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  1. polgyver

    What Happened to Everybody?

    There is still another reason : ageing (and increased disability). I find that, due to peripheral neuropathy, I can not walk too far nor stand too long - therefore my tinkering possibilities are diminished.Completing any project (which requires using tools and sometimes machinery) is much more...
  2. polgyver

    Old Ariza 120 cm dish gets new elevation system

    It took me quite a long time to complete this project, partially due to my health issues. As I got rid of original brackets, initially I made adjustment of two 1/4" rods and plastic semi-circles. But it was cumbersome to adjust. A few months ago I decided to try to build something better. I used...
  3. polgyver

    Inexpensive HD receiver from Amazon

    I intended to upload photos in the same order as I made them, but, somehow, my option to upload was changed. Now I will add remaining 6 photos:
  4. polgyver

    Inexpensive HD receiver from Amazon

    During last few months I received telephone calls from friends and other people who used to have old sat receivers and presently can not watch their TV since their programs are now broadcasted only in HD. Typically, my advice was to buy newer receiver and program it. For some people, programming...
  5. polgyver

    Unusually high (and misleading) indicators of "S" and "Q" on some transponders

    Some time ago I tried to get programs using undersized (for FTA) dishes like Bell 18" and Bell 20" just to learn if small dish can still be utilized. Programs from Hispasat 30 W typically showed "Q" just above 40% and slightly turning the dish sideways allowed watchable program when "Q" was...
  6. polgyver

    Inaccurate description of receiver on e-bay results in unnecessary purchase

    Seller offered $ 16 USD refund, which I accepted. Saved myself the hassle to pack up and pay for shipment of this receiver. But other purchases went even worse... I ordered 2 receivers (with name Koqit) from other sellers. Assuming that these were satellite receivers. After they shipped, I...
  7. polgyver

    Inaccurate description of receiver on e-bay results in unnecessary purchase

    Some of my friends asked me to buy for them newer satellite receivers as their favourite broadcasters moved to HD and they were unable to scan and watch their programs on their older receivers. I tried to help them and searched e-bay for inexpensive SATELLITE receivers. I ordered one of them...
  8. polgyver

    Best LNB and Bracket for HughesNet 90cm Dish

    Thank you, RimaNTSS for valuable info, today I learned a lot... I took a screenshot from the link you provided, and now I am a believer, yes, the SMW-OA - 1600 can illuminate a long strip of possible 9 LNBS's, because, it is L-O-N-G ! more than 5', like 1.6 m ! And tall, almost 4' (1.1m). With...
  9. polgyver

    Best LNB and Bracket for HughesNet 90cm Dish

    I am curious how these 2 dishes reflect and focus Sun light, using small mirrors placed on them. Do they produce 2, or more light circles - separated as to illuminate more LNBS's? Or, they provide just an elongated, say, 4" to 8" (10 to 20 cm) long strip of reflected light, 1" or 2 cm high...
  10. polgyver

    Best LNB and Bracket for HughesNet 90cm Dish

    With due respect, I am not sure if single reflector dishes can be designed as multifeed. True multifeed dish was Wave Frontier, size 55 cm or bigger, 90 cm, its TWO reflectors were not paraboloid. Designed allegedly by North Korean engineers co-operating with Russian engineers. I believe all...
  11. polgyver

    Unsuccesful attempt to receive satellite signal behind a window

    Some time ago I was able to receive FTA satellite programs after reflection from mirror and with setting up a dish inside a room. However, the particular window in this room was older than the other windows. I was curious if newer windows have different glass, namely very thin, invisible layer...
  12. polgyver

    Question about dish's selectivity regarding reception of close satellites

    This was my initial suggestion submitted in my original post. I asked for other Members' opinion, and they stated that the dish's selectivity depends on its diameter: the formula (equation) in Wikipedia for "angle of view" = theta, contains no focal length as a factor. I disagreed, but recently...
  13. polgyver

    Receiving programs from 30 W = Hispasat after reflection from 2 flat mirrors.

    The advantage is very limited, I agree. A small percentage of satellite hobbyists has home or, more often, cottage surrounded by high trees, and such situation requires installation of a dish far away - and long run of RG6 - sometimes in stoney ground. Instead, a flat signal reflector could...
  14. polgyver

    Receiving programs from 30 W = Hispasat after reflection from 2 flat mirrors.

    One photo was missed:
  15. polgyver

    Receiving programs from 30 W = Hispasat after reflection from 2 flat mirrors.

    Just noticed that 10 years ago I described receiving program from Hispasat after double reflection. But then - it was just one reflector (mirror) and second reflection was, of course, from the dish... Now, I tried TWO mirrors, so, technically, it could be called “triple” reflection ? This...
  16. polgyver

    No playing with my dishes today.

    The same weather is in Toronto...
  17. polgyver

    Why some dishes were made as concentrical rings?

    Yes for optics, when the wavelength of visible light is a very small fraction of width of a ring on a lens. Such design of Fresnel Lens saves huge amount of glass for example in a lighthouse. I suspect there are losses when the wavelength of, say, 12 GHz, = 2.5 cm (or 1") is only 2 or 3 times...
  18. polgyver

    Question about dish's selectivity regarding reception of close satellites

    For sure, this is the case if the dish is a part of a sphere (like, Arecibo - this info I got from Paul Wade articles). Not sure if there were trials to combine more paraboloids of rotation into one shape, though... If there is just one paraboloid, it has only one focal spot. This thread got...
  19. polgyver

    Question about dish's selectivity regarding reception of close satellites

    and so am I. Would be nice to have sort of "satellite reception primer" - something similar for Euclid's first geometry manual. Good source is writings of Paul Wade (can be found on Google). My analogy of photo lenses was not finished, as I forgot to compare front face of LNBF to standard 24 mm...
  20. polgyver

    Question about dish's selectivity regarding reception of close satellites

    Kindly, disagree... When considering camera's lenses, things are obvious, that lenses with long focal length (telephoto) "see" much narrower field than wide-angle lenses (with short focal length). Wikipedia, indeed, does not show in the equation any focal length. I think there is a similarity to...
  21. polgyver

    Why some dishes were made as concentrical rings?

    Going through my saved photos I noticed some pictures showing experimental satellite dishes made from stepped-up rings. I am curious why anybody would attempt to build such devices. The electromagnetic waves, reflected from different rings, most likely would interfere and cause possible...
  22. polgyver

    Primary dish 10 m from home, secondary dish in the room

    I can control the focal length from 8 m to 15 m or more, by turning a bolt located on the lever which pushes the microswitch controlling the vac pump. But the "focal cloud" is always 4" and more, not concentrated enough to drive directly LNBF (various scalars did not help). That's why I needed...
  23. polgyver

    Primary dish 10 m from home, secondary dish in the room

    From the beginning I was aware of 2 flaws in this idea: 1. A mirror with an underpressure will take shape of catenoid, not paraboloid (some sources on Internet claim the shape would be part of a sphere, but I doubt it) 2. The reception and following reflection of signal will be off-axis...
  24. polgyver

    Primary dish 10 m from home, secondary dish in the room

    The idea is to use slightly concave surface for preliminary increase of signal strength and sending it as a converging beam through the window and finally receive program using miniature secondary dish. I spent many months trying reception with small, 8" secondary dish, but was not successful...
  25. polgyver

    Question about dish's selectivity regarding reception of close satellites

    A few months ago I found interesting article by John Legon, mostly known as a mathematician researching Egyptian Pyramids. John also is involved in satellite reception and devised some equations for finding parameters of unknown dishes. I took a screenshot of part of his article. What is...
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