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[82.70.254.222]) by smtp.gmail.com with ESMTPSA id t24sm9886304wra.44.2017.04.16.04.48.48 for (version=TLS1 cipher=AES128-SHA bits=128/128); Sun, 16 Apr 2017 04:48:48 -0700 (PDT) From: Chris Wilson X-Google-Original-From: Chris Wilson Date: Sun, 16 Apr 2017 12:48:47 +0100 X-Priority: 3 (Normal) Message-ID: <731997437.20170416124847@gmail.com> To: rsgb_lf_group@blacksheep.org In-Reply-To: <15b72b3360e.marcocadeddu@tin.it> References: <15b72b3360e.marcocadeddu@tin.it> MIME-Version: 1.0 X-Scan-Signature: c0336009bd9bab526ca27d297ea7579a Subject: Re: LF: Happy Easter MF LF VLF Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit 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 X-Scanned-By: MIMEDefang 2.75 Status: RO X-Status: X-Keywords: X-UID: 11340 Hello Marco, Sunday, April 16, 2017 A very happy Easter to you too, Marco. From myself and my FET's alive and switching, and from those in the great recycling bin in the sky! I hope your FET's survived the evening and live on to bravely go where no FET has gone before. I am amazed by pretty much everything Stefan does, I am hope he has some financial backing, just keeping him in copper wire and toroids looks like a job fro a wealthy man! Amazing stuff on VLF, simply amazing. All the best Marco. > Best wishes to all the group. > A special one to Chris and his brave FEts ;-) > Tonite while the QRP TX is on on MF, a couple of proud FET will > challenge for the last time on my QRO TX: > will apply low DC power and then increase sloooooooooowly till the > standard level monitoring everything. > If also this last trial will produce smoke instead of RF power will try > an H Bridge or half bridge Decca style! > I'm just concerned how to find place for the inductor.. the box is a > bit crowded ;-) but with the low required Q probably can do it with a > low permability ferrite (I have in the junk an FT240-61 that should be > a reasonable compromise). > By the way, amazed from the picture of the huge stack of toroids used > from Stefan for the fine tuning! > 73 de Marco, IK1HSS -- Best regards, Chris mailto:dead_fets@gmail.com