This is the area where we tweak various dish feeds and make preliminary adjustments to some of the smaller microwave antennas. This picture shows our 5 and 10 GHz dualband feed getting tuned up in fine style. It actually takes both test sets to accomplish this job effectively. The leftmost unit, an 8350B sweeper and 8656A network analyzer, are tuned to 10,368 MHz and measure 10 GHz return loss and port isolation simultaneously. The 8753D network analyzer on the right, is used for measuring the 5.7 GHz return loss of the feed, so that no unit needs to be reprogrammed or retuned during the test.
In the background, is our trusty 8970A Automatic Noise Figure tester. It can measure receiver performance from HF up to 26.5 GHz. The keyboard is used for annotating the screen while plots are being saved.
Another view of the same setup, showing the Dualband feed (DBFEED) in better detail. On the screen, you can just make out the isolation trace with the null sitting right at 10,368 MHz. The sweeper and network analyzer are both HPIB controllable, making testing much more accurate and effective. The HP Sweeper is quite accurate, and within 1 or 2 MHz of 10.368 GHz after a 1/2 hour warmup.
This shot was taken in the NEW and IMPROVED Directive Systems Laboratory. Actually, it is the first Directive Systems Laboratory, since there was no room for one before. The modified W5LUA feed operates on 5760 and 10,368 MHz at the same time. The two network analyzers have their own plotter to record the data to a hard copy. In addition, the newer HP (Agilent) 8753D has provisions for saving to disk or to a laserjet printer. Life is good! Not shown in the picture is a large storage area where stock is stored along with test antennas and associated equipment for measuring antennas outdoors on our test range. There is still some work required in the lab. Shelving for the lab benches and a small amateur radio station are planned.
"BAD FOR BUSINESS"
WHY WE TRY TO KEEP THE BEAGLES OUT OF THE SHOP
We have tried to train them to make power dividers, but, so far, their results will not pass our VSWR tests!! They also try to drink the solder flux.