[1000mp] RTTY and the FT1000MP

[Tom Homewood]

The Opto likely doesn't have enough current sinking capacity.

I had to go to a transistor to switch the PTT Line.

The 2N2222 should work fine.

73, Tom, W1TO


----- Original Message ----- 
From: "Ted Boerkamp" <tboerkamp at cogeco.ca>
To: "1000mp Reflector" <1000mp at mailman.qth.net>
Sent: Saturday, March 18, 2006 2:51 PM
Subject: [1000mp] RTTY and the FT1000MP


> Hello Everyone,
> Just wondered if anyone has experienced the same
> frustration as myself in trying to get a soundblaster interface for
> rtty working....specifically the PTT circuit.
> I have used the opto-coupler circuits shown on a few websites for
> this purpose and I am tying into the RTTY jack on the back of the
> 1000MP (original model). When I click on TX in MMTTY, a LED lights
> on the input side of the opto IC, but the 1000MP is not keyed.
> So I know that the signal is getting to the opto-coupler but the
> output doesn't seem to be right to key up the radio.
> I have tried two different versions of opto ICs, one even having a
> darlington output to no avail. Can someone confirm for me that the
> simple resistor/transistor(2n2222) circuit shown on a number of
> websites, will work for this radio??? or does someone have a better
> idea for the PTT circuit?? Any help is greatly appreciated.
> I was hoping to get my feet wet in rtty this weekend in the contest,
> but I guess it will have to wait.
> Thanks and 73
> 
> Ted Boerkamp VE3SS
> 
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