[Elecraft] K3 Beta Firmware
I agree that downloading a beta version can a little confusing for people like me who do it very infrequently. Sometimes the littlest thing can be frustrating. For example, the following instruction from the K3 website: 9. Click download all new firmware. could cause confusion for some users because their K3 Utility program does not have this button but instead has a button labeled Send All Firmware to K3. I also agree with others that K3 users should not be afraid of installing new beta versions. Some users may want to wait a few days before installing a new beta because if any serious problem exists in the new version it will soon be identified by some expert user and then quickly fixed by the Elecraft team. To date, I have only installed two beta versions but in the future I plan to install all new beta versions few days after they are announced. Doug N0HH __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] [K3] Questions about ARRL review
Table 2 of the ARRL review finally answered my questions about the relative performance of the 2700 and 2800 Hz filters at 1 Hz and 2 Hz spacing. The results are very impressive. Can someone explain to me why the above/below results for these two filters are so disparate at these narrow spacings? The review suggests that the observed asymmetry is quite unusual. Is the performance of a radio most accurately described by the larger or the smaller of the above/below values? Is the asymmetry due to a design problem in the roofing filters or something in the K3 circuitry? If the asymmetry could be corrected by a change in roofing filter design, would the above/below values both become similar to the average of the two values? For instance, would the 94/81 IMD values at 1 kH spacing for a redesigned 2800 Hz filter approach 87.5/87.5, which would be a truly spectacular result for a radio with a single 2800 Hz roofing filter. Doug N0HH (K3/10 #1213) ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] QRRR
What ever happened to PAN and MAYDAY? They are still in use by commercial operators. See table below. Message TypeTelephony Telegraphy DistressMAYDAY MAYDAY MAYDAY SOS SOS SOS Urgency PAN PAN PAN PAN PAN PANXXX XXX XXX Safety SECURITY SECURITY SECURITY TTT TTT TTT Doug, N0HH ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] [K3] NR comment and roofing filter questions
I am still learning about all the features in my K3/10 (#1213, ordered 2/19/08, received 7/11/08). It has the 2.7 kHz filter and no options. I agree with others that the K3 NR can be improved. I resorted to using an outboard DPS filter, the ADSP2 from SGC. The ADSP2 works great on CW but I dont like how it distorts voice. The ADSP2 must use a very different algorithm than the K3 NR because NR takes out noise the ADSP2 leaves behind and the ADSP2 takes out noise that NR leaves behind and this seems to hold for all bands and all band conditions. Im still playing with different setting to get NR to sound good with voice but so far the NR in my Omni VI seems to work a little better with voice because the Omni NR does not distort voice as much. I do not have a Clear Speech now, but when I did have one I liked the way it worked with voice by reducing the noise and not distorting the voice. The Clear Speech was not good for CW as I recall. Maybe Elecraft will figure out how to modify NR to make it work more like the NR + ADPS2 combination when in CW mode and more like the Clear Speech when in SSB mode. Given the inability of NR to reduce noise in CW as much as I would like, I wonder if a narrower roofing filter might knock out a certain type of noise that NR cant eliminate. I dont need a narrower roofing filter to handle very strong and very close signals, but I wonder if the narrower roofing filter cuts out some noise that the NR leaves behind (similar questions have asked on this reflector but I cant find a satisfactory answer). Could someone at Elecraft please perform a very simple experiment for me? Have two K3s running side by side. Put only a 2.7 kHz filter in one and put 2.7 and 1.0 kHz filters in the other. In CW mode, set BW to about 600 Hz and engage NR. Set the volume the same in both rigs and tune both rigs to the same unoccupied frequency of a noisy band. Does the K3 with the 1.0 kHz filter sound less noisy and less fatiguing? I have a second question out of pure curiosity. Can someone at Elecraft give me a rough estimate of the 2 kHz IMD with only a 2.7 kHz filter? I would be happy to hear Erics best guess subjective/conservative estimate. I realize this value was reported in a recent RadCom article but the results reported in that article are so unbelievable that I suspect there was serious problem with the testing procedure. N0HH ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] RSGB RadCom K3 review posted on RSGB Members web page
The numbers reported below are close to what I would expect if the 2.7 kHz and 500 Hz column labels were accidentally switched. Typo maybe? Doug N0HH = Yes something isn´t right. This was his measurements: CLOSE-IN INTERMODULATION ON 7MHz band,500Hz bandwidth, CW preamp off 2.7 kHz roofing 1.8 kHz roofing 500 Hz roofing 2kHz +19dBm 101dB+12.5dBm 96dB+2.5dBm 88dB 3kHz +19dBm 101dB+12.5dBm 96dB+2.5dBm 88dB 5kHz +22dBm 103dB+12.5dBm 96dB+8.5dBm 92dB 7kHz +22dBm 103dB+12.5dBm 96dB+13dBm95dB 10kHz +22dBm 103dB+12.5dBm 96dB+17.5dBm 98dB 15kHz +22dBm 103dB+12.5dBm 96dB+22dBm 101dB 20kHz +22dBm 103dB+12.5dBm 96dB+25dBm 103dB 30kHz +22dBm 103dB+12.5dBm 96dB+26.5dBm 104dB 40kHz +22dBm 103dB+12.5dBm 96dB+27dBm 104dB 50kHz +22dBm 103dB+12.5dBm 96dB+27dBm 104dB ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] K3 2KHZ IMD question ...
Has anyone measured the 2 KHZ IMD on a K3 with the stock 2.7 KHz 5 pole filter? If so, could they please let me know? -- Dave G. KK7SS Please also let me know. Doug N0HH ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] 5-pole filters
I ordered a K3/10 kit and it should arrive in June. I am considering an upgrade from the stock 2.7 kHz 5-pole filter to the 2.8 kHz 8-pole filter. Several months ago I read that Elecraft would post the 5-pole filter plots next week. I have seen the filter response tables, which are very helpful, but I would like to study the actual plots before making an upgrade decision. I have not been able to access the OH9BH plots. Would someone please post these plots on the K3 wiki? Would Elecraft be willing to lend one of their inexpensive 2.7 kHz filters to some expert K3 owner who has the 2.8 kHz filter? Or, is there any expert KRX3 beta tester who has the 2.8 kHz filter in the main receiver and the 2.7 kHz filter in the second receiver? I would very much appreciate your subjective comparison of these two filters. Doug N0HH ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
