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[82.70.254.222]) by smtp.gmail.com with ESMTPSA id f4sm49153029wra.75.2017.12.29.03.26.06 (version=TLS1 cipher=AES128-SHA bits=128/128); Fri, 29 Dec 2017 03:26:06 -0800 (PST) Date: Fri, 29 Dec 2017 11:26:05 +0000 From: Chris Wilson X-Priority: 3 (Normal) Message-ID: <1071712789.20171229112605@gmail.com> To: N1BUG CC: dead.fets@gmail.com In-Reply-To: References: <1608d073056.marcocadeddu@tin.it> <4556666E6F7849679451F95BD8C43FAA@Clemens0811> <9dbb1de2-0d17-b64f-3051-fd63f1f29cc4@n1bug.com> <51D7E4AF62D34F388A618D1DEA4942D2@Clemens0811> <5ea52d97-4678-1781-e3b5-6f0d12c6a5fb@n1bug.com> MIME-Version: 1.0 X-Spam-Score: 0.0 (/) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has NOT identified this incoming email as spam. The original message has been attached to this so you can view it or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: Hello N1BUG, What does the scope show if you look at each side of the choke in the PA? I did some tests ages ago using the stacked chip caps on the PA side of the choke compared to conventional leaded caps and the difference was marked. I would certainly try a proper dust iron core for the choke, ferrite can't be right... I don't use a LPF after the U3S but my amp is "Class D" and is happy with being driven with square waves. [...] Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (dead.fets[at]gmail.com) 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid X-Scan-Signature: 739d4fb39bd02fc5a2de5437a39bb056 Subject: Re: R: Re: LF: TXing 2200m WSPR Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.8 required=5.0 tests=PRIORITY_NO_NAME autolearn=no version=2.63 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false Hello N1BUG, What does the scope show if you look at each side of the choke in the PA? I did some tests ages ago using the stacked chip caps on the PA side of the choke compared to conventional leaded caps and the difference was marked. I would certainly try a proper dust iron core for the choke, ferrite can't be right... I don't use a LPF after the U3S but my amp is "Class D" and is happy with being driven with square waves. Friday, December 29, 2017, 11:13:03 AM, you wrote: > One final thing. > Thought maybe something in the antenna was breaking down (arcing or > corona), so made another check: > I now have the capability to run the PA on 13V or 19V. At 19V I can > make more power into the antenna before the signal goes dirty, > compared to 13V. RF power is RF power. If it was something failing > in the antenna system I think it should happen at the same RF power, > no matter what DC supply voltage I use on the PA... > Paul -- Best regards, Chris mailto:dead.fets@gmail.com