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G0FTD > AERIAL 05.02.08 19:01l 28 Lines 1010 Bytes #999 (0) @ EU
BID : 000192035PZT
Read: GUEST
Subj: Re: German Magnetic Balun
Path: IZ3LSV<IW2OHX<OE6XPE<DB0RES<ON0AR<GB7YKS<GB7SYP<GB7PZT
Sent: 080205/1701Z @:GB7PZT.#24.GBR.EU [Kidderminster] #:19200 XSERV410h
Date: Tue, 05 Feb 2008 17:01:48 +0000
From: g0ftd@gb7pzt.#24.gbr.eu (Andy)
To: aerial@eu
Subject: Re: German Magnetic Balun
G0CJM wrote:-
> Have discovered to my cost, in labour, in and out of shack, that the MB
> does not LIKE any connection to its end fed wire. If it is give a decent
> 8ft or longer of wire, on a good day it will give 1.8-52Mhz at 1.3.1 vswr
> at 100w for about ten minutes then unless the power is reduced to say 25w
> the vswr will rise. PLEASE do NOT add anything to the wire. An ATU/AMU is
> not required and it really is a good performer but leave well alone once
> bedded in. I normally allow at least 7 days for bedding in to be
> successful.
Erm, there are different grades of ferrite.
The grade and the size will effect the *saturation* point of the material.
If the grade and size of the ferrite core is only rated at 25w then
more power will saturate the core.
It's really that simple.
- Andy (providing answers for anyone who should know better by now)-
G0FTD @ GB7PZT
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