[1000mp] RTTY and the FT1000MP

[Vermilyea, John]

You could go really "belt and spenders" and still use the opto-isolator
switching a low curent relay. Since it for the PTT circuit it's not
likely you wear it out soon (most have lifetimes of 100K cycles or
more). That way you still have isolation from the computer.The only real
down side is that now you will need a small power supply to power the
relay and output transistor. But you could get away with a small "wall
wart". Just something to think about.

73, John K3YS

-----Original Message-----
From: 1000mp-bounces at mailman.qth.net
[mailto:1000mp-bounces at mailman.qth.net] On Behalf of Tom Homewood
Sent: Saturday, March 18, 2006 3:37 PM
To: All about Yeas 1000mp
Subject: Re: [1000mp] RTTY and the FT1000MP

The Opt 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 Boer amp" <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 opt-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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