[R-390] Why 6DC6?

[Jordan Arndt]

Howdy Roy et al.... being home with a 102F fever, gives a little light
headedness and some time to search for something to distract my attention....
try this:

http://www.downeastmicrowave.com/PDF/IP3.PDF

While not exactly in simple terms, the visuals help to understand what the
measurement means.... 73 de Jordan....

Roy Morgan wrote:

> At 03:42 PM 9/6/02 +0000, Philip B Atchley wrote: ....
> >Yes, I do have some 6BZ6 tubes here and two separate identical Marconi
> >signal generators but I really don't have all the test fixtures and
> >additional equipment to run a total analysis comparing both tubes
>
> Phil,
>
> The ARRL handbook tells how to build a "hybrid signal combiner". It appears
> pretty simple (one toroid, a few resistors, connectors and a box.)  I plan
> to build one when I can.
>
> >  to get optimum results one would have to adjust the
> >cathode bias, screen resistors etc to get a fair comparison of tubes and
> >I don't feel like cutting into my R-390A (that would be blasphemy).
>
> I have an RF deck from a "junker" radio that I expect to do such
> experimenting with.  HSN carried an article or series of them using
> frame-grid tubes in  the first RF and  some mixer stages.  Changes to the
> circuits were involved.  Greatly improved intermodulation and
> "overload"  performance, and much lower noise were claimed.  Others have
> since reported that the improvements were not worth the effort.
>
> PS:
> Who can explain in simple terms what "third order intercept" means??
>
> Roy
>
> - Roy Morgan, K1LKY since 1959 - Keep 'em Glowing!
> 7130 Panorama Drive, Derwood MD 20855
> Home: 301-330-8828 Work: Voice: 301-975-3254,  Fax: 301-948-6213
> roy.morgan@nist.gov --
>
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