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Digital Sound Card Interfaceson the Cheap!
Dale Chidester NJ7C
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Basic Connections
• PTT• Audio In• Audio Out
Radio Computer
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PTT – RS232 Transistor
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PTT – RS232 Opto Isolator
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PTT USB to RS232
• Adapter Cable (Prolific)
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Audio Interface to Computer
• PC Internal Sound Card• Additional Internal Sound Card• USB Sound Card• Commercial Interface BUX Rascal,
SignaLink, etc.
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Internal Sound Card
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Hardware CostsBuilt-in Soundcard/RS232• 1/8” Stereo Phone Plug RS 274-284 (2) ~$4.00• 18’ Shielded Cable Home Depot #22 Security ~$2.50
– Audio Cable RS 42-2387 (6’) ~$10.00Audio Total ~$6.50
PTT Parts• DB9 Female RS 276-1537 $1.99• DB9 Shell RS 276-1549 $2.19• 2N222 RS 276-1617 (15) $2.99• 2.2K RS 271-007 (5) $0.99• 1N914 RS 267-1122 (10) $1.49
PTT Total: ~$10.00Total: ~$16.50
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Use USB Port for PTT
Built-in Soundcard RS232plus:• Prolific USB to Serial Adapter ~$15.00• Total ~$31.50
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Add-In Sound Card
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Add-In Sound Card
Add-In SoundCard RS232• PCI Sound Card PacificGeek, etc. on
Web ~$10.00• Audio and PTT (see above) ~$16.50• Total ~$26.50• Prolific USB to Serial Adapter ~$15.00• Total ~$41.50
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USB Sound Card
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USB Sound Card
USB SoundCard RS232• USB Sound Card SJ-588, PD552, etc.
~$ 5.00• Audio and PTT (see above) ~$16.50• Total: ~$21.50• Prolific USB to Serial Adapter ~$15.00• Total ~$36.50
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Audio Interface Dos and Don’ts -PC
• DO -Turn off all PC Operating System sound functions if using built in Sound Card.
• DO - Use Line input and output on PC SC.• DO – Always plug USB devices into the
SAME USB ports• DON’T - use too high a setting on the SC
input volume.
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Audio Cable
• Strip and Tin Leads
• Don’t forget to put the boot over the wire first!
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Audio Cable
• Solder Shield/Ground to Shell
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• Solder signal lead to Tip and Crimp
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Interface to Radio
• Old Way– External Speaker– Mic Input and PTT
• New Way– Audio/Line Out– Audio/Line In– PTT
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Audio Interface - Old Radio
Yaesu FT-7473 - External Spkr5 -AF Out
(Phone Patch)7 -PTT Jack
Mic Connector AF In
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Audio Interface – Not so old.
Yaesu FT-75717 – AF Out18 – Ext Spkr11 – PTT13 – Patch/AFSK
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Audio Interface - Newer Radios
Yaesu FT-100Data Jack
ICOM 718 - 706ACCessory Jack
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Audio Interface - Nicer Radio
ICOM IC-756 Pro
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Complete Circuit – IC-718/706
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Yaesu FT-100 Plug
Yaesu FT-100
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IC-718/706 Plug
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Audio Interface Dos and Don’ts- Radio
• DO - Use AF (Line, Phone Patch) out from radio, not External Speaker.
• DO - Use AF (Line, Phone Patch) Input to radio, not the Mic input.
• If you must use the Mic input on an older radio, DO - Insert at least 10:1 attenuation.
• DO - Adjust volume of PC SC output to radio so that ALC only moves a little when transmitting.
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Digital Sound Card Software• FLDIGI http://www.w1hkj.com/Fldigi.html• RMS Express (WINMOR)
http://www.winlink.org/WINMOR Click Downloads tab and Software-for_users to get latest revision. Need a WinLink (WL2K) email account.
• MULTIPSK http://f6cte.free.fr/index_anglais.htm• MixW http://mixw.net $50 to license.• IZ8BLY Hellschreiber, MT63, STREAM, etc.
http://xoomer.virgilio.it/aporcino/• MMTTY, MMSSTV, MMVARI
http://www.mmhamsoft.amateur-radio.ca• Digipan http://www.digipan.net• Hamscope http://www.qsl.net/hamscope
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fldigi
• Download and install• Set up Audio• Set up PTT• Calibrate sound card
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RMSExpress
• Register with Winlink.org• Download and install RMSExpress• Set up sound card• Set up PTT