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41. Re: LF: Re: Class D current spikes (score: 1): Author: Eric NO3M <[email protected]>; Date: Sun, 24 Feb 2019 13:04:52 -0500; Andy This recommendation is all well and good, but seems applicable to only CW where either the operator is manually keying or using computer controlled keying with a constant carrier input. With dig; /rsgb_lf_group-archives/html/rsgb_lf_group/2019-02/msg00210.html (14,696 bytes)
42. Re: LF: Re: Class D current spikes (score: 1): Author: Eric NO3M <[email protected]>; Date: Sun, 24 Feb 2019 16:00:58 -0500; Jay Just one FET (59N25) on each side. On 2/24/19 3:26 PM, [email protected] wrote: Eric One or two FETs per phase? Jay W1VD; /rsgb_lf_group-archives/html/rsgb_lf_group/2019-02/msg00213.html (11,300 bytes)
43. Re: LF: Class D current spikes (score: 1): Author: Eric NO3M <[email protected]>; Date: Mon, 25 Feb 2019 11:13:34 -0500; Chris, et.al. N1BUG relayed the same information regarding the U3S and class-D amp behavior, so your observation is not a one off... I have a series of scope captures from my W1VD amp showing huge vo; /rsgb_lf_group-archives/html/rsgb_lf_group/2019-02/msg00221.html (10,619 bytes)
44. Re: LF: Class D current spikes (score: 1): Author: Eric NO3M <[email protected]>; Date: Tue, 26 Feb 2019 07:04:43 -0500; Don't have a U3S to test with here, but the normal drive chain is: K3 (10.137 khz out) xvtr (137 khz out) 137 khz LPF Doubler (trifilar xfmr, BAT41 schottky diodes) Tuned filter (parallel coil + cap; /rsgb_lf_group-archives/html/rsgb_lf_group/2019-02/msg00237.html (12,219 bytes)
45. Re: LF: Class D current spikes (score: 1): Author: Eric NO3M <[email protected]>; Date: Tue, 26 Feb 2019 07:12:08 -0500; Or in the case of a U3S with a square wave output at CLK0 (I assume it's square)... a complete positive half cycle without any further "noise", etc.; /rsgb_lf_group-archives/html/rsgb_lf_group/2019-02/msg00238.html (10,844 bytes)
46. Re: LF: Class D current spikes (score: 1): Author: Eric NO3M <[email protected]>; Date: Tue, 26 Feb 2019 12:35:10 -0500; Just to clarify... did you say previously that the U3S also worked fine running at 1x and feeding a doubler, squarer, etc. also? Hello Eric, Yes, the output is a square wave when I use the U3S I take; /rsgb_lf_group-archives/html/rsgb_lf_group/2019-02/msg00243.html (13,268 bytes)
47. LF: 2200m wspr2 2019/03/27 (score: 1): Author: Eric NO3M <[email protected]>; Date: Wed, 27 Mar 2019 07:29:38 -0400; Good TA condx on 2200m this morning. WSPR2 transmissions received in EU: 2019-03-27 04:52 NO3M 0.137426 -31 0 EN91wr 1 DL0AO/2 JN59vk 6749 48 2019-03; /rsgb_lf_group-archives/html/rsgb_lf_group/2019-03/msg00192.html (11,353 bytes)

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