[1000mp] FSK interface using opto-isolators

[Pete Smith]

Yup.

73, Pete

At 07:59 AM 12/3/2004, you wrote:

>Hi Pete,
>
>I assume you do know that for semi-breakin VOX must be on, right?
>
>73,
>Art
>W2NRA
>
>----- Original Message ----- From: "Pete Smith" <n4zr at contesting.com>
>To: "All about Yaesu 1000mp" <1000mp at mailman.qth.net>
>Sent: Friday, December 03, 2004 12:17
>Subject: Re: [1000mp] FSK interface using opto-isolators
>
>
>>I tried an optoisolator interface for CW with my Mark 5, and found that 
>>the CW opto did not pull the key line low enough to trigger the 
>>semi-break-in -- I got CW sidetone but no actual RF.  No doubt this could 
>>have been solved by someone who knew what they were doing.  But there 
>>definitely is enough current to drive an ordinary optoisolator, at least 
>>in a desktop port, judging by my experience.
>>
>>73, Pete
>>
>>PS -- I have never had any problem with ground loops involving the serial 
>>or parallel port on my computer and my Mark 5, except for the sound card 
>>to microphone connection.  An isolation transformer solved the problem 
>>there.  And before anyone writes to ask why I didn't use a back panel 
>>audio input, I use the connection for stored voice messages in phone 
>>contests, and wanted to be able to route the audio through my SO2R box, 
>>along with PTT.
>>
>>  At 06:30 PM 12/2/2004, you wrote:
>>
>>
>>
>>>
>>>  Hi Group,
>>>
>>>Is it possible to use opto-isolators to generate both the Shift and PTT 
>>>using the computer serial Com port? If so, what would the value be for 
>>>the resistor be to operate the LED? More important, does the serial port 
>>>have enough current to drive an opto-isolator? I plan to operate RTTY 
>>>using FT1000 Mk5 Field and opto-isolators would completely eliminate any 
>>>ground loops.
>>>
>>>  Thank you,
>>>John V.
>>>
>>>
>>>
>>>
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>>
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