[1000mp] RTTY and the FT1000MP

[Jim Hill]

I suffered the same frustration in trying to get my Mark V to key using 
my interface for PSK-31.  I finally threw in the towel and used the PTT 
phono jack.  I just made a separate connector.  Works fine.  The manual 
says the open circuit voltage is +13.5v and closed circuit current is 
1.5ma,
73, Jim

On Mar 18, 2006, at 2:11 PM, Joe Subich, W4TV wrote:

>
> Ted,
>
> The FT-1000 family of radios (D/MP/Mark V/Field) have a diode in
> series with most of the PTT lines on the back panel.  They take an
> exceptionally "had" pull to ground to accommodate the drop in the
> diode.
>
> The best thing to do is to add a 2N2222 or similar to the output
> of the Opto-isolator (emitter to ground, base to the output of the
> Opto, collector to the FT-1000).  That increases the current gain
> and will often fix the problem.
>
> The other solution is to use an opto with a high gain darlington
> output.
>
> 73,
>
>     ... Joe, W4TV
>
>
>> -----Original Message-----
>> From: 1000mp-bounces at mailman.qth.net
>> [mailto:1000mp-bounces at mailman.qth.net] On Behalf Of Ted Boerkamp
>> Sent: Saturday, March 18, 2006 2:52 PM
>> To: 1000mp Reflector
>> 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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>>
>
>
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