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| To: | <[email protected]> |
|---|---|
| Subject: | LF: Re: Loading Coil Q |
| From: | "PA0WFO" <[email protected]> |
| Date: | Thu, 6 Jul 2006 13:51:19 +0200 |
| Delivered-to: | [email protected] |
| References: | <[email protected]> |
| Reply-to: | [email protected] |
| Sender: | [email protected] |
|
To
All ,
Lacking a "Q"meter I use
the following procedure :
Connect the coil in
series with a variable capacitor to a noise bridge with the RX output of the
bridge to a receiver ( small bandwith of a few hundred cycles ) on 137
Khz . Bring the the bridge to resonance with the variable capacitor and the
internal potmeter of the bridge and read the loss resistance of the coil
.
The Q factor is the Xl of
the coil divided by the loss resistance . With this procedure the "Q"is measured
on the working frequency . With a good shielded Rx and bridge very precise
measurements are possible . By replacing the capacitor with the real life
antenna , measurements of the total resistance to be matched is possible
.
73, William
PA0WFO
----- Original Message
-----
From: "Gary - G4WGT"
<[email protected]>
To: "LF (Rsgb LF Group)"
<[email protected]>
Cc: "LW Wave"
<[email protected]>
Sent: Thursday, July 06,
2006 11:38 AM
Subject: LF: Loading Coil
Q > > Thanks to all for additional comments on the previous thread 'LF Loading > Coils'. > > Continuing on the theme of loading coils, is there a simple method of > calculating the 'Q' of an LF loading coil without using a 'Q' meter (a > device I have not got access to). I would like to carry out my own > tests/experiments on my antenna system, it can only add to my knowledge > base. > > 73 > > Gary - G4WGT. > > > |
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