"Multipliers are only YU-YT prefixes now." Please beware that AD1C CTY list still attaches 4N to Serbia and 10 wrong prefixes exist in N1MM Logger YUDX.SEC YU8 is an ordinary Serbian prefix wrongly a
Steef, PA3S wrote: It is with great pleasure that this weekend make me realize that the RBN is now way near a humane operator. Let alone a good operator. I noticed bad spot of PA33A and I just checke
N4ZR wrote: to the best of my knowledge there is no such "desensing" phenomenon with CW Skimmer or Skimmer Server. There is well known natural phenomena in discrete digital signal analysis of spectra
HB9CVQ wrote: 2. April 2012, 03:08 / 0319 Z on 14006 and 14056 kHz while I was really on 1821 kHz Cqing with better than 60 dB measured harmonics suppression. Ex-VR2BG/p wrote: That has nothing to do
I wonder if Charly, HS0ZCW ever tried PSK on HF? These are often inaudible signals barely visible on waterfall with perfect error-free print! WSJT EME is even better case. Beware of human limitations
Brett, 3,8426% can hardly be rounded to shy 3,9 %! Wrong band spots are mere 0,5 %. I do mostly S&P and I am often spoted while calling somebody several times. If I move fast, I might be spoted again
CT1BOH wrote: But the majority is "spots" send by skimmers, of stations calling RUN stations. These spots should never be sent out to the network by skimmer. Jose is certified Runner but I am glad he
CT1BOH wrote: In 2012 CW on 40 meters out of the 993.548 spots 90% come from 922 stations out of 8000+ stations that sent logs. I remember Jose being delighted with "democratic" features of RBN spoti
Rick, ZL2HAM wrote: My Skimmer often hears stations only once that aren't heard by any other Skimmers. We got several local CW Skimmers in small S5 but I preffer unfiltered richer RBN spots. Poor sum
Real life 0IF RX could achieve 60 dB unavoidable image rejection and this is not enough in contests. Our ham freqs are NOT channelized although one knows where the image is! Direct HF sampling ADC RX
Jose, CT1BOH analyzed 109 bust spots out of 8114 DR1A spots, mere 1,34 % ! This is much better than humans 3 % average. QSD I/Q images and harmonic relations are well known phenomena. BPF help even s
VE9AA wrote: I was on 14.048 it would report me on 14.114 or something crazy like that. Mike, nothing crazy about that - QSD SDR is using 14081 kHz "BFO" and probably lost one stereo channel to PC so
Beware of some poor Morse copying so I used on ocassions Z666666/S5666666A at 20 wpm to pass my callsign. Someone honestly spoted me as ZB/S56A on 40 m on Sunday evening and dupes pileup followed. Re
VE9AA wrote: Normally you would only spot a station after you would work them, right? Not right! Hams are given freqs for propagation research and tech edu. I might find band openings not yet reporte
"Matt, KA1R, developed an SSB version of the CW Skimmer. With a CQWW score of over 1M points, and an innovation score of 81, his Xtreme score of 181 was the highest of all Xtreme entries." Five years
Salvo wrote: By myself my call was spotted as W1AYD several times in between IW1AYD. There are several ways this error occur: Fast fading and leading I was lost. Smart filtering which extracts more f
http://www.ab4oj.com/test/main.html#NPR gives unbiased account of the behaviour of 16-bit ADC under strong signals! There is only one input to ADC IC and even a single strong signal close to overflow
test signal is not a constant, but is adjusted to depend on characteristics of the radio being tested. HF is noisy and overcrowded by powerful broadcasting signals and over_the_horizon radars. Semic
Mark, I thought for a long time that a carrier as a steady signal but in the case of ADC it overflows only at the short peaks and it can often be tolerated! Weak signal can be detected by human opera
N9AA wrote: Unbiased? Have you taken a look at his Icom fanboy pages? Scott, I checked AB4OJ NPR pages again and now I notice deep bias against Kenwood as none of their radios was tested! I am sure t