Re: LF: Dumb homebrewer - Advice needed

[Daniele Tincani <danieletincani@yahoo.com>]

Many thanks to Petr and Marco for their replies.

I suppose the same considerations apply to stray capacitances? For example, connecting to the 30-350pF tuning capacitor by using a twisted pair of wires (10cm long) or running the same wires as separate as possible from each other has no relevance. Correct?

Best regards

Daniele

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From: Marco IK1ODO -2 <ik1odo@spin-it.com>
To: rsgb_lf_group@blacksheep.org
Sent: Wed, February 2, 2011 2:47:13 PM
Subject: Re: LF: Dumb homebrewer - Advice needed

At 13:51 02-02-11, you wrote:
> Hello LF,
>
> I would like to improve a bit my home-made pre-selector for LF/MF. I would appreciate very basic advice on "mechanical" aspects like the following: the pre-selector has some molded inductors that can be selected by means of a rotary switch (band selector). Is it advisable to mount the inductors directly on the switch terminals or on a separate (small) PCB? Shorter is better in this case or not?
>
> Best regards
> Daniele

With Lambda=2200 m everthing shorter than L/10 (220 m) is "short" :-)
Don't worry, 30 cm at 137 kHz is like a low inductance microwave bonding. Mechanical considerations prevail.

73 - Marco IK1ODO