Here are some measurements I made on 3 coaxial switches.
I used a venerable HP 3677 and performed the tedious "full port cal"
before each
device was tested.
#1 Alpha-Delta Delta-4 UHF connectors
Thru loss 30 mHz 50.1 mHz 146.52 mHz
Common-1 .019dB .026dB .11dB
Common-2 .024dB .037dB .13dB
Common-3 .017dB .036dB .15dB
Common-4 .020dB .026dB .11dB
Isolation between any 2 ports at 146.52 mHz over 60dB
#2 Diawa CS-201 UHF connectors
Thru Loss at 146.52 mHz
Common-1 .117dB
Common-2 .2 dB
Isolation from unselected port at 146.52
Common-1 73dB
Common-2 76dB
#3 Barker & Williamson 5 position rotary, 6 UHF connectors on a
hexagonal aluminum box (model number
obscured)
Common-any port 30 mHz 50 mHz 146.52 mHz
Thru loss .001 dB .3 dB .05 dB
Isolation 40 dB 37 dB 27-30 dB
I was surprised at how well the B&W switch performed.
73
Tim K3HX
________________________________________________________________
GET INTERNET ACCESS FROM JUNO!
Juno offers FREE or PREMIUM Internet access for less!
Join Juno today! For your FREE software, visit:
http://dl.www.juno.com/get/web/.
________________________________________________________________________
Where do you get ICE bandpass filters & beverage matching boxes? The
same place that pays for the hosting of this list: The eHam Store.
Order online at http://store.eham.net.
-----------------------------------------------------------------------
-----
FAQ on WWW: http://www.contesting.com/FAQ/towertalk
Submissions: towertalk@contesting.com
Administrative requests: towertalk-REQUEST@contesting.com
Problems: owner-towertalk@contesting.com
|