[Elecraft] Simple spectrum analyser for SSB TX testing
For those who are eager to build something while waiting for the courier to bring your K3, you might like to try a simple spectrum analyser. In the best traditions of amateur radio this can be built in a few minutes using parts from your junk box. All that is required is a computer with sound card and a signal generator or at least a oscillator of sufficient level to feed a diode ring mixer. Details at http://www.astromag.co.uk/ssa/ Now you can check out your K2 with a two tone test! What do you think? 73 Dave G4AON K1 #1154, K2 #1892, K3... waiting... ___ 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 SSB TX Alignment Tools Proposal (was: New Product request ...)
Paul Pollock wrote: 2). A pad buffer (at the output of the dummy load) to be used to filter out/reduce the transmitter RF, and detect/output the audio. This is used as the input to a computer soundcard (for use with Spectrogram or other spectrum analyzer)) for transmitter bandwidth/BFO analysis. You would also need to tap the BFO, and include a mixer. However, are you aware that there is an, undocumented, IF loop back feature in the K2 firmware? If you key the transmitter in CAL FIL mode, at least for an SSB FL1 filter, the signal is looped back to the receive side, through the filter. This is true for the most recent firmware, as its undocumented, I don't know if it is in any older versions. I assume this uses the same loop back path as the carrier balance adjustment mode. -- David Woolley Emails are not formal business letters, whatever businesses may want. RFC1855 says there should be an address here, but, in a world of spam, that is no longer good advice, as archive address hiding may not work. ___ 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] Soldering Iron Temperature
Ian, I find that 700 degrees F is good for most of your pc board work. You mithe run it down to 600 degrees F for delicate components or plastic connectors. 800 degrees F is good for older tube equipment, terminal lugs, and power cables or coax (I always solder my Anderson Power Pole connector pins after crimping). 73, Dave KD1NA Hi guys, My Hakko 936 with several T-1 for surface mounted tiny components arrived today. It is not warm yet. I have been using an Antex 15 Watt iron since 1971, and I built my K2 #4962 with it. Now, variable temperature is, well, a variable that I have never had to consider. So, my questions: What temperature do you set with 60/40 solder on such as a K2, and perhaps a different temperature when soldering an AD9851? 73, Ian, G4ICV, AB2GR, K2 #4962, LP-100 #278 ___ 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] KPA100/KAT100 trouble
Chris, I am pleased to learn that you have had success with the diode replacement. They are a bit difficult to reach, and there is no reason they cannot be placed on the bottom of the board as you have done. Do correct the power supply situation before drawing any further conclusions about maximum power output, but you can calibrate the wattmeters even with your limited current battery. You can calibrate the wattmeter in the KPA100 and the KAT100 at 10 watts and that typically provides good results over the entire range. The KAT100 manual gives you voltage measurements to do that calibration and will normally yield quite acceptable calibration results - just follow the manual instructions. Actually doing the KPA100 wattmeter calibration at 10 watts will provide good accuracy over the entire range too (there is scaling at high power built into the KPA100). Power only the base K2 and the power control steps will provide more resolution during the calibration, and if you have an accurate dummy load, you can read the RF voltage across the dummy load with an RF Probe and calculate the actual power. The K2 LED bargraph does not have sufficient resolution to measure the actual power output - if you have the Elecraft DL1, you can use it with the built-in detector to determine the actual power, but lacking that tool, use an RF Probe and a good 50 ohm non-reactive dummy load to calculate the power - most RF Probes will withstand RF voltages across a 50 ohm load for up to about 18 watts. 73, Don W3FPR Christopher A. Kantarjiev wrote: Don, It's taken me several weeks to get to this, but tonight was the night. I had tested and determined that the base K2 was fine, but neither the KPA nor KAT controlled power correctly. The parts folks had sent me diodes. Boy, what a nuisance these are to replace! Julius N2WN had suggested putting the KPA's diodes on the underside of the board, where they are easier to get at, and I followed that advice. For the KAT, there's just no good way to get at the backside of the board w/o removing all the connectors. I used a stainless dental pick to clean out the holes from the front, and soldered from that side, too. Power control works great now. Both bridges seem to want to be recalibrated - the max output is about 75W, even when I have 100+ dialed in. I didn't do the original calibration on these, so I'm not certain of how close they were ... and I guess I'm not sure that I measured for full power out when I bought them. ___ 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] Simple spectrum analyser for SSB TX testing
Dave, Yes, such a 'block converter' (mixer) to convert the transmitted output to baseband is a great tool. If I may, let me add some alternatives. Some Elecraft builders already have some of the pieces required for this Spectrum Analyzer and may not realize it. The spectral display can be most any of the audio spectrum analyzers that are available. Many Elecraft builders already are familiar with Spectrogram which will also do the task nicely. The dynamic range is limited by the soundcard, but even with only 60 dB of dynamic range, useful information can be obtained. The Elecraft mini-modules can be used for several of the pieces. In place of the 40 dB tap - a CP1 can provide either a 20 or 30 dB (depending on how it was constructed) coupling at its forward port (be certain to terminate the reverse port). The Elecraft attenuator can be used between the coupler forward port to provide additional attenuation and prevent overdriving the mixer. Also the 2T-GEN can be used to provide the 2 tone output if your computer soundcard does not do full duplex. The signal generator should provide a +7 dBm to the mixer LO port for optimum performance (any attenuation built into the mixer will require a greater level). The Elecraft XG1 or XG2 generators do not have enough output (50 uV is only -73 dBm) - but a QRP transmitter can be pressed into service for that purpose - only about 5 or 6 mW is required (do not overdrive the mixer), so the power from most transmitters must be reduced - a 2nd Elecraft attenuator mini-module will do that job. Yes, you can test the SSB spectrum while tuned to the CW bands since everything is running into a dummy load - just don' try it with an antenna if you value your license! Bottom line, most everything to do this task except the mixer and signal generator is available in the Elecraft mini-module line. You did not publish a schematic of the mixer, although you described it well in the text. There is a similar mixer module shown in Experimental Methods in RF Design page 7.35 for those who have that publication. 73, Don W3FPR Dave G4AON wrote: For those who are eager to build something while waiting for the courier to bring your K3, you might like to try a simple spectrum analyser. In the best traditions of amateur radio this can be built in a few minutes using parts from your junk box. All that is required is a computer with sound card and a signal generator or at least a oscillator of sufficient level to feed a diode ring mixer. Details at http://www.astromag.co.uk/ssa/ Now you can check out your K2 with a two tone test! What do you think? 73 Dave G4AON K1 #1154, K2 #1892, K3... waiting... ___ 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
[Elecraft] K2: Using PC Microphone - How To.
As it might be immediately obvious, you can use non-USB PC microphones with the K2 by using a straight through microphone jumper block and a stereo line socket with pin 1 on the microphone connector connected to the tip connection, pin 8 connected to the barrel and pin 6 connected to the ring, through a resistor (5k6 seems good). (The Elecraft configuration, with the ring unconnected, should also work for most, i.e. electret ones.) The PC microphone logic seems to be that electret microphones have ring and tip connected together in the plug, so the resistor provides the load and pull up for the internal pre-amplifier, and dynamic ones use a mono jack, which shorts the resistor to ground. Using the pure Elecraft configuration will put a DC bias on the dynamic microphone, which might not be good for it. (I suppose there could be microphones that use the ring but don't connect it to tip.) As always, electret microphones are preferred, as dynamic ones have rather a low output level. Obviously, you have to use them VOX, or use the key input for the PTT function. You could wire a separate switch on the microphone connector. I haven't evaluated the RF tolerance of PC microphones, yet. Incidentally, I was surprised to find that the shell on the microphone connector is floating, although I was aware of a mod for better grounding, although that is old and says that better support for grounding is planned. -- David Woolley Emails are not formal business letters, whatever businesses may want. RFC1855 says there should be an address here, but, in a world of spam, that is no longer good advice, as archive address hiding may not work. ___ 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] Simple spectrum analyser for SSB TX testing
Don I've added a diagram! Thanks for your thoughts. I would prefer a real two tone test oscillator to the one from the sound card... 73 Dave G4AON ___ 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] KX1 power on problem
Mike, The first thing that usually comes up is the "standard" answer of making sure all the solder joints are solid. Sometimes, just reheating them will make the difference. It's possible that you do have some sort of component failure, but I wouldn't expect it to be intermittent. That is, most of the time something fails, it's dead. If you are unfortunate enough to have a part that is static damaged, this sort of behavior is possible (referring to the memory loss). I'm not sure I'd be thinking filter cap (particularly if the noise is 60 cycle) since you get the same thing on battery. Anyway, that's just a few quick thoughts. Hope it helps. Let us know what you find. Regards, kurtt Kurt Pawlikowski, AKA WB9FMC The Pinrod Corporation [EMAIL PROTECTED] (773) 284-9500 http://pinrod.com Mike Scott wrote: My 3-band KX1 does not always come fully on when I hit the power switch. I am plugged into external 14 VDC power. I also have the same symptoms on battery power. Symptoms are as follows: Log lamp always works Sometimes power comes on normally with the frequency shown in the display and band noise and signals in the headphones. Sometimes when I turn it on I hear noise, but not band noise and the display remains dark. The noise right now is accompanied with a start up buzz that fades to white noise with a dark display. After a lot of power cycling when I am trouble shooting the KX1 starts up every time and the start up buzz goes away and the display works. One more symptom that is odd, I just used recall memory to tune to 7.040 MHz. I then cycled the power. The radio came up on 6.0691 MHz, it forgot the last frequency used. No matter what the prior frequency is the radio comes up at the following frequencies: 40M - 6.0691 30M - 10.1068 20M - 14.0054 The buzzing noise makes me think an electrolytic is going somewhere. I am not sure where to start, anyone have a pointer? Mike Scott - AE6WA Tarzana, CA (DM04 / near LA) QRP-ARCI #12326/ KX1 #1311/ Swan 350C ___ 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] Soldering Iron Temperature
The answer is in how fast the solder flows on the joint. With most good irons and tips appropriate to the size of the solder joint, 700F to 750F is typical. Once you put the iron to the joint, solder should flow freely in about 3 seconds, not much longer. Dwell times (time the iron is on the joint) greater than 5 seconds means you don't have enough heat, no matter what the iron temperature says. One can produce a FB solder joint even if the iron has to be on the joint much longer, but you're in serious danger of damaging components or de-bonding traces from the pc board. It isn't the temperature that destroys the components so much as it is the length of time they are kept hot. It's much easier on most components to be subjected to higher temperatures for a short period of time than to be subjected to 100 degrees less for a longer time. So a "hotter" iron is a safer iron around sensitive components. Some builders like to keep their irons below 700F. That's fine IF they get enough heat fast enough to flow solder in 3 seconds or so, but, in addition to damaging components, cooler irons are one of the most common reasons for poor, "cold" solder joints in which the solder covers the pad and leads, but doesn't actually bond to them, leaving a mechanical connection that will oxidize and become intermittent over time. Cold solder joints used to be easy to spot because they had a satin sheen to the solder when it cooled. Unfortunately, the new solder formulations that reduce or eliminate lead may produce that sheen even when soldered correctly. That means proper technique is more important than ever to produce safe, reliable solder connections. If you have to use iron temperature settings above 750F to keep the dwell time down to about 3 seconds for pc board work, look at the tip you're using. Tips aren't terribly critical, but a tiny tip on a relatively big joint simply won't transfer heat fast enough. Also, make sure you're using a wet tip with a tiny film of solder that greatly helps heat transfer. I generally touch the wire solder to the joint and set the iron on the edge of the solder so it melts a tiny bit of the end on contact. That provides the transfer medium. On most pc boards, melting off 0.5 mm or less of very thin wire solder is plenty to provide good thermal contact. That's where using appropriate size solder comes in too. Very fine solder is needed to work easily on small pads. Another place to pay attention is the condition of your iron. Every few years I disassemble my Hakko 936 to clean out any black oxidation that is accumulating between the heating element and the tip. The Hakko has a wonderful tip heater that really pour on the calories to keep the tip hot. You don't have to worry about tip "temperature droop" with it unless perhaps you're using it on a production line soldering SO-239 coaxial connector shells . But it needs to move that heat from the heater to the tip efficiently, and to do that it needs to be clean inside as well as outside. Ron AC7AC Hi guys, My Hakko 936 with several T-1 for surface mounted tiny components arrived today. It is not warm yet. I have been using an Antex 15 Watt iron since 1971, and I built my K2 #4962 with it. Now, variable temperature is, well, a variable that I have never had to consider. So, my questions: What temperature do you set with 60/40 solder on such as a K2, and perhaps a different temperature when soldering an AD9851? 73, Ian, G4ICV, AB2GR, K2 #4962, LP-100 #278 ___ ___ 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] next K3 communication/update due today
The Aptos crew indicated that we'd get weekly communications (updates) about the K3. Last update I saw was on the last day of last week (Sept 29). Guess we're due for another update today! :-) de Doug KR2Q ___ 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] OT - Heath CW Twins
Hello David, Chuck Penson's excellent book, HEATHKIT: A GUIDE TO THE AMATEUR RADIO PRODUCTS, 2nd Ed., lists both the HR-1680 and the HX-1681. According to Chuck, the HR-1680 was released in the Fall of 1967, but the HX-1681, which initially was advertised as "coming soon," was plagued with problems and not released until the summer of 1979. Continuing Chuck's comments, early HX-1681s had key-click problems, and Heath provided a free modification to owners to remedy this. This modification was included in later-production HX-1681s. A modification to solve the key- click appeared in the March, 1981, QST. Eventually the HX-1681 was pulled from production a year earlier than the HR-1680. Chuck further says that, the both the HR-1680 and the HX-1681 use plug-in circuit cards, and the card-edge connectors are subject to oxidation over time. These connector contacts may need periodic cleaning. Overall, Chuck Penson has kinder things to say about the HR-1680 than he does about the HX-1681. I hope this is helpful 73, John, no8v ___ 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] Re: [N1MM] Elecraft K3 with N1MM
Folks: This is a response to a message posted on the N1MM Logger reflector, but since it's K3-related, I'm posting to Elecraft as well... At 07:30 10/06/2007, lu_w4lt wrote: Anyone using an Elecraft K3 with the software? Any issues or praise? I am considering a station upgrade. Thanks in advance Lu - W4LT At 10:29 AM 10/6/2007, Jim Denneny wrote: Since factory has not shipped K3 yet, answer is no (other than a few beta testers). Jim K7EG Up until about 5-6 days ago, the K3 was not able to communicate with N1MM in BOTH directions... it could RECEIVE (and act upon) commands from N1MM, but N1MM was not able to get info FROM the K3. That's all changed now, and I'm helping test N1MM LOGGER on the K3 and so far it's working quite well. NO KNOWN STUMBLING (SIGNIFICANT) BLOCKS SO FAR SINCE THE COMMS PROBLEM HAS BEEN ELIMINATED...! N1MM may not have FULL K3 functionality installed quite yet. K3CT is working with Elecraft and the FTs to get all the functionality installed, but this takes time. I have full faith in John's abilities however. I'm hoping to try N1MM Logger a bit later today in the Cal QSO Party and then again next weekend in another 'activity' as well. Will report if I find ANY show stoppers. 73, Tom Hammond N0SS K3 Field Tester ___ 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] re: next K3 communication/update due today
Well it seems that the second batch is due to start shipping 8th November. The third batch 'late December' according to the shipping status page. I'm in the third batch so i'm not concerned about there not being a solid date at the moment. Mark M5MDH ___ 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 "status" update is not the same as "when will it ship"
Fellow K3 droolers Seems that every time I post a friendly reminder (actually more like when my anxiousness becomes extreme) about the "weekly communication" promised by the Aptos crew, I get a bunch of private emails (and some not private) giving me the last "shipping" update as posted on the Elecraft page. I am looking forward to the weekly COMMUNICATION, irrespective of whether or not it updates the shipping date of run 1, 2, 3, 4n. I want to hear about "what is happening" inside Elecraft in terms of stuff K3-relatedany updates. More Communication is what was promised; I take that to mean more than merely the next targeted shipping date. So thanks for the "week of Nov 8" info, which I already knew since I too read Eric's last post, but that's not the only thing that I am looking forward to. de Doug KR2Q ___ 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] Comparison: K3 and SDR 5000A
I would like to hear from my fellow Elecraft fans regarding general impressions of the K3 versus the SDR 5000A, software defined radio. Just as in the Elecraft reflector, FlexRadio has some very stout supporters. I hope this topic is not inappropriate. Just interesting. John AB8O ___ 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] Comparison: K3 and SDR 5000A
Hi John, Although I do not have a 5000, I do have a SDR-1000. Elecraft and Flex are both Good companies that produce great radios. However, I believe one major difference between the K3 and the Flex 5000 will be in wider space dynamic range. The close-in 2Khz dynamic range for the 5000 I believe was measured by Rob Sherwood at 96db which is a good number. But the 5000 does not have roofing filters, so if I am not mistaken, the 96db IMD dynamic range will the same at 2Khz, 5Khz, 10Khz, 20Khz, and beyond, as it is with most sound card based SDR's. To me a 96db Dynamic range beyond 20Khz is not good. I believe that a 96DB dynamic range is around 40-45db over S9, so if my calculations are correct, IMD could be a problem from a 45db over S9 signal 20Khz or more away. That is one of the reason's why I chose the K3 over the 5000. The K3's close in numbers will be around the same is the 5000, but the wider spaced measurements I expect to be much better then the Flex-5000. John, KD8K ___ 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] KX1 power on problem
Mike, In addition to checking soldering joints, double check carefully components on the board with the manual. Yeah, I know, it's a pain but the only thing you can do. Also check the battery plug on the board. I had a problem with the type of wire they chose, as it would break easily if you took it in and out of the case too much. Bob N4BGR > From: [EMAIL PROTECTED] > To: Elecraft@mailman.qth.net > Date: Fri, 5 Oct 2007 13:31:09 -0700 > CC: > Subject: [Elecraft] KX1 power on problem > > My 3-band KX1 does not always come fully on when I hit the power switch. > > I am plugged into external 14 VDC power. I also have the same symptoms on > battery power. > > Symptoms are as follows: > > Log lamp always works > > Sometimes power comes on normally with the frequency shown in the display > and band noise and signals in the headphones. > > Sometimes when I turn it on I hear noise, but not band noise and the display > remains dark. The noise right now is accompanied with a start up buzz that > fades to white noise with a dark display. > > After a lot of power cycling when I am trouble shooting the KX1 starts up > every time and the start up buzz goes away and the display works. > > One more symptom that is odd, I just used recall memory to tune to 7.040 > MHz. I then cycled the power. The radio came up on 6.0691 MHz, it forgot the > last frequency used. > > No matter what the prior frequency is the radio comes up at the following > frequencies: > 40M - 6.0691 > 30M - 10.1068 > 20M - 14.0054 > > The buzzing noise makes me think an electrolytic is going somewhere. > > I am not sure where to start, anyone have a pointer? > > Mike Scott - AE6WA > Tarzana, CA (DM04 / near LA) > QRP-ARCI #12326/ KX1 #1311/ Swan 350C > > > ___ > 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 _ Boo! Scare away worms, viruses and so much more! Try Windows Live OneCare! http://onecare.live.com/standard/en-us/purchase/trial.aspx?s_cid=wl_hotmailnews___ 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] Comparison: K3 and SDR 5000A
AB8O:
>I would like to hear from my fellow Elecraft fans regarding general
impressions of the K3 versus the SDR 5000A, software defined radio.
Good question John...unlikely it can be answered
completely until after the K3 ships. I've also been following
the 5000, and here are some strictly *academic* thoughts based
on published info:
RX Performance (2 kHz spacing, 500 Hz filter):
Metric K3 5000Advantage Sources
IMDDR3 94 96 neutral Eric/Sherwood
BDR 138 123 K3
Eric/Sherwood
Note: Sherwood published data for 5 kHz only but the 5000
should have identical IMD/BDR performance at 2 kHz.
Phase Noise:
Rig 1kHz2 10 20 50 100 1M
K3 -110 -119 -136 -140 -143 -144 -150
5000 -123(flat)*
*(Sherwood) "Phase noise does not fall off at 6 dB per octave as expected.
Flex believes the present phase noise limitations are caused by A/D
clock jitter". ("Clock jitter" is another word for phase noise).
Advantage K3. It has lower integrated phase noise
over the entire spectrum. The 5000's relatively higher
phase noise will likely be an issue, especially for
VHF users.
Form Factor:
This is a religious issue with some. Knobs versus
no knobs. "Real Radios Don't Need Knobs" (Flex's slogan).
I suppose the K3's corollary slogan is "Real Radios Don't
Need Computers". :-)
Cost (for the 5000 it depends on whether you already have
a fairly high-performance computer dedicated to your shack.
I'm going to compare the 5000C which includes the computer
and will assume $200 for an LCD display):
5000C $5098 (no ATU, $200 display plus a $99 knob option)
K3$2825 (assembled K3/100, KXV3, KRX3, 2X 500 Hz filters)
Of course the K3 does not include a bandscope, but the KXV3
provides the wide bandwidth buffered IF output to do this.
Eventually Elecraft, Clifton Labs or someone will provide
this. The solution could be as simple as a SoftRock40 on
the 8.215 MHz output to something much more exotic. Let's
assume $400 for something like a Clifton Labs Z91 plus
another $600 for an adequate computer and display, resulting
in an additional $1000 for interface hardware, computer and
display. I'm assuming free software based either on Rocky
or PowerSDR. This results in:
5000C $5098
K3+ $3825
Advantage: K3 which will have basic RX performance
exceeding the 5000 (see above) and a parallel SDR bandscope.
Assuming someone like HB9DRV integrates this with his Ham
Radio Deluxe program, I believe the K3 will maintain a
significant price advantage over the 5000C.
Portability:
Metric: K3 5000C
Dimensions: 4X10X10"8.72X17.67X14.67"
Cubic inches: 400 2260
Weight: 8 lbs. 13 lbs.
Power: Similar...I'm tired of typing!
Advantage: K3. I suspect it will very quickly become a
gold standard for DXpeditions, not to mention contesting.
Let's remember that neither of these rigs is
a finished product and both will likely be upgraded via
firmware/software as they evolve. Both have very good
designers and very good mechanisms in place for customer
feedback, so any weakness today may be solved tomorrow.
I also think there's simply a different mindset
appeal of both rigs. Some of us enjoy tinkering with
computers, software, etc and those will love the 5000C.
Some of us are more into ergonomics, operating, etc
and those may like the K3 better (IMHO). Time will tell.
73, Bill W4ZV
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Re: [Elecraft] OT - Heath CW Twins
In a message dated 10/6/07 12:07:38 PM Eastern Daylight Time, [EMAIL PROTECTED] writes: > According to > Chuck, the HR-1680 was released in the Fall of 1967, I think he meant "fall of 1976". The first advertisement for the HR-1680 that I could find was QST for October, 1976. The ARRL Product Review came out in January 1977. 1967 was the year of the HW-100 and soon after the HW-16. Much too early for the all-solid-state HR-1680. The Product Review says the VFO stability deserves special note, as it was measured as under 75 Hz from cold start to stabilization, and less than 20 Hz per hour after that. Using the SSB-bandwidth filter (CW selectivity is provided by an active audio filter), the rx noise floor was measured as -137 dBm, BDR of 108 dB, and IMD two-tone IMD as 82 dB. The review notes some of the corners that were cut to keep the price down ($200 range). The RF circuits are diode switched, the IF xtal lattice filter is only 4 poles and made of discrete components rather than packaged, and the builder assembles the VFO. Only the first 1 MHz of 10 meters is covered, and there is no provision for more band xtals nor other IF filters. Since the receiver predates WARC-79 by several years, there's no 30, 17 or 12 meter coverage. The HR-1680 seems to me to have been meant as a replacement for the HR-10, but with much better performance and features. But at over $200 for the kit, I don't recall it being a big seller. If you wanted a hamband receiver, a used Drake 2B could be had for about that price or less, and offered a lot more features. The HW-101 transceiver cost only about $100 more than the HR-1680, and needed a power supply, but the '101 was a full-scale 100-watt class CW/SSB transceiver, covered all of 10 meters, and could be set up with the optional CW IF filter. 73 de Jim, N2EY ** See what's new at http://www.aol.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] Comparison: K3 and SDR 5000A
KD8K: >The K3's close in numbers will be around the same is the 5000, but the wider spaced measurements I expect to be much better then the Flex-5000. John you are correct that the 5000 will have constant IMD and BDR over the entire range of spacings. But IMD does not appear to be *significantly* different (I define significantly as >6 dB). Quoting Eric: Filter20kHz 10kHz 5kHz 2kHz 200 Hz, 5 pole100+ 100+ 100+ 95 250 Hz, 8 pole100+ 100+ 100+ 95 400 Hz, 8 pole100+ 100+ 100+ 95 500 Hz, 5 pole100+ 100+ 100+ 94 1 kHz, 8 pole 100+ 100+ 10094 2.7 kHz, 5 pole 100+ 98 92n/a 2.8 kHz, 8 pole 100+ 100 93n/a ...versus 96 dB for the 5000 at all spacings. In my opinion, BDR is a much more significant issue. The 5000 will be flat at 123 dB for all spacings versus the K3 at: "For the particular K3 I tested the phase noise on below, I measured a typical BDR of 140-141dB at spacings 5 kHz and wider and about 138dB at 2 kHz." (again quoting Eric) ~20 dB difference in BDR and/or Phase Noise (from my previous post) will be very noticeable in the following situations: 1. During multi-transmitter operations (multiop or SO2R in contests, Field Day, expeditions, etc). 2. If you have a very close neighbor (either a ham or a powerful broadcast station). So I agree with your comments in general, but I feel they apply more to BDR and Phase Noise than IMD. 73, Bill W4ZV P.S. And let's all not forget that there could be some differences in what Elecraft measures versus others! ___ 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] KX1
Thank you for the replies on my KX1 power on issues. Don Wilhelm has me going in a good trouble shooting direction. I will post resolution after I finish the process. The issue of the KX1 not remembering my last frequency was an operator error, one needs to be on a frequency for 30-seconds before the KX1 commits a frequency to memory. Duh, a real tail chase! This is a good diversion from K3 want-itis. Mike Scott - AE6WA Tarzana, CA (DM04 / near LA) QRP-ARCI #12326/ KX1 #1311/ Swan 350C ___ 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] Comparison: K3 and SDR 5000A
Bill Tippett wrote: So I agree with your comments in general, but I feel they apply more to BDR and Phase Noise than IMD. Hi Bill, Yes you are correct on that. For some reason I got the BDR and IMD numbers mixed up. However, I do believe that one of the FAQ's mentioned a 20KHZ dynamic range greater then 104db. That's still pretty good :) 73, 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] Comparison: K3 and SDR 5000A
Hello Bill! A few additional things to note: WHAT THE ADC CONTENDS WITH 1a) In the K3 architecture, the 24-bit analog to digital converter (ADC) is exposed only to signals that make it through the roofing filter. This is typically less than a 3 kHz slice of spectrum, and may only be a couple hundred Hz. 2a) In a quadrature sampling detector (or integrating sampling detector) architecture, used by the SDR-1000/5000 series, the ADC is exposed to all the signals in the detector passband, typically more than 200 kHz wide even if the displayed passband is less. SYNTHESIZER CONSIDERATIONS ARE ABOUT MORE THAN JUST PHASE NOISE 1b) In the K3, the synthesizer generates a single, clean signal for mixer injection. Subsequent oscillators/mixers (including the software oscillators inside the DSP) are only dealing with band-limited signals due to the roofing filter. 2b) In the typical QSD/ISD system, a quadrature signal is generated by a DDS. DDSes can have very low phase noise, but typically have numerous spurs. While mitigation techniques exist, the fact remains that there are usually several spurs only 70 or 80 dB down inside a given 200 kHz wide passband. These spurs can mix with other signals. IT TAKES TIME TO PROCESS SIGNALS 3a) Radios based on embedded DSP, like the K3, can take advantage of processing techniques on a sample-by-sample basis. This may translate to reduced latency (the time it takes for a signal at the antenna to appear in the speaker or headphones). 3b) Receivers relying on PCs for DSP deal with data in blocks, rather than sample-by-sample. This results in significant latency - often 100 to 200 milliseconds or even more -- regardless of the speed of the PC's CPU! I hooked up an SDR-14 (using a dual core 3 GHz PC in block mode processing for its DSP) to the IF output of my K3 (which uses sample-by-sample processing in its embedded DSP) and listened to the same signal. The audio from the SDR-14 appeared in the speakers *much* later than the audio from the K3. In some cases, this may not be important. In other cases (QSK CW comes to mind), latency can be very important. Enjoy! Lyle KK7P ___ 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] Re: Comparison: K3 and SDR 5000A
Lyle Johnson wrote: 2b) In the typical QSD/ISD system, a quadrature signal is generated by a DDS. DDSes can have very low phase noise, but typically have numerous spurs. While mitigation techniques exist, the fact remains that there are usually several spurs only 70 or 80 dB down inside a given 200 kHz wide passband. These spurs can mix with other signals. Just a quick follow-up to Lyle's posting. The K3's synthesizer uses a DDS, too, but it's almost completely isolated from the signal path, in two ways. First, it is followed by a very narrow 4-pole crystal filter (about 2.5 kHz wide), which removes harmonics as well as both narrowband spurs (over a carefully selected tuning range) and wideband Nyquist sampling spurs. Second, the DDS drives a PLL and very low-noise VCO. The VCO has a high C-to-L ratio, and very little of the capacitance is represented by the varactor diodes. This is accomplished by breaking the VCO tuning range into 128 bands. All of the above makes life difficult for your MCU firmware guy, but the result is a *very* clean signal. And this code was finished a long time ago:) 73, Wayne N6KR --- 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] Re: [N1MM] Elecraft K3 with N1MM
Any news regarding Writelog? Jay - KT5E I have full faith in John's abilities however. I'm hoping to try N1MM Logger a bit later today in the Cal QSO Party and then again next weekend in another 'activity' as well. Will report if I find ANY show stoppers. 73, Tom Hammond N0SS K3 Field Tester ___ 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: Have any FT tried WinTest out yet?
In the Bavarian Contest Club and in much of the EU WinTest has become very popular for contest logging. Do any of the field testers have experience with WinTest and the K3 yet? vy 73 de toby -- DD5FZ (ex 4n6fz, dj7mgq, dg5mgq, dd5fz) K2 #885 K2/100 #3248 K3 #??? (<200) DOK C12, BCC, DL-QRP-AG ___ 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] Comparison: K3 and SDR 5000A
I sold my SDR1k due to the spur issues. I loved the radio, mostly. The panadaptor I really miss. My Icoms scope is nowhere as flexible and slick. I don't have any issues with BDR, IMD as I live in the country with no competition. If the bands ever open back up and I get some real activity I may see minor issues. I have not owned a K2 but have found virtually no one who doesn't like it that owns one or has owned one. Hardly ever see one for sale. I was going to buy a 5000. Then the K3 came out. (Almost). Now I am watching and waiting. If the specs and performance is as good as it seems, and a panadaptor becomes available that rivals the Flex, I'll the buy a K3. If not I'll be leaning toward a 5000. I would prefer to see the pana, if one comes out, feed into the audio card in my pc after the appropriate mixing etc. I do not want a standalone DMU ala Ft2000 A waste of time and money. It would be ok for contesters I guess. But for my application the pc based pana would be preferred. That way I could window the sweep. The future looks bright for both companies. And the ham community. Randy W8RAN ___ 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] Re: Comparison: K3 and SDR 5000A
N6KR: >Just a quick follow-up to Lyle's posting. You guys are simply awesome! Now get my K3 shipped! :-) 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
RE: [Elecraft] K3: Have any FT tried WinTest out yet?
I have an older version of WT (2.28). It does not have any Elecraft support options. That said, the Kenwood protocol seems to work with band changes. But changing mode on the K3 does not seem to pick up in WT. I don't know what changes they've made since this older version. 73 Greg AB7R -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Toby Deinhardt Sent: Saturday, October 06, 2007 3:56 PM To: elecraft@mailman.qth.net Subject: [Elecraft] K3: Have any FT tried WinTest out yet? In the Bavarian Contest Club and in much of the EU WinTest has become very popular for contest logging. Do any of the field testers have experience with WinTest and the K3 yet? vy 73 de toby -- DD5FZ (ex 4n6fz, dj7mgq, dg5mgq, dd5fz) K2 #885 K2/100 #3248 K3 #??? (<200) DOK C12, BCC, DL-QRP-AG ___ 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 No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.5.488 / Virus Database: 269.14.2/1053 - Release Date: 10/6/2007 10:18 AM No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.488 / Virus Database: 269.14.2/1053 - Release Date: 10/6/2007 10:18 AM ___ 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] OT - Heath CW Twins
Jim, N2EY, is correct; the 1967 is a typo on my part. Chuck Penson states that the HR-1680 was released in the Fall of 1976. Original message Date: Sat, 6 Oct 2007 15:54:32 EDT From: [EMAIL PROTECTED] Subject: Re: [Elecraft] OT - Heath CW Twins To: [EMAIL PROTECTED], [EMAIL PROTECTED], elecraft@mailman.qth.net In a message dated 10/6/07 12:07:38 PM Eastern Daylight Time, [EMAIL PROTECTED] writes: >According to Chuck, the HR-1680 was released in the Fall of 1967, I think he meant "fall of 1976".73, John, no8v ___ 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: Have any FT tried WinTest out yet?
> But changing mode on the K3 does not seem to pick up in WT. That's interesting to hear. All versions of WinTest I've used in the last 2 or 3 years, have worked nicely in Kenwood mode with my K2. Wonder what the difference is? vy 73 de toby -- DD5FZ (ex 4n6fz, dj7mgq, dg5mgq, dd5fz) K2 #885 K2/100 #3248 K3 #??? (<200) DOK C12, BCC, DL-QRP-AG ___ 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] Comparison: K3 and SDR 5000A
> 2a) In a quadrature sampling detector (or integrating sampling > detector) architecture, used by the SDR-1000/5000 series, the > ADC is exposed to all the signals in the detector passband, > typically more than 200 kHz wide even if the displayed passband > is less. This is key in relation to IMDDR (mixing and spurious generation). Any signal handling circuits must be able to handle the total peak power of all signals within that 20) KHz window ... not just the average power. If the amplifiers/mixers cannot handle the "sum of the peaks," there is a real chance that signals well off frequency will generate IMD products on the operating frequency and the IMDDR measured by a two tone process (Sherwood, ARRL, etc.) will be significantly optimistic with a receiver design like the SDR-1000/FLEX-5000 as it only measures third order (2F1-F2, 2F2-F1) products and fails to consider fifth and higher order products that result from three, four and more strong interfering signals. This is a major issue on 160 meters where there may be several strong AM broadcast signals just below the band or on 40 meters (particularly in Europe) with multiple strong broadcasters IN the band. It's also an issue on 80/75 meters where there can be multiple VERY STRONG "local" signals within 50 - 100 KHz of the operating frequency. With a "roofing filter" design, mixers and amplifiers (other than a preamplifier) need to contend with strong signals only within +/- 2.5 KHz (2.7 x 1.6 / 2). The number of potentially interfering signals are reduced significantly with the roofing filter design. 73, ... Joe, W4TV ___ 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] re: K3 "status" update is not the same as "when will it ship"
I'll keep my mouth shut in future. Mark M5MDH ___ 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 problem with 4 MHZ calibration
K2 Problem (serial No. 4159) Hello dear builders...I have a problem. At the 4 Mhz Oscillator calibration a problem occurred: First the counter did not show 12090 +/- 30 KHz but: ~ 8.9 MHz I checked the board and discovered that I had made a mistake with D16; then I soldered D16 in the correct way and the measurement now is around 7,5 MHz (with built-in frequency counter) - verified all components and their polarity, all seems ok (yes - X1 is the 12,09 MHz oscillator) I verified the frequency of the oscillator with the help of my FT-1000MP and yes, around 7.562 KHZ you can hear the oscillation... by the way: the VCO Test is OK a friend who has successfully built a K2 thinks perhaps the 12.09 MHz oscillator is faulty... what do you think...so far the building was fun and successful...but now i do not know what to do.. THANK YOU VERY MUCH for your help Very 73 de Markus, DL9RCF No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.488 / Virus Database: 269.14.3/1054 - Release Date: 10/6/2007 7:12 PM ___ 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] KSB2 OP1 filter USB response...
It has been a few weeks since I built the KSB2 option. There is one problem I haven't yet resolved. The response on the USB side of OP1 is not as broad as the LSB side, and has a narrower peak. I didn't pay much attention to this before. I've never transmitted in USB except for the digital modes using RTTY reverse. I'm not much of a SSB guy. These observations were made with the Spectrogram software. The symptoms are quite noticeable by listening also. 73, Steve N6VL K2 #2289 ___ 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 problem with 4 MHZ calibration
Markus, For now you do not know if the problem is with the counter or with the PLL. Is your friend close enough that you might be able to borrow his K2 control board (and his internal counter probe) for a quick test? If so, then substitute the known working control board for yours and measure the PLL frequency. If it still indicates a frequency in the 7.5 MHz range, then you have a problem with the PLL circuit, but if it indicates a correct range for the PLL, then you have a counter problem. Do not make any menu settings with the substitute Control Board because the settings will be written into your friends EEPROM - restrict the testing to the counter indication. In either case, check the soldering carefully. Most failures are caused by improper solder connections. 73, Don W3FPR Mike Scott wrote: K2 Problem (serial No. 4159) Hello dear builders...I have a problem. At the 4 Mhz Oscillator calibration a problem occurred: First the counter did not show 12090 +/- 30 KHz but: ~ 8.9 MHz I checked the board and discovered that I had made a mistake with D16; then I soldered D16 in the correct way and the measurement now is around 7,5 MHz (with built-in frequency counter) - verified all components and their polarity, all seems ok (yes - X1 is the 12,09 MHz oscillator) I verified the frequency of the oscillator with the help of my FT-1000MP and yes, around 7.562 KHZ you can hear the oscillation... by the way: the VCO Test is OK a friend who has successfully built a K2 thinks perhaps the 12.09 MHz oscillator is faulty... what do you think...so far the building was fun and successful...but now i do not know what to do.. THANK YOU VERY MUCH for your help Very 73 de Markus, DL9RCF ___ 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] KSB2 OP1 filter USB response...
Steve, Tell us more. The SSB OP1 filter as observed with Spectrogram in LSB or USB should show a relatively flat passband extending from about 300 Hz to 2600 Hz. I do not understand 'peak' in that context. It may be that your BFO frequencies are not adjusted properly, but your use of the 'peak' term causes some doubt about what you are observing. Can you be more specific and descriptive? 73, Don W3FPR Steve Kallal wrote: It has been a few weeks since I built the KSB2 option. There is one problem I haven't yet resolved. The response on the USB side of OP1 is not as broad as the LSB side, and has a narrower peak. I didn't pay much attention to this before. I've never transmitted in USB except for the digital modes using RTTY reverse. I'm not much of a SSB guy. These observations were made with the Spectrogram software. The symptoms are quite noticeable by listening also. 73, Steve N6VL K2 #2289 ___ 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] Elecraft CW Net Announcement
Good Evening to You All, Weather has switched here in Oregon, it is now coming straight out of the Gulf of Alaska. It is very chilly and very wet. Good thing I have plenty of wood in the stove and next to it. Sam is happy indeed roasting next to the fire. I must remember to turn him soon so he does not melt! This week I was able to work with my mentor on twenty meters a few times with great results. There was little QSB and the contacts were solid. We chatted for an hour each time about many subjects: black powder shooting, antennas, selling houses, travel, and enjoying cold weather. We both would love to move back to where winter is a force to reckoned with instead of the mild weather we both experience. He to Alaska, me to Northern Wisconsin. I miss the snow with a passion. Having three sets of skis stuck in a snow bank waxed for various conditions; ah I miss it indeed. I've a movie on hold (Th Hunt for Red October) but did wish to get this note out before tomorrow. I have also found someone to help me while I travel. She will come up here to take care of Sam and the fire. While my new friend is here I will get to travel and Sam will be spoiled even more than he already is. We both miss Pat but that cannot be helped; she cannot be replaced. Some of her clothes will be donated to charity, some to rest homes. Some of her books and tools will go elsewhere. Hopefully soon all you folks who desire a low number K3 will have your wishes granted. One never can tell what else may come out of the skunk works at Aptos :) I'll be here to read the mail, hear the news, and work the folks with new serial numbers. But, then, I like chatting with you all each and every Sunday. Please join us tomorrow evening. Tomorrow: 1) Hail signs (first letter or two of the suffix of your call) 2) NCS help (as well as QSP/QNP help) Please join us: Sunday 2300z (Sunday 4 PM PDT) 14050 kHz Monday 0200z (Sunday 7 PM PDT) 7045 kHz 73, Kevin. KD5ONS ecn.visionseer.com P.S. I will call East first so, as the band changes, I'll eek out the most contacts. Please still your paddles while I call further away from Oregon, it truly helps. KJR ___ 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] ECN update
Sam has been turned; Chesire expression unchanged. 73 All, KD5ONS ___ 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
