RS-232 Cable Question
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I have a K2 and a K3. I clearly see in the K2 manual that a special cable is
needed but it appears the K3 is a standard RS232 pinout. 1, I want to confirm the K3 does use a regular RS232 cable (before I fry something!) 2. Does any manufacture K2 RS232 cables? I didn't see anything on the Elecraft site or a quick web check... TIA! 73... --Ken WA4SQM -- The Lord's Prayer is 66 words, the Gettysburg Address is 286 words, there are 1,322 words in the Declaration of Independence, but government regulations on the sale of cabbage total 26,911 words. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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> 2. Does any manufacture K2 RS232 cables?
Sure ... You do! The K2 is a 'melt-solder' kit. The K2 manual spells out how to make the correct cable. The K3 uses 'normal' 9pin serial cables. The K2's cable included Elecraft's aux-bus info for the external ATU. The K3 mounts the ATU internally. If a K3 external accessory needs aux-bus data, it is available on the ACC connector. (Which is _not_ a VGA cable!) Mark AD5SS On Thu, Mar 18, 2010 at 4:25 PM, K. Edwards <[hidden email]> wrote: > I have a K2 and a K3. I clearly see in the K2 manual that a special cable is > needed but it appears the K3 is a standard RS232 pinout. > > 1, I want to confirm the K3 does use a regular RS232 cable (before I fry > something!) > 2. Does any manufacture K2 RS232 cables? I didn't see anything on the > Elecraft site or a quick web check... > > TIA! > > 73... > > --Ken WA4SQM > > -- Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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In reply to this post by Ken - WA4SQM
The computer cable for the K2 requires only three wires connecting
pins 2, 3 and 5 on each end. The other pins must not be connected since the KIO2 signals on these pins are not RS-232 capable. Connecting them to an RS-232 connector will cause damage in the K2. The K3 can use a standard RS-232 cable. A standard 9-conductor straight-through cable will work just fine. AD5SS is correct. While the KRC2 and Transverters can connect to the K2 using a short straight-through cable, you need a two conductor cable connected to the K3's Aux IO port to use these devices with the K3. Hope this helps. Jack Brindle, W6FB Elecraft Engineering On Mar 18, 2010, at 2:25 PM, K. Edwards wrote: > I have a K2 and a K3. I clearly see in the K2 manual that a special > cable is > needed but it appears the K3 is a standard RS232 pinout. > > 1, I want to confirm the K3 does use a regular RS232 cable (before I > fry > something!) > 2. Does any manufacture K2 RS232 cables? I didn't see anything on the > Elecraft site or a quick web check... > > TIA! > > 73... > > --Ken WA4SQM > > -- > > > > > > > > > > > > The Lord's Prayer is 66 words, the Gettysburg Address is 286 words, > there > are 1,322 words in the Declaration of Independence, but government > regulations on the sale of cabbage total 26,911 words. > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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In reply to this post by Ken - WA4SQM
Ken:
The K3 uses a straight-through RS-232 cable with DB-9 connectors on either end. The most common of these cables has all 9 pins connected, M-F, no crossovers. The cable is described in the K3 Utility Help. Not all of these pins are required for normal operation, but it doesn't hurt to have them all connected. You can load firmware with just ground, TxD and RxD connected. CTS and DTR can be also used for PTT and CW keying. The K2 cable is part of the KIO2 kit. The wiring for it can be found on page 13 of the KIO2 manual, and a link to the KIO2 manual PDF is on the Elecraft web site's manual page. I know of no commercially available cable that has this wiring. Do not use your K2 KIO2 cable for your K3. 73 de Dick, K6KR -----Original Message----- From: [hidden email] [mailto:[hidden email]] On Behalf Of K. Edwards Sent: Thursday, March 18, 2010 2:26 PM To: [hidden email] Subject: [Elecraft] RS-232 Cable Question I have a K2 and a K3. I clearly see in the K2 manual that a special cable is needed but it appears the K3 is a standard RS232 pinout. 1, I want to confirm the K3 does use a regular RS232 cable (before I fry something!) 2. Does any manufacture K2 RS232 cables? I didn't see anything on the Elecraft site or a quick web check... TIA! 73... --Ken WA4SQM -- The Lord's Prayer is 66 words, the Gettysburg Address is 286 words, there are 1,322 words in the Declaration of Independence, but government regulations on the sale of cabbage total 26,911 words. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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Thanks Dick and Jack...
I just wanted to be certain I was not missing something IRT to the K3. I saw the info in the KIO2 manual on building the cable, but thought I had seen something about pre-made cables (which would undoubtedly be MUCH prettier than anything I can turn out!). As I bought the K2 already assembled, with the KIO2 installed, I guess I didn't get the cable or connectors. 73... --Ken On Thu, Mar 18, 2010 at 6:24 PM, Dick Dievendorff <[hidden email]>wrote: > Ken: > > The K3 uses a straight-through RS-232 cable with DB-9 connectors on either > end. The most common of these cables has all 9 pins connected, M-F, no > crossovers. The cable is described in the K3 Utility Help. > > Not all of these pins are required for normal operation, but it doesn't > hurt > to have them all connected. You can load firmware with just ground, TxD > and > RxD connected. CTS and DTR can be also used for PTT and CW keying. > > The K2 cable is part of the KIO2 kit. The wiring for it can be found on > page 13 of the KIO2 manual, and a link to the KIO2 manual PDF is on the > Elecraft web site's manual page. I know of no commercially available cable > that has this wiring. > > Do not use your K2 KIO2 cable for your K3. > > 73 de Dick, K6KR > > > -----Original Message----- > From: [hidden email] > [mailto:[hidden email]] On Behalf Of K. Edwards > Sent: Thursday, March 18, 2010 2:26 PM > To: [hidden email] > Subject: [Elecraft] RS-232 Cable Question > > I have a K2 and a K3. I clearly see in the K2 manual that a special cable > is > needed but it appears the K3 is a standard RS232 pinout. > > 1, I want to confirm the K3 does use a regular RS232 cable (before I fry > something!) > 2. Does any manufacture K2 RS232 cables? I didn't see anything on the > Elecraft site or a quick web check... > > TIA! > > 73... > > --Ken WA4SQM > > -- > > > > > > > > > > > > The Lord's Prayer is 66 words, the Gettysburg Address is 286 words, there > are 1,322 words in the Declaration of Independence, but government > regulations on the sale of cabbage total 26,911 words. > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > > -- The Lord's Prayer is 66 words, the Gettysburg Address is 286 words, there are 1,322 words in the Declaration of Independence, but government regulations on the sale of cabbage total 26,911 words. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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In reply to this post by Jack Brindle
On Thu, 18 Mar 2010 14:52:28 -0700, Jack Brindle wrote:
>The computer cable for the K2 requires only three wires connecting >pins 2, 3 and 5 on each end. For any serial cable used in a ham shack, including this one, you should use twisted pair cable for each circuit to minimize RFI susceptibility. I learned this the hard way in Chicago, when my 160M/80M TX antenna was a long wire ending in the shack. The best, most readily available twisted pair cable is CAT5. Shielding is NOT important. It also helps to terminate the return for each circuit to the connector shell, NOT to pin 5. This bypasses the "pin 1 problem" common to most serial interfaces. For detailed info on how to build this serial cable, see http://audiosystemsgroup.com/RFI-Ham.pdf and http://audiosystemsgroup.com/HamInterfacing.pdf The stock K2 cable, made with shielded parallel conductors, locked up keying from the computer with less than 10 watts out of the K2 running barefoot. The cable I made using CAT5 allowed me to run full legal power with my K2 driving a Ten Tec Titan to legal power. I told Wayne about this more than five years ago, but last I heard, the K2 cable is still made with straight parallel wires. 73, Jim Brown K9YC ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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In reply to this post by Ken - WA4SQM
Ken,
For those purchasing a used K2, this seems to be a common problem, the seller may not provide all the cables and accessories that originally came with the K2 and its options. That includes a 2.1mm coaxial power plug, a 3.5mm stereo plug that may be used for the key jack, the internal frequency counter probe (needed for filter alignment), the KIO2 (or KPA100) cable to the computer, and for the KPA100, the power cable with the fuse, Anderson Power Pole connector parts and #12 wire. Recent K2s also had the parts for constructing an RF probe using the Switch Spacing Tool for the PC board - an alignment tool and a hex wrench set (for the knob setscrews) were also provided with the original K2 kit. All those parts can be ordered from Elecraft. In the case of the K2 computer cable the wire, connectors, and backshells to construct a cable may be ordered from most any distributor since these are standard items (look under D-sub connectors), although a short (4 to 6 foot) length of 4 conductor shielded cable (only 3 conductors are needed) may be difficult to find - you may have to buy a much longer spool of it unless the distributor sells it by the foot. 73, Don W3FPR K. Edwards wrote: > Thanks Dick and Jack... > I just wanted to be certain I was not missing something IRT to the K3. > > I saw the info in the KIO2 manual on building the cable, but thought I had > seen something about pre-made cables (which would undoubtedly be MUCH > prettier than anything I can turn out!). As I bought the K2 already > assembled, with the KIO2 installed, I guess I didn't get the cable or > connectors. > > > Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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