KX2 speaker/headphone question
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KX2 speaker/headphone question
 
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Hi folks. I need some assistance. Is the KX2's headset jack "padded"
to protect hearing? I'm asking because I built the "CW Resonant Speaker" in the current QST and it works great but the volume is so low that it's unusable. Do I have to take the speaker output directly off the KX2's speaker terminals to get more volume? Thanks and 73, Stan WB2LQF Sorry for the bum post; fat fingers!! ______________________________________________________________ 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 Message delivered to [hidden email] |
Re: KX2 speaker/headphone question
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G'day,
CW resonant speaker ? - does it have a filter in it ? If the frequency is significantly different to the KX2's filter it would explain the extremely low volume. 73's Peter VK4JD -----Original Message----- From: Elecraft [mailto:[hidden email]] On Behalf Of stan levandowski Sent: Tuesday, 7 February 2017 11:48 AM To: [hidden email] Subject: [Elecraft] KX2 speaker/headphone question Hi folks. I need some assistance. Is the KX2's headset jack "padded" to protect hearing? I'm asking because I built the "CW Resonant Speaker" in the current QST and it works great but the volume is so low that it's unusable. Do I have to take the speaker output directly off the KX2's speaker terminals to get more volume? Thanks and 73, Stan WB2LQF Sorry for the bum post; fat fingers!! ______________________________________________________________ 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 Message delivered to [hidden email] ______________________________________________________________ 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 Message delivered to [hidden email] |
Re: KX2 speaker/headphone question
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No,Peter, it "acts" like a filter to focus on CW frequencies between
approx 500 to 700 Hz while downplaying higher frequency noise. Good stuff available via Google and Youtube and page 43 of current QST 73, Stan WB2LQF On Mon, Feb 06, 2017 at 09:01 PM, Peter Lambert wrote: > G'day, > > CW resonant speaker ? - does it have a filter in it ? > > If the frequency is significantly different to the KX2's filter it > would explain the extremely low volume. > > 73's Peter VK4JD > > -----Original Message----- > From: Elecraft [mailto:[hidden email]] On Behalf Of > stan levandowski > Sent: Tuesday, 7 February 2017 11:48 AM > To: [hidden email] > Subject: [Elecraft] KX2 speaker/headphone question > > Hi folks. I need some assistance. Is the KX2's headset jack "padded" > to protect hearing? > > I'm asking because I built the "CW Resonant Speaker" in the current > QST and it works great but the volume is so low that it's unusable. > > > Do I have to take the speaker output directly off the KX2's speaker > terminals to get more volume? > > > Thanks and 73, > Stan WB2LQF > > > Sorry for the bum post; fat fingers!! > ______________________________________________________________ > 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 > Message delivered to [hidden email] > > 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 Message delivered to [hidden email] |
Re: KX2 speaker/headphone question
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In reply to this post by stan levandowski
Nice speaker but unfortunately won't help me out here. I need mono
output for this speaker and it's only 2 inches and 8 ohms. If I could get the volume from the headphone jack that I get from the KX2 speaker, I'd be quite satisfied. Stan WB2LQF On Mon, Feb 06, 2017 at 08:55 PM, Walter Underwood wrote: > I use this audio amp to drive speakers from my KX3. It is 15 W per > channel stereo, runs off 12 V, and costs under $9. > > https://smile.amazon.com/gp/product/B00C4MT274/ > wunder > K6WRU > Walter Underwood > CM87wj > http://observer.wunderwood.org/ (my blog) > >> On Feb 6, 2017, at 5:47 PM, stan levandowski wrote: >> >> Hi folks. I need some assistance. Is the KX2's headset jack >> "padded" to protect hearing? >> >> I'm asking because I built the "CW Resonant Speaker" in the current >> QST and it works great but the volume is so low that it's unusable. >> >> >> Do I have to take the speaker output directly off the KX2's speaker >> terminals to get more volume? >> >> >> Thanks and 73, >> Stan WB2LQF >> >> >> Sorry for the bum post; fat fingers!! >> ______________________________________________________________ >> 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 >> Message delivered to [hidden email] > > ______________________________________________________________ > 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 > Message delivered to [hidden email] > 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 Message delivered to [hidden email] |
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In reply to this post by stan levandowski
In answer to a list member question ... the speaker is acoustically
resonant and -very- narrow. I suspect Stan's build and his KX2's filtered output tone are too far apart. I have two of the original speakers and they are phenomenal! 73 Ken - K0PP On Feb 6, 2017 19:07, "stan levandowski" <[hidden email]> wrote: > No,Peter, it "acts" like a filter to focus on CW frequencies between > approx 500 to 700 Hz while downplaying higher frequency noise. Good stuff > available via Google and Youtube and page 43 of current QST > 73, Stan WB2LQF > > > On Mon, Feb 06, 2017 at 09:01 PM, Peter Lambert wrote: > > G'day, >> >> CW resonant speaker ? - does it have a filter in it ? >> >> If the frequency is significantly different to the KX2's filter it would >> explain the extremely low volume. >> >> 73's Peter VK4JD >> >> -----Original Message----- >> From: Elecraft [mailto:[hidden email]] On Behalf Of >> stan levandowski >> Sent: Tuesday, 7 February 2017 11:48 AM >> To: [hidden email] >> Subject: [Elecraft] KX2 speaker/headphone question >> >> Hi folks. I need some assistance. Is the KX2's headset jack "padded" to >> protect hearing? >> >> I'm asking because I built the "CW Resonant Speaker" in the current QST >> and it works great but the volume is so low that it's unusable. >> >> >> Do I have to take the speaker output directly off the KX2's speaker >> terminals to get more volume? >> >> >> Thanks and 73, >> Stan WB2LQF >> >> >> Sorry for the bum post; fat fingers!! >> ______________________________________________________________ >> 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 >> Message delivered to [hidden email] >> >> >> ______________________________________________________________ > 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 > Message delivered to [hidden email] 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 Message delivered to [hidden email] |
Re: KX2 speaker/headphone question
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Ken, "...two of the original speakers..." means you built them or Bill built them for you or you mean the "original" Sky-Tec? I've tried it with the KX2 filter set all the way to 2.8. Also tried it with my KX1 and the same low volume. I don't understand this term "padding" but it was suggested to me in a post on the CW list that "most modern transceiver have headset outputs that are padded to protect hearing" and I thought that might have something to do with this low volume. I really want to experience this phenomenal sound I've heard so much about!!! 73, Stan WB2LQF On Mon, Feb 06, 2017 at 09:18 PM, Rose wrote: In answer to a list member question ... the speaker is acoustically resonant and -very- narrow. I suspect Stan's build and his KX2's filtered output tone are too far apart. I have two of the original speakers and they are phenomenal! 73 Ken - K0PP On Feb 6, 2017 19:07, "stan levandowski" <[hidden email] <mailto:[hidden email]> > wrote: No,Peter, it "acts" like a filter to focus on CW frequencies between approx 500 to 700 Hz while downplaying higher frequency noise. Good stuff available via Google and Youtube and page 43 of current QST 73, Stan WB2LQF On Mon, Feb 06, 2017 at 09:01 PM, Peter Lambert wrote: G'day, CW resonant speaker ? - does it have a filter in it ? If the frequency is significantly different to the KX2's filter it would explain the extremely low volume. 73's Peter VK4JD -----Original Message----- From: Elecraft [mailto:[hidden email] <mailto:[hidden email]> ] On Behalf Of stan levandowski Sent: Tuesday, 7 February 2017 11:48 AM To: [hidden email] <mailto:[hidden email]> Subject: [Elecraft] KX2 speaker/headphone question Hi folks. I need some assistance. Is the KX2's headset jack "padded" to protect hearing? I'm asking because I built the "CW Resonant Speaker" in the current QST and it works great but the volume is so low that it's unusable. Do I have to take the speaker output directly off the KX2's speaker terminals to get more volume? Thanks and 73, Stan WB2LQF Sorry for the bum post; fat fingers!! ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft <http://mailman.qth.net/mailman/listinfo/elecraft> Help: http://mailman.qth.net/mmfaq.htm <http://mailman.qth.net/mmfaq.htm> Post: mailto:[hidden email] <mailto:[hidden email]> This list hosted by: http://www.qsl.net <http://www.qsl.net> Please help support this email list: http://www.qsl.net/donate.html <http://www.qsl.net/donate.html> Message delivered to [hidden email] <mailto:[hidden email]> ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft <http://mailman.qth.net/mailman/listinfo/elecraft> Help: http://mailman.qth.net/mmfaq.htm <http://mailman.qth.net/mmfaq.htm> Post: mailto:[hidden email] <mailto:[hidden email]> This list hosted by: http://www.qsl.net <http://www.qsl.net> Please help support this email list: http://www.qsl.net/donate.html <http://www.qsl.net/donate.html> Message delivered to [hidden email] <mailto:[hidden email]> ______________________________________________________________ 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 Message delivered to [hidden email] |
Re: KX2 speaker/headphone question
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In reply to this post by stan levandowski
Stan,
One of your big problems is that the speaker specified in that project is 8 ohms - if you can find a 4 ohm speaker, you will almost quadruple the available audio. The other solution is to use an amplifier. 73, Don W3FPR On 2/6/2017 8:47 PM, stan levandowski wrote: > Hi folks. I need some assistance. Is the KX2's headset jack "padded" > to protect hearing? > > I'm asking because I built the "CW Resonant Speaker" in the current QST > and it works great but the volume is so low that it's unusable. ______________________________________________________________ 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 Message delivered to [hidden email] |
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In reply to this post by stan levandowski
I think that speaker is very sharp so the frequency of the audio sidetone must be very exact.
Sent from my iPhone ...nr4c. bill > On Feb 6, 2017, at 9:05 PM, stan levandowski <[hidden email]> wrote: > > No,Peter, it "acts" like a filter to focus on CW frequencies between approx 500 to 700 Hz while downplaying higher frequency noise. Good stuff available via Google and Youtube and page 43 of current QST > 73, Stan WB2LQF > > >> On Mon, Feb 06, 2017 at 09:01 PM, Peter Lambert wrote: >> >> G'day, >> >> CW resonant speaker ? - does it have a filter in it ? >> >> If the frequency is significantly different to the KX2's filter it would explain the extremely low volume. >> >> 73's Peter VK4JD >> >> -----Original Message----- >> From: Elecraft [mailto:[hidden email]] On Behalf Of stan levandowski >> Sent: Tuesday, 7 February 2017 11:48 AM >> To: [hidden email] >> Subject: [Elecraft] KX2 speaker/headphone question >> >> Hi folks. I need some assistance. Is the KX2's headset jack "padded" to protect hearing? >> >> I'm asking because I built the "CW Resonant Speaker" in the current QST and it works great but the volume is so low that it's unusable. >> >> >> Do I have to take the speaker output directly off the KX2's speaker terminals to get more volume? >> >> >> Thanks and 73, >> Stan WB2LQF >> >> >> Sorry for the bum post; fat fingers!! >> ______________________________________________________________ >> 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 >> Message delivered to [hidden email] >> >> > ______________________________________________________________ > 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 > Message delivered to [hidden email] ______________________________________________________________ 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 Message delivered to [hidden email] |
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In reply to this post by stan levandowski
Adjust the sidetone to find exact frequency. It's very sharp and might only work if freq is exact.
Sent from my iPhone ...nr4c. bill > On Feb 6, 2017, at 9:08 PM, stan levandowski <[hidden email]> wrote: > > Nice speaker but unfortunately won't help me out here.  I need mono output for this speaker and it's only 2 inches and 8 ohms.  If I could get the volume from the headphone jack that I get from the KX2 speaker, I'd be quite satisfied.  Stan WB2LQF > > >> On Mon, Feb 06, 2017 at 08:55 PM, Walter Underwood wrote: >> >> I use this audio amp to drive speakers from my KX3. It is 15 W per channel stereo, runs off 12 V, and costs under $9. >> >> https://smile.amazon.com/gp/product/B00C4MT274/ >> wunder >> K6WRU >> Walter Underwood >> CM87wj >> http://observer.wunderwood.org/ (my blog) >> >>> On Feb 6, 2017, at 5:47 PM, stan levandowski wrote: >>> >>> Hi folks. I need some assistance. Is the KX2's headset jack "padded" to protect hearing? >>> >>> I'm asking because I built the "CW Resonant Speaker" in the current QST and it works great but the volume is so low that it's unusable. >>> >>> >>> Do I have to take the speaker output directly off the KX2's speaker terminals to get more volume? >>> >>> >>> Thanks and 73, >>> Stan WB2LQF >>> >>> >>> Sorry for the bum post; fat fingers!! >>> ______________________________________________________________ >>> 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 >>> Message delivered to [hidden email] >> >> ______________________________________________________________ >> 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 >> Message delivered to [hidden email] >> > ______________________________________________________________ > 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 > Message delivered to [hidden email]šXÙH ÜXZÙ\ˆ] [™›Ü [˜][ H ÛÛ‰Ý[ YHÝ]\™Kˆ0¨H™YY[ۛțÝ] ]›Üˆ \È ÜXZÙ\ˆ[™] ÜÈÛ› H ˆ[˜Ú\È[™Ú\ˈ0¨YˆHÛÝ[™Ù] H ›Û [YHœ›ÛH HXY Û™H˜XÚÈ ]HÙ]œ›ÛH HÖ ˆ ÜXZÙ\‹’IÙ™H ]Z]H Ø]\ÙšYY ˆ0¨Ý[ˆÐŒ“Q‚‚‚“Ûˆ[Û‹™Xˆ > ‹ Œ MÈ] MHKØ[ \ˆ[™\ÛÛÙ Ü›ÝN‚‚ˆH \ÙH \È]Y[È[\ È š]™H ÜXZÙ\œÈœ›ÛH^HÖ Ëˆ]\È MHÈ \ˆˆÚ[›™[ Ý\™[Ë [œÈÙ™ˆ Lˆ‹[™ÛÜÝ È [™\ˆ K‚‚ˆ ΋ËÜÛZ[K˜[X^›Û‹˜ÛÛKÙÜ Ü ›Ù XÝ ÐŒ ÍU Í Âˆ Ý[™\‚ˆÍ•Ô•BˆØ[ \ˆ[™\ÛÛÙˆÓN > ÝÚ‚ˆ ‹ËÛØœÙ\™\‹Ý[™\ÛÛÙ ›Ü™ËÈ > ^H›ÙÊB‚ˆÛˆ™Xˆ > ‹ Œ MË] > N > ÈK Ý[ˆ]˜[™ÝÜÚÚH Ü›ÝN‚‚ˆH›ÛÜˈH™YY ÛÛYH\ÜÚ\Ý[˜ÙKˆ\È HÖ ‰ÜÈXY Ù]˜XÚȈœYYˆ È ›ÝXÝX\š[™Ï‚ˆIÛH\ÚÚ[™È™XØ]\ÙHHZ[ HÕÈ™\ÛÛ˜[ÜXZÙ\ˆˆ[ˆ HÝ\œ™[ˆTÕ[™] ÛÜšÜÈÜ™X]] H ›Û [YH\È ÛÈÝÈ ]] ÜÈ [\ØX›K‚‚‚ˆÈH]™H È ZÙH H ÜXZÙ\ˆÝ] ]\™XÝ HÙ™ˆ HÖ ‰ÜÈ ÜXZÙ\ˆˆ \›Z[˜[ È ÈÙ][Ü™H ›Û [YO‚‚ˆ[šÜÈ[™ > ÌˈÝ[ˆÐŒ“Q‚‚‚ˆÛÜœžH›Üˆ H[H ÜÝȘ]š[™Ù\œÈHBˆ××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××׈[XܘYXZ[[™È\݈ÛYNˆ ‹ËÛXZ[X[‹œ] ›™] ÛXZ[X[‹Û\Ý[™›ËÙ[XܘYˆ[ ˆ ‹ËÛXZ[X[‹œ] ›™] Û[Y˜\Kš BˆÜ݈XZ[ Α[XܘYXZ[X[‹œ] ›™]‚ˆ\È\ÝÜÝYžNˆ ‹ËÝÝÝËœ\Û ›™]ˆX\ÙH[ Ý\ Ü \È[XZ[\݈ ‹ËÝÝÝËœ\Û ›™] ÙÛ˜]Kš [ˆY\ÜØYÙH[]™\™Y È Ý[™\ Ý[™\ÛÛÙ ›Ü™Â‚ˆ××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××׈[XܘYXZ[[™È\݈ÛYNˆ ‹ËÛXZ[X[‹œ] ›™] ÛXZ[X[‹Û\Ý[™›ËÙ[XܘYˆ[ ˆ ‹ËÛXZ[X[‹œ] ›™] Û[Y˜\Kš BˆÜ݈XZ[ Α[XܘYXZ[X[‹œ] ›™]‚ˆ\È\ÝÜÝYžNˆ ‹ËÝÝÝËœ\Û ›™]ˆX\ÙH[ Ý\ Ü \È[XZ[\݈ ‹ËÝÝÝËœ\Û ›™] ÙÛ˜]Kš [ˆY\ÜØYÙH[]™\™Y È Ú› ŒNPÜ Û›[™K›™]‚—××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××ב[XܘYXZ[[™È\Ý’ÛYNˆ ‹ËÛXZ[X[‹œ] ›™] ÛXZ[X[‹Û\Ý[™›ËÙ[XܘY’[ ˆ ‹ËÛXZ[X[‹œ] ›™] Û[Y˜\Kš B”Ü݈XZ[ Α[XܘYXZ[X[‹œ] ›™]‚•\È\ÝÜÝYžNˆ ‹ËÝÝÝËœ\Û ›™]”X\ÙH[ Ý\ Ü \È[XZ[\݈ ‹ËÝÝÝËœ\Û ›™] ÙÛ˜]Kš [“Y\ÜØYÙH[]™\™Y ȜРÚYÛXZÙ\‹˜ÛÛ ______________________________________________________________ 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 Message delivered to [hidden email] |
Re: KX2 speaker/headphone question
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In reply to this post by stan levandowski
Stan,
If you refer to the KX2 Block Diagram (Page 62 of my manual) you will see that the PH (headphone) takeoff is a low level and the SPKR(speaker) output has an additional amplifier associated with it. I think Wayne did this to minimize the current drain when using headphones, while providing usable speaker volume for fixed/station powered use. Plugging a resonant speaker without an amplifier into the headphone jack will result in the low volume that you are seeing. At least that's the way I understand the design. If you want viable, fixed KX2 operation, use a follow-on amplifier with the resonant speaker. 73, Brian, K0DTJ On 2/6/2017 17:47, stan levandowski wrote: > Hi folks. I need some assistance. Is the KX2's headset jack "padded" > to protect hearing? > > I'm asking because I built the "CW Resonant Speaker" in the current > QST and it works great but the volume is so low that it's unusable. > > > Do I have to take the speaker output directly off the KX2's speaker > terminals to get more volume? > ______________________________________________________________ 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 Message delivered to [hidden email] |
Re: KX2 speaker/headphone question
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Bingo. That makes sense. I've already sketched out a little 386 amp I
can build on a popsicle stick and tomorrow I'll dump my junkbox out on the kitchen table and go to work. I guess I should start looking at the manual before I bother people!! BTW, other than the volume problem I have, this little sucker REALLY makes the CW pop. And yes, it IS sharp. If I'm not right on, my sidetone disappears! 73, Stan WB2LQF On Mon, Feb 06, 2017 at 10:11 PM, Brian Hunt wrote: > Stan, > If you refer to the KX2 Block Diagram (Page 62 of my manual) you will > see that the PH (headphone) takeoff is a low level and the > SPKR(speaker) output has an additional amplifier associated with it. > I think Wayne did this to minimize the current drain when using > headphones, while providing usable speaker volume for fixed/station > powered use. Plugging a resonant speaker without an amplifier into > the headphone jack will result in the low volume that you are seeing. > > At least that's the way I understand the design. If you want viable, > fixed KX2 operation, use a follow-on amplifier with the resonant > speaker. > > 73, > Brian, K0DTJ > > On 2/6/2017 17:47, stan levandowski wrote: >> Hi folks. I need some assistance. Is the KX2's headset jack >> "padded" to protect hearing? >> >> I'm asking because I built the "CW Resonant Speaker" in the current >> QST and it works great but the volume is so low that it's unusable. >> >> >> Do I have to take the speaker output directly off the KX2's speaker >> terminals to get more volume? >> > > ______________________________________________________________ > 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 > Message delivered to [hidden email] > 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 Message delivered to [hidden email] |
Re: KX2 speaker/headphone question
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In reply to this post by Don Wilhelm
I didn't know it made that much difference, Don. My headset is a much
higher impedance and I have plenty of audio with it. Must be something I don't understand here. Too late to change the speaker; it's all glued in. I'll take the amp route. On Mon, Feb 06, 2017 at 09:35 PM, Don Wilhelm wrote: > Stan, > > One of your big problems is that the speaker specified in that project > is 8 ohms - if you can find a 4 ohm speaker, you will almost quadruple > the available audio. > > The other solution is to use an amplifier. > > 73, > Don W3FPR > > > On 2/6/2017 8:47 PM, stan levandowski wrote: >> Hi folks. I need some assistance. Is the KX2's headset jack >> "padded" >> to protect hearing? >> >> I'm asking because I built the "CW Resonant Speaker" in the current >> QST >> and it works great but the volume is so low that it's unusable. > 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 Message delivered to [hidden email] |
Re: KX2 speaker/headphone question
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In reply to this post by Don Wilhelm
On Mon,2/6/2017 6:35 PM, Don Wilhelm wrote:
> One of your big problems is that the speaker specified in that project > is 8 ohms - if you can find a 4 ohm speaker, you will almost quadruple > the available audio. Not quite. A loudspeaker amplifier is essentially a constant voltage source. If the two speakers have the same efficiency, the 4 ohm speaker will be 3 dB louder. But all speakers do NOT have the same efficiency, and Elecraft has been good at choosing small speakers with high efficiency for their size. That speaker in QST is a cute idea and demonstrates the principle of an acoustic filter. That's the value of it. The KX2 and KX3 are carefully designed to maximize battery life for portable operation. Part of that careful design is to limit the current in the audio output stage. It's really designed for headphones, or with external amplified loudspeakers. BTW -- I think the original question about the output being "padded" is a reference to a passive attenuator -- a resistive voltage divider. In the audio and broadcast world, components or networks like this are called a "pad." No, the output of these radios are not padded in that sense, but it is good practice to add a small resistor in series with the output of any audio power amp that connects to a jack, so that it's less likely to be damaged when a jack is partially inserted and shorts the output. :) 73, Jim 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 Message delivered to [hidden email] |
Re: KX2 speaker/headphone question
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In reply to this post by stan levandowski
Hi Ron,
Stan was asking about the KX2 which to my knowledge has no 2M/4/M module available. Wish it did :-). None the less a spectacular rig. Cheers, Glen VK1FB On Wednesday, February 8, 2017, Ron D'Eau Claire <[hidden email]> wrote: > To answer your question, there are 10 ohm resistors in the phones line - > one in each channel. So you are losing more than half the audio power in > the resistors. (On the plus side, you'll still have an audio output working > even if you accidentally short the audio to ground!) > > If you are not using the 2M/4M module for VHF you might be able to install > a miniature jack for an external speaker. If you do not use the internal > speaker at all, you might just unplug it and connect direct to the speaker > connector near the internal speaker. > > Acoustical filters like that work very well. That one looks quite short. > I'm used to seeing a smaller diameter and longer pipe. I had one that was > driven by a single headphone and produced plenty of volume for a room with > my old rx, but that was back in vacuum tube days when receives typically > pumped out a watt or more of audio. > > 73, Ron AC7AC > > > > > -----Original Message----- > From: Elecraft [mailto:[hidden email] <javascript:;>] > On Behalf Of stan levandowski > Sent: Monday, February 6, 2017 6:09 PM > To: Walter Underwood > Cc: [hidden email] <javascript:;> > Subject: Re: [Elecraft] KX2 speaker/headphone question > > Nice speaker but unfortunately won't help me out here. I need mono output > for this speaker and it's only 2 inches and 8 ohms. If I could get the > volume from the headphone jack that I get from the KX2 speaker, I'd be > quite satisfied. Stan WB2LQF > > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] <javascript:;> > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [hidden email] <javascript:;> > 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 Message delivered to [hidden email] |
Re: KX2 speaker/headphone question
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In reply to this post by stan levandowski
That's the good engineering practice to protect the output stage from
shorts. In that situation, 8 ohms will get more power than 4 ohms. It's the classic "maximum power transfer theorem," where, when the LOAD is variable, you get max power when the load Z is equal to the source Z. So it comes down to which speaker is more efficient. 73, Jim K9YC On Tue,2/7/2017 6:52 PM, Ron D'Eau Claire wrote: > To answer your question, there are 10 ohm resistors in the phones line - one in each channel. So you are losing more than half the audio power in the resistors. (On the plus side, you'll still have an audio output working even if you accidentally short the audio to ground!) ______________________________________________________________ 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 Message delivered to [hidden email] |
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