From: "Clemens Paul" <cpaul@gmx.net>
To: <rsgb_lf_group@blacksheep.org>
References: <94719482.20170623130346@gmail.com> <EFA843B116824E4B89B87C3BAAE2DB33@Clemens0811> <408186507.20170624173207@gmail.com>
In-Reply-To: <408186507.20170624173207@gmail.com>
Date: Sat, 24 Jun 2017 19:36:00 +0200
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Subject: RE: LF: RE: Transformer questions.
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Hi Chris, 

Just to be sure, you
>want  me  to  reverse  the  connections  so  the AIM is looking at the
>winding  that  would  normally go to the loading coil, and the loading
>coil  and  antenna is connected to the winding that would normally go,
>via about 50 feet of co-ax, to the auto transformer in the shack bound
>combiner?

I'm not sure if I understand your description correctly so I try with a block diagram.
Is it like this?
TRX - short coax - autotransformer - longer run of RG-213 - isolation XFM 1:1 - loading coil - feeder - antenna

73
Clemens
DL4RAJ 

>-----Original Message-----
>From: owner-rsgb_lf_group@blacksheep.org 
>[mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Chris Wilson
>Sent: Saturday, June 24, 2017 6:32 PM
>To: Clemens Paul
>Subject: Re: LF: RE: Transformer questions.
>
>Hello Clemens,
>
>Saturday, June 24, 2017, 11:34:18 AM, you wrote:
>
>> Hi Chris, 
>
>>>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? 
>
>> This would be possible but more or less lossy.
>> What is the impedance as seen by your AIM when you measure on the
>> secondary side of the 1:1 isolation transformer
>> with antenna and feeder connected to the primary winding?
>> How long is the coax between the isolation- and the auto-transformer?
>> With these data it is easy to predict the losses quite accurately.
>
>> 73
>> Clemens
>> DL4RAJ 
>
>I'll  do  some testing tomorrow, been trying to gain a bit of vertical
>height  today  and  have  run out of "play time". Just to be sure, you
>want  me  to  reverse  the  connections  so  the AIM is looking at the
>winding  that  would  normally go to the loading coil, and the loading
>coil  and  antenna is connected to the winding that would normally go,
>via about 50 feet of co-ax, to the auto transformer in the shack bound
>combiner?
>
>Thanks for your help!
>
>
>
>
>-- 
>Best regards,
> Chris                            mailto:dead.fets@gmail.com
>
>
>
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