Here is the procedure for checking your Polorotor
If you find that the servo motor seems to be buzzing
all of the time or if you are watching a program that seems to fade out
intermittently and will come back by itself or if you change the channel up
or down and back, the problem is also likely to be a bad servo motor. But
try these steps to determine if the problem is more serious:
During my test the first decision I made was not to even bother hooking up the unit to my Drake 1724 c-band analog receiver. The sad truth is that so few analog channels remain that hooking the unit up was not even worth considering. My Drake 1724 is now 14 years old ,rebuilt once and is now the dish mover for my 12' c-band dish . However the Drake is not ready to be sent to "The Valley of Unwanted Toys" yet and with a new Von Wiese heavy duty mover installed this spring I hope to see many more years of service.
My Chaparral Polorotor 1E/A was already attached to my dish so I simply removed the old feed horn. In removing the old unit I was careful to note the f/d ratio on the old unit. I put a piece of red tape on the new throat set to the proper f/d.
|To calculate the focal distance, you have
to measure the diameter (D) and the depth (d) of the dish. Measurements
should be in like units (you can't use feet for the diameter and inches for
depth). For the example, we will say we have a dish that is 144 inches in
diameter (D) and 24 inches deep (d).
focal distance (f) equals the diameter squared (D x D) divided by 16 times the depth (16 x d) or :
D x D = 144 x 144 = 20736
focal distance f = 54 inches
After you have calculated the focal distance (f), you can use that figure to calculate the f/D ratio of your dish. In this case, using the same diameter (D) = 144; and the calculated focal distance (f) = 54
f / D = 54 / 144 = .375
The list below shows how far the throat is out from
the scalar rings for different f/D settings.
Inches -- f/D
The BSC621/2 was inserted into the scaler ring set to polar axis using the T5 satellite which is dead south here in Winnipeg..The unit was hooked up, I went inside to start scanning with my Viewsat Ultra. KCSG St. George,UT 3919 V 1962 3/4 was entered and scanned . I came back with a Quality of about 88 .
Next check T5 ku for international channels.. In Winnipeg 11836 V 20770 3/4 has a hot signal it is always a logical starting point for any T5 project.. I set up these values on the Viewsat Ultra. Usually you need to bump the over a bit off your c-band target--a couple of clicks and I had a reasonable signal. Q35. I went back to the dish twisted the unit about +/- 5 degrees off polar axis to get the maximum signal strength. I did a complete scan frequency by frequency rather than a pure blind scan. T5 has a wide variety of signals and I could not pull the weak transponders 11874 .
For $59 it is an excellent replacement unit. A Viewsat receiver and the BSC621/2 can put new life into your old dish.