Hi Chris,
ok, I hope I have now understood your set up and what you may possibly want to
change.
Present configuration:
>2 X amps to combiner via 2 off 12 inches Teflon coax cables : Combiner
>to LPF via 12 inches Teflon co-ax : Combiner to outside about 40 feet
>RG-213 co-ax : Outside is impedance matching transformer on top of
>loading coil / variometer : Impedance matching transformer to loading
>coil via 12 inches RG-213 : Loading coil feeds vertical section of
>antenna directly.
And from an earlier post by you:
>>Can I wind the isolating
>>transformer as a 1 : 1 and do impedance matching (which changes with
>>weather / foliage growth) indoors using a tapped combiner auto
>>transformer?
So you want to modify the combiner-autotransformer into a tapped one
and OTOH modify the tapped isolation transformer into a non-tapped 1:1 one.(?)
This would be not a good idea.
The combiner XFM would not work any more,the LPF would not work any more
properly.
Both need to see 50 Ohm.
Even if you cancel out the antenna/feeder reactance by the loading
coil/variometer you are left with a
very low real part of impedance of a few Ohm.
So beside the malfunction of the combiner and the LPF you would get a loss of
about 2dB on the 40 feet
coax (assuming 2 Ohm for the real part).
73
Clemens
DL4RAJ
>-----Original Message-----
>From: [email protected]
>[mailto:[email protected]] On Behalf Of Chris Wilson
>Sent: Saturday, June 24, 2017 9:44 PM
>To: Clemens Paul
>Subject: Re: LF: RE: Transformer questions.
>
>Hello Clemens,
>
>It is between the outdoor end of the RG-1213 co-ax and the loading
>coil, although it's not 1 : 1 at the moment, it has taps on the
>primary and the secondary to fiddle with.
>
>
>
>Saturday, June 24, 2017, 7:45:48 PM, you wrote:
>
>> And where is the 1:1 isolation transformer inserted?
>
>> 73
>> Clemens
>> DL4RAJ
>
>
>
>
>
>
>--
>Best regards,
> Chris mailto:[email protected]
>
>
>
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