Hi again Pieter. That is very interesting. Yes I suppose 3kHz would fit the MW/LW "grid" of 9kHz frequency allocation spacing for BC stations. The design objectives may look odd, particularly to thos
Jacek, there are a number of possible reasons why messages do not "seem" to go through the mailing list. I write seem in quotes because many do not understand the route the messages take. Also I remi
Chris, the air-cored coils will be less lossy than those with ferrite. I dont think you need worry about lead lengths at these frequencies.(strays are minimal compared with 80uH and 14nF) BUT the coi
Hi Joe and Laurence, It depends what power you design for, there can be ahell of a lot of current flowing through it .....I remember measuring 12A running100W or so. I had this current fusing the con
Hi Chris, MMmm well is is and it isnt :-)) the classic Wikinson I know has two quarter wave sections of (I think) 1.5*Zo transmission line with a 2*Zo resistor across. Of course a quarter wave of coa
Hi Ken not on this group?? you are referring to the Yahoo group I presume? It sounds as though you have set up your account to send daily digests. Log into the web site (address clickable at the very
Ah Ken, you indicated it was a Groups problem, what you now describe sounds more like your mail-client. The blacksheep group does not have a digest option !! I can only think that it is Outlook causi
Colin the wavy line you display as your QRM is almost certainly a switched -mode power supply. the line at 1400 is a harmonic of the switching frequency and this is modulated by 100Hz giving the side
Hi Marco I dont know where you are putting the caps but I am assuming they are passing a high RF corrent. I found that the old style (valve) high voltage caps in my Class E test rig changed capacitan
Hi Marco, I may well be wrong I was experimenting with 150W at 35V I measured 12 to 15A through the capacitors (from memory) .......the confirmation is that the change is permanent. I dont remember s
Following on to Andy's Sherlock......do you monitor the driver supply voltage during the tests?? I am proposing a case lack of RF immunity in this driver PSU......"elementry dear Holmes" Alan G3NYK H
Hi Marco I'm glad you found the problem despite my "diversionary" posting if the possibilities are "impossible". Be careful jumping to 180V ! I guess you need and old fashioned linear supply and a va
Hi Terry Send a message addressed to [email protected] put something in the subject though it is ignored. NB use text NOT HTML or RichText for the body of the message. Then on the first line i
iHi Paul and Joe. Interesting results on VLF . The following may be interesting? I dont know how badly electron precipitation affects VLF though it aligns with the poor results on the 16/17th. The pr
Hi Chris, I think you know me and my approach by now :-)).....suggesting you asked the wrong question ! Insulating the mast is possible I am sure as Mark a professional BC engineer says.......... But
Chris my interpretation of this is in terms of the waveforms on transmission line. You could think of the current and voltage referring to the real part of the complex load impedance (ie the "R" bit)
Hi Riccardo, I will forward attachments but there is a size restriction (I can't no remember what it is but probably about 3 to 500kB) This one is an old text distributors, from the days of dial-up I
Hi Stefan yes I think you are right the attachment size in included in the message size. I thought that was Riccardo's problem. If the attachment is being stripped off, but the email passed, then I t
As a few of you may know Dave Powis G4HUP a long time provider of interesting kits marketed a calibrated antenna current meter using a clip on ferrite sensor. Sadly Dave died suddenly in April and it
It has just occured to me that the 1A range may not be high enough for some of the LF QRO merchants. There is a simple mod which will extend the range up to 10A though you should be aware the ferrite
