I build a 13m high mast for my vhf/uhf antenna last summer. Your calculations are great, might use them for next summer as I'd like to change the guy lines.
We have a product over here called Mastrant. It comes in different diameters and I used it to replace the metal guys I had on my tower. Am looking forward to your building up a four-square as I would like to put up one for 30 meters. 73 de n0km
@@DXCommanderHQ As always, great video, Cal. Good call on dropping the tower. In the south of England, we are supposed to have 50 / 60 MPH winds tomorrow. A tad scary!
Hi Callum, thank you so much for this, I have been working on this project plan for the last couple of days, so your timing is impeccable as always…lol A great video but I will be honest I’m not missing the cold weather here in the Philippines 😮
Nice. But one question: why do you only attach them 1 foot above the ground? I have erected poles at the corners of my yard and attached the guy lines at a height of about 2 m. Not the lowest guy level at a height of 1 m, of course. That way I can easily drive under it with the lawnmower. And I'm no structural engineer, but I'm of the opinion that the more horizontally the guy lines are tensioned, the less tension they have to absorb.
I made mine half the distance to the top of the tower. Ideally, it should be longer but I wanted the exact dimensions of a 40m 4-Square antenna array on 40m which was 7.38m from tower to guy.
Nice Callum. I haven't checked through properly as just about to shoot out the door for work, but the 0.5 m in your example that you knock off for height of guying tie off point should be deducted from the height of guy ring / bearing before it's squared, as opposed to being knocked off the final answer. You may have done this (apologies if so), and for small numbers it doesn't make an awful lot of difference, but it may as well be correct in the calcs. 73 M3KXZ
Love your videos Cal could you do a few videos teaching the intermediate licence please Mate as im struggling ive read the new book so many times its all jumbled in my head now 😂
OK.. Easy fix. Go back and do my foundation playlist.. Once you have that, work out what you don't know. Then budget to fail some of the Intermediate questions but score 100% on the rest. That's what I did on the "full" or what ever it was called..
If you have a science based mind, then you would have taken it in. Diverse folks or people more into art and languages over science and maths wouldn't know.
@@DXCommanderHQ Again I don't know how bad the state of education is in the UK but Pythagoras theorem is taught in 3rd grade primary school here and anyone that had finished primary school has done that calculation thousands of times.
Thanks Callum! I knew there had to be a formula for that.
I've been out of school for 60 years and couldn't remember it!
73
Thanks Cal for all you do for us.....
Thank you sir. Handy spreadsheet for any tower project.
You're welcome
Very useful spreadsheet Callum, thank you.
No worries!
Very useful Callum. Thank you
Very welcome
Love the videos my friend! Keeps me waiting to see what's next...
More to come!
Spreadsheets are the best. Great video and explanation!
Woo-hoo!
Nice way for calculating guy ropes length. With the cost of them lines ,This comes in handy .
Yes, thanks!
I build a 13m high mast for my vhf/uhf antenna last summer. Your calculations are great, might use them for next summer as I'd like to change the guy lines.
Go for it!
We have a product over here called Mastrant. It comes in different diameters and I used it to replace the metal guys I had on my tower. Am looking forward to your building up a four-square as I would like to put up one for 30 meters. 73 de n0km
Yes we stock Mastrant in 2mm and 3mm however I'm also a fan of Marlow having a marine racing pedigree.
Snow!
Very Interesting Cal.
Great content.
Nice!. Thanks for the spreadsheet.
You bet!
Good stuff. First and only time i used Pythagoras since school was when I was in need of guys the first time. Stay in school kids 😅
Useful information Cal cheers storms heading our way according to the forecast stay safe
Yep.. Dropped the tower today for maintenance and I think I'll leave it down!
@@DXCommanderHQ As always, great video, Cal. Good call on dropping the tower. In the south of England, we are supposed to have 50 / 60 MPH winds tomorrow. A tad scary!
Very useful info thanks
My pleasure
Hi Callum, thank you so much for this, I have been working on this project plan for the last couple of days, so your timing is impeccable as always…lol A great video but I will be honest I’m not missing the cold weather here in the Philippines 😮
Yeah man.. CHilly here!
Who knew Callum was a Rhodes Scholar in Mathematics! 🤯
That was EXCELlent 😃
Thanks! 😃
Some guys are longer than others.
It's easy to calculate the guys separately on paper anyway.
Thanks that is what i need for a new mast that need guy ropes 73
Very handy, thanks Cal
Thanks, Cal! Downloading the file now. :)
I appreciate you not wanting to work outside in bad weather, but remember with antennae if you work on them in bad weather they're guaranteed to work.
Every time!
Nice. But one question: why do you only attach them 1 foot above the ground? I have erected poles at the corners of my yard and attached the guy lines at a height of about 2 m. Not the lowest guy level at a height of 1 m, of course. That way I can easily drive under it with the lawnmower. And I'm no structural engineer, but I'm of the opinion that the more horizontally the guy lines are tensioned, the less tension they have to absorb.
Because the dogs won't run into them here and also MUCH less force on the blocks of concrete under the ground.
Signature 9 black friday ⏰️
Haha!
Awesome! Thanks.
In any right angled triangle the square of the Hypotenuse is always equal to square of the other two sides :-)
How do you determine the distance from the mast to the guy anchor?
I made mine half the distance to the top of the tower. Ideally, it should be longer but I wanted the exact dimensions of a 40m 4-Square antenna array on 40m which was 7.38m from tower to guy.
Antennas work better when they are put up in the snow. 😉
Very interesting
Using a long pole on the inside could a DXCommander be put in a tree?
Why not!
Nice Callum. I haven't checked through properly as just about to shoot out the door for work, but the 0.5 m in your example that you knock off for height of guying tie off point should be deducted from the height of guy ring / bearing before it's squared, as opposed to being knocked off the final answer. You may have done this (apologies if so), and for small numbers it doesn't make an awful lot of difference, but it may as well be correct in the calcs.
73 M3KXZ
I *think* it is.. Actually, assuming is dead-square, I take it off both the buy and the mast (because we need precisely 90 degrees).
first view! First comment!
C^2 = A^2 + B^2. Many thanks for another useful video.
great video...
Thanks!
Love your videos Cal could you do a few videos teaching the intermediate licence please Mate as im struggling ive read the new book so many times its all jumbled in my head now 😂
OK.. Easy fix. Go back and do my foundation playlist.. Once you have that, work out what you don't know. Then budget to fail some of the Intermediate questions but score 100% on the rest. That's what I did on the "full" or what ever it was called..
Grandma always said Geometry would save my life someday and she was right. 😁
HA!!
Pythagoras theorem is a part on 3rd grade primary school math around these parts. One would expect that it is common knowledge?
I'm surprised that you are surprised.
@@DXCommanderHQ 😁😁 Things are that bad in the western world?
If you have a science based mind, then you would have taken it in. Diverse folks or people more into art and languages over science and maths wouldn't know.
@@DXCommanderHQ Again I don't know how bad the state of education is in the UK but Pythagoras theorem is taught in 3rd grade primary school here and anyone that had finished primary school has done that calculation thousands of times.
Snow...I keep forgetting just how far north you are.
Brrrrrrrrrrr