[Elecraft] March Madness Polar Bear Moonlight Run

Hello, The Polar Bear are going out on March 11, 2006 for our moonlight madness run. Some of the Polar bears are camping out over night. If you would like to hunt the PB's on the air you can find out more information at www.n3epa.org and click on the Polar Bear link. If you are looking for

Re: [Elecraft] Solder?

Spence: I've been using Kester 285 for several years now and have had extremely satisfying results from it. As good as Multicore. 73, Tom HammondN0SS At 10:11 PM 3/6/2006, Spence Wilhelm wrote: Thanks Stuart, After using the solder from Circuit Specialists for awhile on some test

[Elecraft] CP1 Power Handling

Does anyone know what modifications would need to be made to the CP1 Directional Coupler in order to get it to handle 200W at 20dB attenuation? I'd like to use the CP1 as a cost effective means of extending the useful range of my OHR WM-2 QRP Wattmeter, but 30dB is more attenuation than I

Re: [Elecraft] CP1 Power Handling

You have a couple options. The flux density is higher, and therefore heating, with lower number of turns. They also go to a -43 mix (higher permeability) for the lower turns to keep the shunt reactance of the voltage xfmr high at 1.8 MHz. If you don't care about 1.8 MHz, you might be able to

RE: [Elecraft] CP1 Power Handling

Larry, If you have the time, I'd certainly appreciate it if you'd run it through your spreadsheet for me. Thanks! -Michael == You have a couple options. The flux density is higher, and therefore heating, with

Re: [Elecraft] CP1 Power Handling

A quick check shows that no small size cores will work for -43 material with 10T at 1.8 MHz and 200W. However, FT50B cores come close, and are fine at 3.5 MHz. FT50B is twice the thickness of the FT50A, and would fit on the board because the thickness would only add height. 73, Larry N8LP

RE: [Elecraft] CP1 Power Handling

Larry, Thanks! 200W is probably a bit on the high side for my needs (safety margin), so this looks pretty good. -Michael -Original Message- From: Larry Phipps [mailto:[EMAIL PROTECTED] Sent: Tuesday, March 07, 2006 10:29 AM To: Linden, Mike (BRC-Hes) Cc: elecraft@mailman.qth.net

Re: [Elecraft] CP1 Power Handling

Hi Michael, I designed the CP1 for Elecraft and in the process I performed many tests to evaluate the power handling capabilities. The power is limited by heating of the core and that is primarily a function of flux density and time. The published specification allows the rated power to be

Re: [Elecraft] CP1 Power Handling

It might also make sense to increase the turns to 14, which would give a coupling factor of 23 dB, and much more safety margin. Larry N8LP Linden, Mike (BRC-Hes) wrote: Larry, Thanks! 200W is probably a bit on the high side for my needs (safety margin), so this looks pretty good.

[Elecraft] Using an Amplifier with a K2/100

Hi, After using my K2/100 for nearly a year I finally got it hooked up to my Ameritron AL-811 amplifier. Previously, I had used the amp only with my IC-746Pro. I build a switch box to switch the amp keying. It also switches out the amplifier ALC (not that the K2/100 uses it) and it switches

Re: [Elecraft] CP1 Power Handling

Stacking cores can also help increase power handling capability without taking more pcb space (providing the core is flat on the pcb). -- Alan wb6zqz -- Original message -- From: Larry Phipps [EMAIL PROTECTED] A quick check shows that no small size cores will work

Re: [Elecraft] CP1 Power Handling

Bob, have you seen any difference between stacked cores and solid ones of the same total thickness? In designed my wattmeters, I found more heating with stacked cores... at least for one combination. The FT50B core is the same thickness as 2.66 stacked FT50 cores, or 2 FT50A cores. Larry N8LP

Re: [Elecraft] CP1 Power Handling

Bob What combination of core/turns would give up to 40dB and able to handle 100 watts and what frequency range would it have? Main interest is HF 73 Jim VE3TTN On Mar 7, 2006, at 11:46, Robert Friess wrote: Hi Michael, I designed the CP1 for Elecraft and in the process I performed

RE: [Elecraft] CP1 Power Handling

Robert, Thanks for the insight and alternate solution! -Michael -Original Message- From: Robert Friess [mailto:[EMAIL PROTECTED] Sent: Tuesday, March 07, 2006 10:46 AM To: Linden, Mike (BRC-Hes); elecraft@mailman.qth.net Subject: Re: [Elecraft] CP1 Power Handling Hi Michael, I

[Elecraft] KX1 with 3080 board

All, FYI, I just finished upgrading my KX1 to a four band radio! It is now capable of 20m, 30m, 40m, and 80m. Assembly of the new module for 30 and 80 meters was straightforward and well worth the effort. Ron produced an excellent instruction manual that greatly simplfied the process.

[Elecraft] EQP scoring clarified

We've added a bit more description regarding scoring to the EQP rules. If you were confused on any scoring issue, please review the rules page again and let me know if it now makes more sense. 73, Wayne N6KR --- http://www.elecraft.com ___

[Elecraft] next solar cycle: article

Just published on the Scientific American website is an article explaining what we might see in the next solar cycle. Very interesting reading. See: www.sciam.com/article.cfm?chanID=sa007articleID=000301B5-B8CD-140C- B8CD83414B7F 73, Wayne N6KR --- http://www.elecraft.com

Re: [Elecraft] CP1 Power Handling

That would not be very practical, because it would be 100 turns. I suggest using the existing 30dB design, and add external inline BNC attenuators like the Mini-Circuits HAT-10. That would give you 40 dB total. Larry N8LP Jim Byers wrote: Bob What combination of core/turns would give up

[Elecraft] KDSP2 sound on 14.249 Mhz

hi all, yesterday I finished the KDSP2 kit and mounted it. It works as expected - but when playing a bit with its possibility I found a regular (abt. 1 Hz) birdie sound when I am listening on 14.249 (and quite a bit up and down this frequency) when the Display button is pressed to show the

Re: [Elecraft] KDSP2 sound on 14.249 Mhz

Hello Werner! yesterday I finished the KDSP2 kit and mounted it. It works as expected - but when playing a bit with its possibility I found a regular (abt. 1 Hz) birdie sound when I am listening on 14.249 ... This is normal auxbus traffic, only present when the menu or clock is being

Re: [Elecraft] next solar cycle: article

Wayne, Thanks for a pointer to an interesting read.I was too busy with a divorce at the peak of the last cycle, but the previous one was sure fun. Since I like both HF and VHF/UHF weak signal this cycle has great promise. A good solar wind to energize, and the odd explosion to make

RE: [Elecraft] (no subject)

Bill, I beleive you are asking about an Amp Keying line for the basic K2 -- Take a look at the AMP keying partial kit from Elecraft and also look at Tom Hammond's website www.n0ss.net for an updated version - I believe Elecraft will be adopting Tom's improved Amp Keying circuit for the K2, but I

[Elecraft] Its here!

Fellow Elecrafters: The new rig arrived from Alan today, and I expect to put it on the air tomorrow. What is considered an acceptable level of SWR for a K2/100? 73, Steve Kercel AA4AK K2 S/N# 5383 ___ Elecraft mailing list Post to:

Re: [Elecraft] next solar cycle: article

Joe: I'd be very surprised if you'd need the MOAA to work 100 countries on 80m. The K2 should handle it easily. Comment on solar activity: During my time at ORNL we were occasionally concerned with modeling the long term history of solar activity, and we noticed that the solar cycle is

Re: [Elecraft] Its here!

Stephen W. Kercel wrote: What is considered an acceptable level of SWR for a K2/100? The latest K2/100 firmware and modification level will allow an SWR of up to 2:1 before it starts reducing the power level to protect the finals. You can operate with higher SWR, but you will have less

RE: [Elecraft] Its here!

Steve, Strive for SWR 1.5 although the KPA100 will not throtle back power level until SWR 2.0 is exceeded. 73, Don W3FPR -Original Message- The new rig arrived from Alan today, and I expect to put it on the air tomorrow. What is considered an acceptable level of SWR for a

Re: [Elecraft] KDSP2 sound on 14.249 Mhz

hi Lyle, txs for answering. Lyle Johnson schrieb am 7 Mar 2006 um 15:28: This is normal auxbus traffic, only present when the menu or clock is being displayed. This is explained on page 38 of the KDSP2 manual Receiver noise heard when Clock or DSP menu displayed. you are right. I should