Re: [Elecraft] K3 Questions
On 6/27/07, Corboy-Poteet <[EMAIL PROTECTED]> wrote: I am not a big voice mode fan but I do believe that SSB is headed toward the same ditch currently occupied by AM. Maybe Elecraft can help set the direction for future voice modes. Isn't digital voice just another fad like some of the new data modes? I don't know much about it, but as a digital mode, I guess that you get perfect copy until the signal falls below a certain level, after which you don't hear anything at all. This seems to be counter to the main ham radio interest of working weak DX stations. I understand people's interest in experimenting, but don't see any real use for digital voice on the HF bands. As an experimental mode it seems inappropriate to support it directly within the K3. -- Julian, G4ILO G4ILO's Shack: www.g4ilo.com K2 s/n: 392 K3 s/n: ??? www.Ham-Directory.com: the best ham resources on the net ___ 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
Re: [Elecraft] Elecraft Shipping time to UK
On Tue, 19 Jun 2007, David Ferrington, M0XDF wrote: > Can anyone give me an idea of the time is takes for goods to reach the UK? > I'm away most of August and if Elecraft ship my K3 at end of July, it might > just sit in Royal mail for 5 days, before I can get it - they will then > return it to Elecraft :-) > Further to the discussions surrounding ParcelFarce's treatment of incoming goods, and my only experience with them is through buying Elecraft bits, I'm having trouble on my latest purchase that I thought I'd share. I ordered a KAT2 auto-atu kit on or around June 10th and got the usual, prompt and friendly email informing me that it shipped on June 11th. It still hasn't arrived in the UK, 16 days later. Using the tracking number, supplied by Lisa, shows that it was last seen on 14th June whan it was marked "Left Origin Country". ParcelFarce's track & Trace shows it to be in status "Handed Over" whatever that means. I seem to remember previous packages show "Arrived at hub" and "Awaiting Customs clearance" etc, but I don't recall anyhting sitting at "Handed Over" for 13 days before. Lisa reports that others are reporting missing/delayed parcels that were shipped on the 11th. Is anyone else having this problem? Has anyone (UK or US) taken delivery of a parcel that shipped from Aptos on the 11th June? Cheers, John -- G-GRP-Club 2377, QRP-ARCI 12384, SKCC 3214 Member : RSGB, ARRL Shetland Islands (EU-012) IP90GG Lerwick Radio Club : http://www.gm3zet.org ___ 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
Re: [Elecraft] K3 Questions
On Wed, 27 Jun 2007, Julian G4ILO wrote: > On 6/27/07, Corboy-Poteet <[EMAIL PROTECTED]> wrote: > > > > I am not a big voice mode fan but I do believe that SSB is headed > > toward the same ditch currently occupied by AM. Maybe Elecraft can > > help set the direction for future voice modes. > > Isn't digital voice just another fad like some of the new data modes? > I don't know much about it, but as a digital mode, I guess that you > get perfect copy until the signal falls below a certain level, after > which you don't hear anything at all. ...then you switch to analogue SSB until the signal goes below the threshold of S/N that makes SSB readable, after which you switch to CW and give yourself another 17dB to play with... > This seems to be counter to the main ham radio interest of working > weak DX stations. I understand people's interest in experimenting, but > don't see any real use for digital voice on the HF bands. I think the same about analogue voice modes ;-) Cheers, John GM4SLV -- G-GRP-Club 2377, QRP-ARCI 12384, SKCC 3214 Member : RSGB, ARRL Shetland Islands (EU-012) IP90GG Lerwick Radio Club : http://www.gm3zet.org ___ 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] clipped cw on k2
! wonder if anyone can help? I have a k2 No 5914. The problem concerns when sending cw the dits and dahs seem to be clipped making it very difficult to send good morse. I suspected rf getting into some part of the rig but I have change antenna to a dipole, grounded the case of the K2 but the problem persists. I have also ajusted the weighting in "dot" but still the problem remains. Any help would be most welcome. By the way. Here the nail biting begins. Just ordered K3. Fingers will never last until Nov. Regards to all. Trev GW4IMC ___ 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 - 2.7 kHz Shape Factor
K3RIZ: >Can anyone give me the shape factor for the Elecraft supplied, 5 pole, 2.7 kHz filter? I was hoping Wayne might respond since we are now within 1 month of shipments and we'll soon need to decide whether to go with the 5-pole 2.7k or the 8-pole 2.8k. In addition to plots of the 5-pole filters (like already exist for the 8-poles), I'm waiting to see some IMD/BDR results for all filters. Ten-Tec, Icom and Yaesu have had some disappointing IMD/BDR results published for Orion, the IC-7800 and the FT-2000 *after* introduction, so I hope Elecraft does not repeat the same mistake with the K3. My guess about the 5-pole is that it will have a 6/60 dB shape factor a little better than 5:1. This is about what the Ten-Tec 4-pole filters are and a 5-pole should be a little better...perhaps ~4:1. Let's also remember that the shape factor of a roofing filter is not so critical as if it were being used to determine ultimate selectivity. In rigs like the K3, ultimate selectivity is determined by the DSP filters which will have excellent shape factors. In DSP rigs, the most critical area of a roofing filter for it's intended purpose of IMD performance is down to about 30 dB on the filter skirts (i.e. not 60 dB as measured by the classical "shape factor"). From the FAQ of Inrad's paper on roofing filters by W2VJN: "5. If 6 poles work so well, why not 8 poles? The most important part of the filter characteristic is from the pass-band on down to about 30 dB on either side of center. Eight poles would provide much better stop-band isolation, but its not required in a roofing filter and would make no noticeable improvement in IMD performance." http://www.qth.com/inrad/roofing-filters.pdf 73, Bill W4ZV ___ 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] K2 Frequency Adjust
I noticed my K2 frequency is a bit off. I zero-beat WWV at .95 and will use the N6KR method for setting the 4 MHz reference oscillator. But, I noticed this, too. If I switch from CW to CW-R, the carrier tone is the same. But, if I then go from LSB to USB the 600 hz. WWV reference tone is 590 hz in LSB and 620 hz in USB. What do I need to adjust to get the 600 hz WWV reference tones to be 600 hz in both LSB and USB? Thanks to Spectrogram for making this nit-picking possible :-) 73 de K1ESE John ___ 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
Re: [Elecraft] K3 - 2.7 kHz Shape Factor
From Bill Tippett <[EMAIL PROTECTED]> From the FAQ of Inrad's paper on roofing filters by W2VJN: "5. If 6 poles work so well, why not 8 poles? Eight poles would provide much better stop-band isolation, but it's not required in a roofing filter and would make no noticeable improvement in IMD performance." --- A moot point I would suggest Bill when the symmetry (or lack of) a Ladder filter's response is also considered. The more poles the better in a Ladder roofing filter to improve symmetry provided that the IMD generated within the filter does not become a limiting factor, a point that Jack K8ZOA has noted. To preach to the choir, filter IMD performance is usually measured early on in a receiver's design exercise prior to fixing the Gain Distribution. 73, Geoff GM4ESD ___ 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
Re: [Elecraft] K2 Frequency Adjust
John, If you go through the whole alignment procedure for the K2 Dial Calibration, those shifts will go away. If they get smaller but do not disappear, then just do it over again. It is important for you to do the entire procedure each time - set the 4 MHz reference oscillator, then run CAL PLL, then 'change' *each* BFO setting. If your BFOs are set to properly position the passbands, you do not actually have to alter the BFO setting, but you do have to make the firmware think it has been changed - move the BFO frequency a small bit and then move it back to where it was so the processor will think it has been changed and it will write new DAC values into the EEPROM. You must do that for each BFO separately. If you are within 20 Hz of 10 MHz WWV, that is close to the limit of the DAC resolution, and you may not be able to get it any closer than that - but you can try for 10 Hz if you have enough patience. 73, Don W3FPR John Huffman wrote: I noticed my K2 frequency is a bit off. I zero-beat WWV at .95 and will use the N6KR method for setting the 4 MHz reference oscillator. But, I noticed this, too. If I switch from CW to CW-R, the carrier tone is the same. But, if I then go from LSB to USB the 600 hz. WWV reference tone is 590 hz in LSB and 620 hz in USB. What do I need to adjust to get the 600 hz WWV reference tones to be 600 hz in both LSB and USB? Thanks to Spectrogram for making this nit-picking possible :-) 73 de K1ESE John ___ 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] K2 Glitch on Field Day
I've seen a couple of posts about folks having some interesting "problems" with their K2s on Field Day. I also had an "event," and wonder if anyone else has seen this problem before. After operating most of Saturday afternoon, I turned off my K2/100 around 6 to break for supper. Since my wife had invited her brothers and sisters for a picnic, it was around 8 when I turned my radio on again. When I transmitted to answer a CQ FD, I saw the display show "PA HOT" and no apparent output power. I cycled the radio off and on again, but got the same message when I tried to transmit. The correct antenna input was selected, but the KAT100 wouldn't tune. When I pressed the Tune button it just displayed 20 and 1:1. I tried both CW and SSB with the same result. I tried switching from 20 m to 40 m with the same result. I turned off the radio again and went to visit with my cousin and her husband for another hour or so. When I came back, I even tried connecting my ac power supply to see if the battery voltage was dropping too low for some reason. The PA HOT message came on each time I tried to transmit. Finally I tried reducing power to below 10 W. Now the tuner would work, and I could transmit, but going above 10 W gave the PA HOT message again. I finally brought the radio and tuner inside for the night and gave up. Sunday morning I set the radio up again, and this time everything was fine. No problems, full power, CW and SSB, everything worked fine for the rest of Field Day! Any ideas on what may have been going on? There were no storms, the air was dry, the temperature was a bit cool, dropping into the low 60s. For anyone who worked WB3IOS 1B EPA, thanks for the contact! 73, Larry Wolfgang, WR1B ___ 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
Re: [Elecraft] K3 Questions.& ..DVoice
At 03:29 AM 6/27/2007, John GM4SLV wrote: On Wed, 27 Jun 2007, Julian G4ILO wrote: ...then you switch to analogue SSB until the signal goes below the threshold of S/N that makes SSB readable, after which you switch to CW and give yourself another 17dB to play with... when icom demos their dstar digital audio, they suggest that the digital will work 'deeper' into the noise than the "analog". my concern when a fireman or cop is at the fringe,,, which will get thru the message ??? who cares if it is scratchy if it gets thru... kinda like us . did we make the contact , get the info or not. Already there is some flak i read about background noise at a fire scene can confuse and disrupt CURRENT digital audio on public service radios. Would be cool for Digital Lyle ( eric&wayne) to have a digital audio mode available for the k3 esp if we can change out the algorithm as they improve... bill ___ 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
Re: [Elecraft] clipped cw on k2
Trev, By 'clipped' do you mean an actual clipped waveshape? If so, check the two capacitors mounted on the back of the Control Board at U10 and Q8. These are associated with the Keying Waveshape circuit and if not connected to the proper points will distort the normal keying waveshape. 73, Don W3FPR TREVOR WATERS wrote: ! wonder if anyone can help? I have a k2 No 5914. The problem concerns when sending cw the dits and dahs seem to be clipped making it very difficult to send good morse. I suspected rf getting into some part of the rig but I have change antenna to a dipole, grounded the case of the K2 but the problem persists. I have also ajusted the weighting in "dot" but still the problem remains. Any help would be most welcome. By the way. Here the nail biting begins. Just ordered K3. Fingers will never last until Nov. Regards to all. Trev GW4IMC ___ 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 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
Re: [Elecraft] K2 Glitch on Field Day
Larry, Seems strange that this came up after your rig was sitting but I will tell you about my experiences with a toasty PA I have not ever seen the message PA Hot but I certainly have noticed the PA getting hot and in a couple of instances cause the rig to shut down/reboot. I operate alot of CW during contests and am constantly cqing and working stations. I have a simple cure. Using just a touch of double back tape I mounted a DC muffin fan on top of the PA (blowing air on to the PA). Instead of wiring it directly to the K2 I just put it on a powerpole strip. We had a 100 degree field day this year and the rig ran flawlessly. All indications are that the this is cured on the K3. It will have 2 nice size variable fans. Jay - KT5E Wolfgang, Larry, WR1B wrote: I've seen a couple of posts about folks having some interesting "problems" with their K2s on Field Day. I also had an "event," and wonder if anyone else has seen this problem before. After operating most of Saturday afternoon, I turned off my K2/100 around 6 to break for supper. Since my wife had invited her brothers and sisters for a picnic, it was around 8 when I turned my radio on again. When I transmitted to answer a CQ FD, I saw the display show "PA HOT" and no apparent output power. I cycled the radio off and on again, but got the same message when I tried to transmit. The correct antenna input was selected, but the KAT100 wouldn't tune. When I pressed the Tune button it just displayed 20 and 1:1. I tried both CW and SSB with the same result. I tried switching from 20 m to 40 m with the same result. I turned off the radio again and went to visit with my cousin and her husband for another hour or so. When I came back, I even tried connecting my ac power supply to see if the battery voltage was dropping too low for some reason. The PA HOT message came on each time I tried to transmit. Finally I tried reducing power to below 10 W. Now the tuner would work, and I could transmit, but going above 10 W gave the PA HOT message again. I finally brought the radio and tuner inside for the night and gave up. Sunday morning I set the radio up again, and this time everything was fine. No problems, full power, CW and SSB, everything worked fine for the rest of Field Day! Any ideas on what may have been going on? There were no storms, the air was dry, the temperature was a bit cool, dropping into the low 60s. For anyone who worked WB3IOS 1B EPA, thanks for the contact! 73, Larry Wolfgang, WR1B ___ 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 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
Re: [Elecraft] K2 Glitch on Field Day
Larry, In the past, I have seen several reports of the erroneous PA HOT message behavior - it seems to me that it typically happens during a portable operating situation - perhaps caused by some mysterious power glitch or something like that. I really don't know the reason behind this loss of the setting. An additional thought is that it may be caused by operating the KPA100 with strong direct sunlight beaming onto the KPA100 heatsink - the black surface will absorb heat (just the same way as it dissipates it) and could cause the heatsink to actually overheat from the sunlight. The physics of a 'black body radiator' are what is involved here - it will absorb heat just as easily as it radiates heat. In any case, what has happened is that the menu entry for 'CAL tPA' may been lost (it usually goes to 255). The solution is to re-enter the proper value for that menu item. The 'real' setting is the actual temperature (in degrees C) of the PA transistor case (or the heat sink next to the PA transistors) - so if you have a good temperature indicating meter, you can set it no matter what the temperature may be. For those folks without such a temperature meter, the easiest way is to let the K2/100 acclimate to the ambient temperature (idle for a couple hours) then look at a normal thermometer and read the temperature (convert to deg. C if the reading is in deg. F) and enter that value into the CAL tPA menu parameter. 73, Don W3FPR Wolfgang, Larry, WR1B wrote: I've seen a couple of posts about folks having some interesting "problems" with their K2s on Field Day. I also had an "event," and wonder if anyone else has seen this problem before. After operating most of Saturday afternoon, I turned off my K2/100 around 6 to break for supper. Since my wife had invited her brothers and sisters for a picnic, it was around 8 when I turned my radio on again. When I transmitted to answer a CQ FD, I saw the display show "PA HOT" and no apparent output power. I cycled the radio off and on again, but got the same message when I tried to transmit. The correct antenna input was selected, but the KAT100 wouldn't tune. When I pressed the Tune button it just displayed 20 and 1:1. I tried both CW and SSB with the same result. I tried switching from 20 m to 40 m with the same result. I turned off the radio again and went to visit with my cousin and her husband for another hour or so. When I came back, I even tried connecting my ac power supply to see if the battery voltage was dropping too low for some reason. The PA HOT message came on each time I tried to transmit. Finally I tried reducing power to below 10 W. Now the tuner would work, and I could transmit, but going above 10 W gave the PA HOT message again. I finally brought the radio and tuner inside for the night and gave up. ___ 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
RE: [Elecraft] K2 Glitch on Field Day
For the benefit of those of us who struggle with remembering the two conversion formula for degrees F to degrees C (or vice versa) here is a neat little algebra expression I teach: 5F - 9C = 160 Substitute and solve for the remaining unknown. -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Don Wilhelm Subject: Re: [Elecraft] K2 Glitch on Field Day ... read the temperature (convert to deg. C if the reading is in deg. F) and enter that value into the CAL tPA menu parameter. ___ 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
Re: [Elecraft] K2 Glitch on Field Day
Hi Larry: I've gotten the "PA HOT" warning when my K2/100 was in the car and had been left outside on a less-than 40-degree F night! The problem, in my case, was that the firmware (unfortunately, I can't recall the version number, but it was relatively new) wasn't able to account for REALLY LOW temps and the DAC would 'roll over', past '0', and back to 255 (I think) and then appear to be indicating a HIGH temp, when just the opposite was the case. I'd actually have to allow the rig to warm up in order to get the warning (and lock-out) to allow me to operate. I mentioned this problem to Wayne and since that time, he's rewritten the temp sensing part of the firmware to accommodate low temps and to NOT have the PA HOT warning show up. Is it possible that your K2 got cool enough that it might have experienced the same problem? I believe there is a new firmware release which will address this. 73, Tom N0SS At 09:04 06/27/2007, Wolfgang, Larry, WR1B wrote: I've seen a couple of posts about folks having some interesting "problems" with their K2s on Field Day. I also had an "event," and wonder if anyone else has seen this problem before. After operating most of Saturday afternoon, I turned off my K2/100 around 6 to break for supper. Since my wife had invited her brothers and sisters for a picnic, it was around 8 when I turned my radio on again. When I transmitted to answer a CQ FD, I saw the display show "PA HOT" and no apparent output power. I cycled the radio off and on again, but got the same message when I tried to transmit. The correct antenna input was selected, but the KAT100 wouldn't tune. When I pressed the Tune button it just displayed 20 and 1:1. I tried both CW and SSB with the same result. I tried switching from 20 m to 40 m with the same result. I turned off the radio again and went to visit with my cousin and her husband for another hour or so. When I came back, I even tried connecting my ac power supply to see if the battery voltage was dropping too low for some reason. The PA HOT message came on each time I tried to transmit. Finally I tried reducing power to below 10 W. Now the tuner would work, and I could transmit, but going above 10 W gave the PA HOT message again. I finally brought the radio and tuner inside for the night and gave up. Sunday morning I set the radio up again, and this time everything was fine. No problems, full power, CW and SSB, everything worked fine for the rest of Field Day! Any ideas on what may have been going on? There were no storms, the air was dry, the temperature was a bit cool, dropping into the low 60s. For anyone who worked WB3IOS 1B EPA, thanks for the contact! 73, Larry Wolfgang, WR1B ___ 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 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
Re: [Elecraft] K2 Glitch on Field Day
There is also the conversion I use because I never can remember when and where to add or subtract 32 degrees without thinking about it. Both scales coincide at -40 degrees, so simply add 40 degrees to the temperature to start with, then multiply by 5/9 or 9/5 depending on whether you are converting to a smaller (F to C) value or a larger (C to F) value. After doing the multiplication, subtract 40 degrees and you are done. 73, Don W3FPR KJ3D wrote: For the benefit of those of us who struggle with remembering the two conversion formula for degrees F to degrees C (or vice versa) here is a neat little algebra expression I teach: 5F - 9C = 160 Substitute and solve for the remaining unknown. ___ 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
RE: [Elecraft] K2 Glitch on Field Day
And one more... particularily useful for getting a quick and dirty estimate. It turns out that 61 F = 16 C and 82 F = 28 C. 73, Tom -Original Message- From: Don Wilhelm [mailto:[EMAIL PROTECTED] Sent: Wednesday, June 27, 2007 12:01 PM To: KJ3D Cc: [EMAIL PROTECTED]; 'Wolfgang, Larry, WR1B'; elecraft@mailman.qth.net Subject: Re: [Elecraft] K2 Glitch on Field Day There is also the conversion I use because I never can remember when and where to add or subtract 32 degrees without thinking about it. Both scales coincide at -40 degrees, so simply add 40 degrees to the temperature to start with, then multiply by 5/9 or 9/5 depending on whether you are converting to a smaller (F to C) value or a larger (C to F) value. After doing the multiplication, subtract 40 degrees and you are done. 73, Don W3FPR KJ3D wrote: > For the benefit of those of us who struggle with remembering the two > conversion formula for degrees F to degrees C (or vice versa) here is a neat > little algebra expression I teach: > > 5F - 9C = 160 > > Substitute and solve for the remaining unknown. ___ 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
Re: [Elecraft] K2 Glitch on Field Day
On Wednesday 27 June 2007 12:00:40 Don Wilhelm wrote: > There is also the conversion I use because I never can remember when and > where to add or subtract 32 degrees without thinking about it. The way I remember is that the freezing point of water is zero degrees C and 32 degrees F - and converting one to the other, the zero in each case has to be multiplied by the fraction. So F to C requires 32 to be subtracted before multiplying by 5/9, and C to F, the zero has to be multiplied by 9/5 before adding 32. Ian, G4ICV, AB2GR, K2 #4962 -- ___ 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
Re: [Elecraft] K2 Glitch on Field Day
Easier than that - Work in : Degrees Metres Litres Euros Way to go. A young (62) G3SJJ. Chris Burbanks. Postal code NG12 5NX, D. O. B. 20-04-1945. Info freely given because I have no hangups about not signing emails. Ian Stirling wrote: On Wednesday 27 June 2007 12:00:40 Don Wilhelm wrote: There is also the conversion I use because I never can remember when and where to add or subtract 32 degrees without thinking about it. The way I remember is that the freezing point of water is zero degrees C and 32 degrees F - and converting one to the other, the zero in each case has to be multiplied by the fraction. So F to C requires 32 to be subtracted before multiplying by 5/9, and C to F, the zero has to be multiplied by 9/5 before adding 32. Ian, G4ICV, AB2GR, K2 #4962 -- ___ 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 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
Re: [Elecraft] K3 Questions.& ..DVoice
Absolutely good points about the fail soft nature of analogue signals. While the new digital systems usually have a threshold, and fail hard, ie, the message does not get thru even partially, after a certain loss of signal point! This is why analogue ham communications get thru in disasters, and many Public Safety systems do not, as they depend more and more on go/ no go digital systems. -Stuart K5KVH retired fireman ___ 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
Re: [Elecraft] K2 Glitch on Field Day
Was the case exposed to sun heating during the operating period? A dark case, or any non reflective painted case, can develop quite a bit of heat from sun exposure even in mild weather. That coupled with high duty cycle of FD might have triggered the hi temp condition. Stuart K5KVH ___ 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
Re[2]: [Elecraft] K3 Questions.& ..DVoice
Stuart, what bandwidth do the Public Service people use on their digital systems? And let me ask you my earlier question: what happens on digital voice when you decrease the bandwidth on reception? Can you significantly improve signal-to-noise by narrowing the bandwidth (with only a loss of fidelity)? Or does digital voice have no tolerance for bandwidth reduction; that is, you need basically all of the bits in order to provide intelligible audio out. Mike W5FTD > Absolutely good points about the fail soft nature of analogue signals. > While the new digital systems usually have a threshold, and fail hard, ie, > the message does not get thru even partially, after a certain loss of signal > point! > This is why analogue ham communications get thru in disasters, and many > Public Safety systems do not, as they depend more and more on go/ no go > digital systems. > -Stuart > K5KVH > retired fireman ___ 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
Re: [Elecraft] K3 Questions
In the basics of digitizing the signal you have to clock the conversion at least twice the highest frequency you want to reproduce in the voice (or audio) signal. Now, you can sample a number of ways. You can use one sample per clock cycle, or you could do some of the phase shift techniques in encoding, taking multiple samples per cycle. (Quadrature sampling for example). Thus, if you narrow the band in which the digital signal is transmitting, you normally give up frequency response and intelligibility. Note the AOR open protocol system developed by the G -ham transmits into your audio input of a SSB radio, thus the bandwidth is no more than the SSB bandwidth, or at least that is what I got from an AOR ad. Another big issue with digital coding is duty cycle. It might not be within the finals power envelope to support digital modes other than CW or TTY; as TTY for example, continuously transmits a signal, and its information is varied by the shifting of the frequency, while the amplitude stays at a constant level. TTY has a high duty cycle compared to on off CW. In most rigs where you want to run PSK or TTY you back off the power to half of SSB. For PSK, it often is enough to do that, and still get the message for the variants of PSK that are error corrected. I think hams often want everything in one box, but don't want to pay the price that would require. There is no free lunch in RF engineering or other types. Until there is a world wide standard agreement on a digital modulation for voice for ham radio use, there is not much sense in marketing a unique system in the radio. In fact, the advantage of ham radio, is that it is mostly analog, and the signal can still be decoded, (heard) under conditions of fading, which is not true for digital methods that set a minimal SNR threshold to work. Thus in disaster, we can get a message thru when wide bandwidth, power hungry digital encoding fails. Most digital systems such as trunking radio, have single points of failure which are catastrophic. Ham communications are multi point to multi point, or redundant. IF one path fails, there is another station to station path that can work. The cost of sophisticated digital encoding such as Pactor III means that not many hams are going to have a spare packet modem box if the first one fails. However, you usually have several microphones that can work on a given radio at lower cost, if the first one fails. It is also easier to fix, as the failure modes are mostly mechanical, (connections) rather than a combination of electronic circuits and mechanical connections. -Stuart K5KVH ___ 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
Re: [Elecraft] K3 Questions
Guys, I'm finally getting around to asking a question about the K3 that will help a fellow ham decide whether or not he will be buying one; does it currently, or is it possible for a future firmware revision, for it to support voice feedback? My friend's reason for wanting to know is because his wife, who is also a licensed Amateur, is blind, and any HF Radio needs to be something she can use when he's not around to help her with it. Matthew Pitts N8OHU K2 #5956 ___ 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] [K2 4922] IF Amplifier Alignment
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Colleagues, I've moved on from the BFO issue (now resolved) to an IF alignment issue. My problem is a constant S3 reading on the S-meter. RF gain control works and is all the way turned up. Birdie at 6.999.17MHz is clearly readable but is only strong enough to push the S-meter up from S3 to S5. When I move off the birdie frequency I hear nothing on the headphones. Mode:CW Filter: FL2 RF gain: full AF gain: 12 o'clock Preamp: on The S-meter increases as the RF gain is decreased (as expected). As the constant reading masks the S-meter reading it is hard to peak the IF inductor L34 for maximum signal. Where to go from here? Thanks, Ron - -- - -=-o---=- Ron Hahn, EI2JP| Grid Square: IO62TG Rose Hill | Fists: 10883 Rosslare Strand| QRP-ARCI:12584 County Wexford, IRELAND| K2: 4922 __+__ -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.7 (Darwin) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFGgtP3yJCeYjZnfkQRArYMAJ4ybS19sZJFhHvqG80a/ZmavNRvjgCgmOIP pGISv6HI0RaYnFMapGCQQMg= =F8Uk -END PGP SIGNATURE- -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. ___ 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
Re: [Elecraft] K3 Questions
Matthew, This is covered well in the FAQ. But for a short answer, yes. Withe the optional DVR installed, a portion of the available space for recording is reserved for audio feedback for just such cases. I believe this is still being tested so I am not sure exactly which control items will give audio feedback, but certainly frequency and mode. Probably which XFIL is selected as well. I'm sure there's more, but I don't have the exact info yet. When a final list is available, I will post it on the FAQ page. Thanks. - 73, Greg - AB7R Whidbey Island WA NA-065 On Wed Jun 27 17:14 , "Matthew D. Pitts" sent: >Guys, > >I'm finally getting around to asking a question about the K3 that will help >a fellow ham decide whether or not he will be buying one; does it currently, >or is it possible for a future firmware revision, for it to support voice >feedback? My friend's reason for wanting to know is because his wife, who is >also a licensed Amateur, is blind, and any HF Radio needs to be something >she can use when he's not around to help her with it. > >Matthew Pitts >N8OHU >K2 #5956 > >___ >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 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
Re: [Elecraft] [K2 4922] IF Amplifier Alignment
Ron, Peak the IF amp inductor (L34) either by ear or by connecting an audio voltmeter (or DVM in AC mode) to the speaker connection (RF Board P5) to detect the maximum signal. Attempting to use the S-meter at this stage is not reliable. In any case, the peak is very broad. If you cannot discern a peak, set the slug 1 turn from the top of the can. You can (and should) re-adjust the S-meter menu settings CAL S Lo and CAL S Hi after you complete all other assembly and test items. 73, Don W3FPR Ron Hahn (EI2JP) wrote: I've moved on from the BFO issue (now resolved) to an IF alignment issue. My problem is a constant S3 reading on the S-meter. RF gain control works and is all the way turned up. Birdie at 6.999.17MHz is clearly readable but is only strong enough to push the S-meter up from S3 to S5. When I move off the birdie frequency I hear nothing on the headphones. Mode:CW Filter: FL2 RF gain: full AF gain: 12 o'clock Preamp: on The S-meter increases as the RF gain is decreased (as expected). As the constant reading masks the S-meter reading it is hard to peak the IF inductor L34 for maximum signal. ___ 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
Re: [Elecraft] K2 Glitch on Field Day
If anyone remembers their Physics 101 "Painted Tin Can" experiment - one painted light, and one painted dark - the K3 will naturally be an internally hot rig, on field days. In Physics 101 class - the can painted black - took on like 20% more internal heat, than did the can painted light. Heat reflectivity, and all that . Reason we wear white T-shirts, etc. Fred Moody friends. Drama queens. Your life? Nope! - their life, your story. Play Sims Stories at Yahoo! Games. http://sims.yahoo.com/ ___ 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
Re: [Elecraft] K2 Glitch on Field Day
In the same Physics 101 class they teach that black painted objects radiate heat better - one reason why the anode of a tube and also heatsinks are black. The black painted box of the K3 will dissipate the internally generated heat better. I personally preffer the grey color of the K2. To me it looks better and gives a unique look like no other radio. When I asked Wayne at Dayton about K3's color he said that he thinks black looks better and that's why KX1 is black as it is the K3. Anyway...I miss the gray look - maybe I can make a silk screen of the front panel and repaint the K3 once I get it in Grey. :-)) 73 AE1Z - Original Message - From: "Fred (FL)" <[EMAIL PROTECTED]> To: Sent: Wednesday, June 27, 2007 11:05 PM Subject: Re: [Elecraft] K2 Glitch on Field Day If anyone remembers their Physics 101 "Painted Tin Can" experiment - one painted light, and one painted dark - the K3 will naturally be an internally hot rig, on field days. In Physics 101 class - the can painted black - took on like 20% more internal heat, than did the can painted light. Heat reflectivity, and all that . Reason we wear white T-shirts, etc. Fred Moody friends. Drama queens. Your life? Nope! - their life, your story. Play Sims Stories at Yahoo! Games. http://sims.yahoo.com/ ___ 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 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
