2 radio combiner 1

[hario]

I am not sure is it ok or not? I try to combine 2 receiver signal from 2 diferrent frequency at same band. The receiving signal will go to one antenna.

 

[VEBill]

For TVs (and FM), they're called 'splitters'.

At lower frequencies (like shortwave), where reflections in the feedline might be less of an issue, you might be able to get away with less (simple parallel connection).

Can you provide more details ?

 

[IRstuff]

Why is that an issue?

Your car receiver's antenna receives something like 30 stations, does it not?

TTFN

 

[tlh0598]

You can look at multicouplers or combiners. Here is an example of a combiner for 800MHz

http://www.dbspectra.com/products/DBS-113AB/DBS-HC113T1-08F.pdf

 

[SolderingGunslinger]

It can be a problem when the local oscillators in the receiver leak a little into the antenna (I know, poor design...but some older sets...) It the Lo of one radio happens to be anywhere near a frequency of interest (or any of the mixing products, for that matter) fall into the bandpass of the other receiver, there can be interference.

When it came to radio RPU receivers, I always installed ferrite circulators on the antenna inputs to the receivers. This helped eliminate any IM products which might be generated in the receiver front end, and also prevented any Lo or IF leakage from clobbering other receivers in the area, after all, we must keep the neighbors happy as well when it comes to shared antenna sites.

I remain,

The Old Soldering Gujnslinger
I

 

[hario]

Thanks tlh0598!
You just gave me the right link.
I think I need a duplexer instead of power combiner.
I am actually designing WLAN Base Station with multiple radio. I don't want to have too many antennas. so, I combine the 2 receiver into one. And with a duplexer two channel frequency (2412 and 2462) can be combine.
So one antenna will receive 2 diff freq.

 

[Higgler]

Make sure the antenna is dual band or has wide enough frequency bandwidth to handle both signals.
kch

 

[hario]

I don't think I need dual band because those two frequency fall within the same band.