Re: [Elecraft] KX3 Audio Power
Regarding the message below... I too have adjusted my KX3s RXEQ to enhance the audio frequency spectrum that is for voice (and CW) communications. Using my KX3 (and other radios like my collection of Heath QRP radios) in my ham shack I use West Mountain Radios Comm Speakers. They are advertised as RF proof... and I think they are right. Operating 200 watts doesn't interfere with the WMR speakers or I have no RFI in my shack- how likely is that? Oh yah, they sound pretty well with my KX3, HW7, HW8, HW9. See: http://www.westmountainradio.com/product_info.php?products_id=com_spkr I got mine at HRO. FWIW, Rich KR7W Message: 15 Date: Thu, 27 Mar 2014 22:47:18 -0700 From: Jim Brown To: elecraft@mailman.qth.net Subject: Re: [Elecraft] KX3 Audio Power Message-ID: <53350ce6.6060...@audiosystemsgroup.com> Content-Type: text/plain; charset=windows-1252; format=flowed On 3/27/2014 6:02 PM, Ross Primrose N4RP wrote: > Just use a pair of small amplified computer speakers Be careful about that -- most amplified loudspeakers have RFI problems. Remember that the KX3 is specifically designed to be a backpacking rig, so everything, including the audio amp, is designed to be stingy about using battery power. One simple thing we can do to maximize the audio output level is to use RXEQ to roll off the lower three bands. The sound in these lower bands makes no contribution to communications, but it does use power, so when we get rid of it, we can use the power for the sound that matters. 73, Jim K9YC __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] KX3 Audio Power
Come to think of it I have a JBL Micro Wireless speaker which is USB powered and has a 5 hr battery. Bluetooth to my iPad but also has an attached cable -- should work fine with the KX3. 73, Phil w7ox On 3/28/14, 9:25 AM, Reginald J Mackey SR wrote: i use sona verse usb powered speakers with my kx3. bought on amazon.com for a few bucks. perfect fit. Reggie k6xr On Mar 28, 2014, at 08:09 AM, Phil Wheeler wrote: Earphones make the most sense. If I need a speaker, I have a small Radio Shack speaker with an amp, powered by a 9 V. battery. However I've not tried it with my KX3 -- and I don't know if RS still has them. 73, Phil w7ox On 3/27/14, 6:02 PM, Ross Primrose N4RP wrote: > Just use a pair of small amplified computer > speakers... > > 73, Ross N4RP > __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] KX3 Audio Power
I've always been able to eliminate RFI in amplified computer speakers by wrapping as many turns as I can get of the audio and power leads around ferrite toroids. The problem I've had is that they sound awful, especially with CW. They tend to buzz at particular frequencies. Maybe I've just had bad luck with the ones I've tried. On 3/28/2014 10:56 AM, Doug Person wrote: This has been a significant problem for the powered speakers I have tried. Even the West Mountain Radio speakers that are supposed to be RF proof are not RF proof. I'm going to try a few of the single-ic audio chips to see I can produce enough clean audio while avoiding the RF feedback problem. Doug -- K0DXV On 3/27/2014 11:47 PM, Jim Brown wrote: On 3/27/2014 6:02 PM, Ross Primrose N4RP wrote: Just use a pair of small amplified computer speakers Be careful about that -- most amplified loudspeakers have RFI problems. Remember that the KX3 is specifically designed to be a backpacking rig, so everything, including the audio amp, is designed to be stingy about using battery power. One simple thing we can do to maximize the audio output level is to use RXEQ to roll off the lower three bands. The sound in these lower bands makes no contribution to communications, but it does use power, so when we get rid of it, we can use the power for the sound that matters. 73, Jim K9YC -- 73, Vic, K2VCO Fresno CA http://www.qsl.net/k2vco/ __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] KX3 Audio Power
i use sona verse usb powered speakers with my kx3. bought on amazon.com for a few bucks. perfect fit. Reggie k6xr On Mar 28, 2014, at 08:09 AM, Phil Wheeler wrote: Earphones make the most sense. If I need a speaker, I have a small Radio Shack speaker with an amp, powered by a 9 V. battery. However I've not tried it with my KX3 -- and I don't know if RS still has them. 73, Phil w7ox On 3/27/14, 6:02 PM, Ross Primrose N4RP wrote: > Just use a pair of small amplified computer > speakers... > > 73, Ross N4RP > __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to k...@icloud.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] KX3 Audio Power
This has been a significant problem for the powered speakers I have tried. Even the West Mountain Radio speakers that are supposed to be RF proof are not RF proof. I'm going to try a few of the single-ic audio chips to see I can produce enough clean audio while avoiding the RF feedback problem. Doug -- K0DXV On 3/27/2014 11:47 PM, Jim Brown wrote: On 3/27/2014 6:02 PM, Ross Primrose N4RP wrote: Just use a pair of small amplified computer speakers Be careful about that -- most amplified loudspeakers have RFI problems. Remember that the KX3 is specifically designed to be a backpacking rig, so everything, including the audio amp, is designed to be stingy about using battery power. One simple thing we can do to maximize the audio output level is to use RXEQ to roll off the lower three bands. The sound in these lower bands makes no contribution to communications, but it does use power, so when we get rid of it, we can use the power for the sound that matters. 73, Jim K9YC __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to k0...@aol.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] KX3 Audio Power
On 3/28/2014 8:25 AM, ejk...@gmail.com wrote: > I use a Dell computer powered speaker, it works great and can be powered > from 13.8 power supply used for the rig. I need an amplifier like that to connect my computer audio output to the speakers in my display/monitor. Anyone have any ideas? -- -- 73 de K2ASP - Phil Kane Elecraft K2/100 s/n 5402 >From a Clearing in the Silicon Forest Beaverton (Washington County) Oregon __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] KX3 Audio Power
Earphones make the most sense. If I need a speaker, I have a small Radio Shack speaker with an amp, powered by a 9 V. battery. However I've not tried it with my KX3 -- and I don't know if RS still has them. 73, Phil w7ox On 3/27/14, 6:02 PM, Ross Primrose N4RP wrote: Just use a pair of small amplified computer speakers... 73, Ross N4RP __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] KX3 Audio Power
Doug, I use a Dell computer powered speaker, it works great and can be powered from 13.8 power supply used for the rig. It has volume control, on/off, and earphone plug. No RF problems from K3 and KPA500 or other in shack rigs. Its Dell AX510 stereo sound bar, 34.99. Good luck 73 Emory WM3M -Original Message- From: Doug Person Sent: Thursday, March 27, 2014 8:46 PM To: elecraft@mailman.qth.net Subject: [Elecraft] KX3 Audio Power Now that the KX3 can function as a full QRO transceiver with the new amplifier, I find myself a bit disappointed with audio output power. Even with the most efficient speaker I can find, I can't really get a comfortable audio level. So, I'm kind of stuck with headphones to really hear well. Wondering if anyone has tried building a simple audio amp that will power a decent desk speaker. I was wondering if these class "D" modules are worth investigating. Anyone have any ideas? 73, Doug -- K0DXV __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to ejk...@gmail.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] KX3 Audio Power
The KX3 jack labeled "Phones" really is for headphones, it is spec'ed for 0.1W per channel. You will need an amplifier to drive speakers. wunder K6WRU On Mar 27, 2014, at 10:47 PM, Jim Brown wrote: > On 3/27/2014 6:02 PM, Ross Primrose N4RP wrote: >> Just use a pair of small amplified computer speakers > > Be careful about that -- most amplified loudspeakers have RFI problems. > > Remember that the KX3 is specifically designed to be a backpacking rig, so > everything, including the audio amp, is designed to be stingy about using > battery power. > > One simple thing we can do to maximize the audio output level is to use RXEQ > to roll off the lower three bands. The sound in these lower bands makes no > contribution to communications, but it does use power, so when we get rid of > it, we can use the power for the sound that matters. > > 73, Jim K9YC > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to wun...@wunderwood.org -- Walter Underwood wun...@wunderwood.org __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] KX3 Audio Power
On 3/27/2014 6:02 PM, Ross Primrose N4RP wrote: Just use a pair of small amplified computer speakers Be careful about that -- most amplified loudspeakers have RFI problems. Remember that the KX3 is specifically designed to be a backpacking rig, so everything, including the audio amp, is designed to be stingy about using battery power. One simple thing we can do to maximize the audio output level is to use RXEQ to roll off the lower three bands. The sound in these lower bands makes no contribution to communications, but it does use power, so when we get rid of it, we can use the power for the sound that matters. 73, Jim K9YC __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] KX3 Audio Power
Just use a pair of small amplified computer speakers... 73, Ross N4RP On 3/27/2014 8:46 PM, Doug Person wrote: Now that the KX3 can function as a full QRO transceiver with the new amplifier, I find myself a bit disappointed with audio output power. Even with the most efficient speaker I can find, I can't really get a comfortable audio level. So, I'm kind of stuck with headphones to really hear well. Wondering if anyone has tried building a simple audio amp that will power a decent desk speaker. I was wondering if these class "D" modules are worth investigating. Anyone have any ideas? 73, Doug -- K0DXV __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to n...@n4rp.com -- FCC Section 97.313(a) “At all times, an amateur station must use the minimum transmitter power necessary to carry out the desired communications.” __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
[Elecraft] KX3 Audio Power
Now that the KX3 can function as a full QRO transceiver with the new amplifier, I find myself a bit disappointed with audio output power. Even with the most efficient speaker I can find, I can't really get a comfortable audio level. So, I'm kind of stuck with headphones to really hear well. Wondering if anyone has tried building a simple audio amp that will power a decent desk speaker. I was wondering if these class "D" modules are worth investigating. Anyone have any ideas? 73, Doug -- K0DXV __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
