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]
>
>
>
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