Dave Clark Microphone
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I have a query for the group. I am a pilot and have several Dave Clark H13.4 headsets with noise-cancelling electret microphones that terminate in a 3-wire connector. Can these microphones be configured to work with the K2?
Rob KC6ROC K2 #5924 in progress _______________________________________________ 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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Rob,
If you can tell us what the functions of 3 wires are, then we should be able to tell you how to connect it. Pure speculation tells me that one is AF, another is ground and the third may be either the voltage feed to the electret element or it may be the audio to the headphone section, or it could be a PTT wire - but that is strictly a guess based on my assumption of whatever might be included in the set of 3. In other words, a SWAG. If the element is truly an electret type, it will likely work with the K2 just fine. 73, Don W3FPR > -----Original Message----- > > I have a query for the group. I am a pilot and have several Dave > Clark H13.4 headsets with noise-cancelling electret microphones > that terminate in a 3-wire connector. Can these microphones be > configured to work with the K2? > Rob > KC6ROC K2 #5924 in progress > -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.441 / Virus Database: 268.18.3/699 - Release Date: 2/23/2007 1:26 PM _______________________________________________ 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 RBrigham1
Don,
I can tell you that the PTT function is not on the headset, and the audio input to the headset (150 ohm impedence) is on another plug which I have already sorted out. I guess I will have to dig up a schematic from somehwere. Thanks, Rob KC6ROC K2 #5924 in progress "Don Wilhelm" <[hidden email]> wrote: >Rob, > >If you can tell us what the functions of 3 wires are, then we should be able >to tell you how to connect it. >Pure speculation tells me that one is AF, another is ground and the third >may be either the voltage feed to the electret element or it may be the >audio to the headphone section, or it could be a PTT wire - but that is >strictly a guess based on my assumption of whatever might be included in the >set of 3. In other words, a SWAG. > >If the element is truly an electret type, it will likely work with the K2 >just fine. > >73, >Don W3FPR > >> -----Original Message----- >> >> I have a query for the group. I am a pilot and have several Dave >> Clark H13.4 headsets with noise-cancelling electret microphones >> that terminate in a 3-wire connector. Can these microphones be >> configured to work with the K2? >> Rob >> KC6ROC K2 #5924 in progress >> >-- >No virus found in this outgoing message. >Checked by AVG Free Edition. >Version: 7.5.441 / Virus Database: 268.18.3/699 - Release Date: 2/23/2007 >1:26 PM > >_______________________________________________ >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 |
Re: Dave Clark Microphone
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In reply to this post by Don Wilhelm-3
Rob
The David Clark aircraft headset or any mike for aircraft use are designed to work the same as carbon mikes. The pin out is sleeve ground, Ring mike audio, and Tip key. They use the carbon mike bias to power an internal amplifier. the output is way to high for use with a ham rig of any kind. Ex aircraft electronic systems engineer. Roger Steyaert, K7RXV Don Wilhelm wrote: > Rob, > > If you can tell us what the functions of 3 wires are, then we should be able > to tell you how to connect it. > Pure speculation tells me that one is AF, another is ground and the third > may be either the voltage feed to the electret element or it may be the > audio to the headphone section, or it could be a PTT wire - but that is > strictly a guess based on my assumption of whatever might be included in the > set of 3. In other words, a SWAG. > > If the element is truly an electret type, it will likely work with the K2 > just fine. > > 73, > Don W3FPR > >> -----Original Message----- >> >> I have a query for the group. I am a pilot and have several Dave >> Clark H13.4 headsets with noise-cancelling electret microphones >> that terminate in a 3-wire connector. Can these microphones be >> configured to work with the K2? >> Rob >> KC6ROC K2 #5924 in progress >> > -- > No virus found in this outgoing message. > Checked by AVG Free Edition. > Version: 7.5.441 / Virus Database: 268.18.3/699 - Release Date: 2/23/2007 > 1:26 PM > > _______________________________________________ > 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 Don Wilhelm-3
All aircraft mikes are carbon-equivalent, irrespective of the technology
inside the microphone. So, the mike is a two wire device, one side to ground, and the hot side wants to see a resistor on the order of 560 to 1000 ohms to a clean (quiet) source of 8 to 12 volts. The audio, which will be fairly high level, is taken through a DC blocking capacitor from the hot side of the mike. It is terminated in a three wire phone plug, but one of those is the PTT function, which will not have a connection in the headset. From memory, mike hot is the tip, PTT is the ring, and ground is the sleeve. --- Graham == Don Wilhelm wrote: > Rob, > > If you can tell us what the functions of 3 wires are, then we should be able > to tell you how to connect it. > Pure speculation tells me that one is AF, another is ground and the third > may be either the voltage feed to the electret element or it may be the > audio to the headphone section, or it could be a PTT wire - but that is > strictly a guess based on my assumption of whatever might be included in the > set of 3. In other words, a SWAG. > > If the element is truly an electret type, it will likely work with the K2 > just fine. > > 73, > Don W3FPR > > >> -----Original Message----- >> >> I have a query for the group. I am a pilot and have several Dave >> Clark H13.4 headsets with noise-cancelling electret microphones >> that terminate in a 3-wire connector. Can these microphones be >> configured to work with the K2? >> Rob >> KC6ROC K2 #5924 in progress >> >> > -- > No virus found in this outgoing message. > Checked by AVG Free Edition. > Version: 7.5.441 / Virus Database: 268.18.3/699 - Release Date: 2/23/2007 > 1:26 PM > > _______________________________________________ > 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 RBrigham1
Here's the explo and schematic for the H10-13.4 ...
http://www.davidclark.com/PDFFiles/PL19515P-39.pdf 73, Ken Rice K3VV Coopersburg, PA _______________________________________________ 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 RBrigham1
In a message dated 2/25/2007 3:46:15 AM Pacific Standard Time,
[hidden email] writes: > Here's the explo and schematic for the H10-13.4 ... > > http://www.davidclark.com/PDFFiles/PL19515P-39.pdf > > 73, > Ken Rice > K3VV > Coopersburg, PA Ken, Perfect! That's just what I was looking for. Thanks, 73 Rob KC6ROC K2 #5924 in progress _______________________________________________ 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 RBrigham1
As others have mentioned, the M-7A electret's output will be too high
for good performance on the K2 (400mV RMS ±6dB into 150 ohm load @ 1kHz for 114dB SPL input), so you'll need to pad it down. And you'll need a series 1uF capacitor (again, as others have mentioned). Jim, W6JVE, uses an aviation headset on the K2 with the Radio Shack 1000:8 ohm transformer: http://www.ac6rm.net/mailarchive/html/elecraft-list/2003-02/msg00306.html If you don't care about keeping the Clark headset in stock form, you can replace the M-7A element with the three-dollar Radio Shack electret element that will work with the DC voltage and expected mic output level at the K2's mic jack. http://www.ac6rm.net/mailarchive/html/elecraft-list/2004-01/msg00197.html Please let us know how it works out. _______________________________________________ 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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Of course the K2 includes a microphone input level attenuator selected via
the MENU. I believe it's 10 dB as supplied. The resistor values can be changed for a higher value, if needed. Ron AC7AC -----Original Message----- From: [hidden email] [mailto:[hidden email]] On Behalf Of Ken Rice Sent: Sunday, February 25, 2007 10:05 AM To: [hidden email] Subject: Re: [Elecraft] Dave Clark Microphone As others have mentioned, the M-7A electret's output will be too high for good performance on the K2 (400mV RMS ±6dB into 150 ohm load @ 1kHz for 114dB SPL input), so you'll need to pad it down. And you'll need a series 1uF capacitor (again, as others have mentioned). Jim, W6JVE, uses an aviation headset on the K2 with the Radio Shack 1000:8 ohm transformer: http://www.ac6rm.net/mailarchive/html/elecraft-list/2003-02/msg00306.html If you don't care about keeping the Clark headset in stock form, you can replace the M-7A element with the three-dollar Radio Shack electret element that will work with the DC voltage and expected mic output level at the K2's mic jack. http://www.ac6rm.net/mailarchive/html/elecraft-list/2004-01/msg00197.html Please let us know how it works out. _______________________________________________ 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 RBrigham1
In a message dated 2/25/2007 10:05:17 AM Pacific Standard Time,
[hidden email] writes: > As others have mentioned, the M-7A electret's output will be too high > for good performance on the K2 (400mV RMS ±6dB into 150 ohm load @ > 1kHz for 114dB SPL input), so you'll need to pad it down. And you'll > need a series 1uF capacitor (again, as others have mentioned). > > Jim, W6JVE, uses an aviation headset on the K2 with the Radio Shack > 1000:8 ohm transformer: > > > http://www.ac6rm.net/mailarchive/html/elecraft-list/2003-02/msg00306.html > > If you don't care about keeping the Clark headset in stock form, you > can replace the M-7A element with the three-dollar Radio Shack > electret element that will work with the DC voltage and expected mic > output level at the K2's mic jack. > > > http://www.ac6rm.net/mailarchive/html/elecraft-list/2004-01/msg00197.html > > Please let us know how it works out. headphone impedence from 150 ohms to about 8 ohms, so I was planning to add a few more parts to it to handle the mic. Thanks for interest and info and I will definitely let the group know how it turns out. But first, I have to finish my K2. I have completed the Stage 1 checks successfully and am in the middle of populating the RF board. Stay tuned... Rob KC6ROC K2 #5924 _______________________________________________ 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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