[TenTec] Orion antenna isolation measurement

[Bill Tippett]

KH7T:

 >On my Orion, I measured the following isolation between antenna ports 1
and 2.
I fed Antenna port 1 with an HP generator with a calibrated attenuator.
I set the signal at S9.
Then I switched to Antenna 2 and increased the signal level until I got
S9 again
28.5 MHz, 40 db,  Antenna 2 open
3.888 MHz, 45 db, Antenna 2 open
3.888 MHz, 50 db, Antenna 2 terminated with 50 ohms

         Very consistent with ARRL's Expanded Test Report below.

                                         73,  Bill  W4ZV

Test Description: This test measures the RF isolation between the 
active (selected) antenna port and the other available antenna ports. 
This isolation can be important where the unselected port is 
connected to an antenna that is resonant (or near resonant) on some 
of the same frequencies as the main antenna. Isolation of 60 dB or 
better is considered good.

Test Results (isolation at 14 MHz):

ANT 1 selected ANT 2 unselected - 42.3 dB
ANT 2 selected ANT 1 unselected - 51.4 dB

(from ARRL Expanded Test Report on Orion page 15)