[time-nuts] Isolation and insertion loss of Minicircuits splitters

Bob Camp kb8tq at n1k.org
Mon Jul 20 07:18:19 EDT 2015


Hi

They may be designed to be as close as you can get to a 50 ohm splitter. The
sum port is where that is most likely to fall apart.

Bob

> On Jul 19, 2015, at 10:51 AM, Dr. David Kirkby (Kirkby Microwave Ltd) <drkirkby at kirkbymicrowave.co.uk> wrote:
> 
> On 19 July 2015 at 13:39, Bob Camp <kb8tq at n1k.org> wrote:
> 
>> Hi
>> 
>> One thing worth checking:
>> 
>> The impedance at the “sum” port may or may not be 50 ohms. It’s worth
>> checking before you
>> go to extreme lengths to come up with a “perfect” 50 ohm amp.
>> 
>> ======
>> 
>> Since part of the world likes 75 ohms, it’s also worth taking a look at
>> the isolation numbers
>> with the sum port terminated in 75 (or 75 / 4) ohms. There are a number of
>> high power / low
>> noise amps out there (apparently) designed for cable distribution systems.
>> 
>> Bob
>> 
> 
> 
> These are definitely designed as 50 Ohm splitters - I have the data sheet
> on them.
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