Hello Mal, Thanks for your tips to prevent the loadingcoil from overheating, this will be usefull for those who can get 10A or more into the antenna. Just one remark : Dont waste all those hundreds o
The reflector seems to be working again, so here comes a short weekend report : - M0BMU was seen with a good 'O' signal on 70.65kHz, beaconing with call and locator. Signal was audible but too weak f
If a significant part of the nighttime QRN/QRM is realy coming from the east then a directional receiving antenna should be considered. Two small loops spaced 1/8 wavelength (275m) and fed with 90 de
Last night the was a carrier on 137.040 (+/-) was S4 at 19.30 UT and went up and down between S2 and S8. It was still on at 23 UT when I went to bed. It seemed an unmodulated carrier to me. Maybe Ala
I was really amused at the 'China Syndrome' thought. That hadn't occurred to me (it's rock here), but it is a valid point, hi! It sure is, the first time I 'watered' a rod in the soil I didn't secure
I found an easy way to drive in earth rods made from copper water pipe is like this: I found a steel rod of a slightly bigger diameter than the pipe, put a point on the end, and hammered it in to the
I have just looked around and I can not find the file I referenced, please send me a description of DFCW, I am of the impression, apparently wrong, that DFCW involved dual frequencies, which I have i
I studied DFCW and the linear requirement is not possible of course. Larry, to avoid misunderstandings : DFCW does not need linear amplification. 73, Rik ON7YD
Laurie, you're right about the 8-shaped pattern, in fact the pattern is very similar to that of a lambda/2 dipole (in free space). A Marconi antenna has more directivity than a loop (4.8dBi versus 1.
If we want to develope a new 'code' for a time effecient mHz bandwidth modulation first thing we should do is to make a list of requirements. My list would be : - suitable with non-linear amplifiers
Hi Laurie, The other thing is what about a Loop Rx ant.? that should give a few dbs improvement in S/N due to directivity. A loop can be very efficient to null out one source of QRM/QRN, due to the v
Alberto, besides the need for a linear PA each of the tones would also have only 50% of the power. Wouldn't that 'give away' 3dB SNR ? 73, Rik ON7YD Just out of curiosity : I was thinking, a few week
Hi Larry, I had a look for you this morning and saw a interrupted trace popping up just over the noisefloor. QRN was bad, but I could make a VA out of it (with some imagination). I'm pretty sure to h
Larry, sorry if I caused any misunderstandings, I wasn't aware that the beacon is at a remote site. I will try to copy your signal in the morning and let you know if I have any succes. Thanks for tak
Hi Larry, I'd like to give it another try to copy your beacon over the weekend as best chances seems to be just after sunrise (in Europe). Is your beacon still non stop in the air ? I believe you are
hi Mike, what antenna are you using for receiving ? I'm using my transmitting antenna and found that I can add up to 40dB attenuation between antenna and RX (Kenwood TS440) before the bandnoise hits
I measured the frequency difference as 1.75Hz at 20.30UT (using Spectogram). I can not measure absolute strengths but the higher frequency was 2dB stronger here. Both signals were well above noise, w
At 10:49 24/01/01 -0500, DK8KW wrote: ... I don't really understand why and how my own setup works ... a large loading coil (3.8 mH) about 1/3 height up the mast .... in wind and rain and snow, witho
I have a bit of a problem with some recent mails. I agree that CW activity has decreased over the last months but I do not thing that QRSS is to blame for it. Apart from one case of unintentional QRM
Hi Peter, I did a little test on saturday afternoon : I did put the lower part of the loading coil (that is normally in horizontal position) vertical (directly under the wire). I did measure the ante
