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Post by part15engineer on Oct 18, 2020 18:06:22 GMT
i recently sold my LPB TCU-30 which i probably shouldn't have done. now i'm on the hunt for another one.
Does anyone have a reasonably priced ($100 or less shipped) LPB carrier current coupler?
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Post by Boomer on Oct 19, 2020 12:14:48 GMT
I haven't seen much LPB gear on the used market places recently, maybe it's being used at churches? LPB equipment seems to have sold thousands of units, I wonder where they all went to?
Are you skilled with building equipment? I've been discussing couplers a lot with Tha Dood, coming to the conclusion that LPB is overbuilt for feeding large power systems in schools, but you don't really need that complexity for home use, and it can be done with 4-5 active components at home and customized for your situation. See Carrier Current Techniques by Ernie Wilson design examples.
Boomer
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Post by part15engineer on Oct 21, 2020 0:53:22 GMT
looks like i might be getting an older LPB T2C coupler for free but will need to locate an actual TCU-30 or T-4 Decade Box to match the T2C,
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Post by Boomer on Oct 21, 2020 2:02:42 GMT
ProI can see some stations wanting to have pro equipment, and those older LPB units should be just fine, not much that can go wrong with them, being passive devices. When you look at the LPB coupler schematics, it seems really complicated, but coupling a transmitter to an AC line to broadcast by carrier current isn't as hard as it looks, no harder to understand than tuning a P-15 transmitter with an antenna and loading coil. I have some PDFs from Ernie Wilson of Panaxis, and how he broke down the theory of coupling. Both are from 1979, and one is the section of the Carrier Current Techniques book, scanned by Tha Dood, and Ernie's AMA-5000 carrier current RF amp. The next to the last page of that shows a simple no-tune coupler circuit to get started. That type is very similar to what a wireless intercom would use. Ernie Wilson 1979 AM C-C Coupling.pdf (30.21 KB) Panaxis AMA 5000 Medium Wave Linear Amplifi....pdf (59.9 KB) Hope these help someone. Boomer
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