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LF: RE: Transformer questions.

To: <[email protected]>
Subject: LF: RE: Transformer questions.
From: "Clemens Paul" <[email protected]>
Date: Sat, 24 Jun 2017 12:34:18 +0200
In-reply-to: <[email protected]>
References: <[email protected]>
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Thread-index: AdLsGP3iwElf3GfJQTm8OBl09/rmuwAuW+TQ
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 



>-----Original Message-----
>From: [email protected] 
>[mailto:[email protected]] On Behalf Of Chris Wilson
>Sent: Friday, June 23, 2017 2:04 PM
>To: [email protected]
>Subject: LF: Transformer questions.
>
>Hello LF'ers,
>
>Two 500 watt Class D amps combined. The output transformer of the
>combiner is now an auto transformer. This feeds, via RG-213 to
>outdoors, where an isolating transformer, that is a conventional
>primary / secondary transformer with taps for impedance matching then
>feeds my loading coil and then the antenna. 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? I want to change the impedance matching / isolating
>transformer anyway as it runs a bit hot on long TX sequences. I tried
>an auto trans former as the impedance matching one outside, but had
>serious RF into the mains causing various issues, a conventional
>isolating / impedance transformer fixed all that, so I assume it needs
>to stay, even as a 1 :1 ? Thanks.
>
>  
>
>-- 
>Best regards,
> Chris                          mailto:[email protected]
>
>
>
>---
>Diese E-Mail wurde von AVG auf Viren geprüft.
>http://www.avg.com
>



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