[HBR] Chassis kits

[Bob Betts]

Hi Guys:
Just wanted to jump in.
I have been making shielded cans for years with brass shim stock. Generally I buy the .004" thick brass on a 6" wide roll, but there's other thicknesses and widths (ebay is a good source). I cut it with scissors and it bends very nicely. You can score it with a scribe and it folds nicely along the scribe line. For a 4-sided can, I make 5 sides so that the last side overlaps the first. Then it can be easily soldered into a square tube. They make very nice looking finished product, especially if you paint the finished can. I have not done this for IFs, but have made dozens of cans for RF Preamps, converters, mixers, oscillators, etc.

Anyhow, just a suggestion.

Bob, N1KPR

 
http://www.bobsamerica.com  http://www.youtube.com/n1kpr

Engineering: Where Enigma meets Paradox


________________________________
 From: Brian Burns <brianburns1066 at gmail.com>
To: 'HBR Receiver List' <hbr at mailman.qth.net> 
Sent: Tuesday, November 25, 2014 11:43 AM
Subject: Re: [HBR] Chassis kits
 

Hello Bill,

Yes, there are heavy aluminum foils available--I found a couple by googling.
And there is always aluminum roof flashing readily available, and easily cut
to size with tin snips. 

By the way, a very superior type of tin-snip has been available for years
called "Lever Snips". Compound leverage, and you can cut in straight lines
with them.

Cheers,

Brian


-----Original Message-----
From: HBR [mailto:hbr-bounces at mailman.qth.net] On Behalf Of
ke9xq at charter.net
Sent: Tuesday, November 25, 2014 8:23 AM
To: HBR Receiver List
Subject: Re: [HBR] Chassis kits

Brian and group
    Do you have the Impoverished Radio Experimenters books???
Love them, and at least one article that I remember at the moment, is IF
cans built with aluminum foil draped over the cardboard forms.
I think there was more, but can't think of them at the moment.  While I know
that will work OM, I do not plan on using the idea at least with the HBR
set, as I want to avoid tears tares teirs terring tearing of the foil et
cetera : )  For a mock up that would be great but for a long haul project,
foil is too fragile.  The wood would stand up to most of the abuses, but it
just might end up looking terrable after I get my mits on it a few times : )
Now that I'm thinking of this, that alunimum foil does come in different
thickness' but at least I'm going to avoid it.
Looks like everyone is thinking here : )
73
Bill


On Tue, Nov 25, 2014 at 10:07 AM, Brian Burns wrote:

> Hello All,
>
> One method that hasn't been mentioned is what I call "Cabinetmaker's 
> Delight" construction. Remember the "Plumber's Delight" construction 
> method for beam antennas that was so popular back in the day?
>
> This is just a thought experiment for me at this point. What about 
> plywood framing with heavy aluminum foil as a conductive covering? 
> This would allow connecting the parts with wood screws so that they 
> could be disassembled for convenience.
> Basic mounting of components could be done on a heavy aluminum plate, 
> and smaller aluminum plates could be added in. Mix and match as 
> necessary.
> Plywood is mechanically stiff, a good thermal insulator, cheap, and 
> easy to work. Has anyone tried this type of construction?
>
> Cheers,
>
> Brian
>
>
>
>
>
>
>
>
>
>
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