[OZAPRS] MFJ1270 won't key up FT8100, but ok with FT897?

Damien Gardner Jnr vk2tdg at gmail.com
Sun Jan 23 20:46:26 EST 2011


Hey Folks,

This has been driving me nuts for aaages - I thought my trusty old 1270 had died, because despite pulling the PTT line low, it wasn't keying up my FT8100.. So I kept an eye out on ebay, and finally managed to snag a 1278.  That's been sitting around for a while now..  I finally plugged it in, and what do you know? That won't key up the 8100 either!   Pulling the 5-pin DIN out of the back of the MFJ, and shorting the PTT pin to ground with a pair of pliers, keys up the radio, so I know the radio *will* key up..  A small brainwave had me unplugging the cable to the laptop, from my FT897, and plugging in the cable from the MFJ.. and what do you know? It keys it up fine!  

So now I'm totally stumped!  I don't suppose anyone has come across anything like this?  Are the MFJ's for some reason not pulling the PTT 'low enough' for the 8100?  Has the 8100 gotten a little old, and is wanting 'more' of a low than the MFJ's will put out?  Or have I inadvertently bumped something at some stage on the 8100, and there's a setting I don't know about, relating to the PTT on the data port?

Any thoughts muchly appreciated, this is driving me nutso!

Cheers,

DG


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