Using Lith-Ion batteries in the KX-1
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Using Lith-Ion batteries in the KX-1
 
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I have just uploaded a video to YouTube that explains how I use Lith-Ion batteries in the KX-1 for more voltage than Alkalines, and thus more RJ output.
http://www.youtube.com/watch?v=HFyIWrzE0BE&feature=youtu.be Howard K4LXY Photo gallery: www.howardzehr.com Blog: http://emu.edu/blog/restorative-justice/ FORTHCOMING BOOK (May 2013): Pickups: A Love Story - Pickups, Their Owners, Their Stories (Good Books) http://goodbooks.com/book/9781561487882-pickups--a-love-story-hardcover-with-dustjacket#.UQKcd6WwqX8 ______________________________________________________________ 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 |
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I have a friend who is getting two D104 mics. One is an amplified mic (9 volt battery in the bottom), and the other is not. Will they both work with the K3/0? Do any changes need to be made in the MENU settings? He will be using them to remote into my K3/100.
Any suggestions would be greatly appreciated. 73, Steve K6SAB ______________________________________________________________ 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 |
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Steve,
The amplified D-104 should work just fine as long as the gain potentiometer is set correctly. The K3 ALc display should be helpful in arriving at a setting that will work with the K3 mic gain set for a mid-setting. The answer for the unamplified D-104 is "it all depends". The frequency response of the D-104 crystal or ceramic mic elements depends on the load resistance, and the design response needs a 50k to 500k load resistance - the K3 provides a nominal 600 ohm impedance, so the D-104 will sound 'tinny' if connected directly. There are those who say that a series 100k resistor in the AF line is all that is needed, but I have not tried that. The D-104 microphone that I use has an FET in the base with a 470k resistor across the gate to load the microphone and a sufficiently low output impedance to provide a good mic gain range for the K3. 73, Don W3FPR On 10/7/2013 7:15 PM, Steven Bertsch wrote: > I have a friend who is getting two D104 mics. One is an amplified mic (9 volt battery in the bottom), and the other is not. Will they both work with the K3/0? Do any changes need to be made in the MENU settings? He will be using them to remote into my K3/100. > > Any suggestions would be greatly appreciated. > > ______________________________________________________________ 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 |
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In reply to this post by Steven Bertsch
The basic D-104 (without amplifier) is a crystal microphone, designed
for very high impedance (>100K ohm), and delivering fairly high output voltage. It worked well with the vacuum tube amplifiers used when the D-104 was new. The K3 (and other modern rigs) have much lower input impedance and will load down the crystal mic element considerably. There were several amplified versions, the "power mikes" of the CB craze. These have low output impedance (a few K ohms, varies with the output level pot setting) combined with high output voltage. Their output level can over-drive radios designed for dynamic microphones unless the gain setting is kept very low, or an attenuator is placed in the output. Links: Adapting D-104 to modern radios (using an op-amp buffer) <http://www.w6ier.org/images/9908034%5B1%5DAdapting%20the%20Astatic%20D104%20Mic.pdf> Schematics for amplified Astatic mics <http://www.barovelli.com/projects/radio/radioastatic.htm> ______________________________________________________________ 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 |
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The unamplified D104 has been a subject of discussion here on several occasions. The easiest, least cost way to use one with the K3 (and Icom transceivers) is described in this three year old posting by W9AC: > Last night, I built up the following D104 buffer circuit as discussed by > Joe, W4TV. > > http://72.52.250.47/images/D104.jpg > http://72.52.250.47/images/D104.pdf > > Joe's idea works very well. The difference between this circuit and other > D104 buffer circuits as seen on the Internet is that it is powered directly > from the K3's mic lead when the bias menu is activated. One benefit is that > the circuit can be ported to a PC sound card. Another benefit for most > builders: Only one part is required -- either a J201 or MPF-102 nFET > transistor. When using the PC input configuration shown, I also had good > results with a Samsung NC10 netbook. > > I tried the MPF-102 and J201, and each works well, although the J201 FET can > be operated with an Ids current down to 0.5 mA. R89 in the K3 limits the > Ids current. The minimum Ids spec for the MPF-102 is 2.0 mA but seems to > perform the same, albeit with slightly less gain as expected. The D104 > cartridge level is relatively high anyway and I found that in either > configuration, the K3's mic menu could be set for the "low gain" setting. > Also note the inclusion of the optional Rg and Rs resistors. My > breadboarded pre-amp is stable without those components and the gate biases > just fine. I'm also not too concerned about static here in Florida. At > 15-cents ea., the FET is easy and cheap enough to change. > > Finally, if RFI becomes an issue, it may be helpful to experiment with a > bifilar-wound, common-mode choke at the shielded cable entry, close to the > FET. I would try that before attempting differential-mode abatement > techniques (e.g, bypass caps to ground). Similarly, the mic cable at the K3 > connector end can be wound through a #31 core, if necessary. > > Paul, W9AC The circuit requires a single FET (it used to be available at Radio Shack) and two optional resistors. The "D104 with FET" becomes an electret equivalent microphone. If low frequency response becomes a problem Rg may be reduced to as little as 470K to roll off low frequency response. 73, ... Joe, W4TV On 10/8/2013 12:01 AM, Tim Groat wrote: > The basic D-104 (without amplifier) is a crystal microphone, designed > for very high impedance (>100K ohm), and delivering fairly high output > voltage. It worked well with the vacuum tube amplifiers used when the > D-104 was new. The K3 (and other modern rigs) have much lower input > impedance and will load down the crystal mic element considerably. > > There were several amplified versions, the "power mikes" of the CB > craze. These have low output impedance (a few K ohms, varies with the > output level pot setting) combined with high output voltage. Their > output level can over-drive radios designed for dynamic microphones > unless the gain setting is kept very low, or an attenuator is placed in > the output. > > Links: > Adapting D-104 to modern radios (using an op-amp buffer) > <http://www.w6ier.org/images/9908034%5B1%5DAdapting%20the%20Astatic%20D104%20Mic.pdf> > > > Schematics for amplified Astatic mics > <http://www.barovelli.com/projects/radio/radioastatic.htm> > ______________________________________________________________ > 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 > 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 |
Re: Using Lith-Ion batteries in the KX-1
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In reply to this post by Howard Zehr
I should have said 2 x 4-cell pack.
David G3UNA ----- Original Message ----- From: Howard Zehr To: David Cutter Sent: Wednesday, October 09, 2013 12:50 PM Subject: Re: [Elecraft] Using Lith-Ion batteries in the KX-1 David That should work well. I also have a small lith-ion external pack that I use like that. Howard KLXY On Oct 9, 2013, at 4:34 AM, "David Cutter" <[hidden email]> wrote: Nice job, but I couldn't face that right now, so, I just wired a power plug to an external 4-cell AA battery holder which sits next to the KX1. I can fit alkalines or re-chargables. When the external pack is run down, the internal battery takes over while I change the external batteries, a bit like a UPS. David G3UNA ----- Original Message ----- From: "Howard Zehr" <[hidden email]> To: <[hidden email]> Sent: Monday, October 07, 2013 12:42 AM Subject: [Elecraft] Using Lith-Ion batteries in the KX-1 I have just uploaded a video to YouTube that explains how I use Lith-Ion batteries in the KX-1 for more voltage than Alkalines, and thus more RJ output. http://www.youtube.com/watch?v=HFyIWrzE0BE&feature=youtu.be Howard K4LXY Photo gallery: www.howardzehr.com Blog: http://emu.edu/blog/restorative-justice/ FORTHCOMING BOOK (May 2013): Pickups: A Love Story - Pickups, Their Owners, Their Stories (Good Books) http://goodbooks.com/book/9781561487882-pickups--a-love-story-hardcover-with-dustjacket#.UQKcd6WwqX8 ______________________________________________________________ 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 Howard Zehr Blog: http://emu.edu/blog/restorative-justice/ Photo gallery: www.howardzehr.com NEW BOOK: What Will Happen to Me? (children of prisoners) - sample gallery: http://visualpeacemakers.org/index.php?/documentaries/photo_story/what_will_happen_to_me/ ______________________________________________________________ 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 |
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