开云体育

Michigan Mighty Mite

Brian N4TRB All Messages By This Member #8066 I've accepted the challenge.? Here's my contribution to the MMM Revival. I'm not sure if this falls into the cute or the ugly category & glad it doesn't matter.? But that heat sink is definitely cute.? And the WW2 vintage FT-243 crystal is likely unique.? With 12 volts it's giving 0.4 watts.? I am very curious as to how that will compare with the dozens, maybe hundreds, of MMM rigs that show up at FDIM for the revival.? I'll bring a few QSL cards in the hope of making some MMM to MMM?contacts.?? This was fun. 73, Brian -- Brian R. Page, N4TRB Threads:? +1.678.427.1719
Brian KB9BVN All Messages By This Member #8067 开云体育 WoW!? That's a great looking MMM!? Nice job.? Is 400mw typical?? I think my last one was maybe 320mw on 40m. de KB9BVN Brian On 2/16/2025 4:17 PM, Brian N4TRB via groups.io wrote: toggle quoted message Show quoted text I've accepted the challenge.? Here's my contribution to the MMM Revival. I'm not sure if this falls into the cute or the ugly category & glad it doesn't matter.? But that heat sink is definitely cute.? And the WW2 vintage FT-243 crystal is likely unique.? With 12 volts it's giving 0.4 watts.? I am very curious as to how that will compare with the dozens, maybe hundreds, of MMM rigs that show up at FDIM for the revival.? I'll bring a few QSL cards in the hope of making some MMM to MMM?contacts.?? This was fun. 73, Brian -- Brian R. Page, N4TRB Threads:? +1.678.427.1719 -- 72 de KB9BVN
Brian N4TRB All Messages By This Member #8068 Hi Brian, I don't know what's typical.? I'm using a 2N2222A FWIW.? I thought about putting in a transistor socket and trying every NPN transistor in my junk box.? Unfortunately, I'm lazy... bp toggle quoted message Show quoted text On Sun, Feb 16, 2025 at 4:25?PM Brian KB9BVN via <kb9bvn=[email protected]> wrote: WoW!? That's a great looking MMM!? Nice job.? Is 400mw typical?? I think my last one was maybe 320mw on 40m. de KB9BVN Brian On 2/16/2025 4:17 PM, Brian N4TRB via wrote: I've accepted the challenge.? Here's my contribution to the MMM Revival. I'm not sure if this falls into the cute or the ugly category & glad it doesn't matter.? But that heat sink is definitely cute.? And the WW2 vintage FT-243 crystal is likely unique.? With 12 volts it's giving 0.4 watts.? I am very curious as to how that will compare with the dozens, maybe hundreds, of MMM rigs that show up at FDIM for the revival.? I'll bring a few QSL cards in the hope of making some MMM to MMM?contacts.?? This was fun. 73, Brian -- Brian R. Page, N4TRB Threads:? +1.678.427.1719 -- 72 de KB9BVN
Shirley Dulcey KE1L All Messages By This Member #8071 A terminal strip - very old school. Using an analog meter to test it is karmically correct. Very nice build, not ugly at all. toggle quoted message Show quoted text On Sun, Feb 16, 2025 at 4:31?PM Brian N4TRB via <brpjournalist=[email protected]> wrote: Hi Brian, I don't know what's typical.? I'm using a 2N2222A FWIW.? I thought about putting in a transistor socket and trying every NPN transistor in my junk box.? Unfortunately, I'm lazy... bp On Sun, Feb 16, 2025 at 4:25?PM Brian KB9BVN via <kb9bvn=[email protected]> wrote: WoW!? That's a great looking MMM!? Nice job.? Is 400mw typical?? I think my last one was maybe 320mw on 40m. de KB9BVN Brian On 2/16/2025 4:17 PM, Brian N4TRB via wrote: I've accepted the challenge.? Here's my contribution to the MMM Revival. I'm not sure if this falls into the cute or the ugly category & glad it doesn't matter.? But that heat sink is definitely cute.? And the WW2 vintage FT-243 crystal is likely unique.? With 12 volts it's giving 0.4 watts.? I am very curious as to how that will compare with the dozens, maybe hundreds, of MMM rigs that show up at FDIM for the revival.? I'll bring a few QSL cards in the hope of making some MMM to MMM?contacts.?? This was fun. 73, Brian -- Brian R. Page, N4TRB Threads:? +1.678.427.1719 -- 72 de KB9BVN
Casey KC9IH All Messages By This Member #8082 My early Parts "inventory" was an occasional CK722, but typically 2N107's or 2N170's (and 1N34"s) (thanks to Allied Radio Mail Order). As I got older, my favorite Designs were all using 2N3053's. I don't think even I have any 2N2222"s here at all.? ? NOTE: For Decades I have wanted to try a 2N3055, in a TX, maybe on my next Build. It should be good for a few more mw output.? ? 73 de CaseyK kc9ih/wd9gka? Casey Nine International Harvester? I like Red Tractors?
Brian N4TRB All Messages By This Member #8083 Hi Casey, Coincidentally, I collect vintage transistors and have a couple of CK722s and lots of pinched tops from the 1950s.? As a child of the 1960s, I grew up in the discrete component transistor days and have never really gotten comfortable with integrated circuits.? Amongst the transistors in my collection are these 2N1143 transistors.? Two of these type were used in the beacon transmitter attached to the Echo 1 satellite from 1960.? I found the schematic of the beacon in an issue of 1961 RCA Review.? So one pile of parts on my workbench will be my attempt to recreate that beacon using two of my collection.?? 73, Brian toggle quoted message Show quoted text On Tue, Feb 18, 2025 at 3:51?PM Casey KC9IH via <kc9ih=[email protected]> wrote: My early Parts "inventory" was an occasional CK722, but typically 2N107's or 2N170's (and 1N34"s) (thanks to Allied Radio Mail Order). As I got older, my favorite Designs were all using 2N3053's. I don't think even I have any 2N2222"s here at all.? ? NOTE: For Decades I have wanted to try a 2N3055, in a TX, maybe on my next Build. It should be good for a few more mw output.? ? 73 de CaseyK kc9ih/wd9gka? Casey Nine International Harvester? I like Red Tractors?
Don N2VGU All Messages By This Member #8085 On Tue, Feb 18, 2025 at 03:51 PM, Casey KC9IH wrote: For Decades I have wanted to try a 2N3055, in a TX, maybe on my next Build. It should be good for a few more mw output.? fT of those devices is only 2.5-3MHz, I think the old RCA ones were lower.? I worked with guys who developed and characterized them at RCA, they had shoeboxes full of them. The transistor die had such coarse features that you could see the base and emitter with unaided eyes, it was about 5mm square.?? 73, Don N2VGU

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