[Hallicrafters] s-76 - correction

[mac]

All

The frequency of the 453 is 85, not 50 KHz.  Senior moment......... :^(

Dennis D. W7QHO
Glendale, CA



On Mar 12, 2010, at 10:06 AM, mac wrote:

> For a given circuit Q, the bandpass of a resonant circuit is a fixed
> percentage of the resonate frequency.  Thus, a lower frequency circuit
> will provide a narrower bandpass than a higher frequency circuit .
> For example - 5% of 500KHz = 25 KHz vs. 5% of 50 KHz = 2.5 KHz.  Not
> quite that simple in practice, of course but that's the principal of
> the thing.
>
> As to why the popularity of 50 KHz, I suspect this was because this
> was the frequency of the IF in the BC-453 command receiver widely used
> as an outboard selective IF in the 50's (and up to this day).