SMALL - espritmodel.com SMALL - Telemetry SMALL - Radio
Reply
Thread Tools
Old Mar 12, 2003, 09:19 PM
Sweet!
Quacker's Avatar
United States, CO, Longmont
Joined Jul 2001
2,823 Posts
The Blackwidow system Is really amazing. Web files don't show the true capability. You have to see in on a TV to really appreciate it.

Q
Quacker is offline Find More Posts by Quacker
Reply With Quote
Sign up now
to remove ads between posts
Old Mar 12, 2003, 11:27 PM
Function Over Form
BillH's Avatar
Connecticut
Joined Feb 2000
1,043 Posts
I'll vouch too for his products, I enjoy mine very much. Range is something that you can improve with better antenna's and amplifiers. That goes for anything wireless.
BillH is offline Find More Posts by BillH
Reply With Quote
Old Mar 12, 2003, 11:37 PM
Registered User
LA, CA, USA
Joined Jan 2003
52 Posts
Quote:
Originally posted by yb2normal
My plan right now is to release a small set of these in a limited beta to see how people abuse them
Bill,

Let me know the second you make these available!

Calvin.
dck47 is offline Find More Posts by dck47
Reply With Quote
Old Mar 13, 2003, 12:39 AM
It just keeps getting better!
Blue Sky's Avatar
Eureka, CA
Joined Oct 2002
1,530 Posts
The spider mite is sweeet!!
Would it run off an ESC's BEC?
I would love to try one!
Maybe pick up a CX-161 at the same time.
I'm still looking for a CX-171.
I called Rock 2000 but only reached an answering
machine. So far they haven't returned my call.
-Dave
Blue Sky is offline Find More Posts by Blue Sky
Reply With Quote
Old Mar 13, 2003, 10:57 AM
Frequent User
yb2normal's Avatar
Broomfield, CO, USA
Joined Jan 2001
1,172 Posts
Just for the record, the rx that comes with the spidermite has a built in, non-replaceable antenna of a pcb/dipole design. So far it appears to be less directional that the patches on my 100mw system, and as such has been more prone to multipath interference when operated in a dense urban environment.

Part of what I want to accomplish before I go into a full Beta is determining the best installation options for the system and best orientation of the receiver antenna to get the best results. This would save the Beta testers a lot of tweaking.

Blue Sky, so far I have been running the units on the battery side of the esc (direct connection to the battery). I hesitate to say it is ok to plug into the receiver to get voltage from the bec, since I still need to do some current measurements on the system. I am also nervous about the idea, just on principle.

Imagine putting the system on your hand-launch glider, with a tail-facing camera? Would make for some gnarly launch videos

- Bill
yb2normal is offline Find More Posts by yb2normal
Reply With Quote
Old Mar 13, 2003, 11:05 AM
Function Over Form
BillH's Avatar
Connecticut
Joined Feb 2000
1,043 Posts
I've been thinking lately, I'd like to take the 100mw system I got from you and put it in a glider, see what the view is like when its spec'ed out. Probably like an airliner!
BillH is offline Find More Posts by BillH
Reply With Quote
Old Mar 14, 2003, 11:00 AM
Frequent User
yb2normal's Avatar
Broomfield, CO, USA
Joined Jan 2001
1,172 Posts
That would be pretty darn cool.

I'm slowly tweaking the setup for the spidermite, I got a little flying in yesterday. Multipath interference is a way of life with this sort of equipment, so my ultimate goal is to get at least 15 seconds of perfect video before each 'hit'... this allows for enough stock footage to edit together a nice video.

Here's a still shot from yesterday's flight:
yb2normal is offline Find More Posts by yb2normal
Reply With Quote
Old Mar 14, 2003, 11:43 AM
Registered User
LA, CA, USA
Joined Jan 2003
52 Posts
Quote:
Multipath interference is a way of life with this sort of equipment
Hey Bill,

Anyway to put the antenna further away from all the electricals (i.e. remote mounting)? In the spidermite picture on your Web site, the antenna appears to be rigged to the case. If you could get the antenna away from the TX and the airplanes electronics, maybe that'd help?

Calvin.

EDIT:

Oops, nevermind Bill. I just re-read a previous post from you where you identify the cause of the interference (the reciever). Okay, to rephrase the question, anyway to hack on a better antenna to the reciever?
dck47 is offline Find More Posts by dck47
Last edited by dck47; Mar 14, 2003 at 11:49 AM.
Reply With Quote
Old Mar 14, 2003, 12:06 PM
Frequent User
yb2normal's Avatar
Broomfield, CO, USA
Joined Jan 2001
1,172 Posts
Quote:
Originally posted by dck47
anyway to hack on a better antenna to the reciever?
Funny you should ask

I just finished hacking apart one of the recievers... and I do mean hack, as they glue the plastic case shut! The integrated antenna is a pcb dipole... pretty elegant design actually. I cut the antenna off (which involved cutting about 2 inches of the pcb board off) and soldered on one of the patch antennas that I normally build for my 100mw RTF system.

A desk run showed that it still receives video

The real question is how it performs in the real world... my hope is that they matched their original antenna to 50ohm, so the hacked on patch won't cause any impedance issues (and therefore reduced range)

If it stays calm out (knock on wood), I'll fly it at lunch.

- Bill
yb2normal is offline Find More Posts by yb2normal
Reply With Quote
Old Mar 14, 2003, 12:12 PM
Registered User
LA, CA, USA
Joined Jan 2003
52 Posts
Awesome, it feels like I'm right there with you.

If it helps, I'm knocking on my desk too.

Let me know how this goes. I'm EXTREMELY patiently waiting for my next paycheck.

Just out of curiosity, once you get an multi-path hit, how long does it usually take for the signal to re-establish itself?

Doesn't multi-path interference usually occur due to shielding/filtering issues? Or is it one of those echo-type things?

Calvin.
dck47 is offline Find More Posts by dck47
Reply With Quote
Old Mar 14, 2003, 12:31 PM
It just keeps getting better!
Blue Sky's Avatar
Eureka, CA
Joined Oct 2002
1,530 Posts
Hmmm....
Might it be possible to mount the entire receiver, dipole and all
against a reflector (flat piece of metal or screen or perhaps a corner refector of said materials) to increase gain and make the
whole shebang more directional? It could be the easiest hack.
-Dave
Blue Sky is offline Find More Posts by Blue Sky
Reply With Quote
Old Mar 14, 2003, 12:33 PM
Frequent User
yb2normal's Avatar
Broomfield, CO, USA
Joined Jan 2001
1,172 Posts
Quote:
Originally posted by dck47

Doesn't multi-path interference usually occur due to shielding/filtering issues? Or is it one of those echo-type things?
It is more the second one... an echo-type thing.

Signals that bounce from surrounding objects interact with the signal from the plane when they reach the antenna, and cancel or corrupt each other.

Generally, you have a perfect video puncuated by complete static for a quarter of a second or so, followed by perfect video again.

Depending on the antennas and the environment, the lost video can go on for longer, which of course makes it hairy when trying to fly under the hood!

As it is designed, the receiver included with the spidermite is very well designed for fixed installations. We just have to figure out how to make it work well in our mobile application, which could mean anything from constantly pointing the receiver antenna at the plane, to replacing the antenna with a patch. We'll see where we end up!

Bill

EDIT: Just saw your post Blue Sky. That is an extremely good idea. The antenna element inside the receiver would be a good match for a corner reflector. One more experiment to try!
yb2normal is offline Find More Posts by yb2normal
Last edited by yb2normal; Mar 14, 2003 at 12:51 PM.
Reply With Quote
Old Mar 17, 2003, 08:39 PM
"Heli-Pimp"
kdill2160's Avatar
McHenry, IL
Joined Mar 2003
2,943 Posts
Camera equipment

Check out www.camera-shack.com for all type of wireless video transmitters, board cameras (incl PAL format) Also the correct components to fabricate wiring harness for those small molex wafer connectors. 1.25mm and 1.5mm pitch. Transmitters from 10mW to 1Watt.

I build and fly helis and just got done with a humming bird electric with wireless video downlink. BUT I'm experiencing interference from the electric motor when powered from the fligh battery. I need someone experienced to help solve the inteference problem but it flys and the whole system only weight about 3/4 ounce. If anyone can help please contact me anytime

kdill@camera-shack.com
kdill2160 is offline Find More Posts by kdill2160
Reply With Quote
Old Mar 17, 2003, 11:43 PM
Frequent User
yb2normal's Avatar
Broomfield, CO, USA
Joined Jan 2001
1,172 Posts
Please do post some example videos from this equipment at the shack.

It will help folks make an informed decision.

Kind Regards,
Bill
yb2normal is offline Find More Posts by yb2normal
Reply With Quote
Old Mar 18, 2003, 05:11 PM
Hating Profile Planes :-)
glockengockel's Avatar
Germany
Joined Nov 2002
241 Posts
Hello,

may on of these antennas would increase the performance?

http://212.227.63.145/kern/Neu/produ...c100_84010.htm

Regards
glockengockel is offline Find More Posts by glockengockel
Reply With Quote
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Discussion Black Widow sells Video Glasses gtxkid Aerial Photography 8 Dec 27, 2006 08:44 PM
Off Site Black Widow wireless equipment, ECt rays89 Aircraft - Electric - Airplanes (FS/W) 2 Aug 05, 2005 11:09 AM
Sold FS Black Widow Wireless AV system. airmcn_3 Aircraft - General - Radio Equipment (FS/W) 3 Jun 06, 2005 05:28 PM
Black Widow BWAV200 - How good of a system? RUNVOUS Aerial Photography 2 Nov 20, 2003 01:58 PM
Wireless video from black widow jimbarstow Electric Plane Talk 4 Jul 17, 2002 09:52 PM