Recent content by Captain Midnight

  1. Captain Midnight

    8ft SAMI Re-homed! Pulling in FTA on 43w-133w

    Oh, and I must say, this dish is actually only 7.5' in diameter. I thought it was 8ft because I laid the tape measure along the dish surface when I first measured it.
  2. Captain Midnight

    8ft SAMI Re-homed! Pulling in FTA on 43w-133w

    Just thought I'd give and update. With warmer weather and time off for COVID-19, I had a chance to make some adjustments to my feed and put on a new LNB cover. I really focused an getting my f/d setting and focal distance just right. Trial and error for a couple of hours seems to have...
  3. Captain Midnight

    question about F/D

    I know you are referring to Arlo's photo, but I will say I am measuring my focal distance based on the distance from the center plate to 1/4" inside the feedhorn +1cm to account for the center plate being flat and stopping my measurement from the true vertex of the parabola. I also add that...
  4. Captain Midnight

    question about F/D

    That's interesting. I have very good signal reports as is, so I'm not looking to totally overhaul anything right now. But it gives me food for thought. I have 12.8dB on 105w NBC feeds, 14.7dB on CTV (107.3w), 15.1dB on 97w CBS Encoder (4120V), and 16.1dB on 97w (3940H). When I changed my LNBF...
  5. Captain Midnight

    question about F/D

    I just wanted to chime in with my results of fiddling with my feed. I'll post my calculator results, but my focal length was 85.4cm instead of the 85.9cm the calculator gave me. So 0.38 didn't work nearly as well as the 0.40 setting. I figure this is because it offsets the 0.5cm that I am...
  6. Captain Midnight

    older dish mover

    If it runs, you can find a way to move it... I know guys who have used model train power supplies to move dishes. I use an old 80s mover without the sensor wired in. I just move it by pushing the button east or west. You need a 36 V power supply to move to as quick as possible.
  7. Captain Midnight

    question about F/D

    Now that I think back on my geometry and calculus, what I am really asking is whether dishes are sized strictly by diameter or by the length of the parabolic curve? That might better define the question. I do understand that f/D is calculated strictly with Diameter.
  8. Captain Midnight

    question about F/D

    Ok, so by definition is my dish 7.5ft instead of 8ft? I rather be sure of my equipment. It is a SAMI dish. I tried searching here for proper dish sizing, but most threads were for Ku reflectors. tek2000 doesn't even state how they size their 8ft mesh in the product description...
  9. Captain Midnight

    question about F/D

    Now before I get myself totally screwed up, the diameter measurement used is straight across the dish width, and not a measurement of the curved surface of the dish from rim to rim? My dish diameter straight across is 7.5' but the curve is 8' rim to rim. I receive 133w to 43w as it is, so I'm...
  10. Captain Midnight

    question about F/D

    Yes, I know the old days involved a lot of iffy assembly, but analog was so forgiving. I will think of something. I noticed that the tek2000 guide to feed assembly mentions adding 1/2" to your focal length measurement if your dish has a center plate. Mine does, so when I add the 1/2"...
  11. Captain Midnight

    question about F/D

    And in assembling the dish, the feed arms should always attach to the rear of the scalar ring, and not the front, correct? I just want to confirm. My dish was found with the arms attached to the front of the ring... When I assembled the feed arms with them attached to the rear, my focal...
  12. Captain Midnight

    More locals with a BUD ?

    I recommend a Gray-Hoverman antenna for UHF now that UHF TV only goes up to ch 36.
  13. Captain Midnight

    More locals with a BUD ?

    I know a guy who salvaged an old 10ft mesh dish and put in 1x2" paneling for a less wind loaded dish on his 40ft tower. He's even got it on a big HAM rotor for DXing. He uses a 2-bay bowtie at the focal point.
  14. Captain Midnight

    question about F/D

    Not to resurrect an old thread, but I am using the calculator to make sure my feed is at the right height. For focal length, do I measure from the center of the dish to the front of the scalar ring or to the opening of the LNBF with it set to the f/D given by the calculator? I want to fine...
  15. Captain Midnight

    11ft Fiberglass Dish - Star View Systems

    That's my fear with this. By no means do I plan to track much of the arc with something so heavy, but it would be nice for a fixed spot that my 8ft struggles. I noticed the frame just has pre-made holes for setting declination, so I figure I might be lucky to track any more than 20 degrees...
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