hardware side of jt65 hf

Ground Loops

HF

Transceiver

“Mic”

Tone

V5

V4 mVAC

120 VAC

Outlet


Hardware side of jt65 hf

Ground Loops

HF

Transceiver

“Mic”

Tone

V5

  • 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

V4 mVAC

120 VAC

Outlet


Hardware side of jt65 hf

Ground Loops

HF

Transceiver

Laptop

“Mic”

Tone

0 mVAC

V2 mVAC

120 VAC

Outlet


Hardware side of jt65 hf

Ground Loops

HF

Transceiver

Computer

“Mic”

Tone

X X

V5 = V2 – V1

V1 mVAC

V2 mVAC

120 VAC

Outlet


Hardware side of jt65 hf

Ground Loops

HF

Transceiver

Computer

“Mic”

Isolator

Tone

V1 mVAC

V2 mVAC

120 VAC

Outlet


Hardware side of jt65 hf

Ground Loops

HF

Transceiver

Computer

“Mic”

Isolator

Tone

  • Several types of isolators:

    • DC signals

    • Audio signals

    • RF signals

V1 mVAC

V2 mVAC

120 VAC

Outlet


Hardware side of jt65 hf

Digital Interface

Isolation

Transformer

From

Receiver

Audio*

To

Computer

“Mic”

1 K*

M

M

+8 VDC

for Mic

Isolation

Transformer

10 K

100 uF

From

Computer

“Headphones”

+

MIC 1

RED

M

50

PTT 5

BLU

To Mic Input*

Ferrite

Choke*

F

MIC GND 7

WHT

PTT GND 6

SHLD

BRN

LED*

1 K*

Iso

PTT

1 K

7 PTT

From USB 2.0

to RS232

Converter

5

1

Optocoupler

4N33

F

2

4

5 PTT Gnd

  • 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

9 Pin

RS 232

Connector*


Hardware side of jt65 hf

Optocoupler

Optocoupler

5

1

2

4

Turn-On time <5 usec

Turn-OFF time < 100 usec


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