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Re: LF: Re: Re: Loading coils and shorted turns

To: [email protected]
Subject: Re: LF: Re: Re: Loading coils and shorted turns
From: "jannsen" <[email protected]>
Date: Fri, 26 Oct 2001 19:09:46 +0200
References: <[email protected]> <[email protected]>
Reply-to: [email protected]
Sender: <[email protected]>
Dick Rollema schrieb:
To All from PA0SE

Dear OM,

Of my loading coil about 1/5 is shortcircuited. Leaving it open makes no
difference in aerial current.
There could be some difference in coil losses of course but the effect of
this is diluted by the much larger earth resistance in series. Measuring Q,
as Rik did, could show a difference, if any.

73, Dick, PA0SE
Hi All,
the not used windings of the static part of the coil (400mm diameter, 48 windings of 1x75 litze(4mm diam.)) I too leave open (35 windings !). but reading here on the reflector that it could be wrong I made a test:
I shortcircuited the unused. no change of the aerial current after retuning
the variometer.

BUT:
I observed a strange behavior of the SWR meter connected between the 50m coax
to the TRX and the coil. in the first 30msec or so at the start of any keying the TRX the needle of the meter vibrated like a friendly dogs tail. every dash and dot the same behavior.
result:
I threw the shortcircuit wire away. it landed on neighbors farmyard.
regards
Uwe/dj8wx



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