My SAT-playground

RimaNTSS · Jul 3, 2015

Brought home 2 pipes today

:
- 740mm x 140mm and wall thickness 8mm
- 1950mm x 89mm and 4mm walls. Have cut this pipe into 2 pieces 500mm and 1450mm.
89mm that what I need to fix NSC 1,8m antenna's polar-mount

. And vertical pipe from Prodelin dish has about 100mm diameter

. So, I am going to make adapter from 100mm to 89mm by welding together (do not know yet how) 140mm pipe and 89mm pipe, like this

.
Not easy to explain, will better show some pictures when everything up and running.

RimaNTSS · Jul 4, 2015

Used 89mm x 1450mm pipe to install polar-mount. Tuning TBC (I mean To Be Continued) ;)

RimaNTSS · Jul 4, 2015

I have this heavy duty 36-incher for a very long time but it was never used as it was always too big. It is also little bit too big for current setup. Will probably need to make new metal bar, number "1" on the picture. I also attached 2 pieces of wood to the polar-mount, and they are not only to hold the beer. Can somebody guess why those wooden parts attached there?

skomedal · Jul 4, 2015

RimaNTSS said:
I have this heavy duty 36-incher for a very long time but it was never used as it was always too big.

Poor wife

RimaNTSS · Jul 6, 2015

There are some new feedarms, LNB supports and holders, just need to be cut into right pieces and welded in the proper way. Material.... you know :rolleyes:

RimaNTSS · Jul 16, 2015

Just removed polar-mounted NSC 1,8m. Was not really happy with it's performance. I have suspicion it was painted by previous owned using not correct paint. Another option- I spent too less time tuning it. Anyway, it will be parked for a while in the garage. Instead of it installed SMW-1400, only for a day or two. Will install on that pole some of 1,2m dishes (did not decide which one will go first).

archive10 · Jul 16, 2015

RimaNTSS said:
I also attached 2 pieces of wood to the polar-mount, and they are not only to hold the beer. Can somebody guess why those wooden parts attached there?

No, it seems not. What was the purpose? To hold the mount to the mast?

RimaNTSS · Jul 16, 2015

O, sorry, forgot about question I asked

That was actually mechanical stop for antenna; it is better that mount touches wood (green circles) than antenna hits bolts (red circles). If I had 89mm pipe some 10cm longer than antenna would probably missed bolts. So, this was quick solution. :rolleyes:

RimaNTSS · Jul 18, 2015

Was visiting my Father-in-law, he gave me 60mm pipe. It is very old, rusty and has some pieces of metal welded to it. So removed odd parts and old paint (dirty job) and already painted. Will install this pipe tomorrow in case I need to erect some antennas. :rolleyes:

RimaNTSS · Jul 19, 2015

Installed "new" pipe in ground stand. Bolts are little bit too short, therefore some pieces of plywood are added in front of each bolt. Maybe, someday I will get longer bolts.... not today.

RimaNTSS · Jul 25, 2015

I have one Polar-mount (actually more than one, but this maybe has some chance to be installed)

. It had problem with one of the fixing nuts, so I've welded new nut

. But real problem with this PM is fact that it has not adjustable declination! Some ideas how to fix this are more than welcome. But other-ways this PM is strong and could easily handle 1,2m antenna. I also could be adjusted to handle different antennas, something like universal one. Till I find a best way what to do and how to di I hang PM on the wall.

RimaNTSS · Jul 26, 2015

I adopted feedarm, SUB and feedhorn from Fibo 55 to 1,8m Prodelin. Could not get noticeable increase of performance, but had a great time tuning.

CROSSBONES · Jul 26, 2015

RimaNTSS said:
I adopted feedarm, SUB and feedhorn from Fibo 55 to 1,8m Prodelin. Could not get noticeable increase of performance, but had a great time tuning.

But it looks better!

samoloko · Jul 26, 2015

Rima
did you try with fibo 90 subreflector

RimaNTSS · Jul 26, 2015

CROSSBONES said:
But it looks better!

Yes, of course- BIG FIBO!

samoloko said:
did you try with fibo 90 subreflector

I've tried year ago, and got about 8% increase of performance.

RimaNTSS · Jul 27, 2015

Today I attached SUB from Fibo 120. Got some positive results but still need to work on it.

samoloko · Jul 27, 2015

try to get at least 10 % better
would you post a pic from back of dish to see how back support plate connect to feed support arm

RimaNTSS · Jul 27, 2015

Will make more picks tomorrow, too late now.
I think I stuck to one issue which can diminish any dish comparison efforts. Namely- signal level jumping all the times not only changes during the day but also within minutes! I have monitored 11919H frequency from 26*E (where all MBC channels are) and I see that signal level can change up to 3% in couple of minutes (maybe even more), it also changes on daily basys and, in addition weather can impact results as well. So, I do not know how to go forward.
Attached is measurements of that frequency fixed each minute during 5 hours.
Any thoughts about this issue?
Can not attach rar file, there is link

gibertini · Jul 27, 2015

i have to say that the workmanship/quality on your mods/workarounds are absolutely first class and you should be congratulated.. all credit to you

RimaNTSS · Jul 28, 2015

@samoloko I do not sure what exactly you wish to see. Are those pics give you enough info?

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