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Groups > linux.debian.user > #158465 > unrolled thread
| Started by | Danny <mynixmail@gmail.com> |
|---|---|
| First post | 2015-09-30 16:00 +0200 |
| Last post | 2015-10-05 23:00 +0200 |
| Articles | 5 on this page of 25 — 8 participants |
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Sound card question Danny <mynixmail@gmail.com> - 2015-09-30 16:00 +0200
Re: Sound card question rlharris@oplink.net - 2015-09-30 16:40 +0200
Re: Sound card question Danny <mynixmail@gmail.com> - 2015-10-01 15:50 +0200
Re: Sound card question Doug <dmcgarrett@optonline.net> - 2015-09-30 19:50 +0200
Re: Sound card question Seeker <seeker5528@comcast.net> - 2015-10-01 08:20 +0200
Re: Sound card question Rob van der Putten <rob@sput.nl> - 2015-10-01 12:10 +0200
Re: Sound card question Danny <mynixmail@gmail.com> - 2015-10-01 16:00 +0200
Re: Sound card question Rob van der Putten <rob@sput.nl> - 2015-10-01 18:00 +0200
Re: Sound card question Danny <mynixmail@gmail.com> - 2015-10-01 16:00 +0200
Re: Sound card question Danny <mynixmail@gmail.com> - 2015-10-01 16:00 +0200
Re: Sound card question rlharris@oplink.net - 2015-10-01 17:30 +0200
Re: Sound card question Doug <dmcgarrett@optonline.net> - 2015-10-01 23:00 +0200
Re: Sound card question rlharris@oplink.net - 2015-10-02 00:20 +0200
Re: Sound card question rlharris@oplink.net - 2015-10-02 01:00 +0200
Re: Sound card question Danny <mynixmail@gmail.com> - 2015-10-02 17:30 +0200
Re: Sound card question Doug <dmcgarrett@optonline.net> - 2015-10-02 19:20 +0200
Re: Sound card question rlharris@oplink.net - 2015-10-02 20:40 +0200
Re: Sound card question Doug <dmcgarrett@optonline.net> - 2015-10-03 00:40 +0200
Re: Sound card question rlharris@oplink.net - 2015-10-03 04:20 +0200
Re: Sound card question Doug <dmcgarrett@optonline.net> - 2015-10-03 06:30 +0200
RE: Sound card question "Larry Owens" <owens@netptc.net> - 2015-10-02 19:20 +0200
Re: Sound card question David Wright <deblis@lionunicorn.co.uk> - 2015-10-02 19:30 +0200
Re: Sound card question Stuart Longland <stuartl@longlandclan.id.au> - 2015-10-04 01:20 +0200
Re: Sound card question rlharris@oplink.net - 2015-10-04 02:30 +0200
Re: Sound card question Stuart Longland <stuartl@longlandclan.id.au> - 2015-10-05 23:00 +0200
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| From | "Larry Owens" <owens@netptc.net> |
|---|---|
| Date | 2015-10-02 19:20 +0200 |
| Message-ID | <qfc9Y-1mW-25@gated-at.bofh.it> |
| In reply to | #158520 |
-----Original Message----- From: Danny [mailto:mynixmail@gmail.com] Sent: Friday, October 02, 2015 8:27 AM To: debian-user@lists.debian.org Subject: Re: Sound card question > I believe that the output of the headphone jack is not impedance > matched--I expect it's just a voltage source. Wat's more, unless you > are plugging the same low-impedance devices into both Y outputs, _and_ > the source is impedance matched, you would not split the power > equally. I don't know what you want to do with the second output, but it's more than likely a relatively high impedance, so it would not load the circuit at all. > I could be wrong, but it seems logical to me. > > --doug O.k ... let me explain why I asked the question for the sake of satisfying any curiosity: I have EchoLink (Ham Radio VOIP) connected to Jessie like this: VHF Transceiver (with two interface cables going to the MIC and LINE-OUT jacks on the back of an internal sound card. Incoming audio (radio frequency) goes through the antenna ... through the transciever ... to the sound card (via the MIC interface cable) ... it gets processed by the sound card and stuff happens on VOIP ... Because the VHF transceiver is effectively turned into a repeater NO transmit or recieve audio can be heard on the transciever itself (as it should be). In order to hear comms coming in or out of the transciever (via an antenna) one has to connect to the transciever with ANOTHER transciever in order to hear people talk (if you are tuned to the same frequency off course) Now ... my second transciever is fitted inside my car ... in order for me to hear all comms on the frequency I need to go to my car and turn that transciever on every now and then which becomes a pain in the donkey ... ;) ... In order for me NOT to make a trip to the car every 10 minutes I though of splitting the LINE-OUT and add a normal set of desktop speakers. So ... I was just wondering if I will have any losses (in whatever form) when I "split" the signal ... keep in mind that the audio signals processed by the sound card should be strong and reliable ... Thank You Danny Normally when a signal is "split" you should have "identical" impedences on both sides of the split. Assuming this is so the resulting signal on either side of the split should be down by 3db or "half". Normally the amplifiers which are at the end of the split signal have enough gain so that 3db should not affect the sound quality. Larry
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| From | David Wright <deblis@lionunicorn.co.uk> |
|---|---|
| Date | 2015-10-02 19:30 +0200 |
| Message-ID | <qfcjE-1AV-5@gated-at.bofh.it> |
| In reply to | #158520 |
Quoting Danny (mynixmail@gmail.com): > In order for me NOT to make a trip to the car every 10 minutes I though of > splitting the LINE-OUT and add a normal set of desktop speakers. > > So ... I was just wondering if I will have any losses (in whatever form) when I > "split" the signal ... keep in mind that the audio signals processed by the sound > card should be strong and reliable ... I assume "desktop speakers" are designed to present a load comparable with headphones, or at least compatible with typical sound card capabilities. They will soak up a little of the current available at the output, while your rig will only be interested in the output voltage which will be unaffected. (Am I saying all this to a licensed ham?) My desktop soundcard had to drive a pair of Jordan Watts like these: https://pbs.twimg.com/media/BAbT1p2CUAA0Di0.jpg but I wouldn't recommend that for you. However, my concern is for how you deal with the volume control. I assume your rig wants the output turned up loud so that's what you'll get through your Y-splitter (Y-sharer might be a better term). What I do (currently on my server in the basement) is connect the output to the line/aux input of an old ghettoblaster (cassette mechanisms long worn out) which gives me not only volume but tone controls too. If you haven't got any of your own, their are junk shops, charity shops, neighbours... This solution is safer with headphones too, when the software unexpectedly maxes the volume. Cheers, David.
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| From | Stuart Longland <stuartl@longlandclan.id.au> |
|---|---|
| Date | 2015-10-04 01:20 +0200 |
| Message-ID | <qfEfT-7WY-3@gated-at.bofh.it> |
| In reply to | #158520 |
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On 03/10/15 01:27, Danny wrote: > In order to hear comms coming in or out of the transciever (via an antenna) one > has to connect to the transciever with ANOTHER transciever in order to hear > people talk (if you are tuned to the same frequency off course) > > Now ... my second transciever is fitted inside my car ... in order for me to > hear all comms on the frequency I need to go to my car and turn that transciever > on every now and then which becomes a pain in the donkey ... ;) ... Another option, get a small handheld transceiver that you can tune to the appropriate frequency. This also lets you adjust volume levels so that you don't overdrive the input on the transceiver. Nothing worse than a contact with a garbled station because the microphone input is being overdriven. (We have this from time to time on VK4RBN.) -- Stuart Longland (aka Redhatter, VK4MSL) I haven't lost my mind... ...it's backed up on a tape somewhere.
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| From | rlharris@oplink.net |
|---|---|
| Date | 2015-10-04 02:30 +0200 |
| Message-ID | <qfFlD-10O-1@gated-at.bofh.it> |
| In reply to | #158570 |
On Sat > Another option, get a small handheld transceiver that you can tune to > the appropriate frequency. > > This also lets you adjust volume levels so that you don't overdrive the > input on the transceiver. Nothing worse than a contact with a garbled > station because the microphone input is being overdriven. All that is needed for monitoring is a VHF/UHF scanner. CW is to amateur radio much as is CLI to computing. And a microphone is the analogue of a GUI. Russ
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| From | Stuart Longland <stuartl@longlandclan.id.au> |
|---|---|
| Date | 2015-10-05 23:00 +0200 |
| Message-ID | <qgl1w-1KE-9@gated-at.bofh.it> |
| In reply to | #158571 |
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On 04/10/15 10:22, rlharris@oplink.net wrote: >> This also lets you adjust volume levels so that you don't overdrive the >> > input on the transceiver. Nothing worse than a contact with a garbled >> > station because the microphone input is being overdriven. > All that is needed for monitoring is a VHF/UHF scanner. True, a handheld transceiver can often be bought for the same price or less and in this situation, performs more functionality as it allows adjustments of transmit audio the other way too. This is why I suggested it. > CW is to amateur radio much as is CLI to computing. > And a microphone is the analogue of a GUI. Not quite. ;-) -- Stuart Longland (aka Redhatter, VK4MSL) I haven't lost my mind... ...it's backed up on a tape somewhere.
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