Archive for June, 2011
So after getting the StarWars pinball machine the next one I kept a lookout for was a GoldenEye pinball machine, and wouldn’t you know it one appeared on Craig’s List. Called up the owner and he brought it over, said it belong to a friend of his that purchased it for his son and it never got played. And it looks it, except its got quite a layer of dust/suit(?) on it. So I am guessing it spent some time in a garage.
So pretty much everything works on it, a few bulbs out and the satellite motor is a dead short, but the magnets and everything else works. So ordered some spare parts and a LED kit to retrofit it.
Started breaking it down so I can clean the playfield and all the plastics/parts etc.
Here are the ramps removed, going to try and clean them up/polish and clear up the plastic using Novus.
Much work to do!
So I finally got around to working on the permanent 147.180Mhz repeater… originally the 147.345Mhz repeater this was supposed to be the permanent repeater, the current one was just temporary… so after 5 or so years in service I figure its about time the real one went up 🙂
so here is the basic layout of the repeater… from top to bottom
1) Audio Compressor – Will normalize (expand/compress) incoming audio before the repeater controller
2) Arcom RC-210 repeater controller – Not sure if this will be the final controller, thinking of getting an S-Com 7330 since I am not totally happy with the Arcom
3) Audio panel – this panel just has a speaker, volume control and selector switch that lets you listen to the audio coming out of each receiver
4) Receiver Voter – basically an audio comparator, as part of a voting system the voter is what decides which receiver is getting the “best” signal and “votes” it, aka passes the audio to the controller
5) Mastr III – this is the actual VHF 2M repeater…
6) Mastr III Receiver Shelf – this has 2x UHF receivers for the satellite receive site links
7) Mastr III Receiver Shelf – this has 1x UHF receiver for satellite receive site links
8 ) UHF Preamplifier/multi coupler – shares one UHF antenna to the 3x UHF receivers
9) Fuse Panel – distributes the high current 12V to all the low current 12V equipment
10) 12V high current power supply – powers everything in the shelf minus any power amplifiers
11) 26V high current power supply – powers the Mastr III VHF PA
12) VHF Mastr III PA – 10mW in 110W out – set to 15W out via software PA pot setting… will be driving a 250W TPL PA
so first thing I had to do was program the all the shelfs…
then tune the RX Synthesizer modules…
Red light indicates no lock. There is a tunable capacitor to tweak the VCO.
using an extender card you tweak the VCO until the red light turns off… then you have to tune the front end…
basically a 5 slug filter in front of the receiver to increase selectivity
tuning it requires the use of a signal generator… as you get closer to getting it properly tuned you keep turning down your signal until you get it to “ideal”… which ideally should be at -120dBm or better
next up is the transmitter
using the Mastr III DOS software and the PA PWR setting I tuned the Mastr III’s PA to 15W so it could drive a secondary PA, a 250W TPL
I did this for 2 reasons, 1 the Mastr III PA is a lot more difficult/expensive to repair/replace than the TPL, so the TPL will act as a “sacrificial lamb” if anything catastrophic happens to the repeater… 2 once the system gets its satellite receive sites its receive footprint is going to be pretty large, so we need to compensate with more transmit power
done for now… all thats left is to use the service monitor and a TIMS set to set all the audio levels
So I picked up a pinball machine this weekend… found it on Craigslist. Its a 1992 Star Wars Trilogy machine made by Data East… it is in decent shape. It needs some of the plastics replaced and the death star is also in need of repair/replacement. Ordered the replacement plastics I was able to find and also a kit to change all 157 light bulbs to LEDs!
Here it is in its new home
Invited some people over to break it in
Finally decided to do something with this domain.
Going to start logging some of my projects on here… more soon!