[Elecraft] KPA100 problem
I've been testing the KPA100 that I've just finished building and have found a problem. The symptoms are a little weird, so bear with me. On 40m and 80m SSB, once the K2 PWR control is set to 11W or over, the RF output corresponds to peak full power. This seems to be frequency dependent and the audio frequency at which peak power is delivered changes between USB and LSB. When I whistle into the mike, I see full output on a scope and the power indication on the K2 also shows full scale, and the K2/KPA is drawing around 20A. If I turn the power to 10W, I see the expected power level on these two bands. If I turn the PA menu option to OFF, then power delivery throughout the power range 0.1 to 15W is as expected. On these two bands, CW power control is fine with the PA turned on, and varies as expected from 0-10, and then with tha PA on from 11W to 100W+. On 160m, 30m, 20m, SSB (USB and LSB) power delivery is correct. I didn't try any bands higher than 20m for this. So the problem seems to be PA ON only, affecting SSB only (USB and LSB) and only on two bands. The base K2 seems fine on these two bands within its normal 15W range. It appears as if there is a PA ALC/power control problem on these two bands in SSB mode. All the resistance checks and voltage checks during construction were fine. The only ones that were slightly off were the PA transistor base resistance check. I measured 11.6 ohms instead of the 12-18 ohms indicated on my DMM. All the others were within spec.I figured that 11.6 was within 5% of 12 and that might be DMM inaccuracy. Any ideas where to start looking for the problem? Thanks, David, M0DHO. ___ 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] rcvr designs prc-2000 USES DIRECT CONVERSION!
Another example is the Collins 95S-1A produced some years ago. This receiver is 'Software Driven' and covers the range from 5 kilohertz to 2 GHz in steps down to 1Hz. Its architecture is hybrid. Antenna signals between 5 kHz and 30 MHz are upconverted to 51.2 MHz and directly converted from there to baseband - e.g. audio. Antenna signals between 20 MHz and 2 GHz are Directly Converted to baseband, and yes there is an overlap between 20 MHz and 30 MHz. Baseband signals are processed by DSP. Modes handled are CW, L.SB, U.SB, I.SB, FM and AM. IMHO Direct Conversion has great performance potential, and the techniques in circuitry developed during the past decade could perhaps make Direct Conversion the architecture of choice sometime in the future. There is no doubt in my mind that SSB signals sound better from a DC receiver, likewise CW. 73, Geoff GM4ESD - Original Message - From: [EMAIL PROTECTED] To: elecraft@mailman.qth.net Sent: Tuesday, March 15, 2005 3:41 AM Subject: [Elecraft] rcvr designs prc-2000 USES DIRECT CONVERSION! He would joke about my K2 manpack. His used PRC-2000 cost over $2000. The receiver used. DIRECT CONVERSION. THEY DID FIND A WAY TO GET RID OFALL THE AUDIO ARTIFACTS AND IMAGES THAT WERE THE REASON WHY SUPERHET BET DIRECT CONVERSION AS THE GOLD STANDARDOF RCVRS. ___ 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] Balun
Radio Shack used to sell panel-mount 5 way binding posts, part number 274-661...Maybe they still do, but if not, Mouser does...These are single posts with a 6-32 male thread...Remove the funky Elecraft supplied screws and thread the binding posts into the balun...They will accept banana plugs... Jerry, wa2dkg K2 # 2549, KX1 # 839 ___ 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 to go survey
David Toepfer [EMAIL PROTECTED] wrote : What items do you take with you when you take your KX1 out for fun (no matter how close to or how far from home it may be)? Koss The Plug earbud headphones Pomona BNC to double 4-way binding post adaptor. Pelican Case model #1120 fitted for KX1, KXPD1 and BNC to 4 way binding post adaptor (bomb proof protection for the rig and fits into car trunk or small pack with no fear of ever damaging the rig in transit). Antenna - 24 ft length of #26 AWG Teflon coated, silver plated wire with a fishing snap swivel tied to one end and a banana plug on the other. Ground radials - 16 foot length of 5 conductor computer ribbon cable, split up to about 3 feet from one end and taped. Banana plug installed on the non split end (all conductors connected). About 30 feet of small diameter braided nylon fly fishing line and a 3/8 inch stainless steel nut. 10 X AA Nimh Cells in a 10 cell holder For Pedestrian Mobile operations I add : 13 foot telescopic fiberglass fishing pole cycling hydration pack to support pole and hold extra gear. cell phone lanyard looped under the KXPD1 before tightening to keep from dropping the rig into a snowbank or mud-puddle. Antenna - Linear loaded end fed wire consisting of 14 feet of 4-wire computer ribbon cable with outside two wires shorted at one end and a fishing snap swivel tied to the two middle wires. On the other end banana plugs installed on outside two wires. Two small velcro straps to secure the wire to the pole. Trailing Counterpoise - 29 feet of #26 AWG teflon coated silver plated wire with a banana jack on one end. Michael VE3WMB ___ 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 40 mmeter receive and onward...
Hello all, After reading about it a number of times it is great to experience first-hand the immediate assistance and suggestions you folks have provided! Within hours of my first post concerning 40 meter receive being dead I had several emails with exactly what I needed to solve the problem. (the C6 being in holes 1 2 instaed of 1 3 on J15). Things work FB now and almost done with last of stage III assembly. Looking forward to first contact (hopefully with another K2...) and am having lots of fun! Thanks again! Mike Sexsmith W7MSX KX1 #1034 K2 #4819 ___ 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] test
my posts have been bouncing so this is a test Don ___ 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] Fixing K2 Toroid Coils
At 10:02 AM 3/15/2005, Joe Jones wrote... So, bearing in mind that I only wish to secure the edge of the toroids that are upright and touching the PCB, not coat the whole toroid in adhesive, (and change the inductance) what adhesive would be best ...? Beeswax is the traditional material for fixing coils, and has the benefit of being removable using moderate heat. ___ 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] Fixing K2 Toroid Coils
Now that is a cool boat. (sorry, this starting to go OT but so cool. grin) Joe, you should plan this trip for the summer with a special QSL for contacting you on the boat. That is so neat. Michael N4NMR (Also, Joe, please contact me direct. I tried e-mail and your address doesn't work for me. (sorry for the OT).) Thanks. -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Dan Barker Sent: Tuesday, March 15, 2005 10:16 AM To: Elecraft Subject: RE: [Elecraft] Fixing K2 Toroid Coils I had to look, and others might want to also. Dan http://www.auluk.freeserve.co.uk/boats/willcrooks.htm snip Joe Jones Narrowboat 'Will Crooks' The Llangollen Canal N. Wales UK /snip ___ 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] Re: s/n 4276 VCO Alignment issue
K2 s/n 4276 VCO Alignment (p61) VFO set at 4000 kHz L30 verified as a 4.7 uH T005Z Adjusting L30 has no effect on R30 voltage reading. * At TP3, there is a 12100.93 kHz signal present. At TP1, there is a 7717.86 kHz signal present. R30 is only 0.019v Visually inspected all components, verified that all are the correct values and no components are installed backwards. Solder joints look ok. No solder bridges or un-soldered connections found. Changing bands does not change the reading at R30. Visually inspected D16 and D17, both appear OK. RFC15 is 8.5 ohms U6-1 during PLL test, goes from 0.006v to 7.63v U6-5 is steady at 4.004v RFC14 leads look good and has 10 turns. RFC15, C91 and C88 reinspected and appear ok. T5 looks like the photo. Tried spreading and compressing the windings. No change in voltage readings at R30. Other measurements: U6-1 = 7.65v U6-5 = 4.004v U6-6 = 4.88v U6-7 = 0.019v U6-8 = 8.05v U4-16 = 4.88v Please advise. Thank You William Smith KC4WVL ___ 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 S/N 4787 First QSO
Hi to everyone, Got the SSB and NB installed and decided it was time for that first QSO. A friend across town was happy to oblige. He was impressed with the audio. He recorded it and it sounds nice when played back. Received audio sounds a little tinnymaybe it is just my headphones and the tiny speaker. During the qso I realized that either there is no mike gain adjust or it's buried in a menu that I can't remember. Anyone know where that might be? I'm using the Elecraft/Heil MD-2 microphone. The mike is almost as big as the radio. hi hi I've realigned the 4 mhz and PLL three times against WWV and my friend says I am still 20-30 hz off. Does it settle down at some point or do I need to chase it every few days? My shack runs in the low 60 degrees and doesn't vary much. It's in the basement with a small space heater. Maybe related to the above, support at elecraft has decided I need the 12 microhenry inductor instead of the 10. That is based on a PLL range of 9.44 which, of course, is lower than than the minimum of 9.8. It should be here in a few days and we will see if that improves the stability. Twice when transmitting on 40 meters the over current indication appeared. I hit the display and max on 10 watts was 2.2 amps. Per supports suggestion I had set upper limit at 3.5 amps earlier. The 13.8 volts input is fused at 3 amps fast open so I wonder if the measuring circuit had a momentarily glitch. The over current did not open the fuse. Any thoughs on this one time, so far, glitch. Hopefully, today or tomorrow I'll get the 60 and 160 meter mods installed. Then to get a new wire antenna up and then start looking at a DSP and KPA 100. Not to worry, I've got nine antennas on an 80x100 ft city lotone wire is being replaced. Where does the fun ever end..(when it comes time to pay the credit card) Jim, AB0UK __ Do you Yahoo!? Make Yahoo! your home page http://www.yahoo.com/r/hs ___ 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 options FS, reduced...K2 / K1
Prices include shipping to US: Elecraft KFL1-2 2-band board (built)for 80/17 $50 all unbuilt: Elecraft KBT1 internal battery option $40 Elecraft KSB2 SSB option $85 Elecraft KIO2 RS-232 Interface $85 thanks, LL/K3ESE __ Do you Yahoo!? Yahoo! Small Business - Try our new resources site! http://smallbusiness.yahoo.com/resources/ ___ 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] QRP Websites
Just completed my first QRP rig - The KX1. It worked great the first time! What a cool radio. What are the best websites to monitor for general QRP info: antennas, contests, projects, etc. Thanks, Steve, AA6VO Fallbrook, CA ___ 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 to go survey
I have pictures of what I carry in a waist pack, and in an auxillary bag for mobile. Click on the pictures for closeups and mouseover for captions. See http://wa5znu.org/log/2005/03/kx1-bag.html I got most of the ideas from a presentation by Wayne N6KR. Altogether it is smaller than the old Standard HT I have around somewhere. Not pictured are my Pac-12 which I often use, or (if I need a portable tree) a Cabelas 14ft pole or an SD-20 (depends on walking or driving). Leigh / WA5ZNU On Mon, 14 Mar 2005 10:36 am, David Toepfer wrote: What items do you take with you when you take your KX1 out for fun (no matter how close to or how far from home it may be)? ___ 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] rcvr designs prc-2000 USES DIRECT CONVERSION!
Gentlefolk, I am part of a group of fellow Amateurs who have been working on homebrew phasing Direct Conversion Tranceivers for a while now. Details of our first attempt can be found at: - www.stevef.demon.co.uk/qrp2k/qrp2000home.htm and the later iteration is at http://www.qrp2001.freeserve.co.uk/background.htm . Design and prototyping for the QRP2004 is well underway and will be published when we can get round to it. These are homebrew designs, the sad thing is that we were trying to get someone with more time that we have to kit them however there was little interest at the time we presented the QRP2000 at Dayton. I think we have all built, or in my case are building K2s as well. There is something about the clarity of the audio from a DC RX which superhets never manage to achieve. The first ham project I ever made was a Sudden DCRX uring the venerable NE602...I had a lot of fun with itand was hooked Bye for now, Steve - Original Message - From: Geoffrey Mackenzie-Kennedy [EMAIL PROTECTED] To: [EMAIL PROTECTED] Cc: Elecraft Discussion List elecraft@mailman.qth.net Sent: Tuesday, March 15, 2005 9:43 AM Subject: Re: [Elecraft] rcvr designs prc-2000 USES DIRECT CONVERSION! Another example is the Collins 95S-1A produced some years ago. This receiver is 'Software Driven' and covers the range from 5 kilohertz to 2 GHz in steps down to 1Hz. Its architecture is hybrid. Antenna signals between 5 kHz and 30 MHz are upconverted to 51.2 MHz and directly converted from there to baseband - e.g. audio. Antenna signals between 20 MHz and 2 GHz are Directly Converted to baseband, and yes there is an overlap between 20 MHz and 30 MHz. Baseband signals are processed by DSP. Modes handled are CW, L.SB, U.SB, I.SB, FM and AM. IMHO Direct Conversion has great performance potential, and the techniques in circuitry developed during the past decade could perhaps make Direct Conversion the architecture of choice sometime in the future. There is no doubt in my mind that SSB signals sound better from a DC receiver, likewise CW. 73, Geoff GM4ESD - Original Message - From: [EMAIL PROTECTED] To: elecraft@mailman.qth.net Sent: Tuesday, March 15, 2005 3:41 AM Subject: [Elecraft] rcvr designs prc-2000 USES DIRECT CONVERSION! He would joke about my K2 manpack. His used PRC-2000 cost over $2000. The receiver used. DIRECT CONVERSION. THEY DID FIND A WAY TO GET RID OFALL THE AUDIO ARTIFACTS AND IMAGES THAT WERE THE REASON WHY SUPERHET BET DIRECT CONVERSION AS THE GOLD STANDARDOF RCVRS. ___ 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 Anti-Virus. Version: 7.0.308 / Virus Database: 266.7.2 - Release Date: 11/03/2005 ___ 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 S/N 4787 First QSO
Jim, AB0UK wrote: Got the SSB and NB installed and decided it was time for that first QSO. A friend across town was happy to oblige. He was impressed with the audio. He recorded it and it sounds nice when played back. Received audio sounds a little tinnymaybe it is just my headphones and the tiny speaker. - With my K2 set for optimum xmit audio, I find the receive audio tends to cut off more of the lows than I like on some signals. The ideal bandpass definitely changes with the voice on the other end. So I have FL2 set using the OPT1 filter for a BFO frequency that shifts the bandpass slightly to produce more bass in the signal (bandpass closer to the carrier freq). That gives me way to shift the tone of the received signal by changing filters. The settings for FL1 are *always* used for xmit, no matter what filter position you are using for receive, so adjusting the other filter positions to suit your taste will not have any affect on your transmit audio. Jim wrote: During the qso I realized that either there is no mike gain adjust or it's buried in a menu that I can't remember. Anyone know where that might be? Mic gain is set via an attenuator and then automatically adjusted in the speech processor I.C. The mic attenuator control is available under MENU option SSBA. SSBA 1 attenuates the audio by 10 dB. SSB 2 or 3 provides full gain with no attenuation. Jim wrote: I've realigned the 4 mhz and PLL three times against WWV and my friend says I am still 20-30 hz off. Does it settle down at some point or do I need to chase it every few days? One of the features that gives the K2 receiver its 'edge' in hearing weak signals over many of the other rigs is that the K2 does *not* use a fully-synthesized local oscillator. With that superior receive performance comes a trade-off: the K2 simply is not as stable as those other rigs with fully-synthesized L.O.s in crystal ovens. Still, current K2's are very, very good, but it deserves a good 15-minute warm-up. One other issue that affects your frequency readout is the ability of the K2 to reset the oscillators to a specific frequency. When you calibrate your K2, the analog voltages used to tune the oscillators are converted into digital values and stored as digital data in memory. When you tune in a specific frequency, the logic looks up those digital values and converts them back into the proper analog tuning voltages. This conversion back and forth is done by Digital to Analog Converters or DACs. DACs have a specific amount of accuracy. More accuracy requires bigger numbers and more memory. The tradeoff that Elecraft used between memory and accuracy puts the K2 within about 20 or 30 Hz of the expected frequency. That said, one might ask how accurate the other guy's rig is. A quick check for you is to tune in WWV. Give your K2 a 15 minute warm-up at least, then zero beat WWV's carrier and check your K2's frequency display. I just turned on my K2 a few minutes ago and it's showing WWV at 1.01 kHz right now - 10 Hz high. Ron AC7AC ___ 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] ears KX1 #1056 has ears
I am ecstatic KX1 #1056 has ears. Just completed Alignment and Test Part II after 12 hrs build time. I used the Elecraft XG1 to align the receiver on 20m first then 40m then attached an antenna and it just about took my ears off. Current drain in RCVR might be a little high at 35.6ma as THE MANUAL call for 32ma with low LED settings. de rc kc5wa ___ 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] QRP Websites
Well, QRP-L has been the home of serious QRPers for years. You should be able to find it with a simple search. Good luck and 73 Bob N6WG -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Steve Baum Sent: Tuesday, March 15, 2005 9:09 AM To: Elecraft@mailman.qth.net Subject: [Elecraft] QRP Websites Just completed my first QRP rig - The KX1. It worked great the first time! What a cool radio. What are the best websites to monitor for general QRP info: antennas, contests, projects, etc. Thanks, Steve, AA6VO Fallbrook, CA ___ 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] K2/100 and Ten Tec Titan
Talk about QRP sacrilege .. I moved the OMNI 6+ out of the way and connected the K2/100 to the Titan 425 amp. No RF feedback, no thumps, no instabilities; just a little flicker of the room lights and 1500 watts of rock solid QSK RF. Whens the next contest? ___ 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] Initial LCD Display Results
Okay, here is my first post to the group during assembly/test. This seems minor and may not really be a problem, just want to make sure. During the checks the first time the unit is powered up I get an annunciator for PRE. It was not specified as such in the manual. The PRE/ATTN button seems to work as it cycles relays and the annunciator moves from PRE to ATT to blank and then back to PRE again. I haven't yet tested to see if the correct relay is actually powered or not for each setting, however. I also see that if I turn the radio off it comes back on at whatever frequency I had last left it, however if I also set the PRE/ATT to blank when I power cycle it comes back on with PRE. Is this normal or is it a minor bug I need to troubleshoot? Thanks in advance for the responses! Mark, NK8Q Allentown, PA K2 S/N 4786 (in process) ___ 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] Which KSB2 bandwith do you like?
On Mar 15, 2005, at 3:41 PM, [EMAIL PROTECTED] wrote: I'm sure that this has been discussed many, many times, but would you be so kind as to give me the pros and cons of the various filter options? Also does grounding the crystals at the bases significantly improve filter performance? The current KSB2 uses the 2.2 kHz bandwidth, as designed by John KI6WX. This is probably a good choice for most hams. There are a few who like more fidelity in their audio, and opt for the 2.5 kHz bandwidth. Several builders have recounted this change. The only con on the wider bandwidth is you are more susceptible to adjacent QRM. The original KSB2 had about a 2.0 kHz bandwidth, which I thought was adequate. I'm one of the few who has opted for the 1.9 kHz filter. It really isn't any narrower than the original 2.0 kHz filter -- but it has a lot less passband ripple. Since much of my K2 use is during radio contests, I prefer the narrower bandwidth. When you order your KSB2, you can ask Elecraft for the appropriate cap values for any of these filters. I think they can handle that. 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
Re: [Elecraft] Which KSB2 bandwith do you like?
Paul, My filter has the 2.5kHz capacitor values fitted. The bandwidth I get is less than that, probably 2.2kHz-2.3kHz. To my ear this is about right, and feel that anything less would start sounding too restricted. It also seems to give a good response curve for rag chewing and DX/contest operation. I would recommend grounding the crystals at their bases, however be careful not to use too much heat or damage the crystal case seals. 73 Stewart G3RXQ On Tue, 15 Mar 2005 14:41:53 -0600, [EMAIL PROTECTED] wrote: Hello All: I'm sure that this has been discussed many, many times, but would you be so kind as to give me the pros and cons of the various filter options? Also does grounding the crystals at the bases significantly improve filter performance? Thanks in advance, Paul Rubin N8NOV Hot Humid Houston ___ 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
