mark kirchner

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About mark kirchner

  • Rank
    Hero Member

Profile Information

  • Location
    Newport Beach California
  • Interested in Sound for Picture
    Yes
  • 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.

    Sincerely,

    Mark Kirchner
    www.manzanarpilgrimage.com

Recent Profile Visitors

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  1. I think Samy's camera has a store in San Francisco. Adolph Gassers is closed.
  2. I found 4 vintage Lectrosonics A-GPU ground plane antennas this year. They are a great addition to my kit. Thanks for sharing your excellent metal-working. LectroAGPU.pdf
  3. Posting 2 photographs of my finished log periodic dipole array antennas. I would also like to thank Doug Tourtelot for building the RG-8X cables for me and David Waelder for his articles and antenna tests.
  4. I second JonG, Sound Guys Solutions on all my boom poles.
  5. You will get a hard copy in the mail, but no card. Make a photo of the paperwork and store it on you phone just incase you need to prove you are a part 74 license holder.
  6. Great work! You better get a backup made before the price increases.
  7. For your amusement.......... HAM Radio jacket patch
  8. 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. http://www.ebay.com/usr/highdesertmartin 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
  9. Mogami W3031 (braided copper shield) and Redco TGS-1 I get both for Redco Audio Mark
  10. 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.
  11. 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
  12. 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: https://turbofuture.com/misc/How-You-to-Use-a-400-1000-MHz-Log-Periodic-Printed-Circuit-Board-Antenna
  13. 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
  14. 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
  15. Making progress on the log periodic dipole array.