Re: LF: TXing 2200m WSPR

To:	[email protected]
Subject:	Re: LF: TXing 2200m WSPR
From:	Andy Talbot <[email protected]>
Date:	Sun, 24 Dec 2017 12:40:15 +0000
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Are you sure your 50uH choke is doing its job? 9t to get 50uH suggests ferrite witout a gap. IN which case FDC thought the winding will be saturating the ferrite, driving it into non linearity and reduced L

Use iron dust or GAPPED ferrite

Andy G4JNT

On 24 December 2017 at 12:26, DK7FC <[email protected]> wrote:

Hi Paul,

Am 23.12.2017 23:36, schrieb N1BUG:

For anyone trying to follow along, this is my current version:

http://n1bug.com/ASB_LF_Amp-20171223.jpg

The circuit looks good to me now. Maybe it helps to use a low pass filter in T configuration instead of a PI config. The T config starts with a series L. The PI config starts with a parallel C. That could make a significant difference for the harmonics.

73 and Merry christmas, Stefan

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Re: LF: TXing 2200m WSPR, (continued) Re: LF: TXing 2200m WSPR, N1BUG Re: LF: TXing 2200m WSPR, DK7FC Re: LF: TXing 2200m WSPR, N1BUG Re: LF: TXing 2200m WSPR, DK7FC Re: LF: TXing 2200m WSPR, N1BUG Re: LF: TXing 2200m WSPR, DK7FC Re: LF: TXing 2200m WSPR, N1BUG Re: LF: TXing 2200m WSPR, Steve Re: LF: TXing 2200m WSPR, N1BUG Re: LF: TXing 2200m WSPR, DK7FC Re: LF: TXing 2200m WSPR, Andy Talbot <= Re: LF: TXing 2200m WSPR, N1BUG Re: LF: TXing 2200m WSPR, Riccardo Zoli Re: LF: TXing 2200m WSPR, Andy Talbot Re: LF: TXing 2200m WSPR, N1BUG Re: LF: TXing 2200m WSPR, Andy Talbot Re: LF: TXing 2200m WSPR, N1BUG Re: LF: TXing 2200m WSPR, Andy Talbot Re: LF: TXing 2200m WSPR, Andy Talbot Re: LF: TXing 2200m WSPR, Chris Wilson Re: LF: TXing 2200m WSPR, Andy Talbot

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