Re: [Elecraft] Extra Protection For KPA500?

All: Thanks for the advice regarding protection for the KPA500. I use more than one rig with my KPA500 so one has to pay attention to the drive levels. I suspect the protection circuit could fail if you accidentally pump 100 watts into the amp now and then. Regarding the K3S power-per-band s

Re: [Elecraft] Extra Protection For KPA500?

Set the K3 or K3S TUNE power to 10 to 20 watts. I use 18 watts which drives my amp to 500 watts. Then set the Power Per Band for the required value to produce 500 watts. Then and this is a big THEN..turn on the Ext ALC in the transceiver and CORRECTLY calibrate the ALC value in the am

Re: [Elecraft] Extra Protection For KPA500?

Hi Tony You do realize that the KPA500 does have over power protection as well? Mike va3mw On Thu, Mar 5, 2020 at 6:17 PM Don Wilhelm wrote: > Rick, > > When you move into the new shack location, consider getting the new AUX > cables from Elecraft. If your original ones have a large (about 1/

Re: [Elecraft] Extra Protection For KPA500?

Rick, When you move into the new shack location, consider getting the new AUX cables from Elecraft. If your original ones have a large (about 1/4 inch diameter) cable, the new ones are smaller and more flexible. 73, Don W3FPR On 3/5/2020 5:57 PM, Rick Bates, NK7I wrote: Don et al, On occa

Re: [Elecraft] Extra Protection For KPA500?

Don et al, On occasion the signal that the amp goes into Operate mode is not passed along (or received, I don't know which), which means that the K3 will operate at higher than required drive level, for a moment only because the KPA500 will fault VERY quickly protecting everything. However,

Re: [Elecraft] Extra Protection For KPA500?

Curiosity is getting the best of me -- If the built-in protection works well, why do you need more protection? If the belt works OK, then why add suspenders as well? If you are operating a K3 or K3S, there is a per band power level that can be used. It will automatically use the settings for th

[Elecraft] Extra Protection For KPA500?

All: I'd like to avoid the inevitable situation where one mistakenly transmits too much power into an amplifier. I have a KPA500 and the protection circuit works well, but I was wondering what can be done to add an extra layer of protection? Tony

Re: [Elecraft] High Current only on 20 Meters

Completely true.  According to TLW, 1,000 feet of RG-58 with a dead short on the far end will also have a 1:1 SWR at the near end.  Even 500 feet will have an SWR less than 1.1:1 at the near end. In fact, as little as 100 feet of RG-58 will turn a 2:1 SWR at the far end into roughly 1.5:1 at

Re: [Elecraft] K4 news?

Hi Irwin, We are also concerned about the impact of the COVID-19 virus on the shipping and supply chains we use for parts used in all of our products, including the K4. While managing the supply chain and quickly finding alternate parts when they go obsolete or when shortages pop up has been a nor

Re: [Elecraft] Power Factor

In the late 1980s, HP Labs was having wiring failures and fires in the cubicle wiring. Someone visited from MIT Project Athena and made a side comment about their wiring problems with computers at every desk. For a while, HP Labs had extension cords strung everywhere to reduce the demand on the

Re: [Elecraft] Chinese Production Re: K4 news?

Yes, this will have a direct result in all production. >From Elecraft's perspective, it could be a simple knob that would result in a radio not being shipped. It only takes 1 part since you can't ship a radio unless it is 100.000% complete. Mike va3mw On Thu, Mar 5, 2020 at 8:33 AM N4ZR wrote

Re: [Elecraft] K4 news?

As I wait for my K4D… I just upgraded from a K4 and added a K-Pod as the Easter Bunny and I decided it may not be delivered until after Easter (early Apr) anyway. So, I am in a planning stage. BTW, the upgrade was easy. I sent an electronic message to Sales and Madelyn Gomez emailed me back an

Re: [Elecraft] Chinese Production Re: K4 news?

Lets start production in Silicon Valley again...:) I will be proud to have genuine Made in USA rigs again. - 73 - Petr, OK1RP "Apple & Elecraft freak" B:http://ok1rp.blogspot.com MeWe: https://bit.ly/2HGPoDx MeWe: https://bit.ly/2FmwvDt -- Sent from: http://elecraft.365791.n2.nabble.com/ __

[Elecraft] Chinese Production Re: K4 news?

Have you seen the incredible images of China before and after coronavirus, taken by a satellite specifically visualizing the amount of NO2 in the atmosphere . There *must* be a tremendous impact on suppl

Re: [Elecraft] K4 news?

I am curious to know if the reduction in manufacturing in China, do to the COVID-19 virus, is having an affect on the ability of Elecraft to obtain parts? The area of China that is the epicenter is a major manufacturer of electronic components. Irwin KD3TB On Wed, Mar 4, 2020 at 6:11 PM Rick Mi

Re: [Elecraft] Comments from Special Forces personnel on KX2 use

Hi Wayne, many thanks for that comments. It is good to know that USSF troopers are equipped with your KX2, lol... I am using KX3 in backpack in similar conditions (except copter crash) and I have to confirm that it survived everything and works like champ. The only size and weight is higher comp

Re: [Elecraft] Power Factor

Jim, Ok on that, I am a retired tradesman in the electrical industry, and looking at why an antenna radiates best when reactance is zero leaving only a resistance load (not taking radiation angle into account), would seem to be because the voltage and current across the radiated load are in phase p