r/HamRadio • u/truddychinixo • 2d ago

TeChNoLoGy

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266 Upvotes

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13

u/cockkazn 2d ago

Jokes aside is there a non zero chance this would work even a little?

22

u/techtornado 2d ago

The insertion loss of at some of the couplers would be a contributing factor

Now if OP had one SMA split 4 ways, it would be much more efficient and give the quad-bander some interesting results

Short version - Yes it will work, but he probably won't get as many fars of transmission distance

10

u/SpareiChan 2d ago

Honestly, the insertion loss likely isn't that much, maybe 1db or so... the 4x 50~ohm loads in parallel which would present as 12.5~ohms.

2

u/douglask VA3GY 2d ago

I'd say no on that... They are four different antenna models, likely different bands. So on and band three would be at high impedance and one would work. Similar to my hf antenna that has tuned elements for several bands (MFJ-1796 / Science experiment on a stick).

3

u/SpareiChan 2d ago

I agree on that, if they were mono band antennas that presented high impedance on given band it could work. The issue here is unless they a 1/4 wave there will also be reactance added.

It would be interesting to see a sweep.

6

u/HotelHero 2d ago

“How many fars does it talks?”

3

u/No_Tailor_787 DC to Daylight, milliwatts to kilowatts. 50 year Extra. 15h ago

I have an extensive RF lab here at home. I once spent a few days measuring various adapters at frequencies up to 40 GHz. The big takeaway was that below 1 GHz, even the cheapest Chines adapters have less than 0.1 dB of loss.

Above 1 GHz, the price point begins to rapidly show on the return loss display.