1 Antenna, 4 SDRs Wideband

[ExportEh]

Hi All.
Kind I kindly ask for your recomendations for a wideband multicoupler that would fit my usage?
I'm still pretty new to all this so bare with me.

I have a Diamond D130J and currently 4 SDRs.
I have 3 seperate antennas (2 little mag mount ones) and the D130J that will soon be mounted on the roof.
2 antennas are for trunking in the 142mhz range. 1 antenna is used for ADS-B.
For the 4th SDR, I want to use it for browsing around the whole D130J range with a fair amount of time in the 400-460mhz range.

Most multicoupler I've seen stops at 1Ghz. ADS-B is at 1.090. Looking for a good 4 port, maybe 8 port for future proofing that I could use across the whole range of my Discone. This way I can get rid of the little mag mounts, use 1 antenna and get the misses to stop nagging me about all the cables

I'm not interested in transmitting. I'm more of a listener than a talker.
Anything you can recomend would be appreciated.

Thank you!!

 

[ExportEh]

Sorry.... I should have posted in Splitters, Filters and Multicouplers
Can this be moved or deleted?

​

 

[KevinC]

Sorry.... I should have posted in Splitters, Filters and Multicouplers
Can this be moved or deleted?

​

Done!

 

[BC_Scan]

I use a Moto BDA-K4-RA along with an electroline EDA-UG2802 8 port off my discone up as high as you can get works like a hot damm, dont forget good quality coax RG-6 will work , longer runs others here will swear by LMR etc

 

[dave3825]

I use an Electroline 2800 8 port. It goes to 1000 mhz and I still get planes on 1090.00

https://www.multicominc.com/wp-content/uploads/Electroline-DROPAmp-Datasheet.pdf

 

[ExportEh]

I use an Electroline 2800 8 port. It goes to 1000 mhz and I still get planes on 1090.00

https://www.multicominc.com/wp-content/uploads/Electroline-DROPAmp-Datasheet.pdf

Oh Good!!!
Do you still get good range?
Also, From antenna to SDR it will be 100ft total distance for all but the ADS-B that is on my Py.
Should the coupler be closer to the antenna or is middle fine? It will all be LMR400 just cause...

 

[ExportEh]

Would this do the trick?

https://www.amazon.ca/Extreme-Broadband-IPA1008D-RSVF-Way-Splitter/dp/B00JCJAKVE/ref=sr_1_63?crid=1MX8M89PAGG25&keywords=cable+amplifier&qid=1704492848&refinements=p_85%3A5690392011&rnid=5690384011&rps=1&sprefix=cable+ampli%2Caps%2C133&sr=8-63

Not much in Canada that I don't have to wait several weeks for.

 

[Ubbe]

Would this do the trick?

It got 8dB noise. It would be equal to having a $10 1-4 splitter without any kind of amplifier.

If you use RG6 as coax to the discone it will attenuate 10dB to a 1090Mhz signal if the coax are 100ft long. For 50ft it will be 5dB and that are probably acceptable for a $15 coax. For a LMR400 coax it would be a 2dB loss at 1090 and 50ft for a $90 coax.

If all signals are strong and 1090 reception are fine as you have it now, then a distribution splitter that has less than 5dB noise will probably do.

If you really want to receive as much as possible at 1090 and have some weak signal system that you want to receive, then for future proofing I would put a FM broadcast filter and a low noise amplifier at the antenna and then power the amplifier from the coax, that can be a cheap RG6 type, and have a passive 1-8 splitter at the receivers. The splitter might be enough to lower the signal to a good level, I use a 1-6 splitter and don't need any additional attenuation. But if you have an amplified splitter you have to reduce the signal by some attenuation, maybe 10-15dB that will depend of what a receiver can handle. For 1090 I have a 1090 SAW bandpass filter and then I can have full 20dB gain to a RTL-SDR dongle from a 6dBd gain 1090 antenna.

If you use a 1dB noise amplifier at the antenna it will give a better signal using RG6 coax and a 5dB noise splitter than LMR400 and a 3dB splitter like a Stridsberg. When amplifying a signal using a 1dB noise figure it will overcome the 2dB and 5dB loss and noise figures in the rest of the antenna system, as well as any noise figures in the receivers that are usually up to 6dB. For weak signal monitoring it would be a good investment, the amplifier are just $20-$30 and some additional filters like FM broadcast can also be added and going from LMR400 to RG6 will pay for that.

/Ubbe

 

[ExportEh]

It got 8dB noise. It would be equal to having a $10 1-4 splitter without any kind of amplifier.

If you use RG6 as coax to the discone it will attenuate 10dB to a 1090Mhz signal if the coax are 100ft long. For 50ft it will be 5dB and that are probably acceptable for a $15 coax. For a LMR400 coax it would be a 2dB loss at 1090 and 50ft for a $90 coax.

If all signals are strong and 1090 reception are fine as you have it now, then a distribution splitter that has less than 5dB noise will probably do.

If you really want to receive as much as possible at 1090 and have some weak signal system that you want to receive, then for future proofing I would put a FM broadcast filter and a low noise amplifier at the antenna and then power the amplifier from the coax, that can be a cheap RG6 type, and have a passive 1-8 splitter at the receivers. The splitter might be enough to lower the signal to a good level, I use a 1-6 splitter and don't need any additional attenuation. But if you have an amplified splitter you have to reduce the signal by some attenuation, maybe 10-15dB that will depend of what a receiver can handle. For 1090 I have a 1090 SAW bandpass filter and then I can have full 20dB gain to a RTL-SDR dongle from a 6dBd gain 1090 antenna.

If you use a 1dB noise amplifier at the antenna it will give a better signal using RG6 coax and a 5dB noise splitter than LMR400 and a 3dB splitter like a Stridsberg. When amplifying a signal using a 1dB noise figure it will overcome the 2dB and 5dB loss and noise figures in the rest of the antenna system, as well as any noise figures in the receivers that are usually up to 6dB. For weak signal monitoring it would be a good investment, the amplifier are just $20-$30 and some additional filters like FM broadcast can also be added and going from LMR400 to RG6 will pay for that.

/Ubbe

Thank you for all that great info. Not going to lie, being such a newb, some of that is over my skill set to know what I need to buy. I fully understand keeping the db as low as possible. So my above option is out.
Now, you mention running RG6 straight from the antenna. My discone is a Type N connector. If I get an adapter, would that negate the worthiness of the change?
There's so many options, it's really hard to know exactly what to buy.