Dear OMs, just a question strait forward: What componnets I should choose for a low pass filter for 136 kHz and 472 kHz, two filters to be designed. 136 kHz: Pin abt 1,5 kW 472 kHz: Pin abt 0,5 kW SW
Dear OMs, thank You for the quick answer just in one day. Isn t it nice to get replies from technical experts just in a few hours? I compared Your drafts with an already built construction of me usin
Dear OMs, I need `nt a full switching circuit, as I have a power output of the vac relais (Jennings dpdt (2 mal um), too slow for qsk) in receive path of abt -17 dbm in transmit mode, and I wish to a
Gesendet: Freitag, 21. April 2017 um 22:33 Uhr Von: "Hans-Albrecht Haffa" <[email protected]> An: [email protected] Betreff: Aw: Re: LF: A transductor for power regulation? Dear Lowfers, years
Hallo Stefan, definitely wrong, what You say. The stray field of the centre leg winding puts the yokes to saturation. Stray field closes throug the outer legs. This means the stray field of the centr
Dear OMs, this weekend I will call cq with my new tx on 472,50 kHz in the evening, abt 19. 00 utc on saturday and sunday. Please lisn to my sigs. Mode cw aural cw. TX: ENI 3200 AMT, driven to 250W...
Dear OMs, thank You for Your patience listening t my sigs. From my Log: Date/ utc/ call/ frequ/ sent/ rcvd/mode/ remarks 13.1.17 16.26h I 2 BBJ 472k 599 559 A1A 16.57 IK2DE 579 569 18.37 DL4HG 339 55
Dear Wolfgang, a suitable replacement for E310 is BF245, BF246, still available. Check pin arangement and gain factor. 55, Hans-Albrecht DK 8 ND Gesendet: Montag, 22. Januar 2018 um 18:08 Uhr Von: "W
Dear OM Elmer, depending on the power You intend to use, I recomend homebrew Dummy Loads, indeed attenuators only up to a power of 100 Watt. Wovings of bifilar wound fibre glass filaments and Nickel
Dear OMs, I will be active this weekend in calling cq on 472,50 kHz or nearby in cw. P =-2 db(kW) 60 Ohm, Ant 20 m Vertical. Stns in south Germany are kindly asked to be active. My queswtions: Is non
Dear OMs, dear Paul, You are pointing to a general problem in driving fets, what is not easy, it is the same sophisticated jopb as with bipolar transistors in power electronics, in Your case a switch
Dear Ricardo, sri, soon after I had sent the e-mail to the reflector, I had an insulation breakdown in the antenna. So, no cq on friday evening. I do this now on saturday, 472,50 kHz. What happened:
Thanks to Dix, DJ6CB and PA9M, for ur report to my sigs on 472,5 kHz. It seems to be that I must have a receiving problem, thoug my rig ist unchanged since Jan. 2018. Here in South Germany I cannot r
Dear Jim, please be so kind to send me a copy of Your articlae. 55, Hans-Albrecht _____________________________________________________________________ Der WEB.DE SmartSurfer hilft bis zu 70% Ihrer O
Dear OMs,thank You for Your reply. I have been qrv this morning, without success. I have called abt three times cq. 1808z QSO DF6NM (dfcw3) me qrs3 both OO, for me aural cw was possilble (rst449 at a
Dear OMs, on my new qth JN48HQ on Saturday I heard DK4U (qrss10) mm 20.11z and RU6LA mm Sunday 6.1.2007 15.20z wkd DL4AU mm/oo.0n 137k73 It seems that there are periods, where for me traffic is possi
Dear OMs, thank You for Your replies. Next weekend I will be qrv again on 137k77 in qrss3/ qrss10. It is a challenge to transmit from a little cottage with garden in urban noise environment. Please a
Dear OMs, At Helmut Singer Elektronik (http://www.helmut-singer.de ) I have bought an Radio Accessories Funkzubehör MIL Clansman HEADSET TYP II, with useful noise cancelling. I just had to build an p
Dear Lowfers, sooner or later I am looking for an TX for 136 kHz, giving me reasonable more output than my present one with abt. 70 W_60 Ohm. Power supply should be DC or 230V single phase, my cottag
Dear Mal, it seems for me, that Our band 136k is not anymore a challenge for us. I know that I have no more contacts with DK 7 SU on Sunday morning, but now, as on new qth my station is qrv again I h
