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#1
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Steel no good for chassis? (Which metal is best for old regen designs?)
Hi all,
I recently became interested in trying to build a small two-tube regen type receiver for broadcast and/or shortwave reception. I designed a simple chassis based on some vintage articles on the subject. This is the classic 'metal box with attched front faceplate' design. I was going to use cold-rolled steel since we have this at work and spot weld the face to the main chassis, but then I got to thinking that perhaps the steel might interfere with the coils. I noticed also after this that every old article that I've come across usually suggested aluminum for the chassis. They don't make mention of the reasons for this, however. I was wondering if ease of machinability for the amatuer working with simple hand tools, and perhaps also weight savings, were main factors, or was it mainly for lack of magnetic interation with the coils? We also have sheets of aluminum, brass, and stainless that I can use but I'm not sure if they can be resistance welded, so I would have to bolt the face onto the main chassis box. Anyone have any further ideas or insights? thanks in advance, Dave |
#2
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David Forsyth wrote:
Hi all, I recently became interested in trying to build a small two-tube regen type receiver for broadcast and/or shortwave reception. I designed a simple chassis based on some vintage articles on the subject. This is the classic 'metal box with attched front faceplate' design. I was going to use cold-rolled steel since we have this at work and spot weld the face to the main chassis, but then I got to thinking that perhaps the steel might interfere with the coils. I noticed also after this that every old article that I've come across usually suggested aluminum for the chassis. They don't make mention of the reasons for this, however. I was wondering if ease of machinability for the amatuer working with simple hand tools, and perhaps also weight savings, were main factors, or was it mainly for lack of magnetic interation with the coils? We also have sheets of aluminum, brass, and stainless that I can use but I'm not sure if they can be resistance welded, so I would have to bolt the face onto the main chassis box. Anyone have any further ideas or insights? thanks in advance, Dave Steel will be fine. Your suspicions about workability are correct but there is also plating/painting to consider. -Bill |
#3
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David Forsyth wrote:
Hi all, I recently became interested in trying to build a small two-tube regen type receiver for broadcast and/or shortwave reception. I designed a simple chassis based on some vintage articles on the subject. This is the classic 'metal box with attched front faceplate' design. I was going to use cold-rolled steel since we have this at work and spot weld the face to the main chassis, but then I got to thinking that perhaps the steel might interfere with the coils. I noticed also after this that every old article that I've come across usually suggested aluminum for the chassis. They don't make mention of the reasons for this, however. I was wondering if ease of machinability for the amatuer working with simple hand tools, and perhaps also weight savings, were main factors, or was it mainly for lack of magnetic interation with the coils? We also have sheets of aluminum, brass, and stainless that I can use but I'm not sure if they can be resistance welded, so I would have to bolt the face onto the main chassis box. Anyone have any further ideas or insights? thanks in advance, Dave Steel will be fine. Your suspicions about workability are correct but there is also plating/painting to consider. -Bill |
#4
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I recently became interested in trying to build a small two-tube regen type receiver for broadcast and/or shortwave reception. I designed a simple chassis based on some vintage articles on the subject. This is the classic 'metal box with attched front faceplate' design. I was going to use cold-rolled steel since we have this at work and spot weld the face to the main chassis, but then I got to thinking that perhaps the steel might interfere with the coils. I noticed also after this that every old article that I've come across usually suggested aluminum for the chassis. They don't make mention of the reasons for this, however. I was wondering if ease of machinability for the amatuer working with simple hand tools, and Aluminum is usually easier for most to work with with simple hand tools. Steel is fine but it might rust and look bad after a while. Make the chassie out of whatever kind of metel that you think is the best for you to work with . Electrically there will be little if any differance. |
#5
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I recently became interested in trying to build a small two-tube regen type receiver for broadcast and/or shortwave reception. I designed a simple chassis based on some vintage articles on the subject. This is the classic 'metal box with attched front faceplate' design. I was going to use cold-rolled steel since we have this at work and spot weld the face to the main chassis, but then I got to thinking that perhaps the steel might interfere with the coils. I noticed also after this that every old article that I've come across usually suggested aluminum for the chassis. They don't make mention of the reasons for this, however. I was wondering if ease of machinability for the amatuer working with simple hand tools, and Aluminum is usually easier for most to work with with simple hand tools. Steel is fine but it might rust and look bad after a while. Make the chassie out of whatever kind of metel that you think is the best for you to work with . Electrically there will be little if any differance. |
#6
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Yes, I have found when building regenerative receivers wood is the best
chassi. However a metal front panel is a must. However I only use battery tubes with low voltage. Never more than 45 volts. But when building solid-state regeneratives. A good ground plane helps. Build it the dead bug way. |
#7
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Yes, I have found when building regenerative receivers wood is the best
chassi. However a metal front panel is a must. However I only use battery tubes with low voltage. Never more than 45 volts. But when building solid-state regeneratives. A good ground plane helps. Build it the dead bug way. |
#8
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The "dead bug" way? I'm not sure what this means - please forgive me I'm
new to this :-) Dave "Bill Hennessy" wrote in message . .. Yes, I have found when building regenerative receivers wood is the best chassi. However a metal front panel is a must. However I only use battery tubes with low voltage. Never more than 45 volts. But when building solid-state regeneratives. A good ground plane helps. Build it the dead bug way. |
#9
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The "dead bug" way? I'm not sure what this means - please forgive me I'm
new to this :-) Dave "Bill Hennessy" wrote in message . .. Yes, I have found when building regenerative receivers wood is the best chassi. However a metal front panel is a must. However I only use battery tubes with low voltage. Never more than 45 volts. But when building solid-state regeneratives. A good ground plane helps. Build it the dead bug way. |
#10
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David Forsyth wrote: Hi all, I recently became interested in trying to build a small two-tube regen type receiver for broadcast and/or shortwave reception. I designed a simple chassis based on some vintage articles on the subject. This is the classic 'metal box with attched front faceplate' design. I was going to use cold-rolled steel since we have this at work and spot weld the face to the main chassis, but then I got to thinking that perhaps the steel might interfere with the coils. Nothing wrong with steel. Altoid mint tin-plated steel boxes are very popular for QRP projects, and tin-plated boxes are often used for screening on commercial RF PCBs. 73, Leon |
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