CBRT has been

Co-phased?

A place to ask questions about base setup for CB radios or HAM radios. Talk about your experiences, seek advice, and share knowledge.
Post Reply
User avatar
Trouble
Wordwide & Qualified
Wordwide & Qualified
Posts: 729
Joined: Jan 06 2008, 23:49
Contact:

Co-phased?

#170088

Post by Trouble »

Anyone run a base with 2 antennas working simultaneously? I never thought of it before and was just curious.
Wondering, could you run an omni with a beam and TX / RX on them both at the same time?
What do you think about that, huh?

Thanks.
Jesus asked him, "What is your name?" He replied, "My name is Legion, for we are many." -- Mark 5:9
User avatar
pipsqueek
Skipshooter
Skipshooter
Posts: 235
Joined: Jan 16 2008, 06:40

#170108

Post by pipsqueek »

Do-able, but probably not worth it. Co- phased omni's would get you some gain but become directional. The mis-matched antenna thing might be interesting, but I wouldn't co-phase them just on virtue of being mis-matched. Get a 50 ohm splitter (not a tee connector), but a true 50 ohm splitter if you wish to try it. They're not cheap... $50 maybe?
pips
User avatar
Circuit Breaker
Donor
Donor
Posts: 1,665
Joined: Oct 27 2006, 12:30
Handle: Circuit Breaker
Real Name: Stephen
Call Sign: K7CB
Antenna: OCF Dipole
Radio: HR2510/Yaesu FT-950
Contact:

#170210

Post by Circuit Breaker »

You could co-phase two omni-directional antennas...but then they wouldn't really be omni-directional. They would become bi-directional, favoring two directions over all directions.

Also, using an omni-directional and a beam at the same time kind of defeats the purpose. I guess I see where you're going with this...it would allow you to point the beam at someone so you were able to transmit and receive a good strong signal while still transmitting and receiving other directions. However, if not done right, it would probably be worse than just having one or the other. If the signals are 180 degrees out of phase, they'll cancel each other out.
User avatar
Trouble
Wordwide & Qualified
Wordwide & Qualified
Posts: 729
Joined: Jan 06 2008, 23:49
Contact:

#170225

Post by Trouble »

Thanks, was just some hair brained idea I got. Thought it might be cool.
Jesus asked him, "What is your name?" He replied, "My name is Legion, for we are many." -- Mark 5:9
User avatar
dud muck
Donor
Donor
Posts: 1,162
Joined: Dec 14 2006, 22:04
Contact:

Re: Co-phased?

#170228

Post by dud muck »

Trouble wrote:Anyone run a base with 2 antennas working simultaneously? I never thought of it before and was just curious.
Wondering, could you run an omni with a beam and TX / RX on them both at the same time?
What do you think about that, huh?

Thanks.
Running both of the antennas from the same radio, as in co-phasing?
Or, running each antenna on a separate radio?
I am not sure which one your talking about.

If your talking about cophasing... [Please login or register to view this link]

But if your talking about each antenna on its own radio, then you had better have a big property to separate them because when you transmit on one, then receive from another you will have de-sentitization (desense) big time.
Image
Unlimited power permitted on CH1 to CH27 as per FCC CFR 47 part 18: 18.305(a) and 18.301
User avatar
djrebel236

#170404

Post by djrebel236 »

ive never seen anybody co-phase a base antenna yet but, i do run two diffrent base antenna outside of my house, one for my radio, the other for my wife's radio, but like already said, if ya do it, it will become one direction like north/south or east/west, i think a set of beams would be easier to use instead of co phasing 2 base antennas...Dj
User avatar
North Texas Mudduck
Wordwide & Qualified
Wordwide & Qualified
Posts: 2,921
Joined: Sep 30 2006, 20:22
Contact:

#170691

Post by North Texas Mudduck »

Killeen texas house in country
2 50 foot towers
both with Laser 400
both with rotors
hooked to 1 rotor box both beams point north when you hit the brake and left both beams go left when you brake then click right both beams go right
outstanding sight to behold
oh and about 12 Kw on standby
A gun in the hand is better than a cop on the phone
Post Reply