ВСЕ НОВОСТИ НА www.rv3apm.com/rxdx.html www.rv3apm.com/rv3apmrus.html Product Review and Short Takes from QST Magazine January 2009 Product Reviews: Elecraft K3/100 HF and 6 Meter Transceiver Short Takes: bhi Radio Mate Keypad for Yaesu FT-817, 857 and 897 Transceivers Copyright © 2008 by the American Radio Relay League Inc. All rights reserved.
Key Measurements Summary product review Elecraft K3/100 HF and 6 Meter Transceiver 142† 142† 140 20 70 20 kHz Blocking Gain Compression (dB) 139 2 140 70 2 kHz Blocking Gain Compression (dB) 108 I3 106 110 20 50 20 kHz 3rd-Order Dynamic Range (dB) I3 Reviewed by Joel R. Hallas, W1ZR Technical Editor, QST The Elecraft K3 is a modular and expandable transceiver that can be set up to fill a number of roles.
a size about the same as the compact entry level radios from other manufacturers, this radio includes many features found in the largest and most expensive radios on today’s market. Its performance is comparable or superior in most respects as well. On the other hand, there just aren’t as many knobs and switches on the front of this radio as its larger brethren. Elecraft uses each button for at least two functions. The one shown on the button happens with a quick tap.
QS0901-prodrev01 Receiver FM adjacent channel rejection: Not specified. Receiver Dynamic Testing 20 kHz offset, preamp on: 29 MHz, 79 dB; 52 MHz, 79 dB. FM two-tone, third-order IMD dynamic range: Not specified. 20 kHz offset, preamp on: 29 MHz, 86 dB†; 52 MHz, 86 dB.† 10 MHz spacing: 52 MHz, 104 dB. S-meter sensitivity: S9 = 50µV, user-adjustable. 14.2 MHz: preamp off, 50 µV; preamp on, 13.5 µV. Squelch sensitivity: Not specified. At threshold, FM, 29 MHz, 0.2 µV; 52 MHz, 0.3 µV.
A Close Look at K3 Roofing Filters There has been considerable discussion on e-mail groups about which of the roofing filters to use to fill the five available slots in the K3. These roofing filters are key to the radio’s superb dynamic performance, and you get to choose which ones you want. The available filters are either five-pole (at $100 each), made by Elecraft, or eight-pole (at $126), made for Elecraft by International Radio (Inrad). The bandwidths available are: Five-pole: 200, 500, 2700 Hz.
Figure 4 — The rear panel of the K3/100 includes two antenna connectors, provisions for a transverter, separate receive antenna or preamp, and various accessory connections. mode from 0.1, 0.5, 1 kHz through 5, 9 and 10 kHz. The faster settings apply to AM and FM modes with 9 kHz intended for European AM broadcasts on 9 kHz spaced channels. Another menu item sets the steps per rotation to 100, 200 or 400.
The Elecraft K3 as a Contest Radio How does the Elecraft K3 perform as a contest radio? To find out, I used a K3 in two major contests in 2008: CQ Worldwide WPX CW at the end of May and the IARU HF World Championships in July. In WPX, I used the K3 as the primary run radio in my SO2R (single operator, two radio) contest station. In IARU, I used the K3 mostly for searching and pouncing (S&P) for contacts on other bands while CQing with another radio on the main band.
diversity reception, it’s best to use filters with identical width and specs in each receiver to avoid phasing problems. To test diversity reception, I used a Y cable to connect my 580 foot northeast Beverage low noise receive antenna to the K3’s RX ANT jack and the subreceiver’s AUX RF jack so I could use the Beverage as either a receive-only antenna or a diversity antenna. I also modified my antenna switching system so I could feed a number of different transmit antennas to the subreceiver.
short takes bhi Radio Mate Keypad for Yaesu FT-817, 857 and 897 Transceivers Joe Carcia, NJ1Q W1AW Station Manager jcarcia@arrl.org The bhi Radio Mate is a 16-button external keypad designed to enhance the operating convenience of Yaesu FT-817, FT-857 and FT-897 transceivers. It allows the user to select memories (two banks consisting of 10 memories apiece), toggle different modes (most supported by the radio, such as CW, SSB, FM or AM) and accomplish direct frequency entry.
