Multiple Antenna Mounting Options on Roof?

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sonyxperiageek

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#293565 30-Jan-2022 16:07

Hi folks, is there some contraption that would mean I could mount two fibreglass antennas on the one antenna mast already on the roof, without having to drill another mast onto the roof? Picture below.

And also interference between antennas? One is 915Mhz and the other is 1090Mhz.

Sony

richms

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#2858543 30-Jan-2022 16:19

If you put a 915 Lora or something up there that close to the tv antenna, and you still use it then expect it to overload the input of any TV that you use when it transmits.

Richard rich.ms

Tinkerisk

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#2858546 30-Jan-2022 16:22

Maybe something like that?

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richms

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#2858555 30-Jan-2022 16:58

Ask these guys on trademe. I know that before they moved from hillside road they had a tonne of weird mounts and poles etc, Seems their own website is down or something but a friend did get some parts from them a year or so back. https://www.trademe.co.nz/a/marketplace/electronics-photography/search?member_listing=192159

Richard rich.ms

sonyxperiageek

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#2858560 30-Jan-2022 17:14

richms:
If you put a 915 Lora or something up there that close to the tv antenna, and you still use it then expect it to overload the input of any TV that you use when it transmits.

We haven't watched TV in God knows how long lol. I might as well take it down.

Sony

sonyxperiageek

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#2858561 30-Jan-2022 17:17

Tinkerisk:
Maybe something like that?

Oh yeah this could work! Now just need to see where I can source one from here lol

Sony

sonyxperiageek

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#2858626 30-Jan-2022 18:27

richms:
Ask these guys on trademe. I know that before they moved from hillside road they had a tonne of weird mounts and poles etc, Seems their own website is down or something but a friend did get some parts from them a year or so back. https://www.trademe.co.nz/a/marketplace/electronics-photography/search?member_listing=192159

Thanks, will see if they have anything similar to the above.

Sony

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elpenguino

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#2858930 31-Jan-2022 00:05

It can be done with cavity filters but the cost and size is not good for you.

Distance(spacing) is your friend, especially if they're both vertically polarised.

OTOH what's the transmit power in the 915MHz device - and how often does it transmit. If it is very small packets here and there, it may not be so bad.

And what's the 1090 MHz for? Transmit and receive?

Most of the posters in this thread are just like chimpanzees on MDMA, full of feelings of bonhomie, joy, and optimism. Fred99 8/4/21

sonyxperiageek

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#2859620 31-Jan-2022 21:54

Transmit power for 915 is 30dBm, don't think it transmits very often - it's for a Helium miner.

1090 is for ads-b and is receive only.

Sony

sonyxperiageek

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#2859622 31-Jan-2022 21:55

Tinkerisk:
Maybe something like that?

Lol it seems to be extremely hard trying to find something like this here!

Sony

elpenguino

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#2859689 1-Feb-2022 00:50

sonyxperiageek: Transmit power for 915 is 30dBm, don't think it transmits very often - it's for a Helium miner.

1090 is for ads-b and is receive only.

Hmm. 1W.

When it does transmit, even if there is no interference that breaks through, if the aerials are very close, it will de-sensitise the other receiver while it transmits.

Most of the posters in this thread are just like chimpanzees on MDMA, full of feelings of bonhomie, joy, and optimism. Fred99 8/4/21

rogercruse

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#2859750 1-Feb-2022 09:38

Time to dump the aerial and contact to the internet for your tv entertainment

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Tinkerisk

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#2860219 1-Feb-2022 19:50

sonyxperiageek:
Tinkerisk:

Maybe something like that?

Lol it seems to be extremely hard trying to find something like this here!

Maybe you can ask a plumber to bend one for you from aluminum tubing or use two 90 deg copper joints with tubing from the hardware store. Nevertheless you need the crosslink mast joint but they are small enough to be shipped to NZ (I got mine here from amazon). Note the holes for the antenna cables to be routed inside of the tube. Try to use same materials or isolate them. Otherwise you build a galvanic battery due to electrochemical processes between the materials and they fade away by the elements.

RogerMW

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#2860247 1-Feb-2022 21:12

Try Element14 - https://nz.element14.com/stellar-labs/33-10995/double-antenna-adapter-mount/dp/2801885

Was under $40 delivered, although was on backorder for a week. I just put one up to handle 2 ADSB antenna. Only issue is that it will likely need some "adjustment"
to get the antenna vertical.

lmnop

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#2861905 5-Feb-2022 00:42

rogercruse:
Time to dump the aerial and contact to the internet for your tv entertainment

Hmmmm.

Try to pipe "TV entertainment" down my noisy rural water-filled Chorus multi-pair cable VDSL connection fed at the local cabinet from an overloaded neighbourhood Chorus fibre feeder from town (or a $$$ metered rural 4G), while there's teenagers in my house on Tiktok and MMPOG or whatever ?

No thanks! I'll stick to the $10 TV aerial and multiple $5 RTL-SDR's and tvheadend and Kodi for full HD for $0/month with zero lag/buffering.

It still works when someone puts a backhoe through the cable, too.

Tinkerisk

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#2876607 28-Feb-2022 23:09

sonyxperiageek:
Tinkerisk:

Maybe something like that?

Lol it seems to be extremely hard trying to find something like this here!

Well? How did things turn out in the end?