Re: [IRCA] Audio Optoisolaters

[John Hunter <jshunter@xxxxxxxxxxx>]

Hi Curt, Thanks for the links. I definitely need the RS232 adapter but that 
can wait until I get my radio audio isolated from the computer. To record 
stuff I'm having to use portable radios plugged into the MIC jack for now 
and I'm missing out on a lot of stuff.
Thanks again!
sincerely,
John Hunter
Rossville, GA

At 02:10 PM 12/2/2005, you wrote:
>John,
>
>I managed to read into your question what I had just done rather than what 
>you were asking.  Somehow I completely overlooked that you were talking 
>about audio and not RS-232 interfacing of your receiver.
>
>Fortunately Craig Healy offered an alternative to what you were really 
>looking for.  I'll be interested to know of your results.
>
>Not that it matters anymore, but there is a possible optical solution to 
>your *audio* problem, in addition to the one I mentioned for 
>RS-232.  Using a pair of Toslink converters and a length of matching cable 
>would provide an optical barrier to electrical noise between the PC and 
>receiver.  This approach would be more expensive though, probably about 
>seventy dollars.  I have not tried this, but it seems straightforward, 
>though not so simple as the transformer solution.
>
>If you're interested for future reference, something to look at are the 
>POF-820 and POF-830 converter pair:
><http://www.ramelectronics.net/html/audio_toslink_adapters.html#pof-820>http://www.ramelectronics.net/html/audio_toslink_adapters.html#pof-820
>Here are good descriptions of Toslink cables and a wide variety, which 
>could be used between the converters:
><http://www.ramelectronics.net/html/audio_toslink_cables.html>http://www.ramelectronics.net/html/audio_toslink_cables.html
>
>Curt
>
>W. Curt Deegan
>
>
>John Hunter wrote:
>>
>>Thanks Curt! Do you know of any that isolate the receiver audio output into
>>the line in of a computers sound card? I would like to use SeaTTY for RTTY
>>and NAVFAX and also CWGet to help with NDB identification. As soon as I
>>plug my receivers into the MIC or Line in jack I get a very loud hash in
>>the radios that interferes with recording, etc.
>>Thanks!
>>John Hunter
>>Rossville, GA
>>
>>At 10:22 PM 12/1/2005, you wrote:
>>
>>>
>>>Take a look at this link:
>>><http://www.bb-elec.com/product_family.asp?FamilyId=1>http://www.bb-elec.com/product_family.asp?FamilyId=1
>>>
>>>Be aware that the 9SPOP2 requires power from the attached device
>>>interface.  The RS-320 will not work with this adapter because not all
>>>lines are present in the interface.  At least that is my assessment.  I
>>>have this coupler and it will not work with the RS-320.  I think the
>>>9POP4 will, because it uses an external power source.  I have not tried
>>>this one, however.
>>>
>>>I have used the 9SPOP2 with another computer-to-receiver arrangement and
>>>it worked quite well in eliminating a large part of the computer noise.
>>>Physical placement also helped.
>>>
>>>Curt
>>>
>>>W. Curt Deegan
>>>
>>>
>>>John Hunter wrote:
>>>
>>>
>>>>
>>>>Hi again, Sorry for the recent barrage of questions but I am trying to
>>>>solve  some severe RF-EMI problems. I went ahead yesterday and rolled a
>>>>balun using a core of unknown composition and when I turned on the radio
>>>>and went down into LW I noticed that the LOUD AC buzz that had previously
>>>>plagued that area was completely gone and the band was full of previously
>>>>unheard beacons! It also worked well up to 30 mc.
>>>>Now I am trying to get rid of the noise introduced into my receivers from
>>>>my computer and remember reading that someone had found a place that sold
>>>>Audio Optoisolaters to connect the two together eliminating the
>>>>computer"hash" and monitor noise. Unfortunately I can't find that email or
>>>>any web site that sells them. Does anyone know where I can get one? Any
>>>>help would be greatly appreciated.
>>>>Sincerely,
>>>>John Hunter
>>>>Rossville GA
>>>>
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