modeling; Considering antennas, I'd prefer YT1NT BSc EE knowledge over hyperactive wordsmith W4RNL PhD Philosophy. There was an excellent body of antennas knowledge in YU culminating in late Branko
anywhere but they tested IP3 on 7 MHz with a multitude of spacing.. I finally managed to read Radcomm G3SJX test of Jupiter. He likes software download features. IP3 is +10 dBm on 21 MHz at 50 kHz,
They should read S9+60dB for so many milivolts :-) 73 de Mario, S56A, N1YU _______________________________________________ TenTec mailing list TenTec@contesting.com http://lists.contesting.com/mailm
Todays HF RX technology does bandwidth limited IF DSP at only 36 kHz or baseband processing at 0-3 kHz. There are more cycles available at IF carrier and better detection results can be achieved. TS-
narrow bandwith or noise reduction ? to prevent A/D overload ? John Recommended reading is http://www.doug-smith.net/digitalagc.htm I always keep AGC on slow as I hate noise keying. 73 de Mario, S56
If TT Worshipers Cult forum accepts that slow AGC might be used on CW, they may even consider life without QSK and CW PTT need :-) On the more serious note, DSP RX needs a very tight AGC loop in ord
It certainly is if you are going back to Collins engineers, the last ones in USA with some HF knowledge from 1980's. Contribution of DSP and DDS would be mainly in marketing fields :-) 73 de Mario,
things into some perspective. One needs Software Defined Randomness for similar performance! I know what my IC-735 does when keyed from circuit diags. Cult Ayatollahs are not very happy these days :
Analog AGC (it should actually be AGR_eduction) has a fixed parameters and its main function is to prevent DSP A/D input overflow. As long as this is under control, digital AGC can do all the math w
was then inserted into 1 kHz slot 3rd order IMD products for two 700 Hz signals are both outside 1 kHz BW and greatly influenced by skirt attenuation! Q24 might be a bigger problem then Q9 in Orion.
noise levels, well after sunset on this rather remote area of the Garden Island of Kauai.I vividly remember low noise levels during my short Maui island operation as KH7/N1YU in 1996.I experienced e
information published for the Icom radio. Leif, SM5BSZ has confirmed IC7800 +40dBm IP3 claim on Apr 27th measurements! http://antennspecialisten.se/~sm5bsz/dynrange/ssa2004/ssa2004.htm Also excellen
from Rohde and Schwartz?? AGC RF antenna attenuation was used by Collins radios in 80's. 30 dB S/N was considered enough before data days... 73 de Mario, S56A, N1YU _________________________________
key clicks and phase noise I hear. You would be surprised seeing what you are sending! Made in USA, measured at Balkans. But W4PA promised new upgrade... 73 de Mario, S56A, N1YU P.S. Bill, SM5BSZ is
Some minor problems are probably caused by global warming :-) They are better visible from distance without much patriotic fervor! 73 de Mario, S56A, N1YU ___________________________________________
The proper tool for QRN fighting is N_oise B_lanker. AGC should not repond to short pulses at all. Unless it protects DSP A/D from overflow. W8JI RX IMD measurements with 10 kHz spacing seems to be U
OC Pirotjanac, YT1NT didn't read Collins book on HF SSB carefully enough :-) QRN is random short but very strong pulse. If it is allowed to go thru comlete RX chain to AF, it would be streched a lot
Just a biger spark! Lightning energy spectra goes to 100 kHz which implies basic 10 usec pulse slightly streched by 15 kHz first IF filter. Repetitive nature interference is more annoying for human
The above implies much shorter lightning pulse lenght even more suitable for NB circuits! My memory is 1945 version :-) 73 de Mario, S56A, N1YU _______________________________________________ TenTec
and ANI codes. This process requires considerable time, technical talent, may introduce errors SDR greatly expands the field for error introduction :-) This is often called legacy curse in computers