Re: [Elecraft] KPA1500 in the IARU Contest Last weekend

On 7/15/2020 1:36 PM, CUTTER DAVID wrote: It's all about size.  Bigger core helps, Dave, No, it is NOT about size. It is about design of the entire antenna system, including the antenna, the feedline, and other parts needed to make the SYSTEM work. The principal characteristic of a common

Re: [Elecraft] Waterproof SO-239 covers

I'm a big fan of rescue tape too.  No adhesive and cuts away very easily with a sharp blade.Home Depot sells a version:Nashua Tape 1 in. x 3.33 yd. Stretch and Seal Self-Fusing Silicone Tape in

Re: [Elecraft] Waterproof SO-239 covers

American Radio Supply sells metal covers that thread onto SO-239, and have a soft rubber insert. I have been using them on outdoor connectors for years now, and they work well... 73, and thanks, Dave (NK7Z) https://www.nk7z.net ARRL Volunteer Examiner ARRL Technical Specialist ARRL Asst.

Re: [Elecraft] Waterproof SO-239 covers

I would use Coax Seal. Same idea as duct seal but it's more pliable, more wx resistant and a little stickier. It will last forever, never hardens and can be peeled off when needed. Might want to screw pl-259 shells onto the socket threads first, then seal them. The sockets & shells will be

[Elecraft] ISO KX-1

Looking for all bands. If I locate one, I’ll sell mine with 40,20 a 30 mtr board and tuner. Please advise, Paul WA6YCA Tnx __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help:

Re: [Elecraft] Waterproof SO-239 covers

First prepare an old PL-259 like Gary K9GS said. Then go shopping in the plumbing area — not in electrical — and buy Rescue Tape. It stretches around that PL-259 to seal it up and sticks to itself rather than to the connector. Be careful because you won’t be able to unwind it but will peak away

Re: [Elecraft] Waterproof SO-239 covers

Hi Doug,I've never done this but why not take a PL259, fill it with RTV or epoxy, let cure, install on the SO239, and then weatherproof like you would normally do?73,Gary K9GS Original message From: Doug Daniels Date: 7/15/20 4:04 PM (GMT-06:00) To: Elecraft Reflector

Re: [Elecraft] Waterproof SO-239 covers

I wrap some duct seal putty around mine. Get it at Home Depot for cheap. Works fine. I forget what I paid, around $2-3 for a brick of it I think. Stays soft and pliable. 73 de Tom - KB2SMS On 7/15/20 7:39 PM, Nate Bargmann wrote: * On 2020 15 Jul 16:07 -0500, Doug Daniels wrote: I just

Re: [Elecraft] Waterproof SO-239 covers

* On 2020 15 Jul 16:07 -0500, Doug Daniels wrote: > I just built a window antenna feedthrough panel, and want some waterproof > covers for the unused bulkhead connectors. Most of the online reviews say > that even the ones advertised to be waterproof are in fact not waterproof. > Anyone have a

Re: [Elecraft] Waterproof SO-239 covers

Doug not knowing if you are looking for commercial solutions or McGyver ideas. I would think that old rubber hose pieces that fit snug or close held on with hose clamps should work. The end opposite the feed thru could be sealed with silicone or left open if a few inches from the wall. I have

Re: [Elecraft] KPA1500 in the IARU Contest Last weekend

Size is the most important parameter. I've read your tutorials several times and they are an inspiration but it's just like linear amplifiers: you can't say an amplifier designed for intermittent service like ssb or cw is poorly designed because it doesn't pass the BOK test. It's horses for

[Elecraft] Waterproof SO-239 covers

I just built a window antenna feedthrough panel, and want some waterproof covers for the unused bulkhead connectors. Most of the online reviews say that even the ones advertised to be waterproof are in fact not waterproof. Anyone have a source for ones that are? -- --... ...-- Doug

Re: [Elecraft] KPA1500 in the IARU Contest Last weekend

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Re: [Elecraft] KPA1500 in the IARU Contest Last weekend

On 7/15/2020 11:46 AM, CUTTER DAVID via Elecraft wrote: Ferrite-cored chokes (balun) heat up and change apparent swr. Not if they are properly designed and properly applied. And not all antennas can be choked -- in general, only resonant antennas can be effectively choked. Chokes applied to

[Elecraft] [WTB] Late-model bare bones K3 or K3S with SUB

I'm looking for a clean bare-bones 100W K3 or K3S with SUB, serial number 8000 or higher, with or without the new synth boards, no added filters, no add-ons. Thanks & 73, Dick WC1M __ Elecraft mailing list Home:

Re: [Elecraft] Fwd: Re[2]: K2 7747 VCO alignment problem

I made an error in checking K14 and K15 while on 80 meters. It should have been conductivity between pins 2 and 3 and open between pins 3 and 4. The state of the other side was correct - continuity between pins 8 and 9 and open between 7 and 8. 73, Don W3FPR

Re: [Elecraft] Matching resonant antennas

Yes, a resonant half wave dipole can have a feedpoint impedance of 5 ohms to 90 ohms (SWR 10:1 to 1.8:1), but it's still resonant. Conversely, a non-resonant antenna can have a 1:1 SWR. Ken WA8JXM On Wed, Jul 15, 2020 at 12:34 PM Andy Durbin wrote: > "A correspondent asked me why I needed to

Re: [Elecraft] Fwd: Re[2]: K2 7747 VCO alignment problem

Keith, C74 could explain a problem on 30, 20, and 12 meters, but you apparently have something else awry. If you do not find a problem with the relay coils, you should next check the contacts of relays K13, K14 and K15. On 20 meters, all the relays should be set - meaning you should have

[Elecraft] KXV3 GAP1

Hello, I burned out GAP1 on KXV3 board, too much RF, hi. What is this component? Overvoltage? Need to know to chage it. Tnx. juha oh6os -- Sent from: http://elecraft.365791.n2.nabble.com/ __ Elecraft mailing list Home:

[Elecraft] K3/0 Mini and Win4K3 -- digital remote operation

I am posting this message on the Remoterig forum as well as sending it to Elecraft (and anywhere else I can think of) to try to make some headway. In short: I wish to operate digital modes from my control station to my remote station using K3 Twin mode of Remoterig setup (K3/0 Mini and K3

Re: [Elecraft] KPA1500 in the IARU Contest Last weekend

Ferrite-cored chokes (balun) heat up and change apparent swr. David G3UNA/G6CP > On 15 July 2020 at 17:36 j...@kk9a.com wrote: > > > That is quite an assumption. A 2el 40m beam with large efficient > High-Q loading coils will have less bandwidth than for example one of > the popular US

Re: [Elecraft] Matching resonant antennas

The obvious issue is not what the radio sees... It's what can happen on the other side of the transform. Voltages and currents that no one seems to care about as long as their radio sees 50 ohms. Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ -Original

Re: [Elecraft] KPA500 and VSWR

Good point, Andy. I never thought to use the complex impedance measurement capability of the LP-100A to see what the exact load impedance was with the old configuration.  If I have occasion to do any modifications on my 20-15-10 dipole, I'll try to remember to document the before and after

Re: [Elecraft] KPA1500 in the IARU Contest Last weekend

That is quite an assumption. A 2el 40m beam with large efficient High-Q loading coils will have less bandwidth than for example one of the popular US manufactured beams that use 68 turns of small wire in each coil. The latter is more likely to have heating issues. I have never noticed

[Elecraft] Matching resonant antennas

"A correspondent asked me why I needed to tune a resonant antenna." Perhaps the question should have been "why may you need to match the impedance of a resonant antenna". The answer may be that not all resonant antennas are 50 ohm. Resonance only means that inductive and capacitive

[Elecraft] KPA500 and VSWR

"With the lower VSWR, I never saw the PA temperature exceed 50°. I suppose this shouldn't come as a surprise, but it does show the PA heating effects of even moderate load mismatches on a solid state amplifier designed for a 50 Ohm load. Just an anecdote that some may find interesting." I

Re: [Elecraft] KPA1500 in the IARU Contest Last weekend

Since it is so narrow I suspect it may be a trapped design or have loading coils which at 1500w may be heating and detuning as a result. 73 jim ab3cv On Wed, Jul 15, 2020 at 11:45 AM Ray Spreadbury via Elecraft < elecraft@mailman.qth.net> wrote: > > > A correspondent asked me why I needed to

[Elecraft] KPA1500 in the IARU Contest Last weekend

A correspondent asked me why I needed to tune a resonant antenna. The reason was because although the Yagi was tuned to resonate at about 7.130MHz it unfortunately has a rather narrow bandwidth. I needed to operate SSB in this contest in ITU Region 1 SSB, which is between 7.080MHz and

Re: [Elecraft] KPA1500 in the IARU Contest Last Weekend

Or water... Are you sure your coaxial cable, balun and connectors are all dry? From your description, the last thing I'd examine is the KPA1500 Good luck! 73 Frank W3LPL On Wed, Jul 15, 2020 at 11:19 AM Nr4c wrote: > My first thought is “Heat”! > > > Sent from my iPhone >

Re: [Elecraft] KPA1500 in the IARU Contest Last Weekend

Describe your antenna system. Jim ab3cv On Wed, Jul 15, 2020 at 11:19 AM Nr4c wrote: > My first thought is “Heat”! > > > Sent from my iPhone > ...nr4c. bill > > > > On Jul 15, 2020, at 4:43 AM, Ray Spreadbury via Elecraft < > elecraft@mailman.qth.net> wrote: > > > > Hi > > > > I was a member

Re: [Elecraft] KPA1500 in the IARU Contest Last Weekend

My first thought is “Heat”! Sent from my iPhone ...nr4c. bill > On Jul 15, 2020, at 4:43 AM, Ray Spreadbury via Elecraft > wrote: > > Hi > > I was a member of the UK HQ team for this 24hour IARU event last weekend and > was one of the two Ops on 40M SSB. > > We took it in turns to be

Re: [Elecraft] Calibrating RX on the K144XV

Hi Randy I used to own the 144XV and yes, it was off frequency with no way to actually tune the actual transverter. I actually did add a GPSDO for a reference that helped. Next, it drifted all over the place. So, to answer your question, yes, this is normal. Mike va3mw On Wed, Jul 15, 2020

Re: [Elecraft] KPA-1500, too?

Why ?  I may have missed something, but my KPA-1500 seems to display all of the same info simultaneously. 73, Pete N4ZR Check out the Reverse Beacon Network at , now spotting RTTY activity worldwide. For spots, please use your favorite "retail" DX cluster. On

[Elecraft] KPA500 and VSWR

I just finished the 1300Z session of the CWops CWT and thought I'd pass on an observation on the KPA500. When I'm operating in contest mode, one of the things I like to keep an eye on is the KPA500 PA temperature, as monitored via WIN4K3. (WIN4K3 manages the multiple connections for CAT data

[Elecraft] Calibrating RX on the K144XV

Hi all, I have recently installed a K144XV in my K3s. From the factory, the offset value in the lower part of the band is +3.29 however, I tune into the Beam Spinner’s net every morning here in the Denver area on 144.200 however, with the factory recommendation, I have to tune 144.199.75 to

[Elecraft] KPA1500 in the IARU Contest Last Weekend

Hi I was a member of the UK HQ team for this 24hour IARU event last weekend and was one of the two Ops on 40M SSB. We took it in turns to be the Run station every 4 hours and I was using a 40M 2-El yagi at 60ft. I noticed that every 30-60mins, I needed to do a re-tune on the KPA1500 to keep the

Re: [Elecraft] Elecraft K2 CW key shaping

Hi, thanks for the hints and information. I will listen to the signal once with my K3. That seems to be the best way to check the hint. But I will also have a look at the connector plugs and power supply cables in my portable configuration. 73, Wolfgang DL2KI -- Sent from: