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, als...@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
---- als...@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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