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Hillybilly DirecTv HD dish

Discussion in 'DIRECTV Installation/MDU Discussion' started by Davenlr, Jul 14, 2011.

  1. P Smith

    P Smith Mr. FixAnything

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    If you would post the math ...

    If you increasing 2x time surface ie diameter increased 1.4x you could got 3 dB gain theoretically (usually efficient of such dishes is 75%), practically 2 dB.
    If his reflector has increased 2x diameter, then in theory - 6 dB, practically 4.5 dB.
     
  2. veryoldschool

    veryoldschool Lifetime Achiever Staff Member Super Moderator DBSTalk Club

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    I used:
    1.2 meter = 46.8" = 1720.21 square inches
    Slimline being oval, I approximated it at 28" = 615.75 square inches.

    The 1.2 meter has 2.79 times more area.
     
  3. Davenlr

    Davenlr Geek til I die

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    I used a AT9 mount. Fta dish has its own lnb arm. I drilled holes in the fta dish to match the bolt pattern on the mount. Lnb had to be strapped to lnb mount due to its size.

    You could use the fta mount, but the don't have fine
    tuning.
     
  4. doctor j

    doctor j Hall Of Fame DBSTalk Club

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  5. P Smith

    P Smith Mr. FixAnything

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    Well, now we need to find out why it got +7.2 dBm ?

    I got some idea if there SNR increased too, not sure if the 'buddy' display combined values...
     
  6. veryoldschool

    veryoldschool Lifetime Achiever Staff Member Super Moderator DBSTalk Club

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    Since that is an absolute power level, not sure if it's gain, or a power level.
    Might only be a 7.2 dB gain, as I really doubt the delta would be from -15 dBm [at best] to +7.2 dBm.
     
  7. doctor j

    doctor j Hall Of Fame DBSTalk Club

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    Correct.
    7.2 dBm increase in Power.
    see excel spreadsheet referenced above:

    AVR 101 KU TPN via Pase III was -27.4 dBm
    AVR 101 KU TPN via AU-9 was -24.3 dBm
    AVR 101 KU TPN via 1.2 AH was -17.1 dBm

    Doctor j
     
  8. doctor j

    doctor j Hall Of Fame DBSTalk Club

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    If you don't want to look back here's the pertinent summary:
    Code:
    	PHASE III				AU-9				DTVAHKaKu		
    TRN	PWR	C/N 	IRD		PWR	C/N 	IRD		PWR	C/N 	IRD
    101											
    Tr 1	-29.5	13.5	96		-24.2	14.4	98		-18.9	15.7	100
    Tr 2	-25.5	15.0	99		-23.0	15.3	99		-18.7	16.7	100
    Tr 3	-30.4	12.8	94		-24.9	13.5	96		-19.8	14.7	98
    Tr 4	-30.0	5.5	34		-26.8	5.9	37		-21.1	6.4	42
    Tr 5	-29.7	13.2	95		-24.9	13.6	96		-18.8	15.1	99
    Tr 6	-26.1	15.5	100		-23.4	16.1	100		-17.3	18.2	100
    Tr 7	-29.9	13.5	96		-25.2	13.9	97		-19.3	15.4	99
    Tr 8	-25.7	15.5	100		-23.6	16.0	100		-16.2	18.2	100
    Tr 9	-29.4	13.0	95		-25.0	13.5	96		-18.1	14.8	99
    Tr 10	-24.8	15.7	100		-22.9	16.2	100		-17.1	17.9	100
    Tr 11	-29.9	13.5	96		-25.2	13.8	97		-16.5	15.5	100
    Tr 12	-31.6	0.0	0		-29.7	0.0	0		-23.0	0.0	0
    Tr 13	-29.3	13.2	95		-24.9	13.8	97		-15.8	15.2	99
    Tr 14	-24.8	16.1	100		-23.0	16.7	100		-17.7	18.6	100
    Tr 15	-29.1	13.4	96		-25.0	13.6	96		-15.7	14.8	99
    Tr 16	-23.3	16.1	100		-22.1	16.9	100		-15.8	18.4	100
    Tr 17	-29.1	13.0	95		-24.6	13.5	96		-14.9	13.7	96
    Tr 18	-19.8	19.6	100		-16.3	19.8	100		-11.9	20.6	100
    Tr 19	-29.2	13.5	96		-25.2	13.7	96		-15.6	14.1	97
    Tr 20	-27.8	0.0	0		-23.9	0.0	0		-20.6	0.0	0
    Tr 21	-28.7	13.8	97		-24.4	14.3	98		-15.5	15.7	100
    Tr 22	-23.5	16.2	100		-21.1	16.7	100		-16.2	18.6	100
    Tr 23	-29.3	13.5	96		-26.6	13.7	96		-15.3	14.4	98
    Tr 24	-24.0	16.1	100		-21.6	16.6	100		-16.8	18.4	100
    Tr 25	-29.5	13.2	95		-27.1	13.2	95		-15.8	14.1	97
    Tr 26	-23.0	13.7	96		-21.4	14.3	98		-16.0	15.0	99
    Tr 27	-29.9	13.8	97		-27.8	13.0	95		-15.6	13.7	96
    Tr 28	-21.9	17.8	100		-20.0	18.0	100		-14.4	19.3	100
    Tr 29	-29.8	13.7	96		-27.9	13.2	95		-14.7	13.9	97
    Tr 30	-23.7	16.2	100		-22.1	16.4	100		-18.0	18.4	100
    Tr 31	-31.3	13.4	96		-30.2	13.0	95		-17.3	13.7	96
    Tr 32	-26.4	16.4	100		-24.0	16.7	100		-20.0	18.8	100
    AVR	-27.4				-24.3				-17.1		
    		delta Phase III			+3.1dB				+10.3dB		
    						delta AU-9			+7.2dB		
    Doctor j
     
  9. veryoldschool

    veryoldschool Lifetime Achiever Staff Member Super Moderator DBSTalk Club

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    "For the want of" [or lack there of] a little m.
    Your excel sheet looks good.

    Since dB is dB, you meant 7.2 dB increase in power, as your highest power was -11.9 dBm.
     
  10. veryoldschool

    veryoldschool Lifetime Achiever Staff Member Super Moderator DBSTalk Club

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    Since this is greater than the gain increase due to the reflector size, I wonder if the gain of the LNB was also increased?
     
  11. kevinturcotte

    kevinturcotte New Member

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    Outside...
    Has anybody done this looking at Ka signal boost? That's really All I'm interested in anyway (VERY RARE that I record an SD channel).
     
  12. Davenlr

    Davenlr Geek til I die

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    Yea, go back and look at the Dr's XLS attachment, it has the 99 and 103 sats on it also.
     
  13. kevinturcotte

    kevinturcotte New Member

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    Outside...
    How well did the Ka signals hold up in the rain compared to the Slimine?
     
  14. veryoldschool

    veryoldschool Lifetime Achiever Staff Member Super Moderator DBSTalk Club

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    Not sure what can be made of the 99 & 103 numbers, as they look to be the spaceway birds, and maybe in the 6 dB range for gain.
     
  15. doctor j

    doctor j Hall Of Fame DBSTalk Club

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    Cut me a little slack:)
    This WAS 12/07!!

    Anyway no old meter does KA directly very well!
    I'll be glad to update equipment if anyone can give me reasonable info AND price as to how to do this again now.

    My point was that the DTVAHKAKUKIT LNB is Hotter than the AU-9 LNB, and that the DTVAH1.2MDISH is a great reflector.

    I also wanted to point out that not much in the world is new.
    I asked the rain fade question more than 4 years ago!
    The answer is bigger is better! And more complicated! And more difficult to setup and manage! And more expensive! And worth every step it takes to get there. Unfortunately the 1.2 M dish is in a closet in the basement. The Practical Factor (ie WIFE FACTOR) trumps a lot of man's wishes. A GOOD MAN KNOWS HIS LIMITATIONS. :)

    Doctor j
     
  16. veryoldschool

    veryoldschool Lifetime Achiever Staff Member Super Moderator DBSTalk Club

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    I'm glad you've re-posted this, as looking through that thread, I see some of my own fingerprints. :lol:

    Think is safe to "assume" the LNB has 3 dB more gain than a legacy LNB.

    Now with the SWiMLNB being able to add 15 dB of gain, this "Hillybilly" 1 meter dish, with a SWiMLNB might equal [maybe even exceed] your older results.

    Now your 1.2 meter & LNB + SWM8 + amp [for the splitter/coax losses] I doubt can be matched by anything else, "short of" going much larger on the dish.
     
  17. P Smith

    P Smith Mr. FixAnything

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    Nothing will beat old 'spoon' 3m dish (direct focus C-band) !:eek2:
     

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