W4FT on Amateur Radio

Do you have an MFJ-434 attached to your Yaesu FT-1000MP, but your microphone doesn’t work well or the radio starts retuning downward when you engage the EDSP?  Then it’s time to check those 434 jumper settings!

For years, I’ve had an MFJ-434 voice keyer that I wanted to use with my Yaesu FT-1000MP during contests.  Sometimes, it would work fine.  Other times, the combination of the radio and the keyer would do strange things. Often, I would just disconnect the keyer and set it aside – I wasn’t in the mood to troubleshoot during a contest.  Afterwards, once I recovered, I wasn’t really in the mood to troubleshoot the problem.  I spent a lot of time searching the internet for a solution, but never found anything that worked.  In fact, I didn’t find much on the topic at all. Anyways, with Field Day approaching, combined with the relay problem that I had (see http://w4ft.com/2010/06/yaesu-ft-1000mp-transmit-relay-replacement/ )  I decided to spend some time really digging into this one.  The good news:  I found a solution – the correct jumper settings for the MFJ-434 to work with the FT-1000MP! Read more…