To cophase or not to cophase

[Captain Kilowatt]

Ok, perhaps this might not be the right forum to find an Elmer but, let me break this down Barney Style for those of you who have confused this thread with Twitter:

No need whatsoever for that kind of response to people that are trying to help you. If you had provided the PROPER and COMPLETE info the FIRST time things would have been different as you have clearly seen after you provided the info below.

I have cophased 11 meter band top loaded antennas for use while underway. Once parked for the night, I can climb the ladder and quick connect the 10 meter band whip(s), switch over the coax, and do some SSB for an hour before turning in for the night. Yes, this requires me to get out of my seat and venture outside for a few minutes but, exercise is good for the body, which is why I chose flatbed over dry van.

Anyone else confused? Anyone have any helpful antenna theory centered comments about the subject at hand?

 

[Sergeant Bilko]

Sounds interesting, post a pic of your final setup.

I will. I'm looking at a 21' collapsible mast using a couple quick locking truss clamps. This setup would resolve all my issues and provide outstanding TX/RX. Thanks for the idea!

 

[Tallman]

Then, all I need to do it fold it out, insert the mast into a quick clamping mounting point, orientate, drop the coax down to an external connection point and BAM. I like that idea.

Horizontal orientation would be less noisy on receive and after the signal hits the upper atmosphere the polarization is ambiguous anyway.

 

[fourstringburn]

I will. I'm looking at a 21' collapsible mast using a couple quick locking truss clamps. This setup would resolve all my issues and provide outstanding TX/RX. Thanks for the idea!

I made a mast from using 2-10 ft.different size galvanized pipe placed inside the other for telescoping and secured it with a hole drilled near the highest extension point and secured it with a bolt. 1 1/4 pipe should slip inside 1-1/2. Drill a hole in the top of the 1 1/4 section and use a bolt there so it'll be easier to pull back up after collapsing.

You can still buy Channel Master 25 ft telescoping TV antenna masts. These are lighter than galvanized pipe and are in 3 sections so it'll collapse to about 8 ft.

MFJ sells 33ft fiberglass masts which collapse even shorter due to multiple sections. These aren't as sturdy if extended all the way up though and need to be guyed but should be ok up to 20ft. Take a look there for some ideas.

good luck!

 

[Bandit1]

That's just way to much stuff to try to make happen
I'd just go with another antenna
Co phase is to directional like a beam
Just not worth it

 

[Flatop]

You're likely to run into trouble with 1/8 wave spacing, 1/4 is tricky enough. The effects associated with mutual coupling is magnified so much in my opinion that you would need the equipment to do the practical to get anywhere near knowing what's going on. Very complicated technically, too hard basket.