[R-390] multiple receiver coupler

[Bob Camp]

Hi

A 1 in 4 out passive splitter will only have 6 db of loss. I’ve seen “low noise preamps” that have 6 db noise figures at HF. 

Advantages of passive:

1) Cheap on the auction sites (< $40) made by Mini Circuits.

2) Pretty much immune to overload  / lightning (Don’t transmit through them …)

3) No power to mess with and add a ground loop.

2) Pretty much no 2nd or 3rd order IM or harmonic distortion

Disadvantages of passive:

1) May / may not have as much isolation

2) Noise figure may not be as good.

3) Not as cool. 

I’m not at all suggesting there is only one way to go here. Only that there is a choice.

Bob

> On Jan 18, 2015, at 8:46 PM, Mike McCauley <mlmccauley at att.net> wrote:
> 
> 
> As I recall, this topic has been addressed here before, but evidently I did not save those threads.
> 
> I'm interested in buying/building a 1 in >=4 out receiver coupler, HF only, receive only, >=0dB gain per port relative to the incoming antenna signal.
> 
> I'd greatly prefer broadband, but I could live with tunable if that's the only practical way to go.
> 
> As I recall (???), such units have existed in the mil surplus market, but they are very rare today.
> 
> I'd be happy to build something, either tube or solid state, if anyone has a know-good design.
> 
> Any and all advise will be welcomed.
> 
> Thanks in advance for the help!
> 
> Mike, WB5MYY
> 
> 
> 
> PS - If you get a dupe post on this, my apologies, I had an email client glitch.
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