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A tool for monitoring popular webcluster service from OH9WOH2AQ Radio Club. FAQ Index Specifications are subject to change without notice Elecraft K3 Transceiver. K3 Rear IO Details. The receiver signal flow is as follows. Incoming RF passes through the TX low pass filters, the T R switch and to a. Next is a switchable by relay 1. B attenuator followed by a switchable by. RF preamp. A unique switching mixer design then accepts the RF signal along with the. DDS steered, PLL based synthesizer. The synthesizer design took. The mixer post amp is a high standing current design which feeds the noise. IF output buffer amp. The K3 uses an IF of 8. MHz. There is no up conversion involved. At 8. 2. 15. MHz we can create high performance roofing filters for outstanding selectivity. DSP gets involved. In fact, the filters are so good that we can go from there directly to the. DSP IF of 1. 5 k. Hz without any intervening 4. MSUARC_DX_pres/screenshot1.jpg' alt='Ham Radio Rig Control Programs' title='Ham Radio Rig Control Programs' />RIGblaster Links to Ham Radio Sound Card Software. This collection of software programs is included on the DVD of Sound Card Software Collection. Software. Here are a few software utilities, data files and informational bits which are freely available to other amateur radio operators KX3 Sample File for the. Understanding Antennas For The NonTechnical Ham A Book By Jim Abercrombie, N4JA SK Illustrations by Frank Wamsley, K4EFW. Edited by Judy Haynes, KC4NOR. Hz IF section. This improves. The crystal filter up to. FET IF amplifier which is also AGC. Next is a second mixer with injection derived from the synthesizer reference. The output from the mixer is differentially amplified at the 1. Hz. IF and fed to the DSP. There is also a peak detector circuit here which activates at high signal. At this point, the DSP takes over, accepting the differential 1. Hz IF. signal and performing conversion to audio, IF and AF filtering, and myriad other. On transmit, the reverse path is taken. Again, there is no intermediate 4. Hz IF stage required. The 1. 5 k. Hz IF signal is directly converted to 8. MHz. and then to the desired operating frequency. A FET based 1. 0 watt PA capable of 2. QRP version, and as the driver for the 1. W PA in the. The K3 exceeds the K2 in every respect, and most. For the ARRL. and Sherwood Test Results see http www. K2perf. htm. Would the K3 be any less susceptible. Hz hum influences from large sources and ESD failures when an antenna is. K2 The K3 includes ESDlightning. While no protection can guarantee. K3. The K3 outperforms the K2 in terms of. Hz hum susceptibility. Can the K3 be muted  If so, is it. PTT switch closure puts it into MUTE mode. You can also. do this with a PC command. At present theres no dedicated MUTE only input, but. Like other roofing filters, the narrower the passband, the more loss. In general the loss is similar to those shown for the FT 1. MHz filters. shown on the INRAD web site. Our 5 pole filters in some cases have a little less. The loss at this point in the radio the first IF has very little. MDS or other characteristics, because the noise figure is established. When you install any roofing filter, you use the menu to tell the firmware what. MHz, and what the. The DSP adjusts the 1. Hz IF gain based on the. IF gain. Once a filter is installed, you can specify which modes it is available in. Theyre calculated instantly, on demand, so essentially theyre unlimited. If. you wanted to put a number on it, Id say 5. But you never have to. WIDTH, SHIFT, HI CUT or LO CUT. What. Filters should I buy and what is their responseSee What. I buy Filter Notes from Wayne and Eric. All. 8 pole and 5 pole filter plots. Are they mode dependent in their selection, or are they selectable. DSP settings are stored per mode and per preset. Crystal filters are selected. DSP settings, or manually by tapping. XFIL. Are they adjustable by a single control or are they set using a fixed. We use two knobs that have two functions each. You can treat the knobs as. SHIFT and WIDTH, or LO CUT and HI CUT, easily toggling between the two. The LCDs DSP filter graphic, centered directly between the. What is the frequency variance per filter We could set this up as the operator prefers, but at present were using 5. Hz per step, which provides quite adequate resolution. At 1. 0 Hz it can take too. When RIT is ON, it is applied to the VFO A display. You can also see the. Simon And Garfunkel 20 Greatest Hits Mp3. RIT control 9. VFO B. You can check the amount of offset without adjusting the control by. DISP button and scrolling to the RIT offset 0. The CLR. button will clear any offset to zero without turning RIT off. If you have. RIT off and then on again the offset will remain. CLR. If you have RIT or XIT ON, and the offset control is not set at dead center. LEDs will tell you whether you have a negative or positive. When RIT and XIT are both off, the offset control advances VFO A. Hz for. SSB, 591. Hz for AM, etc. The noise blanker has been totally redesigned and is being tested on a wide. We studied several different design approaches. KNB3, including the Drake circuit. It is also supplemented by DSP noise blanking, which. IF blanking. The two in. DSP random noise reduction really shine. NR depends on correlation of the. The system does not actually provide. Noise Reduction it provides Signal Selection. In other words, its default. It has to believe there is a signal present, and. Random noise has no correlation, voice has moderate but not perfect unless. CW has excellent correlation. As a. AF level will produce about the same audio level. SN speech signal and CW is hardly suppressed at all hence. NR is not recommended in Data Mode. Data is already getting a matched. You might lose a few symbols as the NR settles. NR in the end is intended for modes you listen to. Yes. The DSP works in conjunction with hardware AGC to smoothly handle. In addition the K3s hardware noise blanker would remove such. It has a variable threshold, so you could leave. Does the AGC toggle between two, or more settings Fast or Slow indicated by AGC F or AGC S icons. Are the settings variable in terms of attack, hang, and decayIn the menu, you can set the following. AGC  Pulse noise pulse rejection,  Hold Hang. Decay in d. Bsec. Fast and Slow, Threshold, and Slope. Slope sets the compression you get. AGC, whether you like everything above the threshold to be flat S4 and. S9 are the same level or some sort of slope 2 1, 1. Will they be mode sensitive Not. Slow and Fast covers most. Settings are saved per operating mode. MHz, with a reduced sensitivity region near our 8. MHz IF. With a first IF of around 8 MHz, how. Will there not at least be hole in. IF frequency General does not mean continuous in this. There is a small gap at 8. MHz. You may be able to tune to this. There is a trap circuit to. Hz of 8. 2. 15 MHz. Will the K3 be able to tune WWV without the general coverage filter. Yes. The K3 performs very well as a SW broadcast RX. The DSP IF and AF have very. RX EQ.   We. have plans to add synchronous AM detection as a future DSP firmware upgrade. There are dual VFOs A and B, controlled by separate VFO knobs. You can. operate SPLIT, as usual, whether theres a subreceiver or not. The. K3s VFOs can be set to different modes and even different bands. Each VFO. I and II, on a per mode basis. A. preset in K3 land is a combination of a crystal filter selected. DSP controls and the DSP settings SHIFTWIDTH or. HI CUTLO CUT, which can be used interchangeably. Having two presets. VFO allows you to set up the two XFILDSP combinations you use most. III button. There. VFOs frequency andor mode andor band. To enable linking HOLD the SUB. A second HOLD enters Diversity mode if. With link and diversity modes the VFO A. VFOs.   If you allow VFO B to be completely. A, you can set it to a different band, perhaps to monitor a. VFO A for normal ham band RXTX. To enable. VFO IND in the CONFIG menu. VFO B has its own frequency display, LOCK icon, and if the sub is.