[1000mp] Computer Interface

[Akira Iizuka]

I am using optocoupler( Photo Relay) for PTT and FSK.
These are good result for FT-1000MP MK-V.
73

Tom Homewood wrote:

> If you are using an Optocoupler you will need one with higher current
> transfer ratio for PTT. I measured over 10ma. of current that needed to be
> sinked when I checked my MP.
>
> Consider replacing it with a transistor. Not too long ago someone identified
> a better Opto but I don't remember the part number, You might find it in the
> archives.
>
> 73, Tom, W1TO
>
> ----- Original Message -----
> From: "Doug Rehman" <k4ddr at earthlink.net>
> To: "'All about Yaesu 1000mp'" <1000mp at mailman.qth.net>
> Sent: Monday, August 29, 2005 1:45 AM
> Subject: [1000mp] Computer Interface
>
> >I just finished building an interface for my Field for both CW and digital
> > modes. I used the circuit found at http://www.qsl.net/wm2u/interface.html
> > for both the CW key and the PTT. The CW key works perfectly from the
> > computer, but I am having a problem with the PTT line. The PTT line is
> > connected to Pin 3 of the "Packet" connector.
> >
> > When keyed by the computer, the PTT voltage drops from 13.4 volts to about
> > 2.7 volts- not enough to key the radio. If I parallel 50 ohms across the
> > opto isolator's output, it works like it is supposed to (the standby
> > voltage
> > on the PTT line drops to about .7 volts, but the radio isn't keyed until
> > the
> > computer keys it).
> >
> > I've tried to use the CW key output for PTT, but it does the same thing so
> > I
> > don't think it's a wiring or component issue.
> >
> > I've also checked the ground connection- no problem (.1mV difference
> > according to my DVM).
> >
> > It won't key the radio from the  PTT connector on the back either.
> >
> > I've used this exact same circuit before on a Kenwood TS-430S and TS-2000
> > without any problems.
> >
> > Any ideas? Anybody experienced this before?
> >
> > Hanks,
> > Doug
> > K4DDR
> >
> >
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>
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