[sdiy] Aluminium PCBs

[Nick Liebrecht]

Hi,

I agree 100% with Florian on this.  If you want stability and
excellent tracking, the oven works great.  My Serge oscillators, which
use an oven track each other over greater than 10 octaves (pos and neg
CVs) and they track 1 V/oct over at least 6 or 7.*

-Nick

*okay, so I may be a little biased, but I do speak the truth.

On 3/28/09, Florian Teply <usenet at teply.info> wrote:
> Am Freitag 27 März 2009 10:30:08 schrieb cheater cheater:
>> What's this 'loss' thing?
>>
> Umm, this is some effect in High frequency electronics: Isolators carrying
> electric fields, a common usage would be capacitors, but also transmission
> lines in high-frequency circuits, do so quite well at low frequencies (low
> being here somewhat below a couple hundred MHz). Basically it breaks down to
> the loss tangent of the dielectric material in question, which usually is
> somewhat frequency-dependent (that is, it's getting worse at higher
> frequencies). But at frequencies we're most likely to encounter in SDIY,
> this
> doesn't matter.
>
>> Nick: do you think that they would be good for oscillators, to
>> maintain thermal inertia?
>>
> I'm not Nick, but i'll drop in my 2 cents anyways ;-)
> Thick Aluminum-clad PCBs are commonly used in High-Power LED stuff where one
> needs to get the heat away efficiently. AFAIK it doesn't add much thermal
> capacity though. My best bet would be some sort of oven heating for
> high-stability oscillators as is done in RF because that avoids tempreature
> change by actively heating to a constant tempreature somewhere above ambient
> temperature levels to be encountered during operation.
>
> HTH,
> Florian
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