Now available for ARRL members only at: http://www2.arrl.org/members-only/prodrev/pdf/lab/ic7800.pdf KC1SX added some new 1 kHz data to the QST Product Review: BDR: 95 dB (graph on page 19) IMD: 66 d
"So much for "astonishing, unparalleled, ultimate" and other unabashed Icom marketing hype about the 7800." This information may have previously been presented here by others, but W8JI's testing of t
I know many of us bemoan the fact that QST, in their general readership journal, does not really "get to the point" in explaining rig comparisons to the lay amateur (vs. "professional" amateur, of co
While I don't bemoan the QST staff writers failure to get to the point, I hate it when a died in the wool "ain't nothing like my brand" rig owner is given the latest from "his brand" to test. Testing
Icom marketing hype about the 7800. Apart from +37 dBm IP3, I was amazed by IC-7800 nonexistent IMD3 AF products even with fast AGC. This alleviates the needs for expensive sharp front end filters.
P.S. Compare IC-7800 and Orion TX output spectra. Orion RX is the same on HF IF and image frequencies. Which radio would you prefer in multiband environment? 73 de Mario, S56A, N1YU _________________
Good idea Clark ! I sugguested this a few years ago and got a cold response from the list . John kb2huk -- Original Message -- From: "Clark Savage Turner" <csturner@kcbx.net> To: <tentec@contesting.c
"Which radio would you prefer in multiband environment?" One that can hear next to strong adjacent signals... _______________________________________________ TenTec mailing list TenTec@contesting.com
Speaking of which, anyone have an idea as to why the '7800 transmit composite noise and rx phase noise is incredibly high? -Paul, W9AC _______________________________________________ TenTec mailing
Speaking of which, anyone have an idea as to why the '7800 transmit composite noise and rx phase noise is incredibly high? Since this rig is "Astonishing" and has "Phenominal performance" it is unnec
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
Speaking of cost, for >12 dB less $$$$$, you can buy an Elecraft K2, get identical IMD and ~20 dB better BDR at 1 kHz spacings. But the K2 is not the "astonishing unparalleled ultimate" so you probab
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
Hi Mario, Some would argue there has been little true progress in the areas you mentioned. With DDS we got generally worse phase noise performance than we had using crystal oscillators. With DSP we g
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
Mario, I would add to the list of DSP's benefits "finally enough filters". In the past, no rig had enough slots to put all the crystal filters I wanted. Now with DSP, the rigs have enough filters. 73
We were forced to use our brains before DSP. This is not very popular these digital days :-) 73 de Mario, S56A, N1YU _______________________________________________ TenTec mailing list TenTec@contes
Hi Mario, trade-offs with narrow front-end crystal filters. I am surprised that purists are not buying more 200 $ crystal filters at the antenna input!? Unfortunately, as Icom, Yaesu and Inrad have a
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
Hi Mario, S56A: wide but very up-front! That wouldn't do a thing for a strong signal within the 15 kHz passband. You would still have exactly the same close-spaced IMD and BDR issues, which is the to