Patrick Hammer
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  • Cheltenham, Gloucestershire County
  • United Kingdom
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  • Mark Colwell

Patrick Hammer's Discussions

ONBOARD AVOIDANCE RADAR - NOW POSSIBLE?

Started this discussion. Last reply by Erik Hatch Mar 30, 2011. 9 Replies

A long standing issue flying RC/UAV models in so-called “commercial airspace” has been the issue of safety associated with “situational awareness” i.e the ability of an  RC/UAV model to unilaterally…Continue

SOME NOTES ABOUT IR CAMERAS

Started Sep 12, 2010 0 Replies

A note regards IR cameras .........IR cams are not cheap pieces of hardware – usually beyond the budget of DIY’ers and hobby flyers – or, need they be?Most IR cams are sold through resellers i.e.…Continue

INTEGRATOR UAV (by Insitu – now part of Boeing)

Started this discussion. Last reply by Patrick Hammer Aug 26, 2010. 18 Replies

Hi GuysDoes anyone have any model plans for the INTEGRATOR UAV?Anyone have any idea what the wing sweep angle is on this airframe (?) – have looked high and low on the internet, but like most unique…Continue

WHICH WING - REAR DELTA with FRONT CANARD?

Started this discussion. Last reply by Vladimir Popov Oct 25, 2010. 3 Replies

Some questions ...............I’m in the early stages of investigating different airframe possibilities – looking at the pros & cons of different layouts, shapes, sizes, wing profiles etc etc …………Continue

 

Patrick Hammer's Page

Profile Information

About Me:
Just retired after 38 years in the European defence industry - in antenna research/design and development. Last 10 years with emphasis on research into airborne DSP (digital signal processing) hardware & UWB's (ultra wideband antennas). Final projects prior to retirement: design and development of antennas for the EADS Typhoon and A400M projects.

Knowledge of UAV's - limited to negligable I'm afraid, other than for research into antennas for data links.

The DIY DRONES website is a great database for homespun & open-source UAV projects and UAV design/development and control - however, when it comes to antenna's, there appears to be a big gap. I'd like to see myself been able to contribute significantly to that side of things.

Anyone have any question/s about antenna's - would be happy to comment and share my experience and ideas.
Please tell us a bit about your UAV interest
Have always had an interest in R/C models and model building - but never had much time to pursue the interest. Now have the time to get involved and starting off by getting up to date with the current "state of play" regards R/C & FPV technology.
Hometown:
Cheltenham

Comment Wall (2 comments)

At 6:56pm on August 24, 2010,
Developer
Mark Colwell
said…
I want to build a 910 Mhz Quad to send TM and video. I have access to lots of surplus Rf parts. I started with a tissue tube and wrapped 1.5 mm wire to form helix. i have not tested it yet. I think foil vs wire would work and be easier to fabricate too.. I look forward to your posts. I was Electronic Tech in US Navy served in Scotland 3 years communications and radar. Then went on to systems flight testing at Edwards AFB, Planned testing of all B-2s Cularis is a great plane to start with just have a experienced RC pilot guide you.
At 1:31am on August 25, 2010, Patrick Hammer said…
Hi Mark

Whats the tube made out of? - you realise that the dielectric constant of the tube material is going to result in you having to reduce the tube dia. by about 25% - 30% if you want to maintain tuned resonance for 910Mhz. It'll still work if you maintain dimensions for 910Mhz - no prob's there but I suspect your SWR will be way off ideal. Slit the tube lengthways and reduce the dia so its resonent for around 1300Mhz - that'll work much better.

Foil won;t make much difference - should work just as well. SWR is th big issue when making a DIY helix. Good luck....... and make sure you have a decent reflector at the back. Should work just fine.

My neighbor has lots of RC flying experience - I've roped him in for a few weekends. One I've got the idea of things I'll give thought to building a larger model.

Regards

Patrick.

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