Thanks again for the beautifully detailed information you give us. That’s brilliant and all understood justin but why do people stack antennas horizontally side-by-side. And I wonder is this rule the same if the aerial is placed vertically instead of horizontally.
I hope you don’t mind me getting back to you again. You said you would need to know more about the set up so I shall tell you more. I haven’t been confused with the information it’s just the information I’ve been given and now you have alerted me this is something I can pass this onto other people. I have two Mass pro WH15 beams I have one Port Power divider I have 2 x 3m lengths of Hyperflex 7 They connect to the splitter which connects to 3m’s more Hyperflex seven which then connects to 5m’s LDF450 to the radio 📻.
Absolutely brilliant information but I’m struggling with the stacking distance you said 3.4 m apart for 2 m antennas, where does that figure come from and I am stacking 70 cm beams what would that be? Please help
Stacking distances are not fixed, they vary with the beamwidth of the Yagi and therefore the boom length. This means the longer the booms of the antennas you are stacking, the wider the spacing between them needs to be.
Thanks very much for your reply Justin I was told it had to be an odd multiple of half waves apart obviously this is not true. One particular issue I have is I have a tripod and have done tests with 2 x 70 cm beams, The SWR was 1.1 to 1 but when I put it on the roof assembled as it was it is now 1.7 to 1🤔😡. And because I have now stacked the antenna one of the phasing lines are too long so I have wrapped this into a kind of choke. Do you think this would be a problem. And the reason for the 1.7 to1. Do I need to change the length of the phasing lines? To bring the SWR down.
@@JEFF-Elliott You are confusing facts about stacking. if you are using a phasing line made from 75Ohm coax, then this must be odd 1/4 wave multiples once velocity factor is removed. With regard to SWR I really don't know without seeing or knowing a bit more about the installation
@@JEFF-Elliott if the swr is set to a low value close to ground or obstructions I have found in the past when setting up antennas that the value changes once it is up at height.
This is a great video. So if I stack 2 side by side, but polarize them vertically, will that even help to narrow down the pattern for a distant 2m repeater?
Hi Justin. listened with great interest to your quad video's. why do you not make and sell any 70cm quads? also if you will, what is you're opinion on "biquads and "double biquads? thanks, Peter
Your analysis is rather flawed as you have not considered ground effects. Your antennas are essentially infinitely high. This might be OK for UHF antennas on high towers.
Thanks again for the beautifully detailed information you give us. That’s brilliant and all understood justin but why do people stack antennas horizontally side-by-side. And I wonder is this rule the same if the aerial is placed vertically instead of horizontally.
I hope you don’t mind me getting back to you again. You said you would need to know more about the set up so I shall tell you more. I haven’t been confused with the information it’s just the information I’ve been given and now you have alerted me this is something I can pass this onto other people.
I have two Mass pro WH15 beams I have one Port Power divider I have 2 x 3m lengths of Hyperflex 7 They connect to the splitter which connects to 3m’s more Hyperflex seven which then connects to 5m’s LDF450 to the radio 📻.
best to mail me on justin@g0ksc.co.uk
Do you think that using shotskie triangle material would increase the gain ??? This antenna stuff is really a complicated bit of kit.
Absolutely brilliant information but I’m struggling with the stacking distance you said 3.4 m apart for 2 m antennas, where does that figure come from and I am stacking 70 cm beams what would that be? Please help
Stacking distances are not fixed, they vary with the beamwidth of the Yagi and therefore the boom length. This means the longer the booms of the antennas you are stacking, the wider the spacing between them needs to be.
Thanks very much for your reply Justin I was told it had to be an odd multiple of half waves apart obviously this is not true.
One particular issue I have is I have a tripod and have done tests with 2 x 70 cm beams, The SWR was 1.1 to 1 but when I put it on the roof assembled as it was it is now 1.7 to 1🤔😡. And because I have now stacked the antenna one of the phasing lines are too long so I have wrapped this into a kind of choke. Do you think this would be a problem. And the reason for the 1.7 to1. Do I need to change the length of the phasing lines? To bring the SWR down.
@@JEFF-Elliott You are confusing facts about stacking. if you are using a phasing line made from 75Ohm coax, then this must be odd 1/4 wave multiples once velocity factor is removed. With regard to SWR I really don't know without seeing or knowing a bit more about the installation
@@JEFF-Elliott if the swr is set to a low value close to ground or obstructions I have found in the past when setting up antennas that the value changes once it is up at height.
This is a great video. So if I stack 2 side by side, but polarize them vertically, will that even help to narrow down the pattern for a distant 2m repeater?
Hi Justin. listened with great interest to your quad video's. why do you not make and sell any 70cm quads? also if you will, what is you're opinion on "biquads and "double biquads? thanks, Peter
but what about polarisation?
Your analysis is rather flawed as you have not considered ground effects. Your antennas are essentially infinitely high. This might be OK for UHF antennas on high towers.