K3 Psk audio connections
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I was wondering if anyone knew which is the left and right channels on a pc sound card out to hook to the line in on the K3. Left is A and B is right but which is which on the connector? I assume I use a mono on the K3 side and a stereo connector on the pc side. I'd like to try digi on this beasty.
Randy K8RDD |
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Randy,
There is nothing wrong with using a stereo plug on both ends. You can use an already constructed (purchased) stereo cable - the connector in the K3 is stereo, but wired for mono (that is nothing connected to the ring), so you will not be shorting the soundcard output. If you build your cable, you may wire just the tip and the sleeve. The tip is normally the left channel and the ring is the right channel. 73, Don W3FPR K8RDD wrote: > I was wondering if anyone knew which is the left and right channels on a pc > sound card out to hook to the line in on the K3. Left is A and B is right > but which is which on the connector? I assume I use a mono on the K3 side > and a stereo connector on the pc side. I'd like to try digi on this beasty. > Randy > K8RDD > > _______________________________________________ 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 K8RDD
Should one be concerned with connecting the K3 stereo line out to a mono (or microphone) input on the PC? Seems like that would short out one channel of the K3 line out.
Thanks. KE7X -----Original Message----- From: [hidden email] [mailto:[hidden email]] On Behalf Of R. Kevin Stover Sent: Thursday, January 15, 2009 6:16 AM To: K8RDD Cc: [hidden email] Subject: Re: [Elecraft] K3 Psk audio connections Line Out of the sound card goes to Line In on the K3, Line In on the sound card goes to Line Out on the K3. You can use stereo cables as the connectors in the K3 don't use the ring connection and you can't short anything out. K8RDD wrote: > I was wondering if anyone knew which is the left and right channels on > a pc sound card out to hook to the line in on the K3. Left is A and B > is right but which is which on the connector? I assume I use a mono on > the K3 side and a stereo connector on the pc side. I'd like to try digi on this beasty. > Randy > K8RDD > -- R. Kevin Stover, ACØH This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This message contains confidential information and is intended only for the individual named. If you are not the named addressee you should not disseminate, distribute or copy this e-mail. _______________________________________________ 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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The audio Line-In/Out connections on the KIO3 are not stereo, even
though they use a three conductor or "stereo " jack. The tip is left channel, no connection to ring, and ground on the sleeve. Cady, Fred wrote: > Should one be concerned with connecting the K3 stereo line out to a mono (or microphone) input on the PC? Seems like that would short out one channel of the K3 line out. > > Thanks. > KE7X _______________________________________________ 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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I haven't looked at the schematic but on the back of the rig, the line
out is marked stereo with the little warning triangle. -----Original Message----- From: Kevin [mailto:[hidden email]] Sent: Thursday, January 15, 2009 7:53 AM To: Cady, Fred Cc: [hidden email] Subject: Re: [Elecraft] K3 Psk audio connections The audio Line-In/Out connections on the KIO3 are not stereo, even though they use a three conductor or "stereo " jack. The tip is left channel, no connection to ring, and ground on the sleeve. Cady, Fred wrote: > Should one be concerned with connecting the K3 stereo line out to a mono (or microphone) input on the PC? Seems like that would short out one channel of the K3 line out. > > Thanks. > KE7X This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This message contains confidential information and is intended only for the individual named. If you are not the named addressee you should not disseminate, distribute or copy this e-mail. _______________________________________________ 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 K8RDD
If the sub rx is installed the ring carries the sub rx audio.
------------------------- 73, Greg - AB7R Whidbey Island WA NA-065 On Thu Jan 15 6:53 , Kevin sent: >The audio Line-In/Out connections on the KIO3 are not stereo, even >though they use a three conductor or "stereo " jack. The tip is left >channel, no connection to ring, and ground on the sleeve. > >Cady, Fred wrote: >> Should one be concerned with connecting the K3 stereo line out to a mono (or microphone) input on the PC? Seems like that would short out one channel of the K3 line out. >> >> Thanks. >> KE7X > >_______________________________________________ >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 _______________________________________________ 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 Cady, Fred
Fred,
No worries, see my posting on the Elecraft reflector at 8:09 this morning. 73, Don W3FPR Cady, Fred wrote: > Should one be concerned with connecting the K3 stereo line out to a mono (or microphone) input on the PC? Seems like that would short out one channel of the K3 line out. > > Thanks. > KE7X > > > -----Original Message----- > From: [hidden email] [mailto:[hidden email]] On Behalf Of R. Kevin Stover > Sent: Thursday, January 15, 2009 6:16 AM > To: K8RDD > Cc: [hidden email] > Subject: Re: [Elecraft] K3 Psk audio connections > > Line Out of the sound card goes to Line In on the K3, Line In on the sound card goes to Line Out on the K3. You can use stereo cables as the connectors in the K3 don't use the ring connection and you can't short anything out. > > K8RDD wrote: > >> I was wondering if anyone knew which is the left and right channels on >> a pc sound card out to hook to the line in on the K3. Left is A and B >> is right but which is which on the connector? I assume I use a mono on >> the K3 side and a stereo connector on the pc side. I'd like to try digi on this beasty. >> Randy >> K8RDD >> > > > > -- > R. Kevin Stover, ACØH > This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This message contains confidential information and is intended only for the individual named. If you are not the named addressee you should not disseminate, distribute or copy this e-mail. > _______________________________________________ > 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 > ------------------------------------------------------------------------ > > > No virus found in this incoming message. > Checked by AVG - http://www.avg.com > Version: 8.0.176 / Virus Database: 270.10.7/1895 - Release Date: 1/15/2009 7:46 AM > > 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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OK, guys, here is the real skinny, from the schematics:
As shown on the K3 Block Diagram (6/6/07), The DSP RX section provides a two channel AUX AF Out to the KIO3 board. This stereo signal is transformer coupled (see KIO3 Main - Sheet 3) to the Audio IO Board. The KIO3 - Audio Board does indeed show a stereo LINE OUT with the LINEJACK_R on the ring and LINEJACK_L on the tip. The input side of the audio transformers on the KIO3 board have series 600 ohm resistors. Thus it is possible to short the ring to the ground (which worst case could happen even by using a stereo cable between the K3 and a mono Line In or Mic In on a computer, depending on the computer input circuitry and if the computer and K3 grounds are connected). But, due to the transformer coupling in the KIO3, you won't hurt the K3. (Probably) :-) Cheers, Fred Fred Cady fcady at ieee dot org > -----Original Message----- > From: Don Wilhelm [mailto:[hidden email]] > Sent: Thursday, January 15, 2009 8:03 AM > To: Cady, Fred > Cc: [hidden email] > Subject: Re: [Elecraft] K3 Psk audio connections > > Fred, > > No worries, see my posting on the Elecraft reflector at 8:09 > this morning. > > 73, > Don W3FPR > _______________________________________________ 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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Fred,
We *were* talking about the K3 LINE IN (or so I thought). That uses a stereo jack, but is only connected to the tip. For those who need to convince themselves, plug a bare 3.5mm stereo plug into the LINE IN jack and measure the resistance between the ring and ground - you will find it is open circuit (nothing connected, and not grounded). The tip, however has about 640 ohms resistance to ground - that says that one can use an off-the-shelf stereo cable between the computer line out and the K3 line end without concern for either the computer nor the K3. As for the K3 LINE OUT, that is stereo. The main receiver connects to the tip (left channel) and the subRX connects to the ring (right channel). If the sub is not installed, there may be some noise on the right channel, but no sound. The transformer coupling is assurance that no damage will occur if either of the line out channels is shorted to ground. So if one uses a mono cable here, it will cause no damage, but nothing will be heard in the right channel of the soundcard. Most computer soundcards will not be damaged by plugging a mono jack or a stereo jack with the ring grounded into the mic connector. Most soundcards use the ring to provide bias to the electret elements found in many computer mics, so they do apply a voltage to the ring, but it is through a resistor of a value high enough that shorting the ring of the soundcard mic connector should not cause any damage, but then I do not know the particulars of all soundcards - if you are concerned, consult the soundcard manufacturer (if you can!). 73, Don W3FPR Cady, Fred wrote: > OK, guys, here is the real skinny, from the schematics: > As shown on the K3 Block Diagram (6/6/07), The DSP RX section provides a > two channel AUX AF Out to the KIO3 board. This stereo signal is > transformer coupled (see KIO3 Main - Sheet 3) to the Audio IO Board. The > KIO3 - Audio Board does indeed show a stereo LINE OUT with the > LINEJACK_R on the ring and LINEJACK_L on the tip. The input side of the > audio transformers on the KIO3 board have series 600 ohm resistors. Thus > it is possible to short the ring to the ground (which worst case could > happen even by using a stereo cable between the K3 and a mono Line In or > Mic In on a computer, depending on the computer input circuitry and if > the computer and K3 grounds are connected). But, due to the transformer > coupling in the KIO3, you won't hurt the K3. (Probably) :-) > > Cheers, > Fred > > > Fred Cady > fcady at ieee dot org > > 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 ac0h
Hi,
In the interest of protecting the audio amplifier I have just added the two 470 ohm resistors as per the modification. I now get thump on my powered speakers when I power up the K3, or plug in the headphones. I do not recollect this happening before. 73 Tim gm4lmh _______________________________________________ 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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