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GeeZer

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Reply with quote  #1 
I run/jog by a house in the neighborhood that has a nice looking 8 foot mesh dish.  The house was rented, but now it's owned and the owners are cleaning up the yard.  I doubt they have any interest in the dish and thought about hopefully making a deal on it.  I have a 6 foot solid for ku, but thought this might be somewhat of an upgrade.  Does anyone use one similar for ku or for C for that matter.  Does it do decently on C band?  How does it compare to a smaller solid dish for ku.  Thanks!
Captain_Kurtz

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Reply with quote  #2 
Assuming both dishes are in good shape (not warped or dented),
a solid 6' dish will outperform an 8' mesh dish on Ku all day.
Even in perfect shape, a mesh dish simply isn't as parabolic as a solid dish - the mesh is flat between ribs.
An 8' mesh dish however should do well on C-band.
Your 6' solid as a Ku-only dish and the 8' mesh as C-only would be a nice set up.

cpsp0

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Reply with quote  #3 
I used to have a 7.5 foot mesh dish and it did good on Cband, not great. It was iffy on the G125 wildfeeds of the Cubs games, but preformed well on 107W where a lot of the NFL games are shown in Cananda and also preformed well on 99W to 87W. 

I had a KU sidecar on it and it was pretty good. I got the Cubs games on WLS on 91W. 

So a 8-foot mesh should give you good reception, because it has more area than a 7.5.


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GeeZer

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Reply with quote  #4 
Thanks for the replies...I do have a 12 foot for cband, but the 6 foot is pretty much no good as an extra cband dish.  Hence changing out the 6 foot solid dish for an 8 foot mesh dish would give me more choices on Cband without adding another pole.  Just a swap out of the mount and dish.  The 12 foot works well on ku except on windy days.
Voltaic

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Reply with quote  #5 
I use a 7.5' for both C and Ku and it's serving me well enough... I obviously don't get *all* feeds that pops up but do get most.
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C-band: 7.5' Perfect10 / Pansat DP-4 Feed / 2x Norsat 3120F & 2x Zinwell PLL
Ku-band: Prodelin 1.8m Rx/Tx Future Project / RC2KA
Switches: WNC-4x8 / EMP 4x1 DiSEqC
Tuners: TBS6925, TBS6902, TBS5022SE, DSR-6000, Scopus IRD-2900, Cisco D9854

OTA: CM4228 / CM7777 / HDHomeRun EXTEND
Captain_Kurtz

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Reply with quote  #6 
That 6' solid dish could be an excellent Ku-only dish with a prime-focus C-120 Ku feedhorn and universal LNBF.
rikoski

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Reply with quote  #7 
I have a 6' sold dish that I bought from Jamal Sadoun parked on I21 feeding an Icecrypt for C Band reception of NHK, France 24, China and the Kore
an news stations. Works fine for its intended purpose.
bigdish3

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Reply with quote  #8 
If it is a solid dish and you have a clear sight to the sky you should be good.. Take a picture of the dish and post it.
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Captain_Kurtz

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Reply with quote  #9 
Right, I forgot about those stamped metal sectional Chinese dishes sold by Sadoun and others.
Adequate results for C-band, but I wouldn't bother trying to use one for Ku.
rikoski

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Reply with quote  #10 
Kurtz: Do you have some experience with this particular dish that you might share with the group?  They worked perfectly fine for me for 3 years on Ku and C in Wilkes Barre; a location off the US boresight.
Captain_Kurtz

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Reply with quote  #11 
Yes, I have both a 5' and a 6' stamped metal sectional dish.
The 6' is a Winegard; don't know if they actually manufactured it, or just put their name on it.
The stamped metal panels are somewhat flat like a mesh dish.
They aren't as parabolic and don't hold their shape as well, and thus don't perform on Ku
as well, as a spun or hydroformed solid metal dish, or a solid fiberglass dish.
Perfectly adequate for C-band but less than ideal for Ku.
Captain_Kurtz

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Reply with quote  #12 
This thread got me to thinking about the effect that dish accuracy must have on the phase coherence of the received signal.
With the switch from analog to digital, and then from DVB-S to DVB-S2, and ever higher modulation schemes (8PSK, 16APSK, and 32APSK), low phase noise and high phase accuracy becomes increasingly important.
I have to think that the less your dish is perfectly parabolic, then the less tightly focused the received signal will be, and the dish itself will be introducing phase noise, because the signal arriving from different sections of the dish will be arriving at the focal point out of phase due to the discrepancies in path length, in addition to the lower gain you will get from a less than parabolic dish.
This is the reason that I wouldn't consider using a mesh dish or a stamped sectional metal dish for Ku.

boblop

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Reply with quote  #13 
Keep in mind that a Ku feed wave guide is about 3/4 of an inch wide. It takes a good quality dish to get most of its found signal focused and into that little 3/4 inch hole. Unless it gets "in the hole" the lnb will never ever see that part of the signal.
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GeeZer

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Reply with quote  #14 
It's a Sadoun like dish, my 6 foot.  I have had a little problem with alignment, but won't blame the dish.  Have used a Sadoun and it worked pretty darn well in the past.  Had just wondered about the 8 foot since it looks so lonely in that yard and appears in pristine condition.  It would compliment the 12 footer on C band as well since the 6 foot is useless on C band.  Boblop, where are all these "high quality" dishes?  It's getting hard to find dishes period.
boblop

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Reply with quote  #15 
The "good stuff" is up on the roof of many commercial businesses. My 1.8 meter free fixed dish turned into my 3 motor dish. Over a little time and a few changes the 1.8 meter dish turned into a real joy to use and tune. No tracking but rather just motor over to the correct position and skew with push buttons from the easy chair! (research concepts 2000 model 3 motor controller) Any dish which from the original design that was used to receive and "transmit" will be a great home hobby FTA Ku dish. But just try out the dish you have and see what happens.

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Fellow Members, your posts are welcome here! Do not worry about posting everything perfect. Different receivers and LNB's will give you different Frequencies and Symbol Rates. Some set top boxes, PCI cards and USB receivers, Do Not Require all of the same information that others may need. It is not Required to post everything that others may need to tune in a feed. It is just most important to share the find. We can always adjust the Frequency and Symbol Rates and try the various Modulations and FEC's on our own receivers until we get a lock and then give a polite reply with what works for your receiver, as that information might help others as well. We all appreciate the efforts and energy of the Posters!

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