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Re: LF: RE: Analog oscillators

To: [email protected]
Subject: Re: LF: RE: Analog oscillators
From: Stefan Schäfer <[email protected]>
Date: Sat, 07 Jul 2012 23:11:17 +0200
In-reply-to: <804F85B8E2764C8C9D9007462F586A67@JimPC>
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Hello Jim,

Am 07.07.2012 20:55, schrieb James Moritz:
When you replace the existing inductor with a high-Q one, you will find that the loop gain of the circuit is increased due to the higher Q, and you will be able to use a lower gain/reduced transistor bias current.
Give me some days. Soon i will report about the progress. A T50-6 os at my parents QTH where i will be in some days.


For CW enthusiasts, I am suprised more use is not made of simple LC VFOs. A drift of +/- 100Hz during the time taken for a QSO is usually not noticeable,
Oh i would say 100 Hz is a bit hard but 20 Hz should be OK in my opinion.

and it is easy to achieve this in the LF/MF range. Also, the narrow tuning range means an elaborate tuning mechanism with reduction gearing is not needed - just a knob with a simple hand-marked scale is adequate.
EXACTLY!!!!



73, Stefan/DK7FC

It is much simpler than the schemes needed to obtain an LF/MF signal by dividing/mixing down the output of an HF rig, etc. A VFO is also a much better practical choice than a crystal oscillator, which leaves you stuck on a fixed frequency.

Cheers, Jim Moritz
73 de M0BMU


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