[Premium-Rx] FS: HF RECEIVER MULTICOUPLER (FROM DRAKE7-LINESTATION)

[Michael O'Beirne]

Dear Clemens

Thank you for your email tonight.

I agree entirely with your maths, but in some circumstances the much higher 
port- to-port isolation of the hybrid may not be needed, for example using 
two receivers at widely spaced frequencies in contrast to, say, critical 
receiver testing for IP3 where you need to achieve the maximum isolation 
between the two RF signal generators.

73s
Michael
G8MOB

----- Original Message ----- 
From: "Clemens Paul" <cpaul at gmx.net>
To: "Michael O'Beirne" <michaelob666 at ntlworld.com>
Sent: Tuesday, April 24, 2012 6:58 PM
Subject: Re: [Premium-Rx] FS: HF RECEIVER MULTICOUPLER (FROM 
DRAKE7-LINESTATION)


> Hello Michael,
>
>>A resistive delta or splitter can be built even
>> more cheaply for the cost of 3 resistors, 3 BNCs and a small metal box.
>
> This is really a cheap solution, but also in terms of performance.
> 3dB more loss than a 3dB hybrid splitter and what is much more important,
> the resistive splitter has a poor port isolation of only 12dB while a good
> 3db hybrid splitter/combiner offers ~35dB.
>
> 73
> Clemens
> DL4RAJ