I believe many Collins radios were also aluminum. At least my 75A4 is. Also
the big Hammarlund SP-600 is aluminum.
I'm sure it's easier to work with.
I've had 3 or 4 Century 21's and never had a hum problem.
On Thu, Jun 8, 2017 at 11:10 PM, Dukes HiFi <dukeshifi@comcast.net> wrote:
> Ten Tec once stated directly in their ads that they used Aluminum because
> it was lighter. I remember this because many hams at the time complained to
> Ten ten that TenTec radios felt sort of cheap since they were so light. The
> Ten Tec comment was a way to defuse that concern. There was never any
> technical reason for using Aluminum. The use of Aluminum goes all the way
> back to the Power Mite, their first product.
>
> Drake also used Aluminum for the main chassis and the separators for the
> PC boards as well. This was a departure for them since all previous chassis
> were either steel or the blasted Copper plated steel.
>
> As I said previously, in agreement with Carter and others, mag shielding
> MUST be magnetic material. Mumetal is nice because its permeability at low
> frequencies is 30,000 times that of cold rolled steel!
>
> At higher frequencies (>1 GHz) this advantage drops to unity so not so
> good at UHF. Too bad because I have an application in which I need good
> magnetic shielding at 10 GHz.
>
> Gary
>
> W0DVN
>
>
> > On Jun 8, 2017, at 3:18 PM, Carter <k8vt@ameritech.net> wrote:
> >
> > On 6/8/2017 3:45 PM, Josh Gibbs wrote:
> >> I'm learning a lot about shielding... tons of good resources on the Net.
> >> This article was particularly useful:
> >>
> >> http://www.ets-lindgren.com/pdf/emctd_1293_weibler.pdf
> >>
> >> The fact that Ten-Tec used aluminum when steel would have been cheaper
> is
> >> interesting, especially since steel is much better at attenuating
> magnetic
> >> fields. Perhaps they just had a bunch of aluminum around, so they used
> it.
> >> It is much easier to cut and bend than steel.
> > Again, I don't think aluminum will do anything, as it is non-magnetic;
> cardboard would work as well.
> >
> > Anyone have the definitive answer on this aluminum issue -- and what TT
> was hoping to accomplish with the aluminum around the xfmr?
> >
> > Carter, K8VT
> > _______________________________________________
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> > TenTec@contesting.com
> > http://lists.contesting.com/mailman/listinfo/tentec
>
> _______________________________________________
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