mark kirchner

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About mark kirchner

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    Hero Member

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  • Location
    Newport Beach California
  • Interested in Sound for Picture
  • About
    I am a still photographer working on collecting visual and aural ethnographic materials. As a researcher my work is inspired by the work of Alan Lomax (ethnomusicologist) and John Collier Jr. (visual anthropologist). My aural research interests include folklore, oral history and photo-elicitation.

    I am working to tune my ears to the rich world of sound. I am learning to record dialogue and natural sounds. In recording dialogue, I strive for high quality recordings, but the captured “spoken content” is often more important to me than the nuances of microphones. That said, I often record in the field and face some of the audio challenges that location sound people do.

    What interests me the most about participating on this site is to increase my audio knowledge and to understand the way the members solve complex issues that they face in their work.


    Mark Kirchner

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  1. Great work! You better get a backup made before the price increases.
  2. For your amusement.......... HAM Radio jacket patch
  3. Aluminum Round Tube Source If you want to use aluminum tubing for the cross-bar on your antenna mast I would like to recommend Marty at Trinity Metal Sales Ebay store. He cuts to length 24" 36" 48" Tube outside diameters 1/2"inch, 5/8"inch* and 3/4" inch in 1/8" inch wall thickness. Note: Read David Waelder thoughts above on reducing metal in and around your antenna. A fiberglass, plastic or even a wooden dowel maybe a better choice over aluminum. Mark * my fittings used 5/8" OD stock
  4. Mogami W3031 (braided copper shield) and Redco TGS-1 I get both for Redco Audio Mark
  5. I think Tom's wiring is correct. My unbalanced hop cable was made by Eric Toline with no connection to the tip on the TX 3.5mm TRS. Works perfectly. I have had 3.5mm locking connectors that "look perfect" that sounded poorly.
  6. Robert, I use pretty much the same settings you are. I think Rick maybe correct in that the "TX hop cable" for the G3 is wired differently. Line level signals connect to the ring on the 3.5 TRS, no connection to the tip. Mark
  7. Great to have Larry add information to this conversation! I wrote Tamara White of Kent Electronics this morning, ( Kent Britain designed the log periodic dipole array 400 - 1000 MHz WA5VJB) that we are using as the antenna for our DYI Shark-Fins. I asked if a balum was necessary for his antennas. Here is the reply from Kent Britain, the design engineer: Most Log Periodics have a high impedance. The Balun or Transformer is converting 200-300 Ohms down to 50 Ohms. The Kent Electronics PCB Log Periodics are designed to have a much lower impedance and sort of wander between 50 and 60 Ohms over the frequency range.They are designed for a direct 50 Ohm match, no balun or ferrites are necessary. Sincerely, Tamara Wlhite, Kent Electronics Tamara's article:
  8. Hi David, Your article for the 695 Quarterly is great! I reread it last night, thank you. I looked at Delrin for the attachment to the antenna, but found a piece of super high-density polyethylene plastic scrap that was the correct dimensions, so I used that. I plan to replace as much metal as possible like the aluminum crossbar and light stand. I am at the “tinkering stage” in the building process. My interest in antennas started with doing the SMA connector modification of the Sennheiser G3. Last week I connected a G3 receiver to one LPDA and did a line of sight test in my neighborhood. I was shocked that I got the same distance (600 + feet) as my earlier, Lectrosonics LR receiver / LT transmitter gear (using whip antennas). The G3 test did not have any “control” to compare with, just a quick test. It also relied on the output feed cable on the G3 as the “diversity antenna” as part of the original Sennheiser design. Thanks again, Mark
  9. Hi Stacy, From my understanding the feed line / phasing harness needs to be at the front of the antenna. I hope this diagram will help. I am learning a lot, but no expert! If the feed line could be placed in the back of the array, miles and miles of wire could have been saved over the years, (see color photo). Mark
  10. Making progress on the log periodic dipole array.
  11. Hi Steve, Thanks! I enjoy building and problem solving. If I don't get into the workshop often, I get rusty (tools too). Mirror Image makes a very nice handle for the Denecke slate. Best, Mark
  12. I just finished my DYI slate handle for my Denecke slate. We have had a lot of rain in California so I finally completed the project. I had more time than money! There are additional posts on the topic in Manufactures & Dealers, but I my case this is a DYI project. Tools used: Drill Press, Drills, Counter Sink Bit, Hacksaw, Files, Tap and Die and a Belt Sander. Materials used: Scrap Aluminum, 2- Flathead Screws, 2- Roundhead Screws, Sandpaper and Lay-out Fluid. Note: I did bore 2 small holes to mount the handle to the slate, using the original Denecke hole spacing (not seen in photos).You can see the layout lines and hole spacing/placement in the bottom image. Mark
  13. Great work Rachel! I have my DIY shark fins (log periodic) antennas on my workbench now. I would suggest in time you add a right angle SMA connector at the wide end of the antenna so you can store the antennas (see photo #15 Matts). Let us know how they are working. Mark
  14. Both Markertek and Redco Audio sell both cables buy the foot. Markertek sells the Canare L-4E5C mini star-quad in different colors by the foot, Redco sells black only.
  15. KARL'S MISSING INFORMATION Lectrosonics Digital Hybrid is about 3 ms, Sennheiser 9000 Series are about 3.4 ms, Zaxcom are about 8 ms. So, for instance if you had a Zaxcom + DPA4071 like the OP described, on the talent, and a wired (no latency) CMIT on the boom that was 4 ft from the talent, then you would want to ADD about 4 ms to the boom channel to match it with the lav channel. Karl / Lectrosonics