I never had good luck with optoisolators on my Yaesu gear. I swapped
then out for 2N2222 or equiv. transistors. Simple circuit - 1Kohm
resistor on base, emitter grounded, output from collector.
Barry W2UP
On 8 Jul 2004 at 8:38, Doug Faunt N6TQS +1-510-655-8 wrote:
> From: dl6jz@t-online.de
> Date: Thu, 08 Jul 2004 09:46:59 +0200 (CEST)
>
> Does the interface has an optocoupler for the PTT-Line. Then it
> will not work for FT-1000MP and may be for the FT-990 also.
>
> I made some experiments with my FT-1000MP with the result that the
> voltage over the closed PTT-switch must be lower than 0.5 Volt, so
> that the tcvr goes to transmit. And normal optocouplers has a
> voltage of 0.7 Volt and more.
>
> These are my thoughts also. I've had good luck with what are sold as
> "solid-state relays'" in the Mouser catalog, which are essentially
> optocouplers with an FET output. They have really low "on"
> resistance, and pull the keyed line very low.
>
> 73, doug
>
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--
Barry Kutner, W2UP Internet: w2up@mindspring.com
Newtown, PA Frankford Radio Club
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