Hello, Compensating an off-resonance antenna with increased TX power seems like a brute force method to me. Why not build a simple phase measuring thing that outputs a +/- voltage that is proportiona
Hi All, Class C, D, and E amplifiers are not that hard to modulate. Rather than do anything so drastic as tinkering with PWM in the RF driver stages, apply PWM methods to the power supply for the fin
Andy and All The parasitic diode is no good in this configuration for catching the spikes from what I call the transient soak choke, I use separate clamp diodes up to the rails effectively 'crosing o
Hi Decimation to lower the sampling rate is straightforward if wanted, just by taking one sample out of every N. You'll need a decimation filter to keep aliases out if the original signal has spectra
Hi Andy and All The catch diodes clamp over-voltage spikes extremally well, in fact I don't see any spikes at all on the breadboard design. Yes, the "totem-pole" configuration is sort of self-clampin
Hi all My computer warned about possibly dangerous content in the message LF:G4CNN QRSS from William Staples. I had a quick look into the raw message code and it seems to contain the "kak virus". Be
Hi All, Sometimes Radio Norway (1314? 630?) sounded almost as strong as the original modulation! Please forget what I wrote about Radio Norway heard as Luxembourg effect on 153 kHz. I was not aware t
Hi, Also, does anyone know a suitable alternative to those magical 3C85 cores having a diameter of 25; 42; and 58 mm? At 136 kHz, the material 3F3 is better than 3C85 for power transformation (lower
Hi All, At my QTH, the Icelandic BC stations on 189 and 207 kHz have been much stronger than usual during the recent nights. I am using a K9AY antenna for receiving (cardioid pattern) and when I poin
Hi, As you probably already know, all Swedes are born with eleven fingers. Anyway, we are trying hard to approach the metric system, we're approaching it inch by inch... Better be careful, if the len
Swedes also promise to eat their hats under similar circumstances ;-) I will eat my hat if somebody will decode Jack's callsign out of it. Thats a nice saying. On these occasions, in Germany we eat a
Hi The ISO standard is Year, Month, Day, which shouldn't confuse either side, unless one is from Mars perhaps. Yes, this is the logical way to write a date - most significant digit first. I think tha
Mike 'XDV and All Yes, it must have been VE1ZZ. I got even better copy on his 0100Z transmission. Regarding blurred dots: Yes, I am well aware that the BW was (at least theoretically) too narrow for
Hi All, I think I saw VE1ZZ on 135.502. With a little imagination, "1ZZ" can be seen in the attached picture. The transmission ended, or disappeared into QSB, at 00.42 UTC. 73 de Johan SM6LKM TIFF im
Brooks Shera published an excellent article in QST on "disciplining" a frequency standard to the GPS 1 PPS signal. I have built a standard based on this design and it performs very well. Schematic,
[snip...] Better still, an absorber rather than a reflector - instead of bombarding everyone's e-mails with junk, it could all be written to a CD-ROM, which could then be discarded by RSGB staff at r
I remember having read that the Oncore has been discontinued by Motorola. I have been suggested the following GPS OEM unit as a valid (or better) alternative when the primary interest is the 1PPS pu
