Combining 2 antennas into 1 or visa versa

[SweetPea11]

@abcd567

I think me and you are saying same thing, but in a different way, causing communication problem.

I think the problem arose when @Nitr0 said and was then contradicted.

@Nitr0

This is the unit I personally use on my test rig:

minicircuits.com

ZAPD-21+.pdf

233.95 KB

You can usually find them on Ebay for ~$20-25 (or less depending on how patient you are.)

Must also bear in mind that using a power combiner/splitter is not free. Be sure to add +3db loss to whatever is published since splitting a signal also halves it

If you look at the link he provided the spec sheet says low insertion loss, 0.25 dB typ

@abcd567 then contradicted saying

@Signal combiner for two Pi's one antenna ADS-B Flight Tracking

Practically there is an additional internal loss of about 2 to 5 dB depending on quality of the splitter. Hence: insertion loss = splittig loss + internal loss = 3 dB + 2 to 5 dB = 5 dB to 8 dB

That is the internal loss or insertion loss is 8 to 20 times (in dB) worse than the specs quoted by the manufacturer.

This has never been clarified so stands as the statement that created the following discussion.

@wiedehopf

Just to unstir the pot a bit:
He was talking about really bad splitters.

Unfortunately, that was not made clear at the time and @abcd567 referred to a particular splitter quoted in a specific post. The manufacturer quoted 0.25 dB but the quote said Practically there is an additional internal loss of about 2 to 5 dB depending on quality of the splitter.

As I pointed out in another thread incorrect information needs to be removed so that it doesn’t become fact and quoted well into the future.

S

edit: just fixed a spelling error.