IC-7851
Test Report for IC-7851 July 1 and September 21-22, 2015 by Adam Farson VA7OJ/AB4OJ (Iss. 2)
The following are the results obtained from lab tests which the author conducted on Icom IC-7851 S/N 02001019, kindly loaned by Allan Buckshon VE7SZ. The installed firmware versions were V1.01 for the receiver tests and V1.11 for the transmitter tests. The baseline configuration for all receiver tests was MAIN Receiver, NR/NB/ATT/Notch off, AGC Slow . A. Receiver Tests (July 1, 2015): 1. MDS (Minimum Discernible Signal). Test setup: Marconi 2018A signal generator, 20 dB pad, DUT ANT1 input.
HP 339A distortion meter at EXT SP jack as level meter. 2. NPR (Noise Power Ratio). Test setup: Wandel & Goltermann RS-50 and RS-25 noise generators (fitted with filters per Table 2), MCL 75/50Ω transformer or matching pad for 1940 kHz only), DUT ANT1 input. DUT set to LSB for all test frequencies except 5340 kHz (USB). 2.4 kHz IF filter selected. Noise loading adjusted for 3 dB increase in audio output at EXT SP jack, as read on HP 339A. NPR derived by calculation. 3. RMDR (Reciprocal Mixing Dynamic Range). Test setup: Marconi 2018A signal generator, 3 dB pad, 9830 kHz bandstop filter, 0-110 dB step attenuator, DUT ANT1 port. HP 339A distortion meter at EXT SP jack as level meter. 4. DR3 (2-Tone 3rd -Order IMD Dynamic Range).
Test setup: Marconi 2018A and 2019 signal generators, MCL ZHL-32A buffer amplifiers, MCL low-pass filters appropriate for band tested, 20 dB pads, MCL ZSC-2-1W combiner, 0-110 dB step attenuator, DUT ANT1 input. Test signal level adjusted for 3 dB increase in audio output at EXT SP jack, as read on HP 339A. 5. Roofing-filter bandwidth: As for 1. 6. Spectrum scope RBW: As for 1. 1. MDS (Minimum Discernible Signal) tested on 14.1 MHz in CW mode (500 Hz), Preamp off, 1 and 2 in turn. Roofing filter 15, 6, 3 and 1.2 kHz in turn. The MAIN receiver is tuned to f0 = 14.1 MHz and a test signal applied. For each preamp/roofing filter combination, the input power Pi required to raise audio output noise level by 3 dB is noted. Pi = MDS. NR/NB/ATT/Notch off, AGC Slow for all tests. Refer to Table 1. A variant of MDS is also measured in SSB mode (2.4 kHz) at each of the four NPR test frequencies in turn, for use in calculating NPR. The measured MDS values and roofing-filter correction values are given in Table 2. Table 1: Minimum Discernible Signal (MDS). 14.1 MHz, 500 Hz CW..
This application allows Amateur Radio Operators to browse and search their Logbook of the World (LOTW) QSL confirmations on their handheld de... Read more
Ham Radio Black Friday Read more
WSJT-X 2.0.0-rc4 – Download “A fourth candidate release (“RC4”) of WSJT-X 2.0 is now available for download and use by beta... Read more
The massive and barely contained Thomas Fire in Southern California has consumed more than 230,500 acres, and the emergency has caused residents in fi... Read more
At a special meeting held via teleconference, the AMSAT Board of Directors elected Clayton Coleman, W5PFG, President. Coleman previously served as a m... Read more
“I typically paper log my Parks on the Air contacts during an activation. After I get home I will transcribe and edit the log with Fast Log Entr... Read more
by Paul Stoetzer On January 27th, Brad Schumacher, W5SAT, reported copying his CW signal weakly via the RadFxSat-2 transponder. On the morning of Janu... Read more
International Marconi Day celebrates the huge part Guglielmo Marconi played in the invention of radio. IMD is a 24 hour amateur radio event that is he... Read more
Dayton Hamvention® is increasing the cost of admission and its booth fees. Hamvention General Chair Jack Gerbs, WB8SCT, announced this week that gener... Read more
Retevis RT97 Portable Mobile Analog Mode Repeater Features: 1, Customizable: The TX and RX frequencies can be customized between UHF (400-470MHZ) 2,... Read more
Frank Howell, K4FMH, followed up his two-part National Contest Journal (NCJ) series, “The Demographics of Contesting,” with a post to his Social Circu... Read more
Sunspots made a solid reappearance over this reporting week (June 4-10) with average daily sunspot number rising from 3.3 to 14. As expected, solar fl... Read more
Are young people involved in Amateur Radio? That’s an existential question because if they’re not, there’s no future in ham radio. But, fortunately, J... Read more
The National Hurricane Center (NHC) has made it official: It’s Hurricane Joaquin, a Category 1 storm. But the NHC said that Joaquin is gaining strengt... Read more
Recent Posts
N1KDO’s LoTW Look – Android
Ham Radio Black Friday
WSJT-X 2.0.0-rc4 now available
Amateur Radio Volunteers Active in Latest Round of California Wildfires
Clayton Coleman, W5PFG, Elected AMSAT President
Paper Logging and Using Fast Log Entry for POTA – Ham Radio Q&A
RadFxSat-2 Signals Detected, AMSAT Engineering Continues to Assess Status
International Marconi Day
Dayton Hamvention Admission, Fees to Increase in 2020
What’s Inside The Retevis RT97 Portable Repeater?!
Traditional Amateur Radio Contesting Faces a Demographic Cliff
The K7RA Solar Update
What Hams Do…The Future of Amateur Radio – Podcast Episode 1
Hurricane Watch Net Activating for Hurricane Joaquin
Warning: file_get_contents(https://plusone.google.com/_/+1/fastbutton?url=https%3A%2F%2Fqrznow.com%2Fcomplete-ic-7851-test-report-now-on-line-by-adam-va7ojab4oj%2F): failed to open stream: HTTP request failed! HTTP/1.0 404 Not Found in /home/qrznow/public_html/wp-content/themes/goodnews5/framework/functions/posts_share.php on line 151
