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Re: LF: TXing 2200m WSPR

To: [email protected]
Subject: Re: LF: TXing 2200m WSPR
From: N1BUG <[email protected]>
Date: Sun, 24 Dec 2017 11:07:56 -0500
In-reply-to: <CAA8k23RghsUZT2-PSSg4Mr90D7WX5TvERuyZU3tjExUs=tzLTg@mail.gmail.com>
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On 12/24/2017 07:40 AM, Andy Talbot wrote:
Are you sure your 50uH choke is doing its job?

No. I'm not sure of anything! I'm a HF/VHF/UHF and tube amplifier guy who decided to get on LF. Working with FETs and ferrite is all new to me.

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

Yes, I am using ferrite without a gap. I have an iron dust T-106-2 core available but would have to use rather small enameled wire to get the required 61 turns for 50 uH, or else more than one layer of winding. I could temporarily borrow a T-157-26 core from another project. That would require only 23 turns which would easily fit being it's a rather large core.

Unfortunately I now have a rather large amount of ice on the antenna and cannot do any more testing. It would appear this ice isn't going to melt for at least a week. :(

73,
Paul N1BUG

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