[Elecraft] K3 and YAMAHA CM-500
If CM-500 is connected to rear panel mic jack it works fine, however if it is connected to front panel mic jack via conversion connector I have a very low mic lebel with max mic level setting. If CM-500 is connected to KX3 it works fine. CM-500 mic plug to 8p plug connection in conversion connector is like this. tip to pin-1 ring to pin 6 (K3 provides 8V regardless Bias ON/OFF) sleeve to pin 7 I have another electret condenser hand mic. If this mic is connected to K3 front panel mic jack it works fine. If CM-500 is connected to K2 (where 5V is provided to pin 6 of mic jack) using same conversion connector it works fine. Any suggestions please. -- 73 de aki ja1nlx __ 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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] K3 and YAMAHA CM-500
Connect a 5.6K Ohm resistor between pin 6 and the ring of the CM-500 and a 1 uF capacitor between the tip of the CM-500 and pin 1 or simply *disconnect* pin 6 and use bias for the K3 front mic jack. Tip and ring are connected together in the CM-500. There is a 10 uF capacitor from pin 6 to ground (in the DSP power supply). That effectively shunts *any* audio to ground G. You must use the 5K6 Ohm resistor to prevent this loss of mic audio. 73, ... Joe, W4TV On 2014-08-31 3:45 AM, ayoshida wrote: If CM-500 is connected to rear panel mic jack it works fine, however if it is connected to front panel mic jack via conversion connector I have a very low mic lebel with max mic level setting. If CM-500 is connected to KX3 it works fine. CM-500 mic plug to 8p plug connection in conversion connector is like this. tip to pin-1 ring to pin 6 (K3 provides 8V regardless Bias ON/OFF) sleeve to pin 7 I have another electret condenser hand mic. If this mic is connected to K3 front panel mic jack it works fine. If CM-500 is connected to K2 (where 5V is provided to pin 6 of mic jack) using same conversion connector it works fine. Any suggestions please. __ 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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] K3 and YAMAHA CM-500
Joe Thanks for suggestions. I will try that. 73 de aki ja1nlx (2014/08/31 22:38), Joe Subich, W4TV wrote: Connect a 5.6K Ohm resistor between pin 6 and the ring of the CM-500 and a 1 uF capacitor between the tip of the CM-500 and pin 1 or simply *disconnect* pin 6 and use bias for the K3 front mic jack. Tip and ring are connected together in the CM-500. There is a 10 uF capacitor from pin 6 to ground (in the DSP power supply). That effectively shunts *any* audio to ground G. You must use the 5K6 Ohm resistor to prevent this loss of mic audio. 73, ... Joe, W4TV On 2014-08-31 3:45 AM, ayoshida wrote: If CM-500 is connected to rear panel mic jack it works fine, however if it is connected to front panel mic jack via conversion connector I have a very low mic lebel with max mic level setting. If CM-500 is connected to KX3 it works fine. CM-500 mic plug to 8p plug connection in conversion connector is like this. tip to pin-1 ring to pin 6 (K3 provides 8V regardless Bias ON/OFF) sleeve to pin 7 I have another electret condenser hand mic. If this mic is connected to K3 front panel mic jack it works fine. If CM-500 is connected to K2 (where 5V is provided to pin 6 of mic jack) using same conversion connector it works fine. Any suggestions please. __ 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 Message delivered to ayosh...@my.email.ne.jp __ 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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] EME Radio - 144mhz Transverter or 2m Module
Hi Rich, don't know the external one (XV144) myself so cannot comment. The internal one (K144XV) has one drawback: no adequate cooling! Cooling is done only passively using the left side of the enclosure. As JT65 on EME is a key-down mode you will see that power drops soon and dramatically, i.e. starting with 10 watts it will drop down to 5-6 watts after 2-3 overs already due to missing heat dissipation. So you will want to do some external cooling to lessen that effect (but you will not completely get rid of it from my experience). Besides this the K144XV is very sensitive, whenever I use mine I switch off the external pre-amp which is needed for all other transceivers overhere. :-) And don't forget to order the K144RFLK to keep the frequency stable. What you should also consider is which amplifier you want to use. So the XV144 might be the better solution if you need more drive power. If you want to think outside the box you can also check other manufacturers. For serious contesting and EME I'm using the HA1YA transverter ME2HT-PRO with +30 dBm mixer (http://www.ha1ya.hu/htmkepek/me2t_protransverterspec.htm) and 60 watts (including adequate cooling) to drive a GS35 amp. HTH - hope that helps! 73, Olli - DH8BQA Contest, DX radio projects: http://www.dh8bqa.de Am 30.08.2014 14:26, schrieb Richard Thorne: I'm starting to get the bug to try something different and EME has grabbed my attention. I already have a couple K3's and would like to put one to use for EME. Which is the better option the external 144mhz transverter or the internal 2m option? Thanks Rich - N5ZC __ 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 Message delivered to dro...@necg.de __ 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 Message delivered to arch...@mail-archive.com
[Elecraft] OT: Mechanical Dot Stabilizers for Bug Keys
The mechanical stabilizers I've been making for bugs have been extremely well received and I thank my customers for their kind words reviews. The orders have finally slowed down a bit and since finally obtaining a decent bench-top mill/drill I've been able to get a few ahead and now have some of the Vibroplex round pendulum versions in stock for immediate shipment. I also have prepared blanks in stock for the McElroy and Metric round pendulum types that use a larger diameter rod so all that's necessary is for the proper sized hole to be drilled and chamfered to send these as well. The flat pendulum types still have to be made as ordered because I'm still waiting on the right sized cutting bit (back ordered) to allow me to cut the slot on the mill. Right now I have to rough it out on the jigsaw and file to size. Thanks again to all those that have ordered and are now using them. Any inquiries should be direct email to me rather than on the reflector to keep the off topic clutter to a minimum. Jim Sheldon - W0EB __ 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 Message delivered to arch...@mail-archive.com
[Elecraft] K3 Noise reduction question
When holding in the NR button to adjust noise reduction, I get F1-1,2,3,4 then F2-1,2,3,4 etc for F3 and F4. Going further this is repeated for NRmF5, F6, F7 and F8. Can someone direct me to where in the K3 manual it explains what these settings mean and/or when to use NR or NRm? Thanks. Gene, W2BXR __ 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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] K3 Noise reduction question
You'll find it on page 25. Bob NW8L On Sun, 31 Aug 2014, Gene wrote: Date: Sun, 31 Aug 2014 16:57:11 -0400 From: Gene ea...@roadrunner.com To: elecraft@mailman.qth.net Subject: [Elecraft] K3 Noise reduction question When holding in the NR button to adjust noise reduction, I get F1-1,2,3,4 then F2-1,2,3,4 etc for F3 and F4. Going further this is repeated for NRmF5, F6, F7 and F8. Can someone direct me to where in the K3 manual it explains what these settings mean and/or when to use NR or NRm? Thanks. Gene, W2BXR __ 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 Message delivered to n...@sdf.org n...@sdf.org SDF Public Access UNIX System - http://sdf.org __ 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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] K3 Noise reduction question
On 8/31/2014 3:57 PM, Gene wrote: When holding in the NR button to adjust noise reduction, I get F1-1,2,3,4 then F2-1,2,3,4 etc for F3 and F4. Going further this is repeated for NRmF5, F6, F7 and F8. Can someone direct me to where in the K3 manual it explains what these settings mean and/or when to use NR or NRm? Thanks. Gene, W2BXR K3 Owners Man D10.pdf pg 6 pg 15 pg 25 quote Noise Reduction Noise reduction reduces random background noise while preserving meaningful signals. It adds a characteristic “hollow” sound to all signals. NR turns noise reduction on. It doesn’t apply to DATA or FM modes, or with AGC turned off. Hold ADJ to display the NR setting, which is saved per-mode. Use the VFO B knob to tailor NR for the present band conditions. In general, the higher the number, the more aggressive the noise reduction. Settings F1-1 through F4-4 are recommended. F5-1 through F8-4 use a different algorithm, where the -x part of the setting indicates the degree of mix between the DSP-processed and unprocessed signals (-1 is about 50% processed, -4 is 100%). A small M appears to remind you that a Mixed setting is in effect, e.g. NRM F5-1. /quote also from: http://www.elecraft.com/K3/K3FAQ.htm quote How does the Noise Reduction work? NR depends on correlation of the present input with previous input. The system does not actually provide Noise Reduction; it provides Signal Selection. In other words, its default is to pass nothing at all. It has to believe there is a signal present, and then it builds a filter, or set of filters, around the spectral components of the signal it thinks is there. Random noise has no correlation, voice has moderate but not perfect (unless you whistle a pure tone) and CW has excellent correlation. As a result, noise is heavily suppressed (no filter is built to pass it), voice is partially suppressed (hence it needs some additional gain to compensate for this effect so the same AF level will produce about the same audio level with a moderate S/N speech signal) and CW is hardly suppressed at all (hence it does not need any gain boost). NR is not recommended in Data Mode. Data is already getting a matched filter in the demodulator. You might lose a few symbols as the NR settles around the signal, and it might suppress a very weak signal that you could otherwise copy. NR in the end is intended for modes you listen to. /quote lastly I saved this gem of a post from Jack WA9FVP Re: [Elecraft] [K3]Noise Filter (NF) ADJ wa9fvp Thu, 27 Dec 2012 16:19:36 -0800 There's no documentation but as far as I can tell-- F1-x through F4-x defines the amount of noise reduction or how aggressive the filter attacks the I.F. noise. F5-X through F8-X defines the amount of reduction and the level that's mixed with the filtered and non-filtered I.F. Note that m which means mix will appear after F5-X and above. X defines the delay. Delay is the amount of time it takes for the filter to converge on a non-sinusoidal signal or the noise. The higher the number, the longer it takes for the noise to reduce to a low level. I hope this helps. Jack WA9FVP F1-x through F4-x are for CW F5-x through F8-x are for SSB -- GB 73 K5OAI Sam Morgan __ 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 Message delivered to arch...@mail-archive.com
[Elecraft] K3 FAQ webpage broken?
I'm not sure if it is just something on my end or what, but when I try to click on any link with in the http://www.elecraft.com/K3/K3FAQ.htm page I get thrown into a page that shown nothing about what I clicked on, such as the noise reduction link which points to: http://www.elecraft.com/#NR I would think the link might should be something like: http://www.elecraft.com/K3/K3FAQ/#NR but that fails also...? the only way to view the info about any of the FAQ's on that page is to scroll down on the http://www.elecraft.com/K3/K3FAQ.htm page which is working. Also the 2 images on that page fail to load. I tried this on FireFox, IE11, Google Chrome. I looked at the source code for the page but it's over my head with all the td class=gsc-orderby-container and such mumbo jumbo :-( wild guess ... it may have something to do with the: base href=/ I see near the top. good luck mr webmaster, hi hi. -- GB 73 K5OAI Sam Morgan __ 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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] K3 FAQ webpage broken?
Looks like this HTML tag may be breaking the page anchor links. I dropped a note to the webmaster. base href=/ view-source:http://www.elecraft.com/ / Regards, David McAnally WD5M K3 SN 6493 On Sun, Aug 31, 2014 at 4:48 PM, Sam Morgan k5oai@gmail.com wrote: I'm not sure if it is just something on my end or what, but when I try to click on any link with in the http://www.elecraft.com/K3/K3FAQ.htm page I get thrown into a page that shown nothing about what I clicked on, such as the noise reduction link which points to: http://www.elecraft.com/#NR I would think the link might should be something like: http://www.elecraft.com/K3/K3FAQ/#NR but that fails also...? the only way to view the info about any of the FAQ's on that page is to scroll down on the http://www.elecraft.com/K3/K3FAQ.htm page which is working. Also the 2 images on that page fail to load. I tried this on FireFox, IE11, Google Chrome. I looked at the source code for the page but it's over my head with all the td class=gsc-orderby-container and such mumbo jumbo :-( wild guess ... it may have something to do with the: base href=/ I see near the top. good luck mr webmaster, hi hi. -- GB 73 K5OAI Sam Morgan __ 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 Message delivered to david.mcana...@gmail.com __ 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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] EME Radio - 144mhz Transverter or 2m Module
Excellent comments, Oliver. I've not done EME (too many tall trees in the way), but I do own an XV144, and recently set it up with a vintage Mirage 2W in to 150W out brick amp of pre-MFJ vintage. Some thoughts based on my experience. The internal transverter is rated for about 10W, the external unit for 20W. Both should be carefully cooled and derated for keydown modes, which is one reasonI sought out that particular Mirage. The other reason is that minimizing temperature rise in either transverter improves frequency stability. To minimize heat in the XV144, it should be driven from the K3 so that 1 mW generates full rated power. Running the transverter at reduced output also helps. Since I need only 2W drive, I've set up my XV144 so that 1 mW in yields 10 W out. For whatever reason, both my XV144, as well as my XV220 that has been on long term loan to neighbor K6EU, both have some degree of instability, to the extent that both behave differently with top cover on and off. One thing I suspect as a cause is poor EMC practice. The antenna connector is bonded to the chassis, but BNC connectors for interface to the transceiver are insulated from the chassis. My XVs are fairly old -- I bought them used in 2005 already built, so perhaps current production is better in this regard. And the XV144 did get a glowing review in QST. 73, Jim K9YC On Sun,8/31/2014 8:25 AM, Oliver Dröse wrote: Hi Rich, don't know the external one (XV144) myself so cannot comment. The internal one (K144XV) has one drawback: no adequate cooling! Cooling is done only passively using the left side of the enclosure. As JT65 on EME is a key-down mode you will see that power drops soon and dramatically, i.e. starting with 10 watts it will drop down to 5-6 watts after 2-3 overs already due to missing heat dissipation. So you will want to do some external cooling to lessen that effect (but you will not completely get rid of it from my experience). Besides this the K144XV is very sensitive, whenever I use mine I switch off the external pre-amp which is needed for all other transceivers overhere. :-) And don't forget to order the K144RFLK to keep the frequency stable. What you should also consider is which amplifier you want to use. So the XV144 might be the better solution if you need more drive power. If you want to think outside the box you can also check other manufacturers. For serious contesting and EME I'm using the HA1YA transverter ME2HT-PRO with +30 dBm mixer (http://www.ha1ya.hu/htmkepek/me2t_protransverterspec.htm) and 60 watts (including adequate cooling) to drive a GS35 amp. HTH - hope that helps! 73, Olli - DH8BQA Contest, DX radio projects: http://www.dh8bqa.de Am 30.08.2014 14:26, schrieb Richard Thorne: I'm starting to get the bug to try something different and EME has grabbed my attention. I already have a couple K3's and would like to put one to use for EME. Which is the better option the external 144mhz transverter or the internal 2m option? Thanks Rich - N5ZC __ 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 Message delivered to dro...@necg.de __ 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 Message delivered to j...@audiosystemsgroup.com __ 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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] FTDX5000 Design Flaw
On Sat,11/20/2010 12:48 PM, John, KI6WX wrote: The ARRL is aware of this issue. This problem was discussed in my 1988 articles on phase noise in QST (March April issues). The article notes that a high phase noise transmitter degrades the performance of a low phase noise receiver to that of the transmitter. This article started the ARRL making composite transmit noise measurements. I've recently added fuel to the fire with an online document plotting ARRL TX data for multiple radios on the same graphs, making comparison's easier. I did that by taking data point by point off of ARRL's published plots, then putting them in my own spreadsheet. I did that for both keying spectra and phase noise. Seeing that document, Bob Allison sent me the raw data for the CW keying spectra for those radios, and I've been processing and plotting that data. He was not able to provide the phase noise data in electronic form, so we're stuck with what I am able to eyeball from the published plots. You can see an in-progress version at k9yc.com/TXNoise.pdf 73, Jim K9YC __ 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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] K3 FAQ webpage broken?
This one works for me: http://www.elecraft.com/K3/K3FAQ.htm#NR 73, Matt VK2RQ On 1 Sep 2014, at 7:48 am, Sam Morgan k5oai@gmail.com wrote: I'm not sure if it is just something on my end or what, but when I try to click on any link with in the http://www.elecraft.com/K3/K3FAQ.htm page I get thrown into a page that shown nothing about what I clicked on, such as the noise reduction link which points to: http://www.elecraft.com/#NR I would think the link might should be something like: http://www.elecraft.com/K3/K3FAQ/#NR but that fails also...? the only way to view the info about any of the FAQ's on that page is to scroll down on the http://www.elecraft.com/K3/K3FAQ.htm page which is working. Also the 2 images on that page fail to load. I tried this on FireFox, IE11, Google Chrome. I looked at the source code for the page but it's over my head with all the td class=gsc-orderby-container and such mumbo jumbo :-( wild guess ... it may have something to do with the: base href=/ I see near the top. good luck mr webmaster, hi hi. -- GB 73 K5OAI Sam Morgan __ 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 Message delivered to matt.vk...@gmail.com __ 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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] K3 FAQ webpage broken?
Yes, works if you scroll down, Matt -- which I had not thought to do. But the links at the top of that page all seem to take me to the Elecraft home page. I guess that's the broken part. Phil W7OX On 8/31/14, 3:54 PM, Matt VK2RQ wrote: This one works for me: http://www.elecraft.com/K3/K3FAQ.htm#NR 73, Matt VK2RQ On 1 Sep 2014, at 7:48 am, Sam Morgan k5oai@gmail.com wrote: I'm not sure if it is just something on my end or what, but when I try to click on any link with in the http://www.elecraft.com/K3/K3FAQ.htm page I get thrown into a page that shown nothing about what I clicked on, such as the noise reduction link which points to: http://www.elecraft.com/#NR I would think the link might should be something like: http://www.elecraft.com/K3/K3FAQ/#NR but that fails also...? the only way to view the info about any of the FAQ's on that page is to scroll down on the http://www.elecraft.com/K3/K3FAQ.htm page which is working. Also the 2 images on that page fail to load. I tried this on FireFox, IE11, Google Chrome. I looked at the source code for the page but it's over my head with all the td class=gsc-orderby-container and such mumbo jumbo :-( wild guess ... it may have something to do with the: base href=/ I see near the top. good luck mr webmaster, hi hi. -- GB 73 K5OAI Sam Morgan __ 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 Message delivered to matt.vk...@gmail.com __ 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 Message delivered to w...@socal.rr.com __ 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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] K3 FAQ webpage broken?
No need to scroll down with the link I provided -- the browser will place the corresponding anchor at the top of the window (unless the anchor is too close to the bottom of the page). The links at the top of the FAQ page are indeed all broken, and need to include the file name of the FAQ page immediately before the #tag. 73, Matt VK2RQ On 1 Sep 2014, at 9:10 am, Phil Wheeler w...@socal.rr.com wrote: Yes, works if you scroll down, Matt -- which I had not thought to do. But the links at the top of that page all seem to take me to the Elecraft home page. I guess that's the broken part. Phil W7OX On 8/31/14, 3:54 PM, Matt VK2RQ wrote: This one works for me: http://www.elecraft.com/K3/K3FAQ.htm#NR 73, Matt VK2RQ On 1 Sep 2014, at 7:48 am, Sam Morgan k5oai@gmail.com wrote: I'm not sure if it is just something on my end or what, but when I try to click on any link with in the http://www.elecraft.com/K3/K3FAQ.htm page I get thrown into a page that shown nothing about what I clicked on, such as the noise reduction link which points to: http://www.elecraft.com/#NR I would think the link might should be something like: http://www.elecraft.com/K3/K3FAQ/#NR but that fails also...? the only way to view the info about any of the FAQ's on that page is to scroll down on the http://www.elecraft.com/K3/K3FAQ.htm page which is working. Also the 2 images on that page fail to load. I tried this on FireFox, IE11, Google Chrome. I looked at the source code for the page but it's over my head with all the td class=gsc-orderby-container and such mumbo jumbo :-( wild guess ... it may have something to do with the: base href=/ I see near the top. good luck mr webmaster, hi hi. -- GB 73 K5OAI Sam Morgan __ 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 Message delivered to matt.vk...@gmail.com __ 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 Message delivered to w...@socal.rr.com __ 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 Message delivered to arch...@mail-archive.com
[Elecraft] ] EME Radio - 144mhz Transverter or 2m Module
Hello Rich, You may also wish to consider transverters from Down East Microwave. They are good at power and frequency stability. Do some search in this elecraft email listing, you will find some discussion in the past about XV144. 73 Johnny VR2XMC 寄件人︰ Oliver Dröse dro...@necg.de 收件人︰ elecraft@mailman.qth.net 傳送日期︰ 2014年08月31日 (週日) 11:25 PM 主題︰ Re: [Elecraft] EME Radio - 144mhz Transverter or 2m Module Hi Rich, don't know the external one (XV144) myself so cannot comment. The internal one (K144XV) has one drawback: no adequate cooling! Cooling is done only passively using the left side of the enclosure. As JT65 on EME is a key-down mode you will see that power drops soon and dramatically, i.e. starting with 10 watts it will drop down to 5-6 watts after 2-3 overs already due to missing heat dissipation. So you will want to do some external cooling to lessen that effect (but you will not completely get rid of it from my experience). Besides this the K144XV is very sensitive, whenever I use mine I switch off the external pre-amp which is needed for all other transceivers overhere. :-) And don't forget to order the K144RFLK to keep the frequency stable. What you should also consider is which amplifier you want to use. So the XV144 might be the better solution if you need more drive power. If you want to think outside the box you can also check other manufacturers. For serious contesting and EME I'm using the HA1YA transverter ME2HT-PRO with +30 dBm mixer (http://www.ha1ya.hu/htmkepek/me2t_protransverterspec.htm) and 60 watts (including adequate cooling) to drive a GS35 amp. HTH - hope that helps! 73, Olli - DH8BQA Contest, DX radio projects: http://www.dh8bqa.de Am 30.08.2014 14:26, schrieb Richard Thorne: I'm starting to get the bug to try something different and EME has grabbed my attention. I already have a couple K3's and would like to put one to use for EME. Which is the better option the external 144mhz transverter or the internal 2m option? Thanks Rich - N5ZC __ 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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] FTDX5000 Design Flaw
Jim, Thanks for your analysis of transmitted phase and keying noise of various transceivers. I'd like to provide a couple of technical details, and to give credit where it is due. To achieve the excellent results shown in your paper for the K3, we used a combination of four techniques: 1. A hybrid PLL/DDS synthesizer with a very high C/L ratio VCO: Many of the radios shown in your plots use unfiltered DDS for their VFO, or in the case of PLL designs, VCOs with a much higher C/L ratio than the K3. Both of these design decisions can increase phase noise and dynamic artifacts. To preserve a consistently high C/L ratio, we use up to 128 different C/L combinations as the VCO is band-switched. (This is in contrast to the usual 1, 2, or 3 VCO C/L ranges used in other rigs.) We also used very narrow-band crystal filtering of the DDS output to completely remove any of the usual spurs due to quantization, etc. John Grebenkemper assisted greatly with the synthesizer design. 2. Transmit ALC with long time-constant, pre-calculated power calibration, and virtually no dynamic artifacts: The K3's transmit ALC is, in effect, open-loop in relation to keying waveform rise/fall timing. In other words, we do not apply power corrections over short periods, since this can distort the keying envelope. This is especially noticeable in CW mode but applies to T/R switching in other modes as well. 3. Conversion to a low I.F., with both RX and TX signals running through a narrow crystal filter: This band-limits I.F. noise from early stages (DSP and D-to-A converter) and helps establish a very low transmit noise floor ahead of the main mixer. Even in speech modes, all fast ALC is applied ahead of the crystal filter, which I believe is unique to the K3. 4. Sigmoidal keying waveform applied at the DSP: Our DSP engineer (Lyle Johnson, KK7P) studied the sidebands resulting from various sigmoidal and raise-cosine modulation envelopes. He selected the one that provided the smallest keying bandwidth consistent with rise and fall times of approximately 4 ms. One clarification. The reason we created the K3's QRQ mode was to provide faster full break-in at very high code speeds (up to 100 WPM). The keying dynamics and phase noise are the same with QRQ mode either on or off; they are not soft with QRQ mode on. The KPA500 amplifier also switches very fast, so it is fully compatible with either mode. 73, Wayne N6KR On Aug 31, 2014, at 3:40 PM, Jim Brown j...@audiosystemsgroup.com wrote: On Sat,11/20/2010 12:48 PM, John, KI6WX wrote: The ARRL is aware of this issue. This problem was discussed in my 1988 articles on phase noise in QST (March April issues). The article notes that a high phase noise transmitter degrades the performance of a low phase noise receiver to that of the transmitter. This article started the ARRL making composite transmit noise measurements. I've recently added fuel to the fire with an online document plotting ARRL TX data for multiple radios on the same graphs, making comparison's easier. I did that by taking data point by point off of ARRL's published plots, then putting them in my own spreadsheet. I did that for both keying spectra and phase noise. Seeing that document, Bob Allison sent me the raw data for the CW keying spectra for those radios, and I've been processing and plotting that data. He was not able to provide the phase noise data in electronic form, so we're stuck with what I am able to eyeball from the published plots. You can see an in-progress version at k9yc.com/TXNoise.pdf 73, Jim K9YC __ 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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] FTDX5000 Design Flaw [typo]
Typo: Change ...or in the case of PLL designs, VCOs with a much higher C/L ratio than the K3... to ...or in the case of PLL designs, VCOs with a much *lower* C/L ratio than the K3. Wayne N6KR On Aug 31, 2014, at 7:17 PM, Wayne Burdick n...@elecraft.com wrote: Jim, Thanks for your analysis of transmitted phase and keying noise of various transceivers. I'd like to provide a couple of technical details, and to give credit where it is due. To achieve the excellent results shown in your paper for the K3, we used a combination of four techniques: 1. A hybrid PLL/DDS synthesizer with a very high C/L ratio VCO: Many of the radios shown in your plots use unfiltered DDS for their VFO, or in the case of PLL designs, VCOs with a much higher C/L ratio than the K3. Both of these design decisions can increase phase noise and dynamic artifacts. To preserve a consistently high C/L ratio, we use up to 128 different C/L combinations as the VCO is band-switched. (This is in contrast to the usual 1, 2, or 3 VCO C/L ranges used in other rigs.) We also used very narrow-band crystal filtering of the DDS output to completely remove any of the usual spurs due to quantization, etc. John Grebenkemper assisted greatly with the synthesizer design. __ 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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] FTDX5000 Design Flaw
This is why that on more than one occasion over the years I've said (only semi-facetiously) that the two-tone testing of the receiver portion of a transceiver should be performed using two other like transceiver transmitters, running rated output power, as the two test tones. When our transmitters are as pure as HP-8663s then we can go back to using them for receiver testing. Wes N7WS On 8/31/2014 3:40 PM, Jim Brown wrote: On Sat,11/20/2010 12:48 PM, John, KI6WX wrote: The ARRL is aware of this issue. This problem was discussed in my 1988 articles on phase noise in QST (March April issues). The article notes that a high phase noise transmitter degrades the performance of a low phase noise receiver to that of the transmitter. This article started the ARRL making composite transmit noise measurements. I've recently added fuel to the fire with an online document plotting ARRL TX data for multiple radios on the same graphs, making comparison's easier. I did that by taking data point by point off of ARRL's published plots, then putting them in my own spreadsheet. I did that for both keying spectra and phase noise. Seeing that document, Bob Allison sent me the raw data for the CW keying spectra for those radios, and I've been processing and plotting that data. He was not able to provide the phase noise data in electronic form, so we're stuck with what I am able to eyeball from the published plots. You can see an in-progress version at k9yc.com/TXNoise.pdf 73, Jim K9YC __ 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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] FTDX5000 Design Flaw
On Sun,8/31/2014 7:17 PM, Wayne Burdick wrote: I'd like to provide a couple of technical details, and to give credit where it is due. Thanks Wayne. I was aware of some of this, but didn't want to show any more of your cards than you chose. Your comments will make a fine sidebar. 73, Jim K9YC __ 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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] FTDX5000 Design Flaw
On Sun,8/31/2014 8:17 PM, Wes (N7WS) wrote: This is why that on more than one occasion over the years I've said (only semi-facetiously) that the two-tone testing of the receiver portion of a transceiver should be performed using two other like transceiver transmitters, running rated output power, as the two test tones. When our transmitters are as pure as HP-8663s then we can go back to using them for receiver testing. Wes N7WS Great idea, Wes. I had to read through it twice to get it. :) 73, Jim __ 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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] EME with K3 /XV144
A couple of notes on using the XV144 for EME: 1. The crystal oven option helps stability. Allow 30-minute warmup. 2. Max power for JT65 is 10 watts, but cooling is inadequate. I use a small muffin fan attached to the desktop that blows air under the XV144 and works perfectly. The extra noise is imperceptible over the hurricane created by 4 fans that keep the 3CX800 amp from blowing up. Again. 3. My K3 has the high-stability oscillator, but no external reference. This works fine. 4. As I recall, the internal 2m module is not as stable as the XV144. The output for continuous duty is much lower. You will have more amp flexibility with the external XV144. And it's fun to build. 5. As Jim suggested, use the milliwatt output from the K3 for less heat inside the XV144. 6. On one rare night I blew up both my external pre-amp and the backup--I could still hear the louder stations. The NF of the XV144 is good, but an external pre-amp will help a lot. My short 7/8 Heliax run helps, too. 7. For many EME'ers, initials are as important as new grids. This means that even a lowly W6 will be in demand when you first get on the air. You WILL have fun. 73 Eric WD6DBM Sent from Yahoo Mail on Android __ 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 Message delivered to arch...@mail-archive.com
