This is out of a wireless (RF) remote for one of those power lift beds for seniors. Remote says "The Genius Ultramatic" on it, and is model #R2-T3 (03-680252-03), FCC ID: MG8-R2-T. Standard Motorola MC145026P encoder, which is functioning.
I'm told the unit doesn't work. I don't have the bed that goes with it, so maybe it's the remote that's the problem, and maybe it isn't . . .
Haven't actually found anything that's NOT working in it yet. Don't have a receiver, so can't verify that it's actually transmitting anything. However, when I hold the device near unshielded speakers, I hear buzzing in the speakers when I push buttons on the remote. So, presumed working.
Anyhow, not a complicated circuit, but I'm trying to identify this component, which I would *guess* was an RF NPN transistor in a TO-39 can, but the pinout seems to be wrong based on the circuit layout (unless I'm not understanding something correctly). Every TO-39 RF transistor I've ever seen has the Base as pin 2, and this one seems to have the base as pin 3. Near as I can tell (radio is one of my electronic weak points), pins 1 and 2 are connected across the antenna and have heavier traces, while pin 3 seems to be the base, and has a skinny signal-style trace.
Markings: a logo I don't recognize (a triangle with a concave curved lower side) and the markings "R 677 JM5".
I've scanned maybe a dozen lists of manufacturer logos, couldn't find anything that was a match. Looks vaguely familiar, but I just can't place it.
Searched for variations on the numbers, didn't find a match. There is such a thing as an NE677M04 and even a 2SK677, which are RF transistors, but only available in SOT packages. There's a BD677 Darlington, but not RF and not TO-39.
See pictures. Yellow lines just show connections on the far side of the board, for easier understanding. The unit circled in purple is the unit in question.
Another thing I find odd about this unit is that, although it's a radio transmitter, I don't see any RF oscillators of any sort. How does that work? Obviously the antenna will be tuned for a particular frequency, but what flavor of transmitter is this? Uses the "spray and pray" transmission method, apparently? Please enlighten me on the theory of what's going on in the radio section.
I'm told the unit doesn't work. I don't have the bed that goes with it, so maybe it's the remote that's the problem, and maybe it isn't . . .
Haven't actually found anything that's NOT working in it yet. Don't have a receiver, so can't verify that it's actually transmitting anything. However, when I hold the device near unshielded speakers, I hear buzzing in the speakers when I push buttons on the remote. So, presumed working.Anyhow, not a complicated circuit, but I'm trying to identify this component, which I would *guess* was an RF NPN transistor in a TO-39 can, but the pinout seems to be wrong based on the circuit layout (unless I'm not understanding something correctly). Every TO-39 RF transistor I've ever seen has the Base as pin 2, and this one seems to have the base as pin 3. Near as I can tell (radio is one of my electronic weak points), pins 1 and 2 are connected across the antenna and have heavier traces, while pin 3 seems to be the base, and has a skinny signal-style trace.
Markings: a logo I don't recognize (a triangle with a concave curved lower side) and the markings "R 677 JM5".
I've scanned maybe a dozen lists of manufacturer logos, couldn't find anything that was a match. Looks vaguely familiar, but I just can't place it.
Searched for variations on the numbers, didn't find a match. There is such a thing as an NE677M04 and even a 2SK677, which are RF transistors, but only available in SOT packages. There's a BD677 Darlington, but not RF and not TO-39.
See pictures. Yellow lines just show connections on the far side of the board, for easier understanding. The unit circled in purple is the unit in question.
Another thing I find odd about this unit is that, although it's a radio transmitter, I don't see any RF oscillators of any sort. How does that work? Obviously the antenna will be tuned for a particular frequency, but what flavor of transmitter is this? Uses the "spray and pray" transmission method, apparently? Please enlighten me on the theory of what's going on in the radio section.
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