Re: [Elecraft] UPDATE KPA1500 on 160M

Bill, ok on that, yes more electronic amplifiers especially use a swr limit to protect against the high voltages generated at high swr. Sometimes you are better off using a robust manual tuner made for the job external to the amp. High swr between a remote balun and atu at amp, will emphasis

Re: [Elecraft] my KPA1500 and 160M

Please quote your online reference please regarding ferrite cores being a dielectric If so then my not just use un-enammeled wire on a course wound core ? A dielectric is an insulator ; Dielectric From Wikipedia, the free encyclopedia Jump to navigation

Re: [Elecraft] UPDATE KPA1500 on 160M

Nowhere has there been a mention of what VSWR the tuner sees, only the result of its match which is 2.5:1. That means the VSWR it sees is beyond its capability to tune properly and run full power. This information is available on the KPA1500 panel display. It will also state the maximum

Re: [Elecraft] my KPA1500 and 160M

If you weren't too stubborn you could find many, many online references to the dielectric characteristics of ferrites.  A ferite core absolutely IS a dielectric.  There is nothing false about what I've been telling you. Dave  AB7E On 9/2/2020 9:02 PM, Adrian wrote: Now then, whether

Re: [Elecraft] my KPA1500 and 160M

Like I said, you're refusing to understand the physics of dielectric loss in a ferrite.  The heat is caused by dielectric currents induced by the high RF E-field from the VSWR, not the emf caused by the current in it. I'm done with trying to educate you. Dave   AB7E On 9/2/2020 8:12 PM,

Re: [Elecraft] my KPA1500 and 160M

Now then, whether you want to acknowledge it or not, a ferrite core IS a lossy dielectric and can get hot when you put a high enough RF voltage across it INDEPENDENT OF THE CURRENT FLOWING THROUGH THE WINDING AROUND THE CORE.  You can find innumerable references to the dielectric losses of

Re: [Elecraft] my KPA1500 and 160M

You neglect to fill in the missing part where voltage is causing the current which is causing the heat. The use of a magnetic core can increase the strength ofmagnetic field in anelectromagnetic coil

Re: [Elecraft] [Bulk] The KSYN3A synth will always be available as a K3 upgrade

Well, I guess now there is an end date. I’m glad I purchased the two I needed last November. > On Oct 1, 2015, at 2:54 PM, Wayne Burdick wrote: > > Hi all, > > Just to put an end to any unfounded rumors: The KSYN3A will always be > available for K3 upgrades. We use the same synth module in

Re: [Elecraft] UPDATE KPA1500 on 160M

Yes I have seen that, very good point, and I was also thinking about the lmr400 length earlier in the thread. I felt that Ronnie may not warm to that idea, so did not mention it. It is a bit of hit and miss sometimes with that solution, but once there, your done. On 3/9/20 11:41 am, James

Re: [Elecraft] UPDATE KPA1500 on 160M

Ok on that. I have good success with true OCF (not windom) antennas and Balun Designs 4:1 current baluns in the past. These days I just use apex high delta loops with direct feed via a lmr240 multi-wound toroid choke at feedpoint for great results. Bottom corner fed (vertically polarised),

Re: [Elecraft] my KPA1500 and 160M

OK ... I'm going to make this simple for you.  Picture a material (like a capacitor) with a lossy dielectric, and then apply a high RF voltage across it.  The dielectric passes a current as the result of the voltage, and the lossiness of the dielectric generates heat. With a lot of voltage

Re: [Elecraft] UPDATE KPA1500 on 160M

Ronnie, I’m kinda late to this dance, but did want to toss in my thoughts. I assume you are running a length of beefy coax from the back of the KPA1500 to the balun. I do the same with my KPA500/KAT500. About 10 feet of 9913 coax to the Balun Designs box, then 110 feet of 600 ohm line to the

Re: [Elecraft] UPDATE KPA1500 on 160M

4114T was the BD Balun model #. I'm not putting down there product at all. When strictly using the ATU in the K3 it matched wonderfully.The fly in the buttermilk was when the KPA1500 was thrown into the mix. Ronnie -Original Message- From: Adrian Sent: Wednesday, September 02,

Re: [Elecraft] UPDATE KPA1500 on 160M

Have you measured the impedance presented to the amplifier with an antenna analyzer? Jim ab3cv On Sep 2, 2020, at 9:03 PM, Adrian wrote: Ronnie, well done. Moving to a different ratio balun is a smart obvious move towards obtaining a better match, especially at higher power maintaining

Re: [Elecraft] UPDATE KPA1500 on 160M

Ronnie, well done. Moving to a different ratio balun is a smart obvious move towards obtaining a better match, especially at higher power maintaining insulation specs required. From curiosity what was the model number of the BD 4:1 balun you had initially please ? On 3/9/20 10:03 am,

Re: [Elecraft] my KPA1500 and 160M

I say that your response is completely false and you are missing basic electricity facts. The high voltage becomes an issue when insulation breaks down, and then *current *starts to flow through the fault path converting to emf & heat directly and via induced current resulting ;  P = E X I*.

[Elecraft] UPDATE KPA1500 on 160M

The original thread has gone off on some tangents. I truly appreciate all the suggestions. I seem to have cured the problem! ORIGINAL ISSUE was using a new W7FG 160m doublet with 600 ohm true ladder line. The ladder line was hooked to a Balun Design 4:1 ( as recommended by the seller of the

Re: [Elecraft] my KPA1500 and 160M

In KP3MM's recent post he reveals that the problem doesn't occur with his Clipperton amp at one KW, so it appears that the problem is indeed within the KPA1500.  But to be clear, he never said that the problem is there from the start.  In his recent message he says that it takes 15 to 30

Re: [Elecraft] KPA-1500 SWR fault above 700-800 watts on 160m

Update I took the Balun designs 4:1 out of line and put a Dx Engineering maxi core 5kw 4:1 in its place. It tunes a little better on 160 but the KPA1500 finally faults out and says cannot find match and shows 9:1 better than 99:1 So I put the KPA1500 straight to a 2.5kw bird dummy load and

[Elecraft] W2 WATT METER F/S

I have a Elecraft W2 watt meter for sale with the 200 watt coupler for $200.00    73s Bob W5RG __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post:

Re: [Elecraft] KPA-1500 SWR fault above 700-800 watts on 160m

Ken, sorry this is rather long, but here goes... I had a similar problem in the UK, with a OSCFD antenna, purchased from a UK company. I didn't question the theory and just assembled it according to instructions. As you would expect the antenna is made from two differing lengths

Re: [Elecraft] my KPA1500 and 160M

The problem is evident on first KPA1500 match attempt before any heating of the balun core is possible. It is not a core heat issue at all. If it was the OP would be able to get an ok initial atu match, that would then deteriorate with core heat..The issue is from the get-go. Also only

Re: [Elecraft] KPA-1500 SWR fault above 700-800 watts on 160m

If your Clipperton amp doesn't have the same problem then it does indeed point to the KPA1500. I don't own a KPA1500, but a quick look at the online manual shows that the tuning unit is an L-Network.  Depending upon the load the unit is trying to match, an L-Network can require a very

[Elecraft] K4 shipping

Have the firm prices been set yet? I looked but didn't see them on the web site. (Yeah, I know, "If you have to ask the price . . .") Ted, KN1CBR __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help:

Re: [Elecraft] [K3] K3 Utility hiccup

Hi Don, I just tried the same Macro (TU DON CWA) and sent it a few dozen times and it completes each time with no problem. Have you tried re-entering the Macro in another Macro slot. Can you describe what happens when it stalls? Does the displayed text in the text fields complete? David,

Re: [Elecraft] K4 Shipping?

I was #12 for the KX3. It was a field test. They do more in house now rather for more technical engineering feedback, I would guess. 72 & 73, Bill K9YEQ FT’er for K2, KX1, KX3, KXPA100, KAT500, W2, etc. -Original Message- From: elecraft-boun...@mailman.qth.net On Behalf Of Nr4c

Re: [Elecraft] my KPA1500 and 160M

Dave, Exactly my point. Doesn't take long to cause the core to go south. High voltage is fast. 73, Bill K9YEQ -Original Message- From: elecraft-boun...@mailman.qth.net On Behalf Of David Gilbert Sent: Wednesday, September 2, 2020 12:37 PM To: elecraft@mailman.qth.net Subject: Re:

[Elecraft] [K3] K3 Utility hiccup

When I use the K3 Utility Terminal tab to send CW via one of the macros (Utility macro, not K3 macro), occasionally the macro quits part way through. Any ideas as to what's going on? It's a really simple macro: TU DON CWA Configuration: K3 with latest firmware, MacBook Pro with latest version of

[Elecraft] KPA-1500 SWR fault above 700-800 watts on 160m

Every bit of antenna hardware ( coax, balun, insulators, etc. have been changed out or proven good. Connections are all solid. My KPA1500 will transmit above 800 watts for about 15-30 seconds and then the SWR jumps up and it faults out for high VSWR. I can run 1500 watts on all the other

Re: [Elecraft] Elecraft K3s Second Receiver for sale

I forgot to add that I have the Sub Receiver Installation Manual Irwin KD3TB On Wed, Sep 2, 2020 at 3:28 PM Irwin Darack wrote: > I have an Elecraft K3s KRX3A, Second Receiver for Sale. > > It contains the > >- Installed in the Sub Receiver are the KRX3A Main Circuit Board, >Mixer

[Elecraft] Elecraft K3s Second Receiver for sale

I have an Elecraft K3s KRX3A, Second Receiver for Sale. It contains the - Installed in the Sub Receiver are the KRX3A Main Circuit Board, Mixer Board, KNB3 Board & KFL3A-2.7 Filter - KSYN3A Synthesizer - Auxiliary DSP Circuit Board - Sub In Board - Sub Out Board I do not have

Re: [Elecraft] [K2] Spurious emission in SSB

Thanks to those who replied to my post. I've now reached the point where the level of the spurious tone is low enough. Here's what I did. Following Don's suggestion I isolated the KSSB2 speech processor from the balanced modulator by removing C20 and grounding the free end of R2 via a 100nF

Re: [Elecraft] my KPA1500 and 160M

On 9/2/2020 10:36 AM, David Gilbert wrote: High VSWR is very tough on ferrite cores. Yes. My Choke Cookbook is for matched loads at the point of insertion, and the first place for a choke should ALWAYS be at the feedpoint. There should be one of these chokes (NOT Balun Designs or Palomar)

[Elecraft] K3 FS - Reduced!

*Now reduced to move - $1,050 + shipping!* Working on downsizing and selling my K3. $1,650 plus shipping. Prefer pickup but could meet within 100 miles. K3/100-F1 K3 100W Xcvr. (Factory assembled) Serial #3746 KAT3-F 1 K3 ATU KXV3A1 K3 RX Ant, IF Out & Xvrtr Int

Re: [Elecraft] K4 Shipping?

I think they built 20-25 for Field Testors for the KX3. Sent from my iPhone ...nr4c. bill > On Sep 2, 2020, at 8:22 AM, N4ZR wrote: > > Not to be a curmudgeon, but don't you suppose they built at least this many > for testers? > > -- > 73, Pete N4ZR > Check out the Reverse Beacon Network

Re: [Elecraft] my KPA1500 and 160M

No ... overheating doesn't take much time at all. As I stated in my reply to Bill, high power and high VSWR will indeed heat up a ferrite core device ... balun or common mode choke ... and it can do so quite quickly.  In my case, I had a 160m Inverted-L that I put up rather hastily for a

Re: [Elecraft] my KPA1500 and 160M

More likely that the ferrite core is getting hot from excessive VSWR.  High current could, but rarely does, heat up the coil, but it's high voltage which often heats up the core.  At low power (and therefore low VSWR voltage) it wouldn't necessarily be a problem, but at high power it easily

Re: [Elecraft] K3s Internal noise on 160 meters

Good Morning, I'm experiencing internal noise on my K3s. It is not quite 1 year old. I have disconnected everything from the radio and operating off of a battery and the problem is still there. The preamp is off. It doesn't matter if antenna one or two is selected but if the rx antenna is

[Elecraft] 2 different 144MHz transveters and CAT selection

Why not use the command “BN $” ?? This is a GET/SEL command, and has VFO select options. Reference Programmers manual. “BN 16” selects XVERTER 1 “BN 17” selects XVERTER 2 73 de Ben W4SC Sent from Mail for Windows 10 __

Re: [Elecraft] my KPA1500 and 160M

Overheat is a situation taking time, and usually starts with a good match, then deteriorating. In this case ; "But when I throw the KAP1500 in line, it gets all pissed off, throws up and faults out.  Says SWR is 99:1 !!!" indicating an instant issue while the balun is still stone cold...

[Elecraft] 2 different 144MHz transveters and CAT selection

I have an unusual situation in that I have 2 different 2m transverters attached to my K3S. One system is a dual channel ME2T-XP and uses the SUB RX, this is only used for EME and it designated XV1. The second is used on tropo/terrestrial DX and contests and is an ME2T-ProII, this is XV2. If

[Elecraft] K3 HAS BEEN SOLD

Thanks __ 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 email

Re: [Elecraft] my KPA1500 and 160M

I would agree that the coil could overheat. The model number is left out. The Balun Design coil chosen may not be satisfactory for your power despite the 5KW rating. Which Balun are you using? Bill K9YEQ -Original Message- From: elecraft-boun...@mailman.qth.net On Behalf Of David

[Elecraft] K4 Shipping?

Not to be a curmudgeon, but don't you suppose they built at least this many for testers? -- 73, Pete N4ZR Check out the Reverse Beacon Network at , now spotting RTTY activity worldwide. For spots, please use your favorite "retail" DX cluster.

Re: [Elecraft] my KPA1500 and 160M

Perhaps it's more to do with the common mode impedance that these transformers/choke present. Is the 4:1 a true Guanella or a Ruthroff or ? David G3UNA > On 02 September 2020 at 00:27 Rick NK7I wrote: > > > If you model it accurately, you see that a 4:1 transformer will cause most >