Dual LNB D1 D2

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farcus

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#39831 19-Aug-2009 23:31

anybody have experience with the dual LNB that is supposed to pick up D1 and D2 on a 60cm dish?
Do they work? Easy to install?

1 | 2

20 posts

Geek

#249348 21-Aug-2009 11:06

I Have Done D1-D2 with single flat body body LNB's (and the sharp Singles) on a 60 cm dish, but on a sharp "DUAL LNB" you can't because the lnb is designed to look at 2 sat's with 4 degrees between them. With a Sharp dual LNB you can do C1-D1 or D2-C1. D1-D2 with single LNB's normal requires custom bracket, i do have measurement for the one that i made that worked with flat body LNB's or you can use one of these http://www.freeviewshop.co.nz/optus-d1d2-bracket-60cm-75cm-dishes-p-427.html these will work well with the sharp Single LNB's. Hope this helps :)

farcus

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#249352 21-Aug-2009 11:17

singingbird: I Have Done D1-D2 with single flat body body LNB's (and the sharp Singles) on a 60 cm dish, but on a sharp "DUAL LNB" you can't because the lnb is designed to look at 2 sat's with 4 degrees between them. With a Sharp dual LNB you can do C1-D1 or D2-C1. D1-D2 with single LNB's normal requires custom bracket, i do have measurement for the one that i made that worked with flat body LNB's or you can use one of these http://www.freeviewshop.co.nz/optus-d1d2-bracket-60cm-75cm-dishes-p-427.html these will work well with the sharp Single LNB's. Hope this helps :)

This is the one I was looking at that specifies it is for D1/D2
http://www.trademe.co.nz/Browse/Listing.aspx?id=237024931

Just wanting to know how easy these things are to get going. not sure I trust comments from the seller.

singingbird

20 posts

Geek

#249359 21-Aug-2009 11:29

I honestly dont know about that type of lnb, weather it would or would not get D1-D2, when i made reference to a Dual LNB i was referring to the "SKY Dual LNB's". As with all lnb's you will have to adjust the skew to get max signal quality. It is possible that type of LNB may very well do D1-D2 on a 60 cm, as you can do it with two singles so based on that i should see no reason why that particular LNB wouldn't do the trick.

kiwisat

147 posts

Master Geek
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#250801 26-Aug-2009 20:15

That LNB you link to is not worth the hassle IMHO having installed in the past. My main gripe was the inability to access horizontal and vertical pols on the LNB's and found much more control with a dual LNB setup so that individual skew of each LNB is possible.

Paul

farcus

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#250812 26-Aug-2009 20:37

kiwisat: That LNB you link to is not worth the hassle IMHO having installed in the past. My main gripe was the inability to access horizontal and vertical pols on the LNB's and found much more control with a dual LNB setup so that individual skew of each LNB is possible.

hmmm . . .
Not sure what you are saying here. Are you saying you can't view horizontal and vertical polarities on the same lnb.
I find that hard to believe.
For example - freeview on D1 is on a horizontal polarity while almost all the free channels on D2 are on a vertical polarity. Are you saying if I use the LNB to view Freeview then I wont be able to access most of the free channels on D2?

kiwisat

147 posts

Master Geek
+1 received by user: 2

#250871 26-Aug-2009 23:29

No what I am saying is that in my experience with two of these dual LNB's that the left hand LNB would only allow one polarity. I have one which I will dig out and play with, to remind me of why I didn't attempt to flick it on TM. Suffice to say it had issues, and I am an installer and retailer so do not want anything that wastes my timeor that of my customer. I will report back with results of my testing.

Paul

AliExpress

Shop now on AliExpress (affiliate link).

kiwisat

147 posts

Master Geek
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#251178 28-Aug-2009 07:30

OK it all came back to me .
This report only applies to the Zinwell ZKF-DJ21 Mono Block LNBF and the main issue being that the Horizontal and Vertical polaritiy probes are reversed, so that if you installed directly into an existing installation using the right hand LNB for D1 you would receive no signal because the receiver will attempt to access the H pol probe.
A 90 degree rotation of the LNB will give you a signal with the result that the 2nd LNB is vertically above the 1st: no use at all for D2. The only way around it is to rescan the satellite so that V and H are now reversed in the receiver and all subsequent TP's are also the opposite of what is being transmitted.

Paul

WildBill

50 posts

Geek

#251464 29-Aug-2009 02:03

Hi farcus,

Kiwisat is absolutely correct. - don't touch that LNB (Zinwell ZKF-DJ21) with the proverbial bargepole.

In the very early days (B1 & B3) when everything was vertical we had limited success with it, but once we were dealing with two different polarities,(H on D1 & V on D2) and then both polarities on the same transponder of one satellite, then it became virtually impossible to get a decent signal strength from each satellite - because you can't skew each individual LNB, so it was always a compomise.
Also the unit has a DiSEqC switch built into it which makes it a bit tricky for aligning using a meter.
Have I successfully put you off it?
Anyone who's been around for a while, (including some people who advertise on Trade-me), knows the short-comings of that LNB!

Cheers, Wild Bill.

Hamilton, NZ.

Jaxson

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Trusted

#251468 29-Aug-2009 02:35

Hi, welcome 'WildBill' from the other forums to geekzone. Your input is much appreciated here.

farcus

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#251498 29-Aug-2009 09:38

WildBill: Hi farcus,

Kiwisat is absolutely correct. - don't touch that LNB (Zinwell ZKF-DJ21) with the proverbial bargepole.

In the very early days (B1 & B3) when everything was vertical we had limited success with it, but once we were dealing with two different polarities,(H on D1 & V on D2) and then both polarities on the same transponder of one satellite, then it became virtually impossible to get a decent signal strength from each satellite - because you can't skew each individual LNB, so it was always a compomise.
Also the unit has a DiSEqC switch built into it which makes it a bit tricky for aligning using a meter.
Have I successfully put you off it?
Anyone who's been around for a while, (including some people who advertise on Trade-me), knows the short-comings of that LNB!

Cheers, Wild Bill.

Thanks Wild Bill

Yes, I have been well & truly put off the unit by a number of people now.
However, as I already have the unit up in a cupboard I'm gonna give it a try - as my expectations are quite low. I am only wanting to receive one channel in particular from D2 (NHK) so if I can' get that in addition to Freeview then in the bin it goes and I'll purchase a twin lnb, plae and switch.

Incidentally - if I was to purchase a switch for a twin lnb setup, am I better off with a 22khz switch or a DiSEqc switch?

HybridE506r

59 posts

Master Geek

#251515 29-Aug-2009 11:17

Thanks for the useful info on the dual lnb as i too have wondered about them.

Farcus, recently i bought from supreme antenna company a dual lnb bracket and lnb's for a 65 dish and a 4 x1 DiSEqC switch to allow for 2 future lnb's or another dish on the same cable. This way made it very easy to set up d1 and d2 through a topfield box, no real hassles. Maybe that way could be the simplest?

A question:
For outdoor F connections, who sells a silicon gel to waterproof/lube the weather boot and connesctions to help prevent electrolysis?

Thanks

HP

Shop now for HP laptops and other devices (affiliate link).

kiwisat

147 posts

Master Geek
+1 received by user: 2

#251613 29-Aug-2009 20:08

Hi Farcus The DiSEqc switch will give you more flexibility in the long run. Using the 22K switch limits your ability to use a Universal LNB in the system as that relies on 22K as well. And a 4 way DiSEqc switch should cost you no more than a 22K switch. Then you could put up 3 LNB's on one dish. D1,D2,I8.

Paul

bleater

58 posts

Master Geek
+1 received by user: 1

#578419 7-Feb-2012 20:41

Sorry about reopening an old topic, but this thread has pretty high pagerank for "D1 D2 mononblock LNB".

I recently purchased what was advertised as a 4° monoblock LNB to use on my 90cm offset dish. LNB is WSI Digital model ESX5421U. I use an EyeTV Sat box so I was looking for a European-style Universal LNB, i.e. 9750MHz/10600MHz LO frequency that would pick up D1 and D2. (http://wsidigital.com/ESX-LINEAR-LNB-LNBF/Ku-Band-LNBF/ESX5421U-4-degree-monoblock-Ku-LNBF.htm)

Anyway, after pissing about for a long time I can get D1 just fine, but not a sniff of D2. Now the advertising says that this is a good fit for a 90cm dish, but something didn't seem right that they could advertise this as a 4° LNB without specifying what dish that dish focal length dish it requires... so I did some measurements:
* Monoblock spacing: 54mm (measured)
* Dish focal length (i.e. from LNB to middle of dish): 24 inches / 609.6mm (specified) and measured very similar.
* By my trig calculations: tan^-1 (54/609.6) = 5.06°

So it looks like this isn't going to work!
I also had the idea of perhaps using it with an old sky dish I had (without a Sky monoblock LNB) and that wouldn't work either I reckon, since I measured the focal length of this dish at 450mm, which gives an angle of 6.8°.

Do my calculations look right?
Should I just bite the bullet and chuck this thing in the bin, or is there some reason why a 5.06° monoblock might actually work with D1/D2 spacing?

injuised

256 posts

Ultimate Geek
+1 received by user: 3

#578423 7-Feb-2012 20:48

kiwisat: That LNB you link to is not worth the hassle IMHO having installed in the past. My main gripe was the inability to access horizontal and vertical pols on the LNB's and found much more control with a dual LNB setup so that individual skew of each LNB is possible.

+1 Had the same problems, and stopped using them ,got a couple here if anybody wants one

injuised

256 posts

Ultimate Geek
+1 received by user: 3

#578425 7-Feb-2012 20:55

bleater: Sorry about reopening an old topic, but this thread has pretty high pagerank for "D1 D2 mononblock LNB".

I recently purchased what was advertised as a 4° monoblock LNB to use on my 90cm offset dish. LNB is WSI Digital model ESX5421U. I use an EyeTV Sat box so I was looking for a European-style Universal LNB, i.e. 9750MHz/10600MHz LO frequency that would pick up D1 and D2. (http://wsidigital.com/ESX-LINEAR-LNB-LNBF/Ku-Band-LNBF/ESX5421U-4-degree-monoblock-Ku-LNBF.htm)

Anyway, after pissing about for a long time I can get D1 just fine, but not a sniff of D2. Now the advertising says that this is a good fit for a 90cm dish, but something didn't seem right that they could advertise this as a 4° LNB without specifying what dish that dish focal length dish it requires... so I did some measurements:
* Monoblock spacing: 54mm (measured)
* Dish focal length (i.e. from LNB to middle of dish): 24 inches / 609.6mm (specified) and measured very similar.
* By my trig calculations: tan^-1 (54/609.6) = 5.06°

So it looks like this isn't going to work!
I also had the idea of perhaps using it with an old sky dish I had (without a Sky monoblock LNB) and that wouldn't work either I reckon, since I measured the focal length of this dish at 450mm, which gives an angle of 6.8°.

Do my calculations look right?
Should I just bite the bullet and chuck this thing in the bin, or is there some reason why a 5.06° monoblock might actually work with D1/D2 spacing?

IMO those monoblocks are all made for the northern hemisphere and the skew is all wrong, even upside down the don't work, good work on the calculations, but id me more inclined to use 2 separate LNBs

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