Re: [Elecraft] K3 Keying - minority opinion?
Here's a thread of discussion on Ultimatic keying for other Elecraft products: http://n2.nabble.com/Ultimatic-keying-in-KX1-K1--td447092.html I've used it in the K1EL keyer, which is done with an 8-pin chip that costs about $1, so I don't think it's that much effort. I'd rather like to try Ultimatic on my K3, but I'm unlikely to try ESSB. I don't think it's productive to criticize feature requests as not being useful. But if ESSB helps Elecraft reach higher product volumes and deliver the features I want, I consider it a plus. Leigh/WA5ZNU Wasted effort as far as I am concerned Jim K4JAF - Original Message - From: Jack Regan [EMAIL PROTECTED] To: elecraft@mailman.qth.net Sent: Saturday, September 06, 2008 5:23 PM Subject: RE: [Elecraft] K3 Keying - minority opinion? Wayne (and Gary) I hope you and Gary will reconsider adding Ultimatic/Single Lever Paddle support to the K3 internal keyer. I think that more than Don, Dave and myself would welcome that addition to the K3. The elegance of the K3, a rig that rivals and even surpasses many of the very high end radios, is diminished by the need to use an external keyer to use a mode that many find invaluable. Removing the need to add another piece of gear to the table top is not a minor inconvenience. The small size of the K3 seems to be an attempt to make it convenient for field/portable use and to then require another piece of gear to make it work seems to diminish its attempt to reach that goal. Jack, AE6GC, KX1 1403, K3 1433 -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of David Ferrington, M0XDF Sent: Saturday, September 06, 2008 11:20 AM To: wayne burdick Cc: [EMAIL PROTECTED]; Elecraft Reflector; DOUGLAS ZWIEBEL Subject: Re: [Elecraft] K3 Keying - minority opinion? I have to say I'm hoping that by the time it matters to me, Elecraft will have implemented Ultimatic, otherwise I can see myself buying a WKUSB or K12-EXT and fitting it into the K3 somewhere. I realise that your're busy Wayne and this is probably quite a way down on your list, but please consider implementing Ultimatic, perhaps in place of Iambic if you have space issues and can give people the choice at f/w upgrade time? 73 de M0XDF, K3 #174 -- Mathematics is the language with which God has written the universe. -Galileo Galilei, physicist and astronomer (1564-1642) On 6 Sep 2008, at 14:33, Don Wilhelm wrote: Doug, All is well that Iambic B meets your needs, but it is not for everyone, even though we may be the minority. I need either a single lever paddle with an Iambic only keyer or Ultimatic mode and a dual lever paddle to send decent CW. The problem with dual paddles is that I squeeze too often and end up generating garbage. And that nasty Iambic B mode sends out the 'extraneous' extra element at the end! Ultimatic mode makes sense to my mind - I close the dash paddle and out comes dashes, close the dot paddle and out comes dots. The last paddle activated gets priority. It allows the insertion of one or more dots (dashes) in a string of dashes (dots) as well. It makes sense to my mind - the paddle that I close last is what is produced. I know there are not many users of this mode today, mainly because the popularity and convenience of the Curtis keyer chip and a few others encouraged the world to Iambic long ago. Ultimatic was the original keyer mode and was the main thing available back in the '50s and '60s. It is just more natural to me than those alternating dots and dashes. Those who must do 'slap' keying or must use a single lever paddle with an Iambic keyer might want to try Ultimatic mode - it is available in some of the K1EL keyers (the K12 is one) as well as several others (but no internal keyers that I am aware of). Ultimatic users 'stand up' and request that it be added to the K3 internal keyer! Wayne did give a strong 'maybe' when I asked. ___ 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 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 and Noise Reduction
David Woolley (E.L) wrote: div class=moz-text-flowed style=font-family: -moz-fixedTom Wylie wrote: Is it possible to get noise reduction working when in Data mode like RTTY? How would data reduction work in such modes and, more importantly, why are those techniques not already being used in your data terminal? That should, of course, have said; How would *noise* reduction -- David Woolley The Elecraft list is a forum for the discussion of topics related to Elecraft products and more general topics related ham radio List Guidelines http://www.elecraft.com/elecraft_list_guidelines.htm ___ 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] Headphone Output - SSB Mode - Single Tone
-30 dBV is the level I found comfortable listening with my Heil Pro Set as well. Jack Joe Subich, W4TV wrote: What AF settings did you need to get 1V peak i.e. gain hi or lo and what front panel AF gain? CONFIG: AF GAIN = HI -30 dBV at 9:00 -20 dBV at 10:00 -10 dBV at 12:00 0 dBV at 2:30 +3 dBV at 3:30 +4 dBV at maximum 1V peak an excessively high headphone level. Even with my noise abused ears, -30 to -20 dBV is a comfortable listening level with the Heil ProSet (200 Ohm transducers) and -10 dBV is almost painful. At 0 dBV (1V peak), I can hear the ProSet across the room. 73, ... Joe, W4TV -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Paul Fletcher Sent: Sunday, September 07, 2008 1:50 AM To: elecraft@mailman.qth.net Subject: RE: [Elecraft] Headphone Output - SSB Mode - Single Tone Joe Subich, W4TV-3 wrote: DSP is set to 2800, center frequency is 1500 Hz (default). Signal source is an XG-2 (50 uV/-73 dBm) and ACG is Slow. Roughly, What AF settings did you need to get 1V peak i.e. gain hi or lo and what front panel AF gain? When I run the tests here I'll set the output using a scope but just curious. 73 Paul -- View this message in context: http://n2.nabble.com/Added-LIN-OUT-measurements-tp834406p950890.html Sent from the Elecraft mailing list archive at Nabble.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 ___ 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] UK Elecraft net report for Sunday 7th September
Conditions were surprisingly clear with most of the field day stations probably using higher bands by the time we started. Useful discussions on attending the HF Convention, receive audio artefacts, peaky ALC and transverter/linear drive levels and microphone/headset choices. John, GW0SYN, has a garment printing business and mentioned that if anyone wanted Elecraft sweat/Tee shirts for the HF Convention to look his web site up for contact details (http://www.logoking.co.uk). Stations on the net this week included: GW0SYN, John G0VGS, Ian M1PAF, Paul M0GJH, Andrew G0IDA, Berni G0MJW, Mike G4DBS, Barry M3WCK, Colin G3YPZ, John 73 until next week! Dave, G4AON K3/100 #80, Acom 1000, dipole antenna ___ 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] Stupid Question
Hi there all. This may have been covered somewhere in the past but I haven't found it. When you upgrade your firmware in the K3 should you redo your PLL and other alignments? Seems logical to do so but my K3 seems to be functioning very well without redoing the alignments. Any comments? Thanks 73 Dave KD1NA ___ 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] Headphone Output - SSB Mode - Single Tone
What AF settings did you need to get 1V peak i.e. gain hi or lo and what front panel AF gain? CONFIG: AF GAIN = HI -30 dBV at 9:00 -20 dBV at 10:00 -10 dBV at 12:00 0 dBV at 2:30 +3 dBV at 3:30 +4 dBV at maximum 1V peak an excessively high headphone level. Even with my noise abused ears, -30 to -20 dBV is a comfortable listening level with the Heil ProSet (200 Ohm transducers) and -10 dBV is almost painful. At 0 dBV (1V peak), I can hear the ProSet across the room. 73, ... Joe, W4TV -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Paul Fletcher Sent: Sunday, September 07, 2008 1:50 AM To: elecraft@mailman.qth.net Subject: RE: [Elecraft] Headphone Output - SSB Mode - Single Tone Joe Subich, W4TV-3 wrote: DSP is set to 2800, center frequency is 1500 Hz (default). Signal source is an XG-2 (50 uV/-73 dBm) and ACG is Slow. Roughly, What AF settings did you need to get 1V peak i.e. gain hi or lo and what front panel AF gain? When I run the tests here I'll set the output using a scope but just curious. 73 Paul -- View this message in context: http://n2.nabble.com/Added-LIN-OUT-measurements-tp834406p950890.html Sent from the Elecraft mailing list archive at Nabble.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
Re: [Elecraft] Stupid Question
Dave, You should not have to re-do any alignment after a firmware load. As part of the Firmware Test Team, I upgrade my firmware almost daily, sometimes multiple times each day, and I do *not* redo the PLL or any other alignment. I would only re-do an alignment if the firmware change directly affected it, and in that case, the firmware release instructions would state that it should be done. (It has not happened so far). 73, Don W3FPR David Robertson wrote: Hi there all. This may have been covered somewhere in the past but I haven't found it. When you upgrade your firmware in the K3 should you redo your PLL and other alignments? Seems logical to do so but my K3 seems to be functioning very well without redoing the alignments. Any comments? Thanks 73 Dave KD1NA ___ 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] Katiegram
Greetings, For those of you tracking this info: Factory assembled K3 ordered 12/07/07, first Katiegram received 05/05/08. I chose to wait till the KRX3 was ready. Second Katiegram received 08/28/08, scheduled UPS delivery 09/09/08. I'm anxious to get my chance to use this radio that receives such positive reviews. 73, Bob K3UL ___ 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] XV Transverter Operation with Other Radios
Ken - You wrote: Does this mean it cannot be connected to the K2 without a K60VX and KIO2? About $200.00 more! The short answer is yes, you cannot use a bare bones K2 with the XV transverters without purchasing options or making a modification to the K2. I have the same problem as you do; a K2 with no options and a XV-222 to interface to it. As a minimum, you need to either add the KIO interface ($100) or bring out a home brew keying line from the K2. The K60XV adds the ability to use the HF side without rearranging cables. This is handy, as with a set of transverters, one can have a bandswitching 160M to 432 MHz rig that is self contained without external switching and proper readout of all bands on the display. This is not a cheap option though, but it is high performance and convenient. This is the flip side of enabling one to build an inexpensive high performance transceiver. Many of the functions one takes for granted in other rigs are extra costs for the K2. This is not necessarily bad, one just needs to realize it up front when purchasing and planning for station expansion like the XV-222. It can be a bit frustrating though. It appears that the K3 does not have these issues, that is one can interface the transverters to the K3 without purchasing other options. I need to add the SSB option to my K2 as well, as many VHFers do not do CW, so I will put nearly as much money into getting the K2 and transverter ready for 222 MHz use as I did on the transverter. Nobody's fault but mine, but it does point out one of the limitations of the K2 that one does not necessarily appreciate at the time of purchase. - Duffey -- KK6MC James Duffey Cedar Crest NM ___ 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] K-3 Contest agc settings
If you are a contester please respond off list. What AGC settings are you using? In sprint last night I used the K-3 (first real contest) and I was less than thrilled with rx performance. Close by stations seemed to overload the rx. Something I didnt have with my MKV with the inrad mods and filters. Been fiddling with the settings but obviously dont have it right. filters in rig 2.8, 1.8 and 250 Mike/aj9c ___ 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] Harmonic Distortion and Audio Intermodulation in K3'sLIN OUT Port
Jack The obvious question is: what is the purpose of the resistor? Perhaps to create a driving source to comply with the manufacturer's data? David G3UNA What I found is that the 604 ohm resistor between U29's output amplifier stage and the TTC-108 transformer primary winding forces the TTC-108 isolation transformer to operate in a regime where the performance improving effects of a zero ohm driving source are not available. Hence, the TTC-108's 0.5% THD performance significantly limits the LIN OUT ports performance. Jack K8ZOA www.cliftonlaboratories.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] K-3 Contest agc settings
Others would like to know, please reply on list. David G3UNA - Original Message - From: Mike Kasrich [EMAIL PROTECTED] To: Elecraft elecraft@mailman.qth.net Sent: Sunday, September 07, 2008 3:39 PM Subject: [Elecraft] K-3 Contest agc settings If you are a contester please respond off list. What AGC settings are you using? In sprint last night I used the K-3 (first real contest) and I was less than thrilled with rx performance. Close by stations seemed to overload the rx. Something I didnt have with my MKV with the inrad mods and filters. Been fiddling with the settings but obviously dont have it right. filters in rig 2.8, 1.8 and 250 Mike/aj9c ___ 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] Harmonic Distortion and Audio Intermodulation in K3'sLIN OUT Port
You'll have to address that question to the Elecraft design staff. My guess is that it was to protect the DAC's output amplifier from short circuits a user might inadvertently apply across J22, the LIN OUT port, but that can be done with much less resistance. In fact, the winding resistance of the TTC-108 is probably adequate for this purpose without any additional resistance. Question: You are given a transformer with no specifications. How do you determine the transformer's rated operating impedance? The answer to this question should suggest that there is no inherent operating impedance. Jack David Cutter wrote: Jack The obvious question is: what is the purpose of the resistor? Perhaps to create a driving source to comply with the manufacturer's data? David G3UNA What I found is that the 604 ohm resistor between U29's output amplifier stage and the TTC-108 transformer primary winding forces the TTC-108 isolation transformer to operate in a regime where the performance improving effects of a zero ohm driving source are not available. Hence, the TTC-108's 0.5% THD performance significantly limits the LIN OUT ports performance. Jack K8ZOA www.cliftonlaboratories.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] WA3WSJ Oct 17-20 AT QRP Hike
Hello all, I'm tentatively planning the third-leg of my four-part hike series to the Maryland State Line. I started this hike on the NJ/PA AT Line with two other hams, but it's just me and my dog Trevor Boy now! I'll start my AT hike at Pine Grove Furnace S.P. on Friday, October 17th. I'll then hike four miles on the AT to Toms Run Shelters and spend the night. Saturday I'll hike around 6.5 miles to Birch Run Shelters and operate the Polar Bear Moonlight Madness Event from this shelter. Sunday, I plan to hike 7.5 miles to Quarry Gap Shelters to take a break. Depending on how I feel, I'll either spend the night or hike the extra two miles down to Caledonia S.P. to my truck and back home. I hope to work many while hiking this leg of my Footsteps to Maryland Hike Series. http://wa3wsj.homestead.com/Hiking.html I'll be using my Elecraft KX1 and my Black Widow Vertical on the hike. One more hike to finish off PA!!! 72/73, Ed, WA3WSJ ___ 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] K-3 Contest agc settings
If you are a contester please respond off list. I chose to reply to the list because this is a topic of interest to many, whether contesting or not. What AGC settings are you using? In sprint last night I used the K-3 (first real contest) and I was less than thrilled with rx performance. Close by stations seemed to overload the rx. Something I didnt have with my MKV with the inrad mods and filters. Been fiddling with the settings but obviously dont have it right. All my operating is contesting and I've used two K3s for a year now. At home, there are several local contesters just a few miles line-of-sight off the back lobes of my Yagis. At 1.5 KW they saturate my S-meters. Still, they are unnoticeable when outside my filters and I'm usually run the default AGC settings. Most people have reported just the opposite comparison between the MKV and K3, i.e., they prefer the K3 RX in contest or crowded band conditions with strong signals nearby. The PREamp has more impact on RX overload than the AGC in most cases. On the low bands, you may even need to engage the ATTenuator. Don't make the AGC do all the work by slamming it with too much signal strength. Certainly, you can optimize the AGC for different conditions by changing the threshold and slope. For many it is a matter of personal preference more than an absolute correct setting. You will probably want higher thresholds on the lower bands due to the noise level. The slope is a trade-off between reducing gain for strong signals and still having discrimination between different signal strengths. If you keep the front-end tamed down with appropriate PRE and ATT engagements, then you will find the AGC gives you fine control over the range of signal strengths rather than relying on it alone for dealing with the very strong signals. filters in rig 2.8, 1.8 and 250 Remember your 250 filter is really 370 Hz at the -6 dB points, so you might have it engage at DSP bandwidth of 350 or 300 Hz. But even at 350, the cascade effect will produce an overall bandwidth of less than 300 Hz, which is a bit narrow for CW contesting, IMO. At DSP WIDTHs of 400-500 Hz, your roofing filter will be the 1.8 kHz, if you have it configured normally, so that doesn't give you IMD protection for the DSP with very strong signals located between your DSP and crystal filter widths. (I should point out that some K3 ops don't subscribe to the K3 design that deploys the crystal filters as roofing filters that are set wider than the DSP WIDTHs to protect the DSP. Instead they prefer the passband shape of the crystal filter and effectively eliminate the DSP filter by configuring their K3 filtering to have the crystal filter engage at DSP bandwidths GREATER than the crystal filter. Until the DSP WIDTH is reduced to well within the crystal filter bandwidth, the crystal filter is dominating the passband shape and filtering. Of course, the DSP will still provide steeper skirts at a point well below the passband.) 73, Ed - W0YK P.S. Thanks for the Sprint Qs! ___ 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] Harmonic Distortion and Audio Intermodulation in K3'sLIN OUT Port
On Sun, 07 Sep 2008 11:27:39 -0400, Jack Smith wrote: Question: You are given a transformer with no specifications. How do you determine the transformer's rated operating impedance? The answer to this question should suggest that there is no inherent operating impedance. Only for Alice in Wonderland. It could also suggest that the manufacturer doesn't know any better and hopes you won't either. A transformer is a passive circuit element with a rather complex equivalent circuit that includes resistance in each winding, stray capacitance in each winding and between windings, and leakage inductance. There may also be stray capacitance to a frame or enclosure. The magnetic material contributes more resistance and non-linearity, which means that some values in the equivalent circuit vary with the applied signal. Transformer performance can be optimized for a given circuit configuration and set of operating conditions by many design decisions made by the transformer manufacturer. What core material, how much of it, what form? How many turns, how are they wound, to what degree of uniformity and balance? Is there a magnetic shield? Is there a Faraday Shield? Some manufacturers are far more aware than others of these parameters and how they can be optimized for a given application. If you look at the Jensen catalog (www.jensen-transformers.com) you will see transformers for use as output transformers and for use as input transformers. You will see transformers rated for a range of levels and frequency response. Ya pays yer money and ya takes yer choice. Fundamental circuit analysis dictates that for optimum performance, the complex equivalent circuit and its non-linear properties must be considered in the design of circuit. Deane Jensen's 1978 applications note, referenced below, addresses the function of a build-out resistor for a modern op amp. In essence, the op amp needs to be protected from instability that can occur with a capacitive load. Most pro products use a value on the order of 80-100 ohms. As Jack observes, there is already series resistance in the equivalent circuit, and this may be sufficient. http://www.jensen-transformers.com/an/an001.pdf 600 ohm build-out and termination has not been used in pro audio for at least 40 years. Among other things, it wastes 6 dB of headroom, and as it is used here, inhibits damping of transformer non-linearity by the output stage. 73, Jim Brown K9YC ___ 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] K-3 Contest agc settings
On Sun, 7 Sep 2008 08:51:19 -0700, Ed Muns wrote: The PREamp has more impact on RX overload than the AGC in most cases. On the low bands, you may even need to engage the ATTenuator. Don't make the AGC do all the work by slamming it with too much signal strength. I'm one of those guys not far from Ed, and I agree with all of his comments. I had the preamp off on 20M; on 80 amd 40M, I had the preamp off and the attenuator engaged. I am VERY pleased with how well the K3 stands up in a crowded band. I have 400 Hz roofing filters in both of my K3s. One of them also has a 1.8 kHz filter, and I'll probably add one to the other one. There were several times last night when I took the IF down to 50 or 100 Hz to pull someone out! 73, Jim K9YC ___ 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] Harmonic Distortion and Audio Intermodulation inK3'sLIN OUT Port
You'll have to address that question to the Elecraft design staff. My guess is that it was to protect the DAC's output amplifier from short circuits a user might inadvertently apply across J22, the LIN OUT port, but that can be done with much less resistance. I can't speak on behalf of the designer either, but more often that not, a series build-out resistor equal to the specified primary Z is oftentimes seen in professional audio applications when driving the transformer from a near zero Z source -- like an op-amp. *Some* designers feel an absolute need to match the source Z with the transformer primary. In reality, the best value for Rs is what produces the best compromise between distortion, transient response, protection to the driving source, noise, and secondary output level. Speaking of transient response, I have ordered the TTC-108 and Triad TY-145P transformers and will be testing them against a high quality Jensen type. High quality transformers like those made by Jensen are generally uniform in phase and amplitude as a function of audio frequency. A Tektronix TM series audio test set will be used compare square wave response under varying degrees of source and terminating Z across all three transformers. A square-wave test through a transformer can be important in this application since an improper termination of the secondary can lead to severe overshoot and ringing into relatively Hi-Z bridging devices like a PC sound card. While sine-wave level testing may appear to be acceptable, bizarre results can occur when trying to feed a demodulated CW signal (a square wave-like source) into a PC sound card for applications like CW Skimmer. Paul, W9AC ___ 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 VCO CAL S/N 906
I am trying to perform the initial VCO CAL. When I exit with MENU, the calibration starts, runs rapidly up to 127, and then halts with VCO Error 5. Any suggestions? I have sent an email to K3 support, but they are sometimes off on Sunday too ;-) Vy 73, Bob DJ0MBC/WU5T ___ 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] Katiegram for KRX3 arrieved
Hallo I received a Katiegram at Friday for my KRX3 ordered on the 17th of September, 2007 vy 73 de Bernd DL8SCG/KI4ERB K3 #712 ___ 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 Rear panel PTT-in RCA jack doesn't work
I am beginning to wonder if my K3 Rear panel PTT in RCA jack has a problem. It appears totally dead - I can't get it to switch the radio to tx. Also, it has no voltage across it that I can pull down by shorting the pins I must have some configuration option screwed up, but have tried several changes to no avail. My front mic socket PTT works, as does both the radio PTT command on the CAT and the RTS line when I set that option. What am I doing wrong? How can I prove to myself that this jack is OK? Jerry W4UK ___ 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 display and IF with SDR14
Hi All, My K3 serial number 1401 dumped the display. I can get it to display for a few seconds sometimes but other times it is dead at start off. I've removed front panel and looked for obvious things and even tried cool it to see if it is a heat problem but no luck. I'm thinking it will turn out to be a bad LCD driver as it seems to be getting worse with time. Just bad luck I guess as already I got the bad board for the instability of the power output, a bad optical encoder and a bad 400 hz filter. Good thing for Ham Radio Delux as I was not able to see configuration data after doing a reset!!! On to an interesting topic. I've interfaced my SDR 14 to the IF output and have been having a great time looking at band activity and being able to select the qrg from the screen. I just wizz up to a cw signal and have set the center QRG and demod up so that the line in the middle of the screen represents the exact qrg so I can hear the sig on the computer and the rx at the same time. Here is the interesting part, When I apply filtering the IF on the spectrum analyzer shifts with the two filters. I have a 400 hz inrad filter 8 pole and a 200 hz Elecraft 5 pole filter.I've got the center set at 600 hz on the analyzer and have the filters set up properly in the configuration but there is a shift and as a mater of fact that occurs at the same time as there is a drop out when using the shift control as you roll through one filter than another. Can anyone shed some light on this? Thanks Bob Ansell K1WGM ___ 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 display and IF with SDR14
there is a shift and as a mater of fact that occurs at the same time as there is a drop out when using the shift control as you roll through one filter than another. Can anyone shed some light on this? Yes, the correct BFO injection shifts depending on the width and center frequency of the roofing filter. SpectraVue allows entry of an IF offset, but not by mode, so you'll see this slight shift as you change width. 73, 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
Re: [Elecraft] IARU Region 1 SSB Fieldday this weekend
We, DK0MN/P, got rather wet too... vy 74 de toby ___ 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] K-3 Contest agc settings
Exactly! We'd all like to know the contesters secrets, please reply ONLIST thank you. 73, Deni F5VJC David Cutter wrote: Others would like to know, please reply on list. David G3UNA - Original Message - From: Mike Kasrich [EMAIL PROTECTED] To: Elecraft elecraft@mailman.qth.net Sent: Sunday, September 07, 2008 3:39 PM Subject: [Elecraft] K-3 Contest agc settings If you are a contester please respond off list. What AGC settings are you using? In sprint last night I used the K-3 (first real contest) and I was less than thrilled with rx performance. Close by stations seemed to overload the rx. Something I didnt have with my MKV with the inrad mods and filters. Been fiddling with the settings but obviously dont have it right. filters in rig 2.8, 1.8 and 250 Mike/aj9c ___ 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 -- 73, Deni F5VJC ___ 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 Rear panel PTT-in RCA jack doesn't work UPDATE
I have learned that I should have 4.9V present on that line, and I don't, so it must be a hardware problem. I will try to fix it next time I open the radio up. This list is great to solve problems lilke this. Thanks guys. Jerry W4UK At 01:46 PM 9/7/2008, Jerry Flanders wrote: I am beginning to wonder if my K3 Rear panel PTT in RCA jack has a problem. It appears totally dead - I can't get it to switch the radio to tx. Also, it has no voltage across it that I can pull down by shorting the pins I must have some configuration option screwed up, but have tried several changes to no avail. My front mic socket PTT works, as does both the radio PTT command on the CAT and the RTS line when I set that option. What am I doing wrong? How can I prove to myself that this jack is OK? Jerry W4UK ___ 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] K3 and the SDR-IQ receiver
Anyone using the combination of the SDR-IQ receiver and the K3 together? Wonder how it and the specraview software works as a band scope? Jim K4JAF ___ 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 RTTY
On Sep 5, 2008, at 1:30 AM, Logan Zintsmaster wrote: I hope the group will pardon me while I engage in a bit of RTTY heresy. When you use a PC sound card for decoding RTTY, the center frequency is no longer important, just the tone spacings. With MTTY, I can pick any center frequency I want to use (typically 1000 Hz so I stay away from the roll-off) and tune until I see it in the MTTY spectrum window. I make any fine adjustments with the cursor to pick the signal I want if there are multiple signals shown. If I want a bandpass filter, I use the bandpass function in MTTY. MTTY uses the same audio frequency for encode as it used for decode so the signal is inherently locked to the received signal. It even has an AFC function to track any drift. All this is true for receiving. You can pick just about any center frequency you want. One problem with using the waterfall display and selecting from a wide bandpass is you don't get the level of unwanted signal rejection that is possible when using narrow crystal or DSP filtering. If there is a strong signal adjacent to your desired signal, you may not be able to decode properly. The K2 is equipped with a variable-bandpass filter that works very well on RTTY as it does on CW. In order to use this effectively, you've got to select a particular center frequency and adjust the filters around that frequency. This does require one to tune in a RTTY signal, but that is a pretty easy process using the crossed ellipse display. Using just the SSB filter for receive and transmit avoids the problem of center frequency tracking between the SSB filter that is always used on transmit and whatever receive filter has been selected. Except that you often don't want to use the SSB filter for receive. I generally use the variable-bandwidth filter set for 1.0 kHz. I also have settings for 0.5 and 0.3 khz. I only use the SSB filter to receive RTTY on a very quiet band. One other consideration -- when you are transmitting, you want only the AFSK signal to fit in the passband. This is the reason traditional RTTY was so high in the audio bandwidth. If you send tones of about 1000 Hz or so, then their second and possibly third harmonics may be transmitted as well. To avoid this, pick frequencies higher in the passband. With the limited BFO ranges on some K2s, it may be hard to center the variable-bandpass filter. I chose 1500 Hz as the center frequency for my RTTY tones for these reasons -- it places the second harmonic outside the passband of the SSB filter. I also chose a whole number as the center frequency so I can bring the DSP passband filters into play. It also has the advantage of allowing you to hear what is happening across the audio bandwidth so you know whether to go higher or lower for the next signal. Very useful in a contest. In a contest, I don't want the radio's AGC pumping against nearby signals -- I want those signals rejected -- another reason to use a narrow filter. Bill Coleman, AA4LR, PP-ASELMail: [EMAIL PROTECTED] Quote: Not within a thousand years will man ever fly! -- Wilbur Wright, 1901 ___ 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] K1 - BC-221 Box For Sale
I have a BC-221 box that is in very good condition for sale ($20.00 plus shipping from NC). All of the internal electronics are missing. This would make a great portable case for a K1 (or other similar sized rigs) and several accessories. Seems to me that there was a picture on the Elecraft web site somewhere in which a K1 was installed in a BC221 box. Contact me direct if interested. Otherwise, I will wait a week before placing it on eBay. 73, Henry - K4TMC ** Pt...Have you heard the news? There's a new fashion blog, plus the latest fall trends and hair styles at StyleList.com. (http://www.stylelist.com/trends?ncid=aolsty000514) ___ 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 and AutoSpot
I have been using K3/100 #1278 mostly on CW, and have become comfortable w the autospot feature. Is there a way to save freqs to memory w/ CWT enabled, thus eliminating the need to turn CWT on after each band change before using autospot? Apologize if this is covered somewhere 73 Tim N5IIT (K2 + K3) Any U.S. tax advice contained in the body of this e-mail was not intended or written to be used, and cannot be used, by the recipient for the purpose of avoiding penalties that may be imposed under the Internal Revenue Code or applicable state or local tax law provisions. The information contained in this message may be privileged and confidential and protected from disclosure. If the reader of this message is not the intended recipient, or an employee or agent responsible for delivering this message to the intended recipient, you are hereby notified that any dissemination, distribution or copying of this communication is strictly prohibited. If you have received this communication in error, please notify us immediately by replying to the message and deleting it from your computer. Notice required by law: This e-mail may constitute an advertisement or solicitation under U.S. law, if its primary purpose is to advertise or promote a commercial product or service. You may choose not to receive advertising and promotional messages from Ernst Young LLP (except for Ernst Young Online and the ey.com website, which track e-mail preferences through a separate process) at this e-mail address by forwarding this message to [EMAIL PROTECTED] If you do so, the sender of this message will be notified promptly. Our principal postal address is 5 Times Square, New York, NY 10036. Thank you. Ernst Young LLP ___ 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 and the SDR-IQ receiver
Anyone using the combination of the SDR-IQ receiver and the K3 together? Wonder how it and the specraview software works as a band scope? I've used SpectraVue with my SDR-14 and K3. It works quite well. THe interface is different than LP-PAN, and I have not attempted to use LP-Bridge with SpectraVue and the SR-14. 73, 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
Re: [Elecraft] K-3 Contest agc settings
Ed If I understand what I think you said, the agc settings are dependant on: Pre-amp on/off and / or Attenuator on/off The DSP filter width Which 1st IF filter is active and . the AGC SLP and THR settings are, for the most part a well kept secret and not to be shared. However mine are SLP= 8 and THR= 4 and, to me, it sounds pretty close to the K2. I don't use NR much on CW because of what it appears to do to the received CW signals. This is with MCU 2.34 and DSP 1.81, which may affect how those two settings are set. If SLP= 8 and THR= 4 are bad settings, please tell me why. 73HankK8DD - Original Message - From: Ed Muns [EMAIL PROTECTED] To: 'Mike Kasrich' [EMAIL PROTECTED] Cc: 'Elecraft' elecraft@mailman.qth.net Sent: Sunday, September 07, 2008 11:51 AM Subject: RE: [Elecraft] K-3 Contest agc settings If you are a contester please respond off list. I chose to reply to the list because this is a topic of interest to many, whether contesting or not. What AGC settings are you using? In sprint last night I used the K-3 (first real contest) and I was less than thrilled with rx performance. Close by stations seemed to overload the rx. Something I didnt have with my MKV with the inrad mods and filters. Been fiddling with the settings but obviously dont have it right. All my operating is contesting and I've used two K3s for a year now. At home, there are several local contesters just a few miles line-of-sight off the back lobes of my Yagis. At 1.5 KW they saturate my S-meters. Still, they are unnoticeable when outside my filters and I'm usually run the default AGC settings. Most people have reported just the opposite comparison between the MKV and K3, i.e., they prefer the K3 RX in contest or crowded band conditions with strong signals nearby. The PREamp has more impact on RX overload than the AGC in most cases. On the low bands, you may even need to engage the ATTenuator. Don't make the AGC do all the work by slamming it with too much signal strength. Certainly, you can optimize the AGC for different conditions by changing the threshold and slope. For many it is a matter of personal preference more than an absolute correct setting. You will probably want higher thresholds on the lower bands due to the noise level. The slope is a trade-off between reducing gain for strong signals and still having discrimination between different signal strengths. If you keep the front-end tamed down with appropriate PRE and ATT engagements, then you will find the AGC gives you fine control over the range of signal strengths rather than relying on it alone for dealing with the very strong signals. filters in rig 2.8, 1.8 and 250 Remember your 250 filter is really 370 Hz at the -6 dB points, so you might have it engage at DSP bandwidth of 350 or 300 Hz. But even at 350, the cascade effect will produce an overall bandwidth of less than 300 Hz, which is a bit narrow for CW contesting, IMO. At DSP WIDTHs of 400-500 Hz, your roofing filter will be the 1.8 kHz, if you have it configured normally, so that doesn't give you IMD protection for the DSP with very strong signals located between your DSP and crystal filter widths. (I should point out that some K3 ops don't subscribe to the K3 design that deploys the crystal filters as roofing filters that are set wider than the DSP WIDTHs to protect the DSP. Instead they prefer the passband shape of the crystal filter and effectively eliminate the DSP filter by configuring their K3 filtering to have the crystal filter engage at DSP bandwidths GREATER than the crystal filter. Until the DSP WIDTH is reduced to well within the crystal filter bandwidth, the crystal filter is dominating the passband shape and filtering. Of course, the DSP will still provide steeper skirts at a point well below the passband.) 73, Ed - W0YK P.S. Thanks for the Sprint Qs! ___ 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 Make more on your investments with qualified asset management. Click now! http://thirdpartyoffers.netzero.net/TGL2241/fc/Ioyw6i4ulIRaB5K0PWBazTvoDcbraYe7ekPFGhkhT1cWPPgui57Yhd/ ___ 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 7 Sep 2008 - 20m
WOW! What a change from a month ago! Kevin was 109. Bet no one has ever gotten that report before! I heard him acknowledge me, copied nothing of what he said other than the last 3 of my call but did hear him sign over to me. I put the amp on at 1.2 KW and beam NNW, don't know if he copied me, did not hear him again for several minutes. A month ago, Kevin was 589 to 10 over down here in N. Cal. I guess it's a testament to what E-skip can do, even at lower frequencies than we normally think of it working. 109 is also a testament to the K3 RX! Once Lyle told us that NR is really an FIR filter designed to ignore the noise and enhance the signal, I use it most of the time now. With NB and NR off, there was no discernible signal on the frequency. We'll see how 40 goes tonight, I think I'll be able to get to the rig at 0200Z. Oh, and note to Elecraft: Ignore all of my earlier whining about not enough audio in the headphones. I was exploring my radio today and found that, despite everything I had said in previous postings, the AF Gain was set at LO. :-( There's plenty of audio in the cans now even for the deaf old guy! I love this radio [in the amateur radio sense]! Don fixed a problem in my K2 and aligned it for me recently. Amazing difference, I love my K2 too [in same sense]. 73, Fred K6DGW - Northern California Contest Club - CU in the 2008 Cal QSO Party 4-5 Oct 08 - www.cqp.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] Elecraft CW Net Announcement
Hello, Bands are terrible. Never heard Kevin or anyone checking into the ECN tonight on 20m. Hope I can stay awake for the 40m net. 72 and Thanks, Ron Polityka WB3AAL www.wb3aal.com www.n3epa.org/ K1 - SN 01011 K2 - SN 01392 ___ 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] K-3 Contest agc settings
Ed If I understand what I think you said, the agc settings are dependant on: Pre-amp on/off and / or Attenuator on/off The DSP filter width Which 1st IF filter is active What I intended to convey was that to prevent overload, one should first make sure the front-end gain is not too high before worrying about AGC settings. Independent of AGC, the RX front-end can be too hot if the PREamp is enabled, e.g., on 40 - 160 especially, or if the ATTentuator is off on the low bands when signals are pounding in. My point about RX overload was to first turn off the PREamp and add the ATTenuator if required. The second point is to use the crystal filters as roofing filters to protect the DSP as the K3 was designed. The tighter they are around the DSP WIDTH you are using, the better protected the DSP is from nearby strong signal IMD. THEN, worry about setting the AGC parameters to optimize to your preference. It is futile to deal with RX overload with only the AGC if you've got the front-end too hot and have wide roofing filters letting IMD be created in your passband. and . the AGC SLP and THR settings are, for the most part a well kept secret and not to be shared. Few people change the AGC settings from the default and even fewer people understand what the AGC settings do and how to adjust them to achieve what you want. This reflector has had some good posts on AGC parameters from W8JI and K8ZOA. So, I don't think AGC settings are secret and not to be shared so much as they are not well understood by many of us. Moreover, there is no single set of magic or ideal AGC settings for everyone and everyone's operating variations. The K3 defaults are probably the best single set of parameters for all of us. They may not be optimum in all situations, but they won't be terribly wrong either. However mine are SLP= 8 and THR= 4 and, to me, it sounds pretty close to the K2. I don't use NR much on CW because of what it appears to do to the received CW signals. This is with MCU 2.34 and DSP 1.81, which may affect how those two settings are set. I'm using the defaults of SLP=010, THR=005, HLD=000, AGC-F=120 for CW. I used 2.38 and 1.90 in the CW Sprint last night. Wayne updated 2.38 fifteen minutes before the Sprint to fix a minor issue with how RIT Clear was working from our contest loggers. Both my K3s and at least two others updated with this firmware and ran flawlessly. (Those of you who worry about Beta releases posted on the Elecraft web site, take note. For 15 months now, I have always updated to the latest K3 firmware, even this close to the start of a contest. I would never do that with any other software or firmware. The K3 firmware updates are not perfect, but I have high confidence in them.) If SLP= 8 and THR= 4 are bad settings, please tell me why. I don't think those are bad settings, but I haven't operated your K3 at your location at the times you operate, etc., etc. The whole range of possible AGC settings is reasonable depending on operating conditions and personal preference. Personally, the default AGC settings have worked well for me, so I haven't invested the time to experiment. Changing AGC settings is not something you can do and immediately know if they are better. This is because every signal and band and noise situation is different, so you need to experience the AGC settings over a range of operating conditions. You may want to change one, or at most two, parameters at a time and operate with them for a while to anecdotally compare to the previous settings. Over time you can get a feel for how much change in each will effect your receiving performance in various conditions. I suppose one could put SLP and THR on Programmable Function keys and adjust them real time on signals, but I've not found that to be a priority compared to other things I need to be worrying about while operating. If I need to reduce gain quickly, I reach for the RF GAIN knob. If I feel the AGC is getting in my way, I may even turn it off and just ride the RF GAIN control. Most of the K3s at VP6DX were operated with the AGC off, so AGC parameter values were irrelevant in their rather challenging conditions. Still, I'm looking forward to playing with the AGC parameters some more and trying to optimize them for my various operating scenarios, but it is not a high priority need right now. To summarize, RX overload should be first dealt with by using the PREamp and ATTenuator to achieve the right amount of gain in the front-end. Once that is set properly, then you can use the RF GAIN control and/or the AGC parameters to fine tune performance. You mentioned NR. I haven't found NR to be useful at all for CW, and while it works well on SSB, I don't use it there either, preferring to let my brain deal with the noise. 73, Ed - W0YK ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a
[Elecraft] Re: K1 - BC-221 Box For Sale - SOLD
The BC-221 box is sold. 73, Henry - K4TMC ** Pt...Have you heard the news? There's a new fashion blog, plus the latest fall trends and hair styles at StyleList.com. (http://www.stylelist.com/trends?ncid=aolsty000514) ___ 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
FW: [Elecraft] K3 and StepIR/Icom PW-1
Hi Tom, The K3 should not be used as an exciter for the PW1 unless the polarity of its external ALC input has been changed from positive-going (original) to negative-going (range 0 to -4V). Failure to heed this warning will result in extensive damage to the PW1, necessitating costly repairs (as much as $1800!) http://www.ab4oj.com/icom/main.html#alc Cheers for now, 73, Adam VA7OJ/AB4OJ ___ 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 and StepIR/Icom PW-1
To Tom , wherever you are-- I actually own a K3, PW-1 and SteppIR and have used them together. I was involved in the beta testing of the negative ALC mod and if you have any questions regarding my experiences please contact me off group. Mike WA8EBM Original Message - From: Adam Farson [EMAIL PROTECTED] To: elecraft@mailman.qth.net Sent: Sunday, September 07, 2008 9:08 PM Subject: FW: [Elecraft] K3 and StepIR/Icom PW-1 Hi Tom, The K3 should not be used as an exciter for the PW1 unless the polarity of its external ALC input has been changed from positive-going (original) to negative-going (range 0 to -4V). Failure to heed this warning will result in extensive damage to the PW1, necessitating costly repairs (as much as $1800!) http://www.ab4oj.com/icom/main.html#alc Cheers for now, 73, Adam VA7OJ/AB4OJ ___ 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: FW: [Elecraft] K3 and StepIR/Icom PW-1
I'm using the K3 with a PW-1 and the beauty of it is you don't need the ALC if you use the K3's capacity to store the power level (drive level) for each band. Obviously if you use the K3 barefoot at 100 watts you would have to be careful to turn it back down with the amp but I just leave it at the saved settings that I have established for output for each band. The proper drive level does vary somewhat by band. You are right about the ALC ..the K3 ALC is not compatible with the PW-1 and you should not connect the ALC line between the two. 73 de Greg At 09:08 PM 9/7/2008, you wrote: Hi Tom, The K3 should not be used as an exciter for the PW1 unless the polarity of its external ALC input has been changed from positive-going (original) to negative-going (range 0 to -4V). Failure to heed this warning will result in extensive damage to the PW1, necessitating costly repairs (as much as $1800!) http://www.ab4oj.com/icom/main.html#alc Cheers for now, 73, Adam VA7OJ/AB4OJ ___ 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
FW: [Elecraft] K3 and StepIR/Icom PW-1
Hi Greg, The PW1 uses the ALC loop as an essential part of its protective subsystem, as described in the service manual excerpt which I sent you. Any one of several anomalous operating conditions (including over-drive and load mismatch) will pull down the ALC line to reduce the drive. This is the amplifier's first line of defence. I would never put an expensive piece of equipment such as the PW1 at risk by connecting it to an exciter without a fully-functional ALC loop. Cheers for now, 73, Adam VA7OJ/AB4OJ -Original Message- From: Greg - N4CC [mailto:[EMAIL PROTECTED] Sent: 7-Sep-08 19:05 To: Adam Farson Subject: Re: FW: [Elecraft] K3 and StepIR/Icom PW-1 I'm using the K3 with a PW-1 and the beauty of it is you don't need the ALC if you use the K3's capacity to store the power level (drive level) for each band. Obviously if you use the K3 barefoot at 100 watts you would have to be careful to turn it back down with the amp but I just leave it at the saved settings that I have established for output for each band. The proper drive level does vary somewhat by band. You are right about the ALC ..the K3 ALC is not compatible with the PW-1 and you should not connect the ALC line between the two. 73 de Greg At 09:08 PM 9/7/2008, you wrote: Hi Tom, The K3 should not be used as an exciter for the PW1 unless the polarity of its external ALC input has been changed from positive-going (original) to negative-going (range 0 to -4V). Failure to heed this warning will result in extensive damage to the PW1, necessitating costly repairs (as much as $1800!) http://www.ab4oj.com/icom/main.html#alc Cheers for now, 73, Adam VA7OJ/AB4OJ ___ 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: FW: [Elecraft] K3 and StepIR/Icom PW-1
Adam -- I guess it depends on the user. Certainly having the ALC connected (if it were compatible) would be preferred...but my point is that saying the K3 should not be used as an exciter for the PW-1 [without ALC] is not entirely accurate. it is possible to use the PW-1 without ALC. It can be done and done quite safely. Granted you lose a measure of protection but if you use the K3 as I do -- where it recalls the drive setting by band, a unique feature of the K3 -- it is less likely that not having the ALC connected will ever be an issue. If you change the power settings frequently and are not careful to return them to the desired drive level when operating the amplifier then your chance of damaging the amp increases without the ALC. Cheers. 73 de Greg At 10:53 PM 9/7/2008, you wrote: Hi Greg, The PW1 uses the ALC loop as an essential part of its protective subsystem, as described in the service manual excerpt which I sent you. Any one of several anomalous operating conditions (including over-drive and load mismatch) will pull down the ALC line to reduce the drive. This is the amplifier's first line of defence. I would never put an expensive piece of equipment such as the PW1 at risk by connecting it to an exciter without a fully-functional ALC loop. Cheers for now, 73, Adam VA7OJ/AB4OJ -Original Message- From: Greg - N4CC [mailto:[EMAIL PROTECTED] Sent: 7-Sep-08 19:05 To: Adam Farson Subject: Re: FW: [Elecraft] K3 and StepIR/Icom PW-1 I'm using the K3 with a PW-1 and the beauty of it is you don't need the ALC if you use the K3's capacity to store the power level (drive level) for each band. Obviously if you use the K3 barefoot at 100 watts you would have to be careful to turn it back down with the amp but I just leave it at the saved settings that I have established for output for each band. The proper drive level does vary somewhat by band. You are right about the ALC ..the K3 ALC is not compatible with the PW-1 and you should not connect the ALC line between the two. 73 de Greg At 09:08 PM 9/7/2008, you wrote: Hi Tom, The K3 should not be used as an exciter for the PW1 unless the polarity of its external ALC input has been changed from positive-going (original) to negative-going (range 0 to -4V). Failure to heed this warning will result in extensive damage to the PW1, necessitating costly repairs (as much as $1800!) http://www.ab4oj.com/icom/main.html#alc Cheers for now, 73, Adam VA7OJ/AB4OJ ___ 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: FW: [Elecraft] K3 and StepIR/Icom PW-1
Hi Greg, Still, I would feel a lot more comfortable were Elecraft to correct the polarity of their external ALC input to the negative-going industry standard. I understand that this modification is presently underway. Given the growing popularity of solid-state amplifiers (which all provide negative-going ALC voltage, to my knowledge) I can think of no rational reason for not making this change. Cheers for now, 73, Adam VA7OJ/AB4OJ -Original Message- From: Greg - N4CC [mailto:[EMAIL PROTECTED] Sent: 7-Sep-08 21:00 To: Adam Farson Cc: elecraft@mailman.qth.net Subject: Re: FW: [Elecraft] K3 and StepIR/Icom PW-1 Adam -- I guess it depends on the user. Certainly having the ALC connected (if it were compatible) would be preferred...but my point is that saying the K3 should not be used as an exciter for the PW-1 [without ALC] is not entirely accurate. it is possible to use the PW-1 without ALC. It can be done and done quite safely. Granted you lose a measure of protection but if you use the K3 as I do -- where it recalls the drive setting by band, a unique feature of the K3 -- it is less likely that not having the ALC connected will ever be an issue. If you change the power settings frequently and are not careful to return them to the desired drive level when operating the amplifier then your chance of damaging the amp increases without the ALC. Cheers. 73 de Greg At 10:53 PM 9/7/2008, you wrote: Hi Greg, The PW1 uses the ALC loop as an essential part of its protective subsystem, as described in the service manual excerpt which I sent you. Any one of several anomalous operating conditions (including over-drive and load mismatch) will pull down the ALC line to reduce the drive. This is the amplifier's first line of defence. I would never put an expensive piece of equipment such as the PW1 at risk by connecting it to an exciter without a fully-functional ALC loop. Cheers for now, 73, Adam VA7OJ/AB4OJ -Original Message- From: Greg - N4CC [mailto:[EMAIL PROTECTED] Sent: 7-Sep-08 19:05 To: Adam Farson Subject: Re: FW: [Elecraft] K3 and StepIR/Icom PW-1 I'm using the K3 with a PW-1 and the beauty of it is you don't need the ALC if you use the K3's capacity to store the power level (drive level) for each band. Obviously if you use the K3 barefoot at 100 watts you would have to be careful to turn it back down with the amp but I just leave it at the saved settings that I have established for output for each band. The proper drive level does vary somewhat by band. You are right about the ALC ..the K3 ALC is not compatible with the PW-1 and you should not connect the ALC line between the two. 73 de Greg At 09:08 PM 9/7/2008, you wrote: Hi Tom, The K3 should not be used as an exciter for the PW1 unless the polarity of its external ALC input has been changed from positive-going (original) to negative-going (range 0 to -4V). Failure to heed this warning will result in extensive damage to the PW1, necessitating costly repairs (as much as $1800!) http://www.ab4oj.com/icom/main.html#alc Cheers for now, 73, Adam VA7OJ/AB4OJ ___ 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: FW: [Elecraft] K3 and StepIR/Icom PW-1
I once blew up an unprotected amplifier's output circuit when a flaky antenna feed line opened with 1500 watts RTTY applied. Prior to that, I didn't think I needed anything more than a hand on the drive level control to keep my amp safe. Now I make sure the ALC is there so the amp can cut that drive within milliseconds if the antenna opens up again. The K3 ALC fix is available from Elecraft. It works. Jerry W4UK At 12:00 AM 9/8/2008, Greg - N4CC wrote: Adam -- I guess it depends on the user. Certainly having the ALC connected (if it were compatible) would be preferred...but my point is that saying the K3 should not be used as an exciter for the PW-1 [without ALC] is not entirely accurate. it is possible to use the PW-1 without ALC. It can be done and done quite safely. Granted you lose a measure of protection but if you use the K3 as I do -- where it recalls the drive setting by band, a unique feature of the K3 -- it is less likely that not having the ALC connected will ever be an issue. If you change the power settings frequently and are not careful to return them to the desired drive level when operating the amplifier then your chance of damaging the amp increases without the ALC. Cheers. 73 de Greg At 10:53 PM 9/7/2008, you wrote: Hi Greg, The PW1 uses the ALC loop as an essential part of its protective subsystem, as described in the service manual excerpt which I sent you. Any one of several anomalous operating conditions (including over-drive and load mismatch) will pull down the ALC line to reduce the drive. This is the amplifier's first line of defence. I would never put an expensive piece of equipment such as the PW1 at risk by connecting it to an exciter without a fully-functional ALC loop. Cheers for now, 73, Adam VA7OJ/AB4OJ -Original Message- From: Greg - N4CC [mailto:[EMAIL PROTECTED] Sent: 7-Sep-08 19:05 To: Adam Farson Subject: Re: FW: [Elecraft] K3 and StepIR/Icom PW-1 I'm using the K3 with a PW-1 and the beauty of it is you don't need the ALC if you use the K3's capacity to store the power level (drive level) for each band. Obviously if you use the K3 barefoot at 100 watts you would have to be careful to turn it back down with the amp but I just leave it at the saved settings that I have established for output for each band. The proper drive level does vary somewhat by band. You are right about the ALC ..the K3 ALC is not compatible with the PW-1 and you should not connect the ALC line between the two. 73 de Greg At 09:08 PM 9/7/2008, you wrote: Hi Tom, The K3 should not be used as an exciter for the PW1 unless the polarity of its external ALC input has been changed from positive-going (original) to negative-going (range 0 to -4V). Failure to heed this warning will result in extensive damage to the PW1, necessitating costly repairs (as much as $1800!) http://www.ab4oj.com/icom/main.html#alc Cheers for now, 73, Adam VA7OJ/AB4OJ ___ ___ 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 Report for September 7th 8th, 2008
Good Evening, I do believe forty meters will be the death of me! Well, at least of my hearing ;) It was very loud tonight. The second half of the net had most operators working beneath the noise. There seemed to be a long line of prospective check ins too. I just got back from a walk with the black cat. Well, I walked he sort of squirmed around as I carried him. We got to the edge of the property where we could see into the mountains toward the ocean. I put him down and he went home. The twenty meter net ran for half an hour whereas the second net went for a little over an hour. With band noise came propagation. Funny thing how that works. On 20 there were many reports of QSB but I only heard it once. No QSB on 40 but there were both of the other two unfortunate Q codes. Before the net, as I was eating, I was listening to 40 meters and heard many voices. I did not hear them while I was running the net however. I wonder where they were located? On to the lists = On 14050 kHz at 2300z: K1THP - Dave - CT - K3 - 686 W3TMZ - Jack - FL - K3 - 1169 N0AR - Scott - MN - K2 - 4866 NO8V - John - MI - K3 - 820 QNI #45!! AB9V - Mike - IN - K3 - 398 K6DGW - Fred - CA - K3 - 642 W0RSR - Mike - CO - K2 - 5767 KL7CW - Rick - AK - KX1 - 798 NT1A - Nick - NH - K3 - 407 W0CZ - Ken - ND - K3 - 457 K9DMV - Joe - IL - K2 - 5628 On 7045 kHz at 0200z: NO8V - John - MI - K3 - 820 W6ZH - Pete - CA - K3 - 657 * QNI #135 * W0CZ - Ken - ND - K3 - 457 AB9V - Mike - IN - K3 - 398 K1THP - Dave - CT - K3 - 686 QNI #55!!! K6DGW - Fred - CA - K3 - 642 QNI #95 K9DMV - Joe - IL - K2 - 5628 W0JFR - John - CO - K3 - 994 W0RSR - Mike - CO - K2 - 5767 WC7S - Dale - WY - K2 - 4360 W4SEC - Pete - FL - K2 - 5813 K6PJV - Dale - CA - K3 - 1183 AK2B - Tom - CA - KX1 - 685 N7AF - Dave - AZ - K2 - 4795 NI0C - Chuck - MO - K2 - 5853 W1TU or W1TF ?? I am pretty sure it was Ty in Georgia for QNI #45 but the band was very, very noisy. WI6O - John - CA - K1 - 922 QNI #15!! N0AR - Scott - MN - K2 - 4866 * QNI #145 * KL7V/4 - Sam - AL - K2 - 6143 WA7BOC - Roger - WA - K3 - 75 AC6YY - Ed - CA - Norcal 40 Argh! Too many phone calls and interruptions. I want to get this off and get ready for the coming week. The weather promises to be very nice. I am going to enjoy the remaining summer days. Tomorrow I am going to take a hike and see if the intermittent springs are running. If not I will hike further until they push out of the ground lower down the hillside. As ever if there are any errors please send me an email with the corrections I will amend my notes and the database. Until next week stay well, 73, Kevin. KD5ONS (Net Control Operator 5th Class) ___ 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: FW: [Elecraft] K3 and StepIR/Icom PW-1
On Mon, 08 Sep 2008 00:00:06 -0400, Greg - N4CC wrote: Certainly having the ALC connected (if it were compatible) would be preferred.. It MAY be true for this amp, but at least some other amp mfrs advise against the use of ALC with their amps. They say that modern amps work fine without ALC if the operator is smart enough to turn down the drive so that the amp is operating properly (and an operator that isn't shouldn't be on the ham bands), and that depending on ALC to keep the drive level down as a routine matter will cause higher distortion than if the ALC was not used. Ten Tec is one of the mfrs that has published this in their manuals for at least 25 years. Now, I certainly do see the value of ALC as a protection mechanism in the case of a failure that causes serious antenna mismatch, but there are other ways to achieve that. 73, Jim Brown K9YC ___ 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: FW: [Elecraft] K3 and StepIR/Icom PW-1
Hi Jerry, Glad to hear that the fix has now been implemented. Cheers for now, 73, Adam VA7OJ/AB4OJ -Original Message- From: Jerry Flanders [mailto:[EMAIL PROTECTED] Sent: 7-Sep-08 21:40 To: Greg - N4CC; Adam Farson Cc: elecraft@mailman.qth.net Subject: Re: FW: [Elecraft] K3 and StepIR/Icom PW-1 I once blew up an unprotected amplifier's output circuit when a flaky antenna feed line opened with 1500 watts RTTY applied. Prior to that, I didn't think I needed anything more than a hand on the drive level control to keep my amp safe. Now I make sure the ALC is there so the amp can cut that drive within milliseconds if the antenna opens up again. The K3 ALC fix is available from Elecraft. It works. Jerry W4UK ___ 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
