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J.B. Weazle McCreath
 Post subject: Tuner L and C values
PostPosted: Wed Oct 12, 2011 12:56 pm 
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Joined: Mon Mar 16, 2009 4:43 pm
Posts: 258
Location: Saltford, Ontario, Canada
Hi Guys,

I stumbled upon an interesting tidbit of info yesterday which I'd not seen before. Regarding ballpark figures for the L and C values required for an AMU, the following was suggested:

For C - 1.0 pF. for every metre of wavelength

For L - 0.25 uH. for every metre of wavelength

Has anyone here seen this before and/or could you confirm it?

73, J.B., VE3EAR

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OErjan
 Post subject:
PostPosted: Wed Oct 12, 2011 3:55 pm 
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Location: N 64º 41' E 21º 14'
uhm did a few quick ones and would not say it is perfect but a place to start.
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qrp-gaijin
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PostPosted: Thu Oct 13, 2011 5:39 pm 
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Would these ballpark values also apply to a front-end double-tuned circuit used as a bandpass filter at the input of a receiver?
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J.B. Weazle McCreath
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PostPosted: Thu Oct 13, 2011 10:46 pm 
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Joined: Mon Mar 16, 2009 4:43 pm
Posts: 258
Location: Saltford, Ontario, Canada
I found the info in the RSGB Radio Communication Handbook, Fourth Edition. In that application it was for a parallel tank circuit, with the component reactance of j500 ohms at the operating frequency. I don't see why it wouldn't apply to a double-tuned circuit.

73, J.B., VE3EAR

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