Re: [Elecraft] When to use the preamps on the KX2/KX3 vs. K3/K3S

Wayne Burdick writes: If the signals exceed a certain threshold, firmware will automatically turn off the preamp. I generally operate in a fairly low noise environment and little strong signal interference. Still, it is nice to learn the KX2 has such safeguards built in, especially since

Re: [Elecraft] KPA500 cooling and efficiency

On 5/21/2018 23:18, ANDY DURBIN wrote: My KPA500 seems horribly inefficient when compared to my TS-590S running a similar power output. The data for the heating test showed a PA efficiency of 23%, far short of the "approximately 50%" stated in the specification. That's perfectly normal at th

[Elecraft] KPA500 cooling and efficiency

Bob, I have made no changes to the cooling of my KPA500. I also have no idea to what extent the designers of the KPA500 studied the thermodynamics of the design. I have, however, been surprised at how quickly it heats up.I abandoned a heating test with the amplifier only producing 100 W

[Elecraft] KPA1500 ATU

After "training" the ATU across part of the band and, I think, setting up the K3 so it should track, I notice some strange behavior.  As I tune to a different segment of the band, and stop, there's a delay or a second or so before the ATU relays switch. Other times, even though it's already bee

[Elecraft] When to use the preamps on the KX2/KX3 vs. K3/K3S

Occasionally we have a KX2 or KX3 user claim their rig has low receive sensitivity. Often this is simply because the preamp is turned off. These users may be used to superhet receivers like the one in the K3/K3S, where preamp-off sensitivity (MDS) is typically in the -130 dBm range (or better).

Re: [Elecraft] setting up k3s to be used in conjunction with K3/0

Here's the Quick Start Guide from Remotehams.com for the K3/0 Mini. Will that do? Cheers, David -- Sent from: http://elecraft.365791.n2.nabble.com/ __ Elecraft mailing list Home: htt

[Elecraft] setting up k3s to be used in conjunction with K3/0

Hi, This is my first post to this group so if I do something wrong please go easy on me. I have a K3s set up at home and I carry a KX3 with me when I travel. I'll be leaving in just over a week for an extended road trip. I'd like to get a K3/0 and take it with me to talk to people from my home

[Elecraft] OT: old ARRL RA Handbook info

Thanks to the many of you who replied.   Got wanted info pretty quickly.   Amazing how many are holding on to old RA handbooks.   73, Mike  AC5P __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://

Re: [Elecraft] KPS1500 fan noises

There are basically two types of radial blade fans and specific application for each one.   Those that "blow" and those that "suck".  There is a difference in the design of the fan blades and the application for a specific fan.   Also some are designed to have "air over the motor".  This is a p

Re: [Elecraft] Closed threads

Wes, I was going to say something but decided to keep my mouth shut. It's about time someone did. Thank you. 73 de K1AY On Sun, May 20, 2018 at 5:51 PM, Wes Stewart wrote: > I just love it when Eric declares a thread closed and ten guys write to > say "Thank you" or "I was going to say some

Re: [Elecraft] K3 for sale

Is your K3 still available? Tnx. -- Sent from: http://elecraft.365791.n2.nabble.com/ __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.q

Re: [Elecraft] KPA1500 fan noises

"The benefit to putting fans in back blowing through the stock screen/fans is that you get the slight added benefit of over-pressuring the chassis which tends to keep the chassis interior cleaner. Assuming adequate rear spacing, you can hide the fans a bit more" Yes. and the ultimate is plac

Re: [Elecraft] kpa1500 new issue

Well, I just spoke with Elecraft and it appears this problem was one they had run across in early engineering.  I sent them the config file which might have some indicatorsthey can look at and make some determinations.  But if it turns out to be what the engineer said it might, there might be a

Re: [Elecraft] KPS1500 fan noises

Roy, contrary to what the other guy said, that is a perfectly logical supplement to the OE cooling system.  ANYTHING that reduces the pressure at the exit venting will improve airflow over the heatsink. Increase inlet and exit free area and/or increase inlet pressure or reduce outlet pressure...

Re: [Elecraft] KPA1500 fan speeds and fan noise

Feel free to do that with your kpa1500.  While you're at it test how long it takes to reach 60C with and without the modified fan system.I'm comfy with hearing the fans come on and I even set the fan speed to 1 or 2 if I'm in a contest mode.  I don't think there's a thing astoo much cooling for

Re: [Elecraft] KPA1500 fan speeds and fan noise

Seems like if the internal fans don't go on, that means the fan on the top is cooling the amp. Chuck Hawley c-haw...@illinois.edu Amateur Radio, KE9UW aka Jack, BMW Motorcycles From: elecraft-boun...@mailman.qth.net [elecraft-boun...@mailman.qth.net] o

[Elecraft] KPA1500, First Impressions

So far, all looks good.  My only concern is that the ATU doesn't always find a good match, even when the antenna is below 2:1. With the default "stop" threshold set to 1.2, it often stops at 1.6:1 or greater.  A second tuning sometime helps a bit. Increasing tune power to 20W didn't help much.

Re: [Elecraft] KPA1500 fan speeds and fan noise

> On May 21, 2018, at 1:56 PM, Bill Stravinsky via Elecraft > wrote: > > If you are going to depend on those 2 fans sucking hot air out of the amp > instead of using the internal fans that push it where it needs to go, I think > you arepulling hot air out of the amp and that hot air has alread

Re: [Elecraft] KPA1500 fan speeds and fan noise

If you are going to depend on those 2 fans sucking hot air out of the amp instead of using the internal fans that push it where it needs to go, I think you arepulling hot air out of the amp and that hot air has already done its damage. BillK3WJV On Monday, May 21, 2018, 3:29:29 PM EDT, Roy

[Elecraft] OT: old ARRL RA handbook

Would anyone reading per chance have a 1960 or '61, '62 Radio Amateurs Handbook handy?Reply direct off list.  Thanks Mike  AC5P __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/m

Re: [Elecraft] KPS1500 fan noises

"Do the KPA1500 fans push air into the box? If so, why doesn't the KPA500 fan do that. If the KPA1500 fans pull out of the box why would it be appropriate to use an additional fan that opposes this airflow?" Yes, they do...which is also opposite of airflow in K3s. The idea of the additional

Re: [Elecraft] KPA1500 fan speeds and fan noise

Yes it does, normally air flow is from rear to top. The fans placed over the exhaust vent on top create a partial vacuum, drawing in air through the idle (or running) fans on the rear apron and out the top just like when the regular fans are doing that job. RoyK6XK "That doesn't move any

[Elecraft] test

test message __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this ema

Re: [Elecraft] KPA1500 fan speeds and fan noise

I have a KPA-1500  #171 and when I set the fans at 1 the air is being pulled from the back by only the middle fan on  the back. The air is exiting out the top cover, front, right.  This exit area is just a little over 5" x 8".  I feel a good deal of air coming out the top evenly distributed ove

[Elecraft] KPA1500 fan speeds and fan noise

>From the KPA500 kit build manual: "If airflow arrows are visible on the fan housing, they will show that air will be blown out of the back of the KPA500." It was a bit surprising to me that the KPA500 fan airflow is the opposite of natural convective flow but I accepted that was the intended

[Elecraft] Test 2018-05-21

This is 2nd test message. Please ignore. 73, John, no8v __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: h

Re: [Elecraft] KPA1500 fan speeds and fan noise

That doesn't move any air across the heat sink or solid state devices that need the air.  The air that comes out of those vents starts at the fans in the rear. BillK3WJV On Monday, May 21, 2018, 6:07:22 AM EDT, Roy Koeppe wrote: All, My solution is two 4.5-inch, 48-volt dc muffin fan

Re: [Elecraft] [K2] Using the K2 above 29 MHz

I made some measurements on my K2/K60XV. It seems the bandpass filter does cut off just above 28.8 MHz and the available 1 mW output from the K60XV drops markedly starting around 29 MHz. It would not be practical to use this output unless the bandpass filter were retuned. At the QRP antenna

Re: [Elecraft] KPA1500 fan speeds and fan noise

All, My solution is two 4.5-inch, 48-volt dc muffin fans sitting on half-inch tall rubber feet covering the top exhaust vent on amp. They are running on a 19-volt supply at a slow but effective cooling speed and are very quiet (drawing air upward). During normal CW rag chewing the main fans do

Re: [Elecraft] K4

Hi, definitely less birdies (impossible by tech) and less misbehavior ...it is enough for me. 73 - Petr, OK1RP - http://ok1rp.blogspot.com -- Sent from: http://elecraft.365791.n2.nabble.com/ __ Elecraft mailing list Home: http://

Re: [Elecraft] K2 - Issue after installing K60XV

possible long shot check status of D19 Alignment and Test cheers -- Sent from: http://elecraft.365791.n2.nabble.com/ __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.ne