[sdiy] Black Magic oscillator cans

[John L Marshall]

According to the ARRL handbook crystals can be tuned with a variable
capacitor over a range of 50kHz to 200kHz.

Take care,
John
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----- Original Message ----- 
From: "Glen" <mclilith at charter.net>
To: "John L Marshall" <john.l.marshall at gte.net>; "Synth-Diy"
<synth-diy at dropmix.xs4all.nl>
Sent: Sunday, July 20, 2003 1:18 PM
Subject: Re: [sdiy] Black Magic oscillator cans


> At 02:43 PM 7/20/03 , John L Marshall wrote:
> >Crystals can be trimmed to an exact frequency with a small variable
> >capacitor, either in series or parallel.
>
> I'm aware of that, but the tuning range is fairly limited. The amount of
> tuning range is also affected by the oscillator circuit design, as well as
> the crystal itself. Some circuits and crystals are more "tunable" than
others.
>
> Do you happen to know if a "typical" 2 MHz crystal oscillator could be
> tuned this way to a frequency of 2.00024 MHz? I don't have much "hands-on"
> experience with the limits of a crystal's tuning range.
>
>
> later,
> Glen Berry