KIO2 outside of K2
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Hi all,
I noticed that the KIO2 option uses a standard conversion chip like the Maxim 232, but does not use optoisolators. I guess the optoislators would not help when the KIO2 is inside the radio close to the other circuits. I also noted that the KIO2 can generate noise. Has anyone ever considered using the KIO2 with optoisolators added outside of the K2 chassis? My limited experience with my homebrew interface for a Kenwood CAT says that it would be much easier to eliminate the interference, and since the cable to the computer is outside the radio, the RS232 interface being outside the radio would not be much of an inconvienience. Just a thought. Steve, W2MY --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.794 / Virus Database: 538 - Release Date: 11/10/2004 _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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Steve,
If the cable to the computer is built as specified in the KIO2 (or KPA100) instruction manual, noise pickup is minimized - the frame ground (pin 1) is connected only at the K2 end, and any noise on the computer frame ground is not conducted onto the cable. I would expect any improvement gained by using optoisolators to be minimal - perhaps someone should try it and see. Optoisolators are useful as a solution for ground loops in situations where they are likely to occur - such as instances when the connecting cable parameters are not known or specified. One advantage to optoisolators is that separation of the signal ground in addition to frame ground is possible, but proper care must be exercised in the design to assure that this isolation is still present after the circuit is packaged (frame ground can be inadvertently made continuous even with the use of optoisolators by conduction through a metallic enclosure). There is little advantage to be gained by separating the signal ground for RS-232 level signals unless the cable run is very long (more than 50 feet or so) and ground reference level shift creates a problem with the switching levels at the receiver. For my $0.02 worth, I would not predict any improvement. 73, Don W3FPR ----- Original Message ----- > Hi all, > I noticed that the KIO2 option uses a standard conversion chip like the > Maxim 232, but does not use optoisolators. I guess the optoislators would > not help when the KIO2 is inside the radio close to the other circuits. I > also noted that the KIO2 can generate noise. Has anyone ever considered > using the KIO2 with optoisolators added outside of the K2 chassis? My > limited experience with my homebrew interface for a Kenwood CAT says that > it > would be much easier to eliminate the interference, and since the cable to > the computer is outside the radio, the RS232 interface being outside the > radio would not be much of an inconvienience. Just a thought. > _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by Steven Pituch
Jack said:
>Steve; >What is it you are trying to do? >> I noticed that the KIO2 option uses a standard conversion chip like >> the Maxim 232, but does not use optoisolators. Hi Jack, With my limited knowledge from scratch building an rs232 interface, I thought it might be better for the interface in the K2 to be outside the rig for isolation purposes. I thought the farther away it was from the xcvr the better things might be. However, you have shown me that I was talking about a different type of problem with regard to the optoisolators. My plans are: 1)to update my K2 #402, 2)add a KIO2, 3)do some digital QSOs with CAT control, 4)eventually add the KPA100 inside the K2 enclosure, and eventually 5)remote the KPA100 and a KA100 in an EC2 enclosure. Which brings up another question. Is the remote KPA100 option approved by Elecraft? I see that people have done this, but I haven't found any actual Elecraft documentation on it. Steve, W2MY --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.794 / Virus Database: 538 - Release Date: 11/10/2004 _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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