I can’t see how your circuit can work. Looking at the RS-232 side pin 2 (RWD). Where is the RS-232 side – 12 VDC source for logic One? Where is the RS-232 side + 12 VDC source for logic Zero?
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Look at the FIF-232 diagram. The power supply outputs +12 VDC and – 12 VDC. The actual RS-232 specification lists voltages between -5 and -15 for the negative and +5 and +15 for the positive.
But what is the differences between FIF-232 and mine? All these interfaces works with transistors in two regimens: cut and saturation, because the logic binary works with them.
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I use optos to separate the grounds and the transitors inside work in cut and saturations too.
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Look my interface:
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Thanks for reply.?
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Dr. José Carlos León Ortega
UDI- Universidad para el Desarrollo y la Innovación
Tel. (591 3) 3422525 Santa Cruz - Bolivia
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El sábado, 30 de mayo de 2020 10:12:30 a.?m. GMT-4, Dave Thompson <thompson@...> escribió:
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I used the FIF-232 years ago to get on PSK31.? Look at EBAY as there are sellers who are selling interface cables for the FT-980.? My FT-980's (I still have 2)
but I have an SDR transceiver that does not even need an interface for digital.? Good luck with your interface for the FT-980.
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73 Dave K4JRB.
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-----Original Message----- From: "jose carlos leon via groups.io" Sent: May 29, 2020 6:09 PM To: [email protected] Subject: [Yaesu-FT-980] CAT Interface
Hi, guys,
I am interesting in build an CAT Interface to my FT980.
