FT1000MP  & MarkV Interfaces

 

 

 

 

 

PTT with Optocouplers

As described before keying the ptt line of the ft1000mp series is hard to pull down.
The usual optocouplers such as the 4nxx series or others can not pull the PTT line below 0.5 V.
I have used for years a 2n3904 transistor, others a 2n2222, to key the PTT line. But I wanted to isolate the pc completely from the transceiver and a mosfet optocoupler with low on-state resistance does the job.
I have used a TOSHIBA TLP227G with success, others has described the NEC PS7141-a.
With thanks to JA1EOD Aki for his knowledge. ON4ADZ

 

Simple PTT Circuit




 

This site was last updated 08/27/07