Re: [Elecraft] Using the K3s Tune button causes a growing SWR on my KPA500

Hello Andy The main reason I abandoned small transmitting loops was their susceptibility to temperature variation, one cause being power input, the other due to instantaneous change when the sun comes out. Apologies for sliding off topic. David G3UNA > On 17/07/2022 16:38 Andy Durbin

Re: [Elecraft] What is a reasonable turnover time to hear from Elecraft support:

Thanks for the note, Jim, I'll ask for advice. 73 David G3UNA > On 15 June 2022 at 16:41 N4ST - Jim wrote: > > > For some reason, your email and a couple others recently are showing up as > [SPAM] > ??? > __ Elecraft mailing list

[Elecraft] What is a reasonable turnover time to hear from Elecraft support:

I answered this today and the response from the reflector came in blank. This happens from time to time: I don't know why or how to fix it. My answer was: I posed a question last week and got a response from Elecraft support within a day. 73 David G3UNA

Re: [Elecraft] What is a reasonable turnover time to hear from Elecraft support:

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Re: [Elecraft] De-soldering Tool Recommendations?

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Re: [Elecraft] De-soldering Tool Recommendations?

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Re: [Elecraft] De-soldering Tool Recommendations?

Steve Great idea: did you use self-fluxing enamel wire? This is common on small gauges used in signal circuits but not so common on large gauge wire used in power transformers that I recall. David G3UNA > On 21 March 2022 at 14:38 SteveL wrote: > > > As a valuable side note, the Hakko 808

Re: [Elecraft] Knowles HC-3 Mic Element Replacement For Heil HC-5

Expensive: 20 years ago when I started working with Knowles mic elements for Mil headsets they cost the firm GBP15 each in lots of 20k. One of the main criteria was reliability. I recall the output was 100mV with a standard close-coupled tone on the face of the capsule. The instruction to the

Re: [Elecraft] De-soldering Tool Recommendations?

With all desoldering tools it's important to *regularly* clean the inside of solder debris. David G3UNA > > > On 14 Mar 2022, at 05:06, Tony <73gu...@gmail.com> wrote: > > > > All: > > > > Can anyone recommend a budget de-soldering iron that can be used in tight > > places? I need to

Re: [Elecraft] Cleaning Solder Flux, Redux

Ted If the residue is clear, don't bother, you might create more damage than you realise (ESD). If the residue is brown, you've been using the wrong solder. If you really feel the desire for aesthetics then you can can brush it with IPA, but beware ESD if there are sensitive components on

Re: [Elecraft] Stripping & Tinning Enameled Wire - Fast, Easy, Reliably

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Re: [Elecraft] K3 Auto ATU Problem

> Tom G3OLB > > On Tue, 7 Dec 2021 at 12:21, CUTTER DAVID < d.cut...@ntlworld.com > mailto:d.cut...@ntlworld.com > wrote: > > > > Tom > > > > I've found that pressing tune again, immediately after a tune > > sequence set

Re: [Elecraft] K3 Auto ATU Problem

Tom I've found that pressing tune again, immediately after a tune sequence sets it off to do "fine tuning" which might help. David G3UNA > On 07 December 2021 at 11:59 Tom Boucher wrote: > > > Thanks NK7Z, NK7I and K8CN for responses. > > Dave and Rick indicated that running the K3 at a

Re: [Elecraft] Problem Tuning K3: now off centre fed dipole

that antenna to really work and understanding > it better, helps. > > 73, > > Chuck K0MV > > > On 11/4/21 9:59 AM, CUTTER DAVID via Elecraft wrote: > > Hi Dan > > > > Good question. I'll answer as a non-expert as best I can. > > > > This is esse

Re: [Elecraft] Problem Tuning K3: now off centre fed dipole

Hi Dan Good question. I'll answer as a non-expert as best I can. This is essentially a quest for a multi-band dipole that is easy to make and use. If you can put up mono band dipoles and beams for all your bands, you probably will not bother going this route. The popular description of

Re: [Elecraft] Problem Tuning K3

on a decent ocf dipole and see for yourself. Great progress has been made in the last few years and, yes I use your cookbook. David G3UNA > On 02 November 2021 at 19:09 Jim Brown wrote: > > > On 11/2/2021 11:50 AM, CUTTER DAVID wrote: > > Don't stay stuck in the past: n

Re: [Elecraft] Problem Tuning K3

Jim Don't stay stuck in the past: not all ocf dipoles are created equal. With properly designed transformers and chokes, the common mode current can be tamed to perfectly decent levels. David G3UNA > On 02 November 2021 at 18:25 Jim Brown wrote: > > > On 11/2/2021 6:15 AM, Bill via

Re: [Elecraft] Problem Tuning K3

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Re: [Elecraft] KAT500/KPA500 with IC-7610?

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Re: [Elecraft] Band pass filters

dio to prevent its phase noise from being > > heard on other bands. Just pressing PTT on the TX radio, even without > > putting out any measurable power, will raise the noise floor on multiple > > bands. With suitable band decoders driving filter selection, > > fast-s

Re: [Elecraft] Band pass filters

ly a short time owning a Flex 6600M that had “state > of the art” internal filters. Reading the Flex manual seemed to suggest that > all bets are off when power exceeds 100w and you want to transmit on one port > and listen on another. > > Paul > W6PNG/M0SNA > www.nomadic.blog &

[Elecraft] Band pass filters

Given the improved performance of modern transceivers, is there still a call for high specification W3NQN band pass filters in a 2-transmitter station? For example on a Multi-2 contest environment. For instance K3S + KPA + KAT. The filter fitted between radio and amplifier. I have the

[Elecraft] Bandpass filters

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Re: [Elecraft] Question about antenna matching

You might find some answers here: https://www.dj0ip.de/antenna-matchboxes/ On the next page he shows all the results from published data. David G3UNA > On 14 July 2021 at 07:29 Julia Tuttle wrote: > > > That doesn't actually answer the question "what are manufacturers measuring > when they

Re: [Elecraft] P3 frequency Display

According to my calculations on MIL217 connectors are the least reliable of all components from memory David G3UNA > On 10 June 2021 at 17:17 lmarion mailto:lmar...@mt.net > > wrote: > > > retried FAA electronic tech, I have fixed by far more by repluging or > reseating a card or

Re: [Elecraft] KPA500 receive loss

Would a gas discharge tube save the sensitive parts? David G3UNA > On 05 June 2021 at 16:20 "Dr. William J. Schmidt" wrote: > > > This happened with my backup amp at the contest station on J6. I left it > connected by accident overnight (too much rum) and we had some static > storms. Took

Re: [Elecraft] K3 - Maximum CW speed from manual key

Funny how things move around: back in 1914-15 they could do 300wpm on spark transmitters and regularly worked 200wpm with 15kW stations up and down the west coast USA. It wasn't said as such but we know it as FSK. Machine to machine. Plus ca change... David G3UNA > On 06 February 2021 at

Re: [Elecraft] K3 - Maximum CW speed from manual key

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Re: [Elecraft] Reaching across the chronological divide

There was indeed a Loudenboomer made by a Brit back in the 60s / 70s and I think it was G3TPW Steve Webb who moved on to make the Cobwebb antenna. David G3UNA > On 04 January 2021 at 13:14 Louandzip via Elecraft > wrote: > > > "Where ignorance is bliss, 'tis folly to be wise." ? > On

Re: [Elecraft] [K3] Wetting current and CW paddles

Sliding off topic a little: in designing some outdoor industrial control equipment I was required to use some chunky, robust push buttons that were good for high voltage, high current but no good at 12V. Getting to logic level I had to build in a lot of extra current from 12V to ensure a good

Re: [Elecraft] Cheap keyer paddle?

There is a new manufacturer advertising in Sprat magazine. Model UMPP-1 is advertised bench model and there are others $60 to US. Not quite "cheap" but very small and good for travelling. www.umpp-cw.com gm0...@gmail.com 73 David G3UNA/G6CP > On 18 September 2020 at 08:36 David Gilbert

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

core choke, so I'll take a look at the new info. 73 David G3UNA > On 03 September 2020 at 17:05 Jim Brown wrote: > > > On 9/3/2020 4:21 AM, CUTTER DAVID via Elecraft wrote: > > I use K9YC-style chokes, eg several turns on 240-31 core, or, if it's > > really bad, seve

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

Ronnie You might try measuring the common mode current on your coax feed in various places, just a cheapo RF current meter clamped over the coax. That will tell you if the chokes you are using are doing their job. I know for sure that cmc causes considerable distortion of swr curves. Any

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 >

Re: [Elecraft] KAT 500 for sale

I would like that, would you sell outside USA? David G3UNA > On 21 August 2020 at 13:09 Howard Sherer mailto:h...@lehigh.edu > wrote: > > > I have a like new KAT 500 for sale. $500. plus shipping from 18104 > > Howard AE3T >

Re: [Elecraft] New antenna works!

Jim and Dave Let's start with Kevin KD5ONS and his 40m vertical. A great monobander and I'm sure it performs very well on that band. He tells us it works great on most other HF bands as well, using the wonderful Elecraft matching ability. Had he stayed with that one antenna on that one band

Re: [Elecraft] New antenna works!

Dave You read something into my post that was neither there nor intended. This highlights one of the oddities of emails: you can't write them to fit all audiences. David G3UNA > On 01 August 2020 at 20:12 David Gilbert wrote: > > > > For what it may be worth, I'm a staunch supporter of

Re: [Elecraft] what tripod to use?

n > Washoe County > > On 7/31/2020 4:27 PM, Phil Kane wrote: > > On 7/31/2020 2:26 AM, CUTTER DAVID via Elecraft wrote: > > > >> A cheap and exceedingly sturdy tripod is a re-cycled/re-purposed rotary > >> washing line. > > With all due res

Re: [Elecraft] New antenna works!

reason why an antenna properly > designed for a particular band is a bad idea. > > Dave   AB7E > > > > On 7/31/2020 2:04 AM, CUTTER DAVID via Elecraft wrote: > > With Elecraft matching units you don't need (and it can be undesirable to > > have) antennas made f

Re: [Elecraft] what tripod to use?

A cheap and exceedingly sturdy tripod is a re-cycled/re-purposed rotary washing line. Remove the line for other things, eg guys and turn it upside down. Peg the legs if it's windy. Make/buy a clamp for your antenna pole. I used this with a screwdriver antenna and a few radials on the

Re: [Elecraft] New antenna works!

With Elecraft matching units you don't need (and it can be undesirable to have) antennas made for a particular band. You make life easier for the matching unit by making your antenna non-resonant on bands you want to use. That way the unit does not have to cope with especially high voltages

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

Skip Was any attempt made to redress the imbalance? David G3UNA > On 17 July 2020 at 03:19 Fred Jensen mailto:k6...@foothill.net > wrote: > > > They were around somewhat before the patent in several forms, and they > were around in 1960, which is the last time I looked hence my

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

G3UNA > On 16 July 2020 at 04:26 Jim Brown wrote: > > > 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

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

for courses. A properly designed choke for an ocfd will not over-heat but these are few and far between it seems. David G3UNA/G6CP > On 15 July 2020 at 21:07 Jim Brown wrote: > > > On 7/15/2020 11:46 AM, CUTTER DAVID via Elecraft wrote: > > Ferrite-cored chokes (balun) heat up a

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

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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] Difference in dummy loads

Buyer beware. I bought a superb, almost new, almost unused Bird 8141, in its original box and it failed after a short while. Taking it apart it was obvious that it had been well and truly cooked. It must have been hammered. The main connection had corroded and separated from the element.

Re: [Elecraft] Using P3 Remotely

Wayne did this at Visalia but I've forgotten how he did it. I recall he used a little laptop. David G3UNA/G6CP > On 09 June 2020 at 04:20 Ken Widelitz wrote: > > > Is anyone using a P3 remotely? If so, how? What is the bandwidth required? > > 73, Ken, K6LA / VY2TT >

Re: [Elecraft] Spkrs+Ph ?? K3

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Re: [Elecraft] KPA500problem - Half output power

Bob I'm steering slightly off course and I feel I must come in: I presume that during the manufacturing process, the amplifier goes through a production process to set up the indicators using a lab quality load and modern, lab quality power meter, regularly calibrated. I have a Bird with

Re: [Elecraft] KATxxx Remote Tuner

For those with antennas that are "nearly right," eg provide <1.5:1 in a sweet spot but not the entire band, like a beam or a dipole, a commercial matcher that covers a huge range is not justified. A simple multi-tapped transformer would satisfy those needs. A relay-switched unit should be

Re: [Elecraft] Electrolytic Capacitor failure

Hello Gill Doing reliability calculations to MIL 217 was very instructive many years ago and it taught me that operating well under the limits extended MTBF a lot. Some military customers instructed that specs were 60% or more degraded to achieve longer service life. What was your experience

Re: [Elecraft] Ameritron 240V inrush limiter: any benefit on a KPA500?

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Re: [Elecraft] Tony CW transceiver for socially isolated kids

Eric I've watched kids use Morse practice oscillators of the simplest kind (we made a kit for <£3 including the key) and they are absolutely taken by it. I don't think they compare their cell phones with this system at all. We do because we are aware of the technology, but kids see things

Re: [Elecraft] Looking for volunteer to design a tiny CW transceiver for socially isolated kids/teens

Wayne was looking for 1mW output. How does that equate in regard to the regs? David G3UNA > On 18 October 2019 at 22:58 Fred Jensen wrote: > > > If they're unlicensed, they will be intentional radiators subject to > 47CFR15 Subpart C [15.201 et seq] which imposes field strength limits >

Re: [Elecraft] KX2 Antenna Curiosity

I'd like to suggest that one very good reason for using centre-fed and external matching unit is because the harmonic pickup from nearby stations is much reduced compared to multi-band antennas. This is best implemented when the antenna is as near perfectly balanced as possible to avoid

Re: [Elecraft] Dummy Load recommendation

s automatically do that > compensation because you cannot read the meter scale with 4 digit > accuracy. Even my 12 inch slide rule in college was limited to 3 > significant digits. > > There is a difference between doing it "good enough" and with greater > accuracy depend

Re: [Elecraft] Dummy Load recommendation

t; >> > >> 100 watts into 50 ohms is 70.71 volts > >> > >> 100 watts into 55 ohms is 74.16 volts > >> > >> 100 watts into 45 ohms is 67.08 volts > >> > >> 73 > >> > >> Bob, K4TAX > >> > >> >

Re: [Elecraft] Dummy Load recommendation

I often wonder just how useful a precision dummy load really is in the amateur service. I picked up home brew dummy load at the club the other day. It measured 57ohms dc and comprises 4 wire-wound resistors attached in a cluster across the end of the coax. After lots of disparaging remarks I

Re: [Elecraft] Visalia?

a patent on it but it was a very neat package. David G3UNA > On 17 April 2019 at 16:41 CUTTER DAVID via Elecraft mailto:elecraft@mailman.qth.net > wrote: > > > > __ > Elecraft mailing list > Home

Re: [Elecraft] Visalia?

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Re: [Elecraft] Visalia?

ril 2019 at 03:28 Fred Jensen wrote: > > > And, the outcome of the conversation was??? > > 73, > Fred ["Skip"] K6DGW > Sparks NV DM09dn > Washoe County > > On 4/15/2019 5:22 PM, CUTTER DAVID via Elecraft wrote: > > I had a nice chat with Eric talking

Re: [Elecraft] Visalia?

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Re: [Elecraft] Visalia?

I had a nice chat with Eric talking about remoting the P3 David G3UNA > On 15 April 2019 at 23:01 Barry Baines via Elecraft > wrote: > > > Bill: > > > On Apr 15, 2019, at 12:18 AM, Bill Frantz wrote: > > > > No. There were the usual show special deals and the KPA1500 was emphasized. > >

Re: [Elecraft] K2 to the field

I used a large sandwich box which held it very well indeed. Then it can be popped into your ruck sack without further ado. David G3UNA > On 21 March 2019 at 17:24 Frank Krozel wrote: > > > Always protect the front! > de KG9H > > > > On Mar 21, 2019, at 12:23 PM, Bryan Nehl wrote: > > > >

Re: [Elecraft] Urban stealth HF: Inside-the-backpack loop antenna?

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Re: [Elecraft] Urban stealth HF: Inside-the-backpack loop antenna?

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Re: [Elecraft] Less Than Perfect Antennas [was Flumoxed]

The most extensive measurements of real live dipoles using chokes and baluns has been done by Rick DJ0IP. He made hundreds, if not thousands of measurements with asymmetric dipoles. He measured common mode current with the feeder straight down, off-centre and reversed on several bands to test

Re: [Elecraft] OT: G5RV antenna

Sorry, I said Reg, should have said Louis David G3UNA > On 09 December 2018 at 16:30 CUTTER DAVID via Elecraft > wrote: > > > In addition, Reg was designing in the era of valve output transmitters with > built-in pi-tank matching system, so, it was possible to match on

Re: [Elecraft] Noise-cancelling headphones mystery

Noise cancelling that I've come across is limited to low/medium frequencies. If your hearing takes you higher, the noise-cancelling has finished by then. This is probably not the ability of the sensing mic but the circuitry and/or room acoustics, echo, etc. I'm a little out of date on the

Re: [Elecraft] OT: G5RV antenna

In addition, Reg was designing in the era of valve output transmitters with built-in pi-tank matching system, so, it was possible to match on different bands. I'm sure mine worked across 80 to 10m in those days. For 80 to 10m these days I use a off-centre-fed dipole with hybrid

Re: [Elecraft] OT: Protecting Toroidal Cores

Would a simple dip in varnish do? David G3UNA > On 02 May 2018 at 12:35 Charlie T wrote: > > > Yeas, but it's a destructive test, like checking the opening current for a > fuse. > I would guess that any core, whether ferrite or powdered iron would be > subject to some water

[Elecraft] PSU cable (was Astron psu..)

I have used twisted thick wires to encourage magnetic cancelling as recommended by Jim Brown. The twisting also makes the cable easier to manipulate. I used 2 cores rescued from scrap household cable. David G3UNA > > On 11 April 2018 at 17:02 "j...@kk9a.com" wrote: >

Re: [Elecraft] [K3] Using K3 for relative noise survey

Yes, I already sent a message to Chris, hope he fixes that soon David G3UNA > > On 04 August 2017 at 17:45 Wes Stewart wrote: > > > They should fix some links on this site. > > On 8/4/2017 2:26 AM, David Cutter via Elecraft wrote: > > Apologies for

Re: [Elecraft] Antenna Question

I bought a batch of Barenco 259s amongst others and I am mightily impressed, very chunky, very smooth and not expensive. David, G3UNA > > On 11 October 2016 at 22:50 Dave G3WGN M6O wrote: > > > Not oddball in EU, nor expensive. Good quality ones are available from

Re: [Elecraft] Balun suggestions

DJ0IP must be one of, if not the post prolific testers of baluns and chokes *attached to aerials* ever. He does not measure them in the lab. His measurements are practical and done with rigour using modest equipment. He has done thousands of measurements for common mode current, only a fraction

Re: [Elecraft] Recording CQ WW CW and SSB

A modestly priced stereo voice recorder that I use for other things (Olympus WS-812) could easily do a 48 hour contest. Held in a wooden jig with an ear bud adjacent each mic it will do a good job. The thing it lacks is a quick way to search. Over 48 hours there would be some timing error in

Re: [Elecraft] K3S Proper Grounding

I think we are drifting off topic, my apologies, but if you are considering an ocf dipole you can only prevent common mode currents by use of a double wound balun, ie 2 separately made chokes connected together as a 4:1. A single core version does not properly cancel the common mode current that

Re: [Elecraft] KX1 - We need to develop the ideal antenna

I can understand this in a home situation, but for use with a very lightweight, low bulk portable rig like a KX1 I would use something like 16/0.2, (16 strands of 0.2mm copper, similar to 14/0076). I wouldn't for instance hang flexweave from a floppy fibreglass pole, but I've done it with this

Re: [Elecraft] KX1 - We need to develop the ideal antenna

This is what we used to call the shirt button antenna 'cos we used shirt buttons as the insulators which saves and awful lot of work making them. For light weight I would consider 300ohm ribbon for the feeder and a simple choke/balun to the connector. Crock clips rust in our wx and slide switches

Re: [Elecraft] [P3] another idea

I might have missed it, but this would go with peak hold while you are away from the desk David G3UNA On 7 September 2010 11:38, Bill W4ZV btipp...@alum.mit.edu wrote: Frank R. Oppedijk-2 wrote: I also use the SPAN feature very much. I have it often set to wide for checking out whether

Re: [Elecraft] BL2 choking Impedence measurements?

Ian Our friends over the pond (K9YC etc) extoll the virtues of type 31 material but I have yet to see this in European stocks, (I was disappointed to see none at Friedsn) do you know of an easy source? Reading through your latest choke missive, I notice that nice obround shaped core from