[Elecraft] OT: 2 port 50 ohm RX splitters ---TNX

[Jack Smith]

I would note that if you intend to use combiners with signal generators 
for intermodulation measurements care has to be taken with core 
selection if high performance amplifiers are to be evaluated.

After a great deal of experimentation, the limit of my 2nd and 3rd order 
IMD measurement capability is > +100 dBm (2nd order) and > +55 dBm (3rd 
order) but that required evaluating a half dozen or more 3 dB combiners 
and quite a few other components as well. The best of my Norton 
amplifiers press against these limits.

Some discussion and measured data for various 3 and 6 dB combiners at my 
web site:
http://www.cliftonlaboratories.com/6_db_hybrid_combiner.htm
http://www.cliftonlaboratories.com/Documents/Notes%20on%20Building%20a%20Z10050A.pdf

I've modified my test equipment setup since the first page link was 
written - presently use a pair of HP 8657A signal generators and an HP 
8568B spectrum analyzer.  But the ZHL-3A amplifiers remain in use and 
are essential.

Jack K8ZOA

On 1/1/2014 9:35 AM, Joe Subich, W4TV wrote:
>
> Jack Smith has a kit - everything except case and connectors:
>   http://cliftonlaboratories.com/z10050a_3_db_hybrid.htm
>
> 73,
>
>    ... Joe, W4TV
>
>
> On 1/1/2014 9:15 AM, alsopb at nc.rr.com wrote:
>> Thanks guys.  Looks like the W8JI design is easiest to build.
>> Mouser has the binocular cores needed.
>>
>> 73 de Brian/K3KO
>> ---- alsopb at nc.rr.com wrote:
>>> A while back there were some postings on recommended commercial 50 
>>> ohm two port splitters for receiver use.
>>>
>>> Can't find the postings.  Cheaper is better.  Loss for my 
>>> application is relatively unimportant since they will be signal 
>>> generator driven and followed by step attenuators. Simple HB designs 
>>> may also be of interest.  Kits would be ideal.
>>>
>>> Of course the K3 has one built in to route the main RX antenna to 
>>> both the main and sub rx.
>>>
>>> 73 de Brian/K3KO
>>
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