[TowerTalk] Loss in Coax Switches ?

tttt ccccc k3hx@juno.com
Tue, 22 Jan 2002 22:56:06 -0500


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