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Content preview: May be Mal But once again Jim has the answer to this problem ..if you can find his articles after Google trashed the uk500khz news group , I think Jose R predicts a 6 dB gain by changing to PSK from the Opera on/off keying but that would prevent most of the LH/MF usage [...] Content analysis details: (0.2 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [80.12.242.42 listed in list.dnswl.org] 0.2 STOX_REPLY_TYPE STOX_REPLY_TYPE X-Scan-Signature: 77d68ebd44814a6def4d7158b7296e78 Subject: Re: LF: Re: Re: Re: DK0SWF antenna Content-Type: text/plain; format=flowed; charset="utf-8"; reply-type=original Content-Transfer-Encoding: 8bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.1 required=5.0 tests=MISSING_OUTLOOK_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 x-aol-global-disposition: G x-aol-sid: 3039ac1d608a504e2dc866e7 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none May be Mal But once again Jim has the answer to this problem ..if you can find his articles after Google trashed the uk500khz news group , I think Jose R predicts a 6 dB gain by changing to PSK from the Opera on/off keying but that would prevent most of the LH/MF usage G.. -------------------------------------------------- From: "mal hamilton" Sent: Monday, September 10, 2012 6:13 PM To: Subject: Re: LF: Re: Re: Re: DK0SWF antenna > Wolf > Overall considerations, Data modes that need Linear amps are very > inefficient. It is preferable to choose modes that use C, D or E > amplifiers like CW or QRSS one level demodulation. Two level might be a > consideration like OPERA. > Linear AB2 etc 40% efficient, class D or E 90% . It is the same with SSB > that needs a linear amp whereas CW with a class D is way ahead at 90% plus > efficiency. > > mal/g3kev > > ----- Original Message ----- > From: "wolf_dl4yhf" > To: > Sent: Monday, September 10, 2012 3:44 PM > Subject: Re: LF: Re: Re: Re: DK0SWF antenna > > >> Hello Christian, >> >> I have a few MOSFETs type HUF 75343 P3 to donate... they are 75 A, 55 V, >> and Rds_on = 9 mOhm. >> Only disadvantage is a relatively large gate capacitance, but despite >> that they work reasonably well in my MF PA (in linear mode, with very >> low impedance drive). I originally used them in my LF transverter, where >> I never managed to kill any. Despite their "270 Watts" dissipated power >> rating they need good cooling when operated in linear mode. >> >> HW ? >> >> 73, >> Wolf DL4YHF >> (QRL: Bünde, not very far from you...) >> >> >> Am 10.09.2012 00:03, schrieb C. Groeger: >> > Hello Stefan, >> > Sorry, my tx broke down, I had to stop. >> > You were here 599 as strong as Wolf df0wd who is my mf neighbour! >> > I'll Call you again next week with new mos fets... >> > >> > 73 >> > Df5qg >> > >> > Christian Groeger >> > >> > Stefan Schäfer schrieb: >> > >> >> I'll join in too, soon. My temporary MF grabber is at >> >> http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_MF_Grabber.html, >> >> active during i am active... >> >> >> >> 73, Stefan >> >> >> >> Am 09.09.2012 21:24, schrieb C. Groeger: >> >>> Ok, mal...give me 10 minutes, I'll be there! >> >>> >> >>> Christian Groeger >> >>> >> >>> mal hamilton schrieb: >> >>> >> >>> >> >>>> Christian >> >>>> Looking out for you at present on 472.5 but nil hrd so far. Just had > a QSO >> >>>> with DF0WD >> >>>> 73 De mal/g3kev >> >>>> >> >> > >