About

Gender

Male


Location

Twentynine Palms, CA


About Me:

QC manager for Gov construction projects. Ham radio operator,KB6WSQ. Lifetime interest in radio and electronics. Professional Photographer.


Please tell us a bit about your UAV interest

Arduplane. FPV. Search and Rescue.


Hometown:

Twentynine Palms, Ca.


Activity Feed

Geoffrey Preston commented on Gisela & Joe Noci's blog post Antenna, Feedpoint matching, Baluns, Turnstiles and why Complex homegrown antenna mostly do not work...
"Great Blog Post Joe"
Apr 5, 2014
Geoffrey Preston commented on Geoffrey Preston's blog post If This Is Real.....WOW!
"Video of the components in those heli's"
Mar 3, 2014
Geoffrey Preston posted a blog post
 R/C helicopter lifting a woman!If this is real then it's quite a feat. Not to mention very dangerous.I'd like to think that this is more than just great photoshop skills
Mar 2, 2014
Geoffrey Preston commented on Geoffrey Preston's blog post Controlling Radio Frequency Interference
"@Jethro
 I guess you could use that. Ground it though."
Feb 28, 2014
Geoffrey Preston posted a blog post
RFI is often a very frustrating problem but the following information may be of help. You may have RFI and be unaware of it and following these precautions might increase your range.If possible keep your wire/cable runs away from transmitters, coax…
Feb 27, 2014
Geoffrey Preston replied to Finnius's discussion 915mhz Telemetry
"Inverted V is a dipole forming a slight "V" in order to create a load impedance closer to 50 ohms... a better electrical match to a 50 ohm transmitter.
 Plenty of hobbyists would argue that a clover leaf is better and it may be for some situations.…"
Feb 20, 2014
Geoffrey Preston replied to Finnius's discussion 915mhz Telemetry
"An inverted V is horizontally polarized with the elements parallel to the earth. You should get good range if your not in an urban environment, perhaps several miles with good line of sight and the UAV at altitude. See the sketch for polarization of…"
Feb 19, 2014
Geoffrey Preston replied to Finnius's discussion 915mhz Telemetry
"The interference can be minimized by separating them apart as far as possible. One for each wing seems like a good idea.  I published something here some time ago.
http://diydrones.com/profiles/blogs/more-antenna-alternatives
 using copper tape as a…"
Feb 19, 2014
Geoffrey Preston replied to Finnius's discussion 915mhz Telemetry
"It seems like we can’t cram enough electronics into our UAVs. You might get away with using two bands that are close together if your electronics are well filtered, but I wouldn’t bank on it. You simply can’t get enough distance between the differen…"
Feb 19, 2014
Geoffrey Preston commented on HeliStorm's blog post Is that a DJI Phantom in your pocket?
"No, I'm just happy to see you."
Nov 5, 2013
Geoffrey Preston commented on Christiaan van Vollenstee's blog post Can you spell 2000mw at 5.8 Ghz!!!!!
"Seems like a great transmitter. 2 watts seems like a lot of power but at 5.8 ghz it really doesn't pan out that way in terms of effective transmit range.  2 watts at 900 mhz travels a lot farther than 2 watts at 5.8 ghz. The Friis equation spells th…"
Sep 18, 2013
Geoffrey Preston commented on Geoffrey Preston's blog post Mini DC-DC Voltage Stabilizer/Regulator Module
"Andrew
 I like the screw terminals and mounting holes on that one, it could be swapped out easily. What LC filter are you using?
g"
Sep 11, 2013
Geoffrey Preston left a comment on Ham Drone Builders
"My X8 has been in the box for over a year, I opened the box when it arrived,  did a parts check and thought I'd get to it a week later, hi hi."
Sep 11, 2013
Geoffrey Preston commented on Geoffrey Preston's blog post Mini DC-DC Voltage Stabilizer/Regulator Module
"prodctodc.com seems to have some good stuff. Too bad we cant get the things we need in the USA at a decent price.
g"
Sep 11, 2013
Geoffrey Preston commented on Geoffrey Preston's blog post Mini DC-DC Voltage Stabilizer/Regulator Module
" Your right. Grounding and shielding is SOP for components such as this. As for how clean the output is visit the site , conduct your own tests, and add capacitors as needed. At $3.80 US it is a very useful component. The site has other regulators a…"
Sep 11, 2013
Geoffrey Preston posted a blog post
  Ran across this and just wanted to share. Great for getting all the different voltages of your components to operate off ofone source. One module per each different voltage requirement, small and light weight. Adjustable for input voltage and outp…
Sep 11, 2013
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