[WriteLog] Help with FT-990 & WL setup

Thu Jul 8 08:38:17 EDT 2004

 From: dl6jz at t-online.de
 Date: 2004年7月08日 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