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Re: LF: Can I match 2 frequencies with one loading coil?

To: rsgb_lf_group[email protected]
Subject: Re: LF: Can I match 2 frequencies with one loading coil?
From: Mal Hamilton <[email protected]>
Date: Thu, 28 Jun 2018 19:55:55 +0100
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I use aircore loading and matching
Use 2 coils and SW between them for desired band

On 28 Jun 2018, at 17:54, DK7FC <[email protected]> wrote:

Hi Chris,

It will depend on your antenna size and the system Q. Just try and see what 
happens. On RX, mnothing should become damaged. With the coil switched to LF 
there could be enough signal on MF. As long as e.g. a ferrite transformer in 
the line is can handle LF, it will also handle MF. Just about a factor 3 in 
frequency. But you could use further components in the shack to get more signal 
on MF then, like a parallel L which pulls the residual resonance towards higher 
Just some spontaneous thoughts.

73, Stefan

Am 28.06.2018 17:18, schrieb Chris Wilson:
> Hello  LF'ers and MF'ers
> Can I, for RX only, use my single loading coil to match 2 receivers to
> my single (LF at the moment) antenna , one on MF and one on LF? I
> envisage 2 feedlines to the shack. How important is a 50 Ohm match on
> the MF one? If I need a second matching transformer for MF what
> toroidal core should I use? Thanks.  2E0ILY

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