Topic: Anyone know about antennas?
started by: Liberal
Posted by Liberal on Nov. 22 2015,10:04 am
I cracked the cover on one of my covered cloverleaf video and audio transmission antennas. The front one that had a cover is not even soldered on one wire but the thing that bothers me is it's soldered in reverse. The first one is soldered so the angles resemble a clockwise prop. The cheaper uncovered one in back is soldered so that it resembles a counterclockwise prop.I wonder if this causes reception problems because my signal starts getting snowy about 200m out but it sort of flickers it doesnt ever drop out completely which makes me think it could also be the unsoldered connection.
A 200m limit on a 2k A/V transmitter is crazy, but not a big deal for me because I use the camera mostly to figure out which way I'm pointed, and rarely fly over 40m to 50m in altitude so it's not going to cause me to crash, or lose the quad.
Posted by Expatriate on Nov. 22 2015,1:26 pm
Doubt I can tell you anything you haven't already discovered, I’ve built several antenna over the past few years. The big difference mine were receivers, you’ve built a broadcast antenna, you’re turning an electrical frequency into radio waves.Your antenna is broadcasting in all directions, part of this signal is going downward, I’m wondering if you took an old pie-tin (aluminum) or paper plate covered in aluminum foil, placed it below the antenna like a reflector if you’d have some gain without messing with the frequency. You’ll have to space it so you don’t narrow the signal, sounds logical, might help, might not. I never soldered either sided of my antenna, as long as the the connection is good it'll work..
strictly guessing, I’m just an arm-a-chair...
Edit: a digital receiver has two sides joined by a transformer, one is the reverse of the other, I believe it has to do with high and low pick up, but can't remember. I think this is what you're describing on your antenna. Don't think the connection matters, used auto style connectors on mine.
Posted by Botto 82 on Nov. 22 2015,2:56 pm
Wouldm't a left-hand circular polarized antenna phase-cancel out a right-handed one?Are both antennas hooked to the same RF output?
Posted by Liberal on Nov. 22 2015,4:20 pm
Botto, that's what I was thinking, so now I've got to knock the cover off of the RX side on other A/V receiver. I guess if other RX is reversed I'll have just to reverse the top and bottom of each wire on the front antenna. Or I could buy another one like the back one for $10Expat, they sell them like that and although you've got to point them at your vehicle they achieve incredible range. Ive seen a few YouTube videos where I'm pretty sure they're breaking the law because they fly well out of range of eyesight.
Posted by Botto 82 on Nov. 22 2015,6:26 pm
This looks like a more sensible array. If yours are both on the same RF connection, I'd try running on just one, and see if performance improves.
Posted by Liberal on Nov. 22 2015,8:44 pm
It's actually 2 transmitters a boscam 805 upfront and I got one behind it that's about 25% of the size of the front one
Posted by alcitizens on Dec. 12 2015,1:16 am
All I know is the higher you get, the better the reception gets.. I'm not saying getting stoned or anything.. 