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How do flatbed microwave ovens work?
This is what I think of as a magnetron, as used in conventional microwave ovens with a turntable:
http://www.hokuto.co.jp/eng/products...dex_img_01.gif It's about the size of a fist. So how do they make them flat under the food cavity in flatbed ovens? Does the magnetron sit under there and is redesigned to be flat? Or is there some kind of fancy rotating waveguide, and the magnetron sits at the side as before? -- Kakistocracy - Government by the least qualified or most unprincipled citizens. http://www.thefreedictionary.com/kakistocracy |
How do flatbed microwave ovens work?
This is what I think of as a magnetron, as used in conventional microwave ovens with a turntable:
http://www.hokuto.co.jp/eng/products...dex_img_01.gif It's about the size of a fist. So how do they make them flat under the food cavity in flatbed ovens? Does the magnetron sit under there and is redesigned to be flat? Or is there some kind of fancy rotating waveguide, and the magnetron sits at the side as before? Basically the later I should think. The one I had in the 1980s had a large aperture covered with mica on the roof of the cooking cavity. The Magnetron was at the side of the cavity with a brass wave guide leading up to the top. A squirrel-cage fan blows air up the wave guide and not only cools the Magnetron, but also rotates a paddle-wheel at the top, a rotating antenna, carrying multiple reflectors thar distribute the radiation throughout the cavity. I imagine modern bottom entry ones do a similar trick, but I have yet to work on one. -- Graham. %Profound_observation% |
How do flatbed microwave ovens work?
On Fri, 01 Jun 2018 16:21:19 +0100, Graham. wrote:
This is what I think of as a magnetron, as used in conventional microwave ovens with a turntable: http://www.hokuto.co.jp/eng/products...dex_img_01.gif It's about the size of a fist. So how do they make them flat under the food cavity in flatbed ovens? Does the magnetron sit under there and is redesigned to be flat? Or is there some kind of fancy rotating waveguide, and the magnetron sits at the side as before? Basically the later I should think. The one I had in the 1980s had a large aperture covered with mica on the roof of the cooking cavity. The Magnetron was at the side of the cavity with a brass wave guide leading up to the top. A squirrel-cage fan blows air up the wave guide and not only cools the Magnetron, but also rotates a paddle-wheel at the top, a rotating antenna, carrying multiple reflectors thar distribute the radiation throughout the cavity. I imagine modern bottom entry ones do a similar trick, but I have yet to work on one. I didn't realise they were available in 1980. So why aren't they all like that? Does it add a lot to the price? -- "Flashlights are tubular metal containers kept in a flight bag for the purpose of storing dead batteries." |
CAUTION!!! Birdbrain, the Abnormal Pathological Attention Whore, Strikes, AGAIN!
On Fri, 01 Jun 2018 15:23:45 +0100, Birdbrain Macaw (now "James Wilkinson"),
the pathological attention whore of all the uk ngs, blathered again: FLUSH the abnormal sociopathic attention whore's latest idiotic attention-baiting bull**** unread again -- Tony944 addressing Birdbrain Macaw: "I seen and heard many people but you are on top of list being first class ass hole jerk. ...You fit under unconditional Idiot and should be put in mental institution. MID: -- Pelican to Birdbrain Macaw: "Ok. I'm persuaded . You are an idiot." MID: -- DerbyDad03 addressing Birdbrain Macaw (now "James Wilkinson" LOL): "Frigging Idiot. Get the hell out of my thread." MID: -- Kerr Mudd-John about Birdbrain Macaw (now "James Wilkinson" LOL): "It's like arguing with a demented frog." MID: -- Mr Pounder Esquire about Birdbrain Macaw (now "James Wilkinson" LOL): "the **** poor delivery boy with no hot running water, 11 cats and several parrots living in his hovel." MID: -- Rob Morley about Birdbrain: "He's a perennial idiot" MID: 20170519215057.56a1f1d4@Mars -- JoeyDee to Birdbrain "I apologize for thinking you were a jerk. You're just someone with an IQ lower than your age, and I accept that as a reason for your comments." MID: l-september.org -- Sam Plusnet about Birdbrain (now "James Wilkinson Sword" LOL): "He's just desperate to be noticed. Any attention will do, no matter how negative it may be." MID: -- asking Birdbrain: "What, were you dropped on your head as a child?" MID: -- Christie addressing endlessly driveling Birdbrain Macaw (now "James Wilkinson" LOL): "What are you resurrecting that old post of mine for? It's from last month some time. You're like a dog who's just dug up an old bone they hid in the garden until they were ready to have another go at it." MID: -- Mr Pounder's fitting description of Birdbrain Macaw: "You are a well known fool, a tosser, a pillock, a stupid unemployable sponging failure who will always live alone and will die alone. You will not be missed." MID: -- Richard to pathetic ****** Hucker: "You haven't bred? Only useful thing you've done in your pathetic existence." MID: -- about Birdbrain (now "James Wilkinson" LOL): ""not the sharpest knife in the drawer"'s parents sure made a serious mistake having him born alive -- A total waste of oxygen, food, space, and bandwidth." MID: -- Mr Pounder exposing sociopathic Birdbrain: "You will always be a lonely sociopath living in a ******** with no hot running water with loads of stinking cats and a few parrots." MID: -- francis about Birdbrain (now "James Wilkinson" LOL): "He seems to have a reputation as someone of limited intelligence" MID: -- Peter Moylan about Birdbrain (now "James Wilkinson" LOL): "If people like JWS didn't exist, we would have to find some other way to explain the concept of "invincible ignorance"." MID: |
Troll-feeding Senile Idiot Alert!
On Fri, 01 Jun 2018 16:21:19 +0100, Graham., yet another braindead,
troll-feeding senile idiot, blathered: Basically the later I should think. Basically you ARE a senile troll-feeding moron! |
How do flatbed microwave ovens work?
On Fri, 01 Jun 2018 16:21:19 +0100, Graham. wrote:
This is what I think of as a magnetron, as used in conventional microwave ovens with a turntable: http://www.hokuto.co.jp/eng/products...dex_img_01.gif It's about the size of a fist. So how do they make them flat under the food cavity in flatbed ovens? Does the magnetron sit under there and is redesigned to be flat? Or is there some kind of fancy rotating waveguide, and the magnetron sits at the side as before? Basically the later I should think. The one I had in the 1980s had a large aperture covered with mica on the roof of the cooking cavity. The Magnetron was at the side of the cavity with a brass wave guide leading up to the top. A squirrel-cage fan blows air up the wave guide and not only cools the Magnetron, but also rotates a paddle-wheel at the top, a rotating antenna, carrying multiple reflectors thar distribute the radiation throughout the cavity. I imagine modern bottom entry ones do a similar trick, but I have yet to work on one. I didn't realise they were available in 1980. So why aren't they all like that? Does it add a lot to the price? The one we had is in the last illustration on this page https://www.photomemorabilia.co.uk/P...iterature.html I've still got the 170 page hard-back cookery book. -- Graham. %Profound_observation% |
How do flatbed microwave ovens work?
On Fri, 01 Jun 2018 18:13:54 +0100, Graham. wrote:
On Fri, 01 Jun 2018 16:21:19 +0100, Graham. wrote: This is what I think of as a magnetron, as used in conventional microwave ovens with a turntable: http://www.hokuto.co.jp/eng/products...dex_img_01.gif It's about the size of a fist. So how do they make them flat under the food cavity in flatbed ovens? Does the magnetron sit under there and is redesigned to be flat? Or is there some kind of fancy rotating waveguide, and the magnetron sits at the side as before? Basically the later I should think. The one I had in the 1980s had a large aperture covered with mica on the roof of the cooking cavity. The Magnetron was at the side of the cavity with a brass wave guide leading up to the top. A squirrel-cage fan blows air up the wave guide and not only cools the Magnetron, but also rotates a paddle-wheel at the top, a rotating antenna, carrying multiple reflectors thar distribute the radiation throughout the cavity. I imagine modern bottom entry ones do a similar trick, but I have yet to work on one. I didn't realise they were available in 1980. So why aren't they all like that? Does it add a lot to the price? The one we had is in the last illustration on this page https://www.photomemorabilia.co.uk/P...iterature.html I've still got the 170 page hard-back cookery book. Bloody hell, those look like very well made and very expensive(?) products. -- A guy bought his wife a beautiful diamond ring for Christmas. A friend of his said, "I thought she wanted one of those sporty 4-Wheel drive vehicles." "She did," he replied. "But where in the hell was I gonna find a fake Jeep?" |
How do flatbed microwave ovens work?
On 01/06/2018 18:13, Graham. wrote:
On Fri, 01 Jun 2018 16:21:19 +0100, Graham. wrote: This is what I think of as a magnetron, as used in conventional microwave ovens with a turntable: http://www.hokuto.co.jp/eng/products...dex_img_01.gif It's about the size of a fist. So how do they make them flat under the food cavity in flatbed ovens? Does the magnetron sit under there and is redesigned to be flat? Or is there some kind of fancy rotating waveguide, and the magnetron sits at the side as before? Basically the later I should think. The one I had in the 1980s had a large aperture covered with mica on the roof of the cooking cavity. The Magnetron was at the side of the cavity with a brass wave guide leading up to the top. A squirrel-cage fan blows air up the wave guide and not only cools the Magnetron, but also rotates a paddle-wheel at the top, a rotating antenna, carrying multiple reflectors thar distribute the radiation throughout the cavity. I imagine modern bottom entry ones do a similar trick, but I have yet to work on one. I didn't realise they were available in 1980. So why aren't they all like that? Does it add a lot to the price? The one we had is in the last illustration on this page https://www.photomemorabilia.co.uk/P...iterature.html I've still got the 170 page hard-back cookery book. That looks quite a sophisticated one for the early 80s. We bought one around 1981 and it had just a simple turn and 'run back' timer. It did last about 17 years, with only a couple of O rings in the turn table drive. We only disposed of it as it started to look tatty. We've had several since, none have lasted so well. -- Suspect someone is claiming a benefit under false pretences? Incapacity Benefit or Personal Independence Payment when they don't need it? They are depriving those in real need! https://www.gov.uk/report-benefit-fraud |
Troll-feeding Senile IDIOT Alert!
On Fri, 01 Jun 2018 18:13:54 +0100, Graham., yet another braindead,
troll-feeding senile idiot, blathered: The one we had is in the last illustration on this page You've been had by the dumbest troll these groups have ever seen, you brain dead idiot! |
How do flatbed microwave ovens work?
On Fri, 01 Jun 2018 19:06:45 +0100, Brian Reay wrote:
On 01/06/2018 18:13, Graham. wrote: On Fri, 01 Jun 2018 16:21:19 +0100, Graham. wrote: This is what I think of as a magnetron, as used in conventional microwave ovens with a turntable: http://www.hokuto.co.jp/eng/products...dex_img_01.gif It's about the size of a fist. So how do they make them flat under the food cavity in flatbed ovens? Does the magnetron sit under there and is redesigned to be flat? Or is there some kind of fancy rotating waveguide, and the magnetron sits at the side as before? Basically the later I should think. The one I had in the 1980s had a large aperture covered with mica on the roof of the cooking cavity. The Magnetron was at the side of the cavity with a brass wave guide leading up to the top. A squirrel-cage fan blows air up the wave guide and not only cools the Magnetron, but also rotates a paddle-wheel at the top, a rotating antenna, carrying multiple reflectors thar distribute the radiation throughout the cavity. I imagine modern bottom entry ones do a similar trick, but I have yet to work on one. I didn't realise they were available in 1980. So why aren't they all like that? Does it add a lot to the price? The one we had is in the last illustration on this page https://www.photomemorabilia.co.uk/P...iterature.html I've still got the 170 page hard-back cookery book. That looks quite a sophisticated one for the early 80s. We bought one around 1981 and it had just a simple turn and 'run back' timer. It did last about 17 years, with only a couple of O rings in the turn table drive. We only disposed of it as it started to look tatty. We've had several since, none have lasted so well. I once had a microwave that decided to run continuously for no reason, I think some water got through into the workings underneath. Maybe it was just the motor, but I couldn't be bothered as it was a cheap oven so I threw it out. I should have had a look inside. -- "Flashlights are tubular metal containers kept in a flight bag for the purpose of storing dead batteries." |
How do flatbed microwave ovens work?
"Brian Reay" wrote in message ... On 01/06/2018 18:13, Graham. wrote: On Fri, 01 Jun 2018 16:21:19 +0100, Graham. wrote: This is what I think of as a magnetron, as used in conventional microwave ovens with a turntable: http://www.hokuto.co.jp/eng/products...dex_img_01.gif It's about the size of a fist. So how do they make them flat under the food cavity in flatbed ovens? Does the magnetron sit under there and is redesigned to be flat? Or is there some kind of fancy rotating waveguide, and the magnetron sits at the side as before? Basically the later I should think. The one I had in the 1980s had a large aperture covered with mica on the roof of the cooking cavity. The Magnetron was at the side of the cavity with a brass wave guide leading up to the top. A squirrel-cage fan blows air up the wave guide and not only cools the Magnetron, but also rotates a paddle-wheel at the top, a rotating antenna, carrying multiple reflectors thar distribute the radiation throughout the cavity. I imagine modern bottom entry ones do a similar trick, but I have yet to work on one. I didn't realise they were available in 1980. So why aren't they all like that? Does it add a lot to the price? The one we had is in the last illustration on this page https://www.photomemorabilia.co.uk/P...iterature.html I've still got the 170 page hard-back cookery book. That looks quite a sophisticated one for the early 80s. We bought one around 1981 and it had just a simple turn and 'run back' timer. It did last about 17 years, with only a couple of O rings in the turn table drive. We only disposed of it as it started to look tatty. I'm still using the Sharp I bought in 73 almost every day. It does have a proper electronic control and display. Never had to do a thing to it. Corse now it will curl up and die and it will be your fault. We've had several since, none have lasted so well. |
How do flatbed microwave ovens work?
On Sat, 02 Jun 2018 02:08:15 +0100, Rod Speed wrote:
"Brian Reay" wrote in message ... On 01/06/2018 18:13, Graham. wrote: On Fri, 01 Jun 2018 16:21:19 +0100, Graham. wrote: This is what I think of as a magnetron, as used in conventional microwave ovens with a turntable: http://www.hokuto.co.jp/eng/products...dex_img_01.gif It's about the size of a fist. So how do they make them flat under the food cavity in flatbed ovens? Does the magnetron sit under there and is redesigned to be flat? Or is there some kind of fancy rotating waveguide, and the magnetron sits at the side as before? Basically the later I should think. The one I had in the 1980s had a large aperture covered with mica on the roof of the cooking cavity. The Magnetron was at the side of the cavity with a brass wave guide leading up to the top. A squirrel-cage fan blows air up the wave guide and not only cools the Magnetron, but also rotates a paddle-wheel at the top, a rotating antenna, carrying multiple reflectors thar distribute the radiation throughout the cavity. I imagine modern bottom entry ones do a similar trick, but I have yet to work on one. I didn't realise they were available in 1980. So why aren't they all like that? Does it add a lot to the price? The one we had is in the last illustration on this page https://www.photomemorabilia.co.uk/P...iterature.html I've still got the 170 page hard-back cookery book. That looks quite a sophisticated one for the early 80s. We bought one around 1981 and it had just a simple turn and 'run back' timer. It did last about 17 years, with only a couple of O rings in the turn table drive. We only disposed of it as it started to look tatty. I'm still using the Sharp I bought in 73 almost every day. It does have a proper electronic control and display. Never had to do a thing to it. Corse now it will curl up and die and it will be your fault. Whatever happened to Sharp, they still seem to be in business, but I haven't seen anything made by them for a decade or two. -- Mr Churchill is reputed to have once said "It will be long, it will be hard, and there'll be no withdrawal" |
How do flatbed microwave ovens work?
"Jimmy Wilkinson Knife" wrote in message ... On Sat, 02 Jun 2018 02:08:15 +0100, Rod Speed wrote: "Brian Reay" wrote in message ... On 01/06/2018 18:13, Graham. wrote: On Fri, 01 Jun 2018 16:21:19 +0100, Graham. wrote: This is what I think of as a magnetron, as used in conventional microwave ovens with a turntable: http://www.hokuto.co.jp/eng/products...dex_img_01.gif It's about the size of a fist. So how do they make them flat under the food cavity in flatbed ovens? Does the magnetron sit under there and is redesigned to be flat? Or is there some kind of fancy rotating waveguide, and the magnetron sits at the side as before? Basically the later I should think. The one I had in the 1980s had a large aperture covered with mica on the roof of the cooking cavity. The Magnetron was at the side of the cavity with a brass wave guide leading up to the top. A squirrel-cage fan blows air up the wave guide and not only cools the Magnetron, but also rotates a paddle-wheel at the top, a rotating antenna, carrying multiple reflectors thar distribute the radiation throughout the cavity. I imagine modern bottom entry ones do a similar trick, but I have yet to work on one. I didn't realise they were available in 1980. So why aren't they all like that? Does it add a lot to the price? The one we had is in the last illustration on this page https://www.photomemorabilia.co.uk/P...iterature.html I've still got the 170 page hard-back cookery book. That looks quite a sophisticated one for the early 80s. We bought one around 1981 and it had just a simple turn and 'run back' timer. It did last about 17 years, with only a couple of O rings in the turn table drive. We only disposed of it as it started to look tatty. I'm still using the Sharp I bought in 73 almost every day. It does have a proper electronic control and display. Never had to do a thing to it. Corse now it will curl up and die and it will be your fault. Whatever happened to Sharp, Nothing special here. they still seem to be in business, Yep. but I haven't seen anything made by them for a decade or two. They arent as cheap as the worst crap but still buyable here. https://www.sharp.net.au/ |
How do flatbed microwave ovens work?
On Sat, 02 Jun 2018 12:01:14 +0100, Rod Speed wrote:
"Jimmy Wilkinson Knife" wrote in message ... On Sat, 02 Jun 2018 02:08:15 +0100, Rod Speed wrote: "Brian Reay" wrote in message ... On 01/06/2018 18:13, Graham. wrote: On Fri, 01 Jun 2018 16:21:19 +0100, Graham. wrote: This is what I think of as a magnetron, as used in conventional microwave ovens with a turntable: http://www.hokuto.co.jp/eng/products...dex_img_01.gif It's about the size of a fist. So how do they make them flat under the food cavity in flatbed ovens? Does the magnetron sit under there and is redesigned to be flat? Or is there some kind of fancy rotating waveguide, and the magnetron sits at the side as before? Basically the later I should think. The one I had in the 1980s had a large aperture covered with mica on the roof of the cooking cavity. The Magnetron was at the side of the cavity with a brass wave guide leading up to the top. A squirrel-cage fan blows air up the wave guide and not only cools the Magnetron, but also rotates a paddle-wheel at the top, a rotating antenna, carrying multiple reflectors thar distribute the radiation throughout the cavity. I imagine modern bottom entry ones do a similar trick, but I have yet to work on one. I didn't realise they were available in 1980. So why aren't they all like that? Does it add a lot to the price? The one we had is in the last illustration on this page https://www.photomemorabilia.co.uk/P...iterature.html I've still got the 170 page hard-back cookery book. That looks quite a sophisticated one for the early 80s. We bought one around 1981 and it had just a simple turn and 'run back' timer. It did last about 17 years, with only a couple of O rings in the turn table drive. We only disposed of it as it started to look tatty. I'm still using the Sharp I bought in 73 almost every day. It does have a proper electronic control and display. Never had to do a thing to it. Corse now it will curl up and die and it will be your fault. Whatever happened to Sharp, Nothing special here. they still seem to be in business, Yep. but I haven't seen anything made by them for a decade or two. They arent as cheap as the worst crap but still buyable here. https://www.sharp.net.au/ Maybe here too, but I just haven't seen anyone with a Sharp device for 20 years. They used to be everywhere. AFAIK they were always midrange. Not overpriced like Sony, but decent. Something like LG. Just checked a retailer he https://www.currys.co.uk/gbuk/househ...-criteria.html 5 Sharp microwaves on offer, but 40 Russell Hobbs, 29 Bosch, 24 Swan, 15 Samsung, 25 Hotpoint. So not the most popular by far. -- Intercourse prevents divorce. |
Troll-feeding Senile Ozzie Alert!
On Sat, 2 Jun 2018 21:01:14 +1000, cantankerous geezer Rot Speed blabbered,
again: Nothing special here. NEITHER of you two idiotic trolls is! BG -- Sqwertz to Rot Speed: "This is just a hunch, but I'm betting you're kinda an argumentative asshole. MID: |
How do flatbed microwave ovens work?
"Jimmy Wilkinson Knife" wrote in message ... On Sat, 02 Jun 2018 12:01:14 +0100, Rod Speed wrote: "Jimmy Wilkinson Knife" wrote in message ... On Sat, 02 Jun 2018 02:08:15 +0100, Rod Speed wrote: "Brian Reay" wrote in message ... On 01/06/2018 18:13, Graham. wrote: On Fri, 01 Jun 2018 16:21:19 +0100, Graham. wrote: This is what I think of as a magnetron, as used in conventional microwave ovens with a turntable: http://www.hokuto.co.jp/eng/products...dex_img_01.gif It's about the size of a fist. So how do they make them flat under the food cavity in flatbed ovens? Does the magnetron sit under there and is redesigned to be flat? Or is there some kind of fancy rotating waveguide, and the magnetron sits at the side as before? Basically the later I should think. The one I had in the 1980s had a large aperture covered with mica on the roof of the cooking cavity. The Magnetron was at the side of the cavity with a brass wave guide leading up to the top. A squirrel-cage fan blows air up the wave guide and not only cools the Magnetron, but also rotates a paddle-wheel at the top, a rotating antenna, carrying multiple reflectors thar distribute the radiation throughout the cavity. I imagine modern bottom entry ones do a similar trick, but I have yet to work on one. I didn't realise they were available in 1980. So why aren't they all like that? Does it add a lot to the price? The one we had is in the last illustration on this page https://www.photomemorabilia.co.uk/P...iterature.html I've still got the 170 page hard-back cookery book. That looks quite a sophisticated one for the early 80s. We bought one around 1981 and it had just a simple turn and 'run back' timer. It did last about 17 years, with only a couple of O rings in the turn table drive. We only disposed of it as it started to look tatty. I'm still using the Sharp I bought in 73 almost every day. It does have a proper electronic control and display. Never had to do a thing to it. Corse now it will curl up and die and it will be your fault. Whatever happened to Sharp, Nothing special here. they still seem to be in business, Yep. but I haven't seen anything made by them for a decade or two. They arent as cheap as the worst crap but still buyable here. https://www.sharp.net.au/ Maybe here too, but I just haven't seen anyone with a Sharp device for 20 years. They used to be everywhere. AFAIK they were always midrange. Not overpriced like Sony, but decent. Something like LG. Just checked a retailer he https://www.currys.co.uk/gbuk/househ...-criteria.html 5 Sharp microwaves on offer, but 40 Russell Hobbs, 29 Bosch, 24 Swan, 15 Samsung, 25 Hotpoint. So not the most popular by far. There's heaps here https://www.sharp.net.au/home-products/microwaves |
Troll-feeding Senile Ozzie Alert!
On Sun, 3 Jun 2018 09:45:07 +1000, cantankerous geezer Rot Speed produced
yet more rot: There's heaps here https://www.sharp.net.au/home-products/microwaves Senile idiot and infantile idiot -after a long period of estrangement and sulking at each other- found each other again! Bruahahahahahahahahahaaa!!! |
How do flatbed microwave ovens work?
"Rod Speed" wrote in
: "Jimmy Wilkinson Knife" wrote in message ... On Sat, 02 Jun 2018 12:01:14 +0100, Rod Speed wrote: "Jimmy Wilkinson Knife" wrote in message ... On Sat, 02 Jun 2018 02:08:15 +0100, Rod Speed wrote: "Brian Reay" wrote in message ... On 01/06/2018 18:13, Graham. wrote: On Fri, 01 Jun 2018 16:21:19 +0100, Graham. wrote: This is what I think of as a magnetron, as used in conventional microwave ovens with a turntable: http://www.hokuto.co.jp/eng/products...img/index_img_ 0 1.gif It's about the size of a fist. So how do they make them flat under the food cavity in flatbed ovens? Does the magnetron sit under there and is redesigned to be flat? Or is there some kind of fancy rotating waveguide, and the magnetron sits at the side as before? Basically the later I should think. The one I had in the 1980s had a large aperture covered with mica on the roof of the cooking cavity. The Magnetron was at the side of the cavity with a brass wave guide leading up to the top. A squirrel-cage fan blows air up the wave guide and not only cools the Magnetron, but also rotates a paddle-wheel at the top, a rotating antenna, carrying multiple reflectors thar distribute the radiation throughout I recall a Phillips one in the 70's which had the controls and presumably the magnetron above the cavity. I don't think it had a turntable. One would suit me now as it woual be narrower. |
How do flatbed microwave ovens work?
I recall a Phillips one in the 70's which had the controls and presumably the magnetron above the cavity. I don't think it had a turntable. One would suit me now as it woual be narrower. |
How do flatbed microwave ovens work?
On Sun, 03 Jun 2018 00:45:07 +0100, Rod Speed wrote:
"Jimmy Wilkinson Knife" wrote in message ... On Sat, 02 Jun 2018 12:01:14 +0100, Rod Speed wrote: "Jimmy Wilkinson Knife" wrote in message ... On Sat, 02 Jun 2018 02:08:15 +0100, Rod Speed wrote: "Brian Reay" wrote in message ... On 01/06/2018 18:13, Graham. wrote: On Fri, 01 Jun 2018 16:21:19 +0100, Graham. wrote: This is what I think of as a magnetron, as used in conventional microwave ovens with a turntable: http://www.hokuto.co.jp/eng/products...dex_img_01.gif It's about the size of a fist. So how do they make them flat under the food cavity in flatbed ovens? Does the magnetron sit under there and is redesigned to be flat? Or is there some kind of fancy rotating waveguide, and the magnetron sits at the side as before? Basically the later I should think. The one I had in the 1980s had a large aperture covered with mica on the roof of the cooking cavity. The Magnetron was at the side of the cavity with a brass wave guide leading up to the top. A squirrel-cage fan blows air up the wave guide and not only cools the Magnetron, but also rotates a paddle-wheel at the top, a rotating antenna, carrying multiple reflectors thar distribute the radiation throughout the cavity. I imagine modern bottom entry ones do a similar trick, but I have yet to work on one. I didn't realise they were available in 1980. So why aren't they all like that? Does it add a lot to the price? The one we had is in the last illustration on this page https://www.photomemorabilia.co.uk/P...iterature.html I've still got the 170 page hard-back cookery book. That looks quite a sophisticated one for the early 80s. We bought one around 1981 and it had just a simple turn and 'run back' timer. It did last about 17 years, with only a couple of O rings in the turn table drive. We only disposed of it as it started to look tatty. I'm still using the Sharp I bought in 73 almost every day. It does have a proper electronic control and display. Never had to do a thing to it. Corse now it will curl up and die and it will be your fault. Whatever happened to Sharp, Nothing special here. they still seem to be in business, Yep. but I haven't seen anything made by them for a decade or two. They arent as cheap as the worst crap but still buyable here. https://www.sharp.net.au/ Maybe here too, but I just haven't seen anyone with a Sharp device for 20 years. They used to be everywhere. AFAIK they were always midrange. Not overpriced like Sony, but decent. Something like LG. Just checked a retailer he https://www.currys.co.uk/gbuk/househ...-criteria.html 5 Sharp microwaves on offer, but 40 Russell Hobbs, 29 Bosch, 24 Swan, 15 Samsung, 25 Hotpoint. So not the most popular by far. There's heaps here https://www.sharp.net.au/home-products/microwaves Yes, but how common are they compared to other makes? -- If you can't beat your computer at chess, try kick boxing. |
How do flatbed microwave ovens work?
On Sun, 03 Jun 2018 11:29:55 +0100, DerbyBorn wrote:
"Rod Speed" wrote in : "Jimmy Wilkinson Knife" wrote in message ... On Sat, 02 Jun 2018 12:01:14 +0100, Rod Speed wrote: "Jimmy Wilkinson Knife" wrote in message ... On Sat, 02 Jun 2018 02:08:15 +0100, Rod Speed wrote: "Brian Reay" wrote in message ... On 01/06/2018 18:13, Graham. wrote: On Fri, 01 Jun 2018 16:21:19 +0100, Graham. wrote: This is what I think of as a magnetron, as used in conventional microwave ovens with a turntable: http://www.hokuto.co.jp/eng/products...img/index_img_ 0 1.gif It's about the size of a fist. So how do they make them flat under the food cavity in flatbed ovens? Does the magnetron sit under there and is redesigned to be flat? Or is there some kind of fancy rotating waveguide, and the magnetron sits at the side as before? Basically the later I should think. The one I had in the 1980s had a large aperture covered with mica on the roof of the cooking cavity. The Magnetron was at the side of the cavity with a brass wave guide leading up to the top. A squirrel-cage fan blows air up the wave guide and not only cools the Magnetron, but also rotates a paddle-wheel at the top, a rotating antenna, carrying multiple reflectors thar distribute the radiation throughout I recall a Phillips one in the 70's which had the controls and presumably the magnetron above the cavity. I don't think it had a turntable. One would suit me now as it woual be narrower. I wonder if it rotated? How unevenly cooked would something be without rotation? Would conduction of heat make up for it? I guess somebody could try it by removing the turntable from a conventional microwave. -- Two men were talking. "My son asked me what I did during the Sexual Revolution," said one. "I told him I was captured early and spent the duration doing the dishes. |
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