| Subject: Re: What has he got that I havenīt part two |
Author:
iain
|
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Date Posted: 06:21:24 11/14/03 Fri
In reply to:
iain
's message, "Re: What has he got that I havenīt part two" on 06:12:02 11/14/03 Fri
>>>>>>2)What Corrigap said - how do you know you are on
>>2D
>>>>>>and not 2A - I seem to have the right beam ( from
>>>>>>memory it is 0002 and 07d4 ? ).
>>>>>>
>>>>>
>>>>>No, what I said was;
>>>>>
>>>>>My next step would be to check the alignment of the
>>>>>dish very carefully. Being perfectly aligned on 2a
>>>and
>>>>>b does not necessarily guarantee perfect alignment
>>on
>>>>>2d. Sometimes, a movement of a couple of mm can
>make
>>>a
>>>>>big difference.
>>>>>
>>>>>meaning that maximizing the signal is a lot more
>>>>>difficult on 2d than it is on 2a/b. The
>>significantly
>>>>>lower power level (39 watts) from 2d makes exact
>>>>>alignment extremely critical. You will need an
>>>>>alignment that is absolutely spot-on for 2d.
>>>>>Adjustments for 2d should always be done using 2d
>>>>>(low-band)frequencies, whether you're using
>>>>>professional equipment or just the signal bars on
>>the
>>>>>digibox. I found on many occasions when aligning my
>>>>>dish that even just pressing lightly on the sides
>of
>>>>>the dish (to give a horizontal movement) was enough
>>>to
>>>>>affect the signal level noticeably, i.e. a movement
>>>of
>>>>>no more than a few mm could lose or get back the
>>>>>signal.
>>>>>
>>>>>If you are going to attempt to get a usable signal
>>>>>from 2d in these parts on a 1.5m dish, then every
>>>link
>>>>>in your signal chain has to be working at maximum
>>>>>efficiency. But even if you do succeed in getting
>>>24/7
>>>>>reception in clear weather, you won't have any real
>>>>>bad-weather margin to fall back on.
>>>>>
>>>>>BTW, I beg to differ with Rich about the Panny 30
>>>>>being the answer to your problems. It's a good box
>>>but
>>>>>it won't make a silk purse out of a sow's ear - if
>>>>>you'll pardon the expression. I don't think any
>>>>>digibox can cope with the deep trough that the 2d
>>>>>signal falls into twice a day in this part of the
>>>>>world (i.e. after 11.00 and again after 19.30)when
>>>>>connected to a 1.5m dish. I struggled bravely with
>>my
>>>>>Panny 30 on a 1.5m Gibertini with an MTI flanged
>LNB
>>>>>not a million miles away from you.
>>>>>
>>>>>I can't say, either, that I've ever noticed any
>>>>>difference from tweaking the skew on any of the
>>>>>dishes/LNBs that I've used.
>>>>>
>>>>>There's only one real fix for a weak signal - a
>>>bigger
>>>>>dish.
>>>>>
>>>>>Corrigap
>>>>
>>>>
>>>>It's not that simple. The system is only as good as
>>>>the weakest part. Some boxes are simply no good in
>>>>fringe areas even with a bigger dish (like you say
>>>>silk purse/sows ear).
>>>>It's because the tuners are not selective enough.
>The
>>>>tuner picks up the stronger 2a/b signals and sets
>the
>>>>gain according to those. A bigger dish may even make
>>>>it worse!
>>>>
>>>>So start with a panny 30 and work from there.
>>>>/iain
>>>
>>>If you read the thread properly, you'll see that my
>>>comments about 'silk purse and sow's ear' were made
>in
>>>the context of a 1.5m dish not being enough *together
>>>with a panny 30* in this part of the world (southern
>>>Sweden). It was/is my belief that if Brian upgraded
>to
>>>a Panny 30 with his 1.5m dish, he would have got the
>>>same disappointing results that I had with that
>>>particular combination. He and I only live a short
>>>distance from each other.
>>>
>>>I agree that some boxes are no good in fringe areas
>>>and that 'the system is only as good as its weakest
>>>part', which I more or less said in my post.
>>>
>>>I was trying to pass on my own experience of having a
>>>1.5m Gibertini and a panny 30, which was not a
>>>fully-working 2d system until I upgraded to a 1.8 m
>>>Channel Master. Now I have almost perfect reception
>>>24/7. So in this particular case, based on personal
>>>experience, I don't agree that a new box is the way
>to
>>>go initially; the safer bet as far as I'm concerned
>>>would be a bigger dish first and *then* a better
>>>digibox, if necessary.
>>>
>>>Corrigap
>>
>>Sorry don't agree. Maybe a 150 is not big enough with
>>a panny where you are. I haven't said otherwise. I'm
>>just saying that "without a panny" or some equivalent
>>box that works well in fringe areas it may not matter
>>how big the dish is. I agree the only way to get more
>>signal strength to the box is a bigger dish. But that
>>won't help if the box can't use it properly. So what I
>>mean is "you can't make a silk purse out of a sow's
>>ear of a box".
>>
>>Large dishes are expensive a 2nd hand panny costs
>>around Ģ150. So I would start with the panny and work
>>up with the dish if possible.
>>
>>If you read the thread properly you'll see the
>>original posting referred to a someone else in the
>>area with an almost identical system. The question was
>>"what's he got that I don't?". The answer is a
>>different box.
>>
>>I agree with you on the skew though. I've never found
>>that made a lot of difference unless it's way out.
>>
>>/Iain
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