composite noise and rx phase noise is incredibly high? Where did you find these IC-7800 data? G3SJX noted the increase of impresive low Orion oscilator noise away from carrier. 73 de Mario, S56A, N1
probably wouldn't be interested. ;-) I built radio above K2/Orion class with 9 MHz IF and +23 dBm diode mixer in 1970s. The only progress since is in DDS, optional DSP and IF above 2 x 30 MHz. 73 de
expense of very poor close-spaced IMD and BDR performance. The unique DSP contribution to HF RX is smart auto-notch and noise reduction, the rest is marketing! IF above 15 MHz removes superhet image
not so simple to find a 500 Hz BW filter for $200 at 45-65 MHz. I mentioned antenna filters available at that price. You wouldn't like to receive just 500 Hz on any band so they are 15 kHz wide but
Kenwood radios (maybe a very few the TS-870S). CN8WW M/M world records were made with a lot of TS-850s. I enjoyed TS-2000 at 3V8BB against TS-570 with a pumping DSP AGC. Let me repeat once again, we
I let filters and selectivity and digital processing do most of the hard work for me. Don't forget to switch AFC ON! Our champ missed a few off-frequency callsigns at Dayton 2002 pile-up :-) 73 de M
which is the topic we were discussing. I am always looking at RX covering whole HF band with close spaced interference problems on rare occasions. The best RX is the one which statistically receives
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
BDR, Phase Noise, etc? Four scaned pages of Radcomm Orion test report can be found at http://artinian.bit.si/slike/orionX.gif where X stands for 1,2,3,4. RSGB takes good care of its members and publ
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
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
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.