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Forum Index : Microcontroller and PC projects : 458MHz amplified splitter?
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| Boppa Guru  Joined: 08/11/2016 Location: AustraliaPosts: 814 |
There are LPF for fm radio broadcasts, amateur radios, most are home built simply because you really want it to apply to a particular set of frequencies...- what particular frequency are you looking at? plus if you are having harmonics issues with a tx unit, you want a LPF that has its cutout above your actual transmitting frequency (you really need the filter curve figures because you dont want the filter cutting off your tx power! usually you have your filter set halfway between your tx frequency and your first harmonic frequency thats detectable, but it doesnt have to be a particular exact frequency, they simply arent that sharp a cutout for most, and a few Mhz (or even a few 10's of mhz at uhf) |
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| Phil23 Guru Joined: 27/03/2016 Location: AustraliaPosts: 1667 |
My TV distribution was fine here, until a while ago; 7 outlets to 5 TV's & 2 "Boxes"... Telstra's 850Meg then started swamping everything's receivers front end. Fixed that, filter between the antenna & dist amp. Easy peasey. Then Optus stands a 4G tower with 700Meg among others 180m down the road... This one gets in not thru the aerial, but via the old run of RG-59 from the lounge room to the bedroom, about 10-15m. Only bit that's left that's RG59 & not RG6, AND a real sh*t of a crawl under the house to replace. Cheers Phil. |
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| Phil23 Guru Joined: 27/03/2016 Location: AustraliaPosts: 1667 |
Lantastic ring any bells? Cut my teeth on the 2Mbps adaptors before stepping up to the 10Mbps big boys... Oh, and did play with the 115200kbps one that was software only & used RS-232 ports. Phil. |
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| Phil23 Guru Joined: 27/03/2016 Location: AustraliaPosts: 1667 |
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| Boppa Guru Joined: 08/11/2016 Location: AustraliaPosts: 814 |
Lantastic, god havent heard that in years.... And did a lot of the old serial port to serial port as well (using the db25's, hand soldered lol) For many years I had an old vt100 out on the back veranda, was left out there permanently- too heavy and too old to even bother stealing, just threw a garbag over it when not in use to keep the rain off, that was my outside net surfer right up until early/mid 2000's... It could only handle text of course but then it was the heyday of the big forums and they all displayed pretty much ok (sssf, techtalk, scribbly gum,JJJ, pol animal all over at the abc, bad astronomy, jref later on |
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| Boppa Guru Joined: 08/11/2016 Location: AustraliaPosts: 814 |
Is it `properly secured' or just hung over handy beams like I usually do on my own stuff??? if hanging loose, start at the point furthest away, tape old coax to new coax (even solder together if heavy pulling may be required then feed through till joint is under the house, the pull on it until at other end (a feeder at the non pulled end helps) nine times out of ten I can do it without even getting under the house (or in the roof) with a bit of back and forth jiggling at various bind spots It usually binds when re entering the hole, usually inches from the end, but do it that way, at least you dont have to crawl as far to unhook it as if you had done it the other direction I got really good at that over the years, I'd hate to think of the miles of coax and networking cables (and other cables) Ive run over my life- probably reach the moon and back lol |
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| Alastair Senior Member  Joined: 03/04/2017 Location: AustraliaPosts: 161 |
Lantastic - that brings back memories. I ran it in a commercial site in its very earlier days because the practice owners would not pay for "real" network h/w and s/w. It was buggy in the early phase but got sorted. Certainly a cheap option initially. I used it to access a database on a common system in a network of 6 pc's. My first problems were that it did not correctly support multi user access for a Dataflex resource. For about 2 years I had to use a pseudo lock on records by setting a field in a record I wanted to update. It still potentially had a race condition risk of coincident access. I got away with it long enough until the practice agreed to pay for a Netware server - therein lies another tale. Cheers, Alastair |
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Grogster Admin Group  Joined: 31/12/2012 Location: New ZealandPosts: 9610 |
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Azure Guru Joined: 09/11/2017 Location: AustraliaPosts: 446 |
I remember putting together Corvus OMNInet networks. Coax was still too expensive for small businesses. OMNInet was based on twisted pair, but lost out to Coax a few years later. In the mid 80's I ported Novell Netware to the NEC Computers at the time. So OMNInet was twisted pair. Company went Ch.11. Lost out to Coax for networking market. Coax went from thick to thin cabling. During this time token ring was a contendor. Years later market switches from Coax to twisted pair. What fun times we had. |
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bigmik Guru Joined: 20/06/2011 Location: AustraliaPosts: 2950 |
Phil, All, My first efforts with setting up a network was with LANTASTIC (Circa mid '80s) and 50ohm coax linking the PCs together.. I had forgotten that until you awakened my sleeping brain cells.. Then went to twisted pair 10MB and up to GB, I thought I knew all there was to know until work sent me on a CISCO course... Crikey talk about eye opener ... I have since forgotten more than I ever knew but at least I have the understanding of what `real' networks can do.. Kind Regards, Mick Mick's uMite Stuff can be found >>> HERE (Kindly hosted by Dontronics) <<< |
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| Phil23 Guru Joined: 27/03/2016 Location: AustraliaPosts: 1667 |
Ripped 70% of the flooring out of this house; big job even with the circular & chain saws.... Over he next 3 weeks while all the old stumps were being pulled & replaced with steel I spent a lot of time with saddles & staples tidying everything up. Of the 6 Coax feeds, 2 remained as RG59. At the time there was about a dozen CAT5 runs. That was before I somehow have managed to get rid of another 200m of Cat6 in the last few weeks.... Phil. |
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| Boppa Guru Joined: 08/11/2016 Location: AustraliaPosts: 814 |
ouch.... One trick I have used in the past for ultralow stumped houses where access isnt possible, is to basically run the coax in small conduit, then drill the hole slantwise at the feed point and just keep pushing it through the hole until it pops out from under the house, secure both ends up in the air so water cant get in and bingo, coax installed. I had to do this in a house where the tv outlet was basically as near as dead set in the center of the house and it was a flat roof ie no roof cavity. Short of deroofing half the house, I did my slanted hole trick in the corner of the lounge where the tv was and just fed it till it was available at the edge, then ran it along the edge to a downpipe and up conduit hidden by the downpipe. Much neater and several hours labour less than the comps quote, which would have had the coax running along the floor in 3 rooms.... tacky.... |
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| lizby Guru Joined: 17/05/2016 Location: United StatesPosts: 3378 |
Pardon my unfamiliarity with the term, but what is meant by "stumped house". PicoMite, Armmite F4, SensorKits, MMBasic Hardware, Games, etc. on fruitoftheshed |
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TassyJim Guru Joined: 07/08/2011 Location: AustraliaPosts: 6283 |
It's a house that is built on 'piles', or 'stumps' rather than on a slab directly on the ground.  A typical "Queenslander" (Named after the State they were popular in). The high set house with lots of room underneath was perfect for natural cooling in the hot Queensland summers. Most have had the underneath bricked up to create extra living space and the natural cooling has been replaced with air conditioning. High stumps weer easy to get under for rewiring etc but low 'stumps' give very little wriggle room, especially as your belly expands with age. Sharing a tight space with the snakes is not my idea of fun. Jim (ex Queenslander) VK7JH MMedit |
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| Boppa Guru Joined: 08/11/2016 Location: AustraliaPosts: 814 |
Tell me about it, I just did a mates place putting security cameras up, had about a 4ft high roof cavity, and I am neither as agile or as slim as I used to be 30 years ago.... took 2 days to wire up, and man, did I feel it afterwards..... (Now I know why the apprentices always got the s%@t jobs like that, because if I had had one, I wouldnt have been up in that roof lol) |
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| Grogster Admin Group Joined: 31/12/2012 Location: New ZealandPosts: 9610 |
"He's only the apprentice, and we're only having fun!" Smoke makes things work. When the smoke gets out, it stops! |
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| Phil23 Guru Joined: 27/03/2016 Location: AustraliaPosts: 1667 |
It was Winter, so did need to keep the fire going while tidying wires..  40 Hydraulic jacks from memory, to get things back on the level. Not quite how it's done on reality TV.  Edit:- Nice Bearer's & Joists they used 100 years back.... |
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| Grogster Admin Group Joined: 31/12/2012 Location: New ZealandPosts: 9610 |
Do you need council consent for all that? Over here, you practically have to have $1500 consent - assuming they even issue it - for just about everything other then cutting the grass. ....and I am sure they are trying to work out how they can the people to pay resource consent for that too..... But you most definitely have to have consent to replace the floor in a house. ....and you would NOT be allowed to just use multiple car-jacks to level the floor - that would HAVE to be done by a certified engineer, costing additional thousands... Smoke makes things work. When the smoke gets out, it stops! |
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| Phil23 Guru Joined: 27/03/2016 Location: AustraliaPosts: 1667 |
No, Approval not required here to change existing. They simply leveled it with the jacks (about 60), from the lowest point, Then removed & replaced the stumps a few at a time. (105 in total). Floor that went back in was 22mm yellow tongue. Floor only came out in the lower inaccessible areas at the rear, of the sloped block. Other common practice is to rip floors out & pour a slab inside the walls & under the bottom plates. Phil. |
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| Grogster Admin Group Joined: 31/12/2012 Location: New ZealandPosts: 9610 |
You Aussies are one-up on us then in that respect!  /RANT Costs about $500 just for them to come and LOOK at what you plan to do - without issuing any consent - and that is for "Alterations to existing structure". So, no, we can't touch ANYTHING, even on pre-existing stuff, without doing the expensive consent process. You need consent here to rip up and replace the floor, the floor joists or the piles. ....and the aforementioned certified engineers report of compliance($$$) blah, blah, blah. Generally speaking, they won't let you do work like that yourself unless you are already a certified builder, so you HAVE to pay a builder to do it for you - more $$$. Knocking out a non-structural wall or adding a door or window or something - you can get sign-off on that pretty easy, but anything structural has to be done by the trade. It's a wonder anything gets done at all with so many pedantic bureaucratic regulations in place in the building code. Hell, our own Government was forced to publicly admit that our building code is way to convoluted and needs to be revamped to make it less complicated to get consents for things - that is not a good sign, when the Government admits something like that..... /RANT OVER. Smoke makes things work. When the smoke gets out, it stops! |
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