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LF: Re: 134.1Khz

To: <[email protected]>
Subject: LF: Re: 134.1Khz
From: "Roelof Bakker" <[email protected]>
Date: Wed, 9 Aug 2006 18:19:41 +0200
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Hello Laurence,

Glad to hear the design is working fine. Though there are now more than 120 around, as far as I know, it is the first one in Asia!

The only difference to the original design is a slightly longer (cap) aerial, added another few cms there, and the inter-stage coupling increased to 680pF from 560pF, only because thats what they have and not to improve the LF side <<

This value is not very critical, but it should be in the order of > 100 nF (0.1 �F) to achieve good VLF performance. 680 pF is a little on the low side, I guess.

Adding a few cm length to the PCB antenna does not make much of a difference. Doubling the size gives only 3 dB(m) more signal. It has been designed to prevent overload of the receiver, but again nothing critical.

I am following your endeavers with great interest.

Best regards,

Roelof Bakker, pa0rdt





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