Re: [Elecraft] Audio Output Impedance of the KX3

2017-01-25 Thread w7aqk
Jim and All, Thanks much for the explanation. Makes a lot more sense now. Not sure how I missed your past comments that covered that. I also got several other responses which were most helpful, and I appreciate them as well. It sure is nice to ask a question and get good answers!! Hi.

Re: [Elecraft] Audio Output Impedance of the KX3

2017-01-23 Thread Mel Farrer via Elecraft
impedance issues. Mel, K6KBE From: Don Wilhelm <donw...@embarqmail.com> To: w7aqk <w7...@cox.net>; Elecraft Reflector <elecraft@mailman.qth.net> Sent: Monday, January 23, 2017 1:35 PM Subject: Re: [Elecraft] Audio Output Impedance of the KX3 David, Let me try to r

Re: [Elecraft] Audio Output Impedance of the KX3

2017-01-23 Thread Don Wilhelm
David, Let me try to respond and perhaps Jim will chime in a well. Modern audio amplifier output stages are very low output impedance devices. As such, they can produce as much power as the device connected will allow. In a practical design of course there is a limit to how much current the

Re: [Elecraft] Audio Output Impedance of the KX3

2017-01-23 Thread Jim Brown
On Mon,1/23/2017 12:54 PM, Jim Brown wrote: The impedance of mics is defined as 5X their minimum load impedance. Correction -- one-fifth of their minimum load impedance. For example, a 250 ohm mic should drive an input impedance no lower than 1.25K. Most pro mics are in the range of 150-250

Re: [Elecraft] Audio Output Impedance of the KX3

2017-01-23 Thread Jim Brown
Hi Dave, I've written about this many times, but here goes again. :) Your choice of the words "designed impedance" is a good one. Audio output stages have an internal impedance MUCH lower than the loads they are designed to drive. For example, a typical speaker output stage is designed to

Re: [Elecraft] Audio Output Impedance of the KX3

2017-01-23 Thread w7aqk
Jim, Maybe you could expand on that somewhat as I'm still confused a bit. Perhaps I'm not understanding what I hear, or why, but it almost always seems that when speakers (or headphones) are not closely matched to the designed impedance I notice some deterioration in output. Some mismatch

Re: [Elecraft] Audio Output Impedance of the KX3

2017-01-23 Thread ANCLETUS ERNEST
I use from day one headset insten with mic works very will >From my DL750 Digicel On Jan 23, 2017 2:35 PM, a...@sbcglobal.net wrote: A good question? See you got specific answer for K3/K3S but not KX3. Any direct answers for KX3, rather than different headsets? I would go for earbuds for

Re: [Elecraft] Audio Output Impedance of the KX3

2017-01-23 Thread ac5p
A good question?   See you got specific answer for K3/K3S but not KX3.   Any direct answers for KX3, rather than different headsets?   I would go for earbuds for lightest weight but would like high efficiency type with KX3.    Anyone found a good efficient set of earbuds with the KX3?   73,

Re: [Elecraft] Audio Output Impedance of the KX3

2017-01-23 Thread Fred Jensen
I think it is very low on practically all of today's radios and it doesn't matter, the output stage will drive anything. 73, Fred ["Skip"] K6DGW Sparks NV DM09dn Washoe County On 1/23/2017 9:00 AM, Joe W2KJ wrote: Howdy Gang: Checked the KX3 manual but was unable to find the audio output

Re: [Elecraft] Audio Output Impedance of the KX3

2017-01-23 Thread Eric Swartz - WA6HHQ, Elecraft
For the speaker output, the K3 and K3S are optimized for 4 ohms. The SP3 is a 4 ohm speaker. 8 Ohm speakers work fine, but a a slightly lower audio output for the same volume control position. Eric /elecraft.com/ On 1/23/2017 9:00 AM, Joe W2KJ wrote: Howdy Gang: Checked the KX3 manual but

Re: [Elecraft] Audio Output Impedance of the KX3

2017-01-23 Thread Jim Brown
On Mon,1/23/2017 9:22 AM, Walter Underwood wrote: For portable operation, I use Apple EarPods. Those are 45 Ohms. Don't worry about impedance of headphones. There is no need to match impedances in audio circuits. 73, Jim K9YC __

Re: [Elecraft] Audio Output Impedance of the KX3

2017-01-23 Thread Walter Underwood
For portable operation, I use Apple EarPods. Those are 45 Ohms. wunder K6WRU Walter Underwood CM87wj http://observer.wunderwood.org/ (my blog) > On Jan 23, 2017, at 9:07 AM, Walter Underwood wrote: > > I use Yamaha CM500 headphones and their specs say 120 Ohms. They work

Re: [Elecraft] Audio Output Impedance of the KX3

2017-01-23 Thread Walter Underwood
I use Yamaha CM500 headphones and their specs say 120 Ohms. They work fine. http://usa.yamaha.com/products/music-production/accessories/headphones/cm500/ wunder K6WRU Walter Underwood CM87wj

[Elecraft] Audio Output Impedance of the KX3

2017-01-23 Thread Joe W2KJ
Howdy Gang: Checked the KX3 manual but was unable to find the audio output impedance of the KX3, i.e., what impedance headphones/speaker should I be using on the rig? I’m looking to buy a lightweight headset for portable ops and want to know what impedance I should be looking for. Many thanks