Re: [Elecraft] KX3 Field Ant. for 80/40/30

End-fed antennas have gotten popular lately. When I look closer I see two different popular approaches. The first uses a 9:1 impedance transformer in combination with a wire length that is not resonant on any band. The idea is that (assuming there is no significant feedline length) you have a med

Re: [Elecraft] O.T. Morse is not dead, at least in the U.S. Navy

On 18/11/17 03:45, Ron D'Eau Claire wrote: > http://www.navy.mil/submit/display.asp?story_id=92864 The people being trained by the US Navy to read Morse are intercept operators. "Morse code is just one tool that cryptologic technician (collection) Sailors use as members of the Navy's Information

Re: [Elecraft] O.T. Morse is not dead, at least in the U.S. Navy

On 18/11/17 05:43, Mark via Elecraft wrote: > Re:  http://www.navy.mil/submit/display.asp?story_id=92864 > > So, "The rumors of my death have been greatly exaggerated"??? No, unfortunately for the CW evangelists, they haven't been. The rumor that *is* being greatly exaggerated is that the US Na

Re: [Elecraft] KX3 Field Ant. for 80/40/30

Very useful post Erik, Thank you 73, Igor UA9CDC 19.11.2017 13:22, Erik Basilier пишет: End-fed antennas have gotten popular lately. When I look closer I see two different popular approaches. The first uses a 9:1 impedance transformer in combination with a wire length that is not resonant on

[Elecraft] P3 with SVGA

I just assembled the P3 kit which includes the SVGA adaptor and the TX monitor. In the original instructions, there’s a warning not to use the P3 with SVGA adaptor, taking power from the K3’s 12 volt output. However, there’s a reference to the 1 Amp K3 modification in a later full manual for the

Re: [Elecraft] P3 with SVGA

Alan, Look at the label on your K3 12 volt output jack. Does it say 0.5 amp or does it say 1.0 amp? The 12v change includes a sticker to re-label the jack. Yes, you could use a "Y" adapter, but use a good quality one so you don't have a significant voltage drop due to loosely fitting conne

Re: [Elecraft] P3 with SVGA

Hi Don. Thanks for the info. I performed the 1 Amp mod on my K3 myself, so I'm quite sure it's 1A capable and yes it does have the 1A label. I'll look for a quality adapter. As they're normally meant for audio work, I was a little concerned that the internal wiring might only be intended to

Re: [Elecraft] P3 with SVGA

I use a "Y" adapter to power my P3 (no VGA) and W2 watt meter from the K3 12V output.  Before upgrading to the KXV3B, I used 2 "Y" adapters to power the 6M pre-amp as well and never had any problems. Mike, KI0HA On 11/19/2017 06:15, G4GNX wrote: Hi Don. Thanks for the info. I performed the

[Elecraft] KX3 Field Ant. for 80/40/30 Alternative to wire

I've used a narrow steel surveyor's tape as antenna. You can get them quite cheaply on Amazon etc and they have two advantages - they roll up very neatly and have the length of the antenna clearly written as you pull them out. It is easy to solder little bit of flexible wire for connections

Re: [Elecraft] KX3

Are his filters centered? A filter offset might cause him to tune off freq. Sent from my iPhone ...nr4c. bill > On Nov 18, 2017, at 7:23 PM, Mike Harris wrote: > > Hi, > > We have a visitor at another QTH. He is using a KX3. At present he seems to > have a problem. > > If he transmits on

[Elecraft] Re-Inventing the Tape Dipole

http://www.eham.net/articles/5523/ __ 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

Re: [Elecraft] KX3 Field Ant. for 80/40/30

Thanks for all the comments and suggestions. Some great info to mull over. N1ESE On Sun, Nov 19, 2017 at 6:36 AM, Igor Sokolov wrote: > Very useful post Erik, > > Thank you > > 73, Igor UA9CDC > > > 19.11.2017 13:22, Erik Basilier пишет: >> >> End-fed antennas have gotten popular lately. When I

Re: [Elecraft] KX3 Field Ant. for 80/40/30

If the wire is near an even multiple of 1/4 wave (1/2 wave, one full wave, 1 1/2 wave, etc.) then the impedance at the end of the wire is going to be very high. If the wire is near an odd multiple of 1/4 wave (1/4 wave, 3/4 wave, 1 1/4 wave) then the impedance will be low. If you're expectin

Re: [Elecraft] O.T. Morse is not dead, at least in the U.S. Navy

Maybe not, but having intercept operators learn Morse code implies that SOMEBODY is using it that the US military wants to listen to. So Morse code is not dead. Eric KE6US On 11/19/2017 1:24 AM, Richard Lamont wrote: On 18/11/17 03:45, Ron D'Eau Claire wrote: http://www.navy.mil/submit/disp

Re: [Elecraft] KX3 Field Ant. for 80/40/30

there is an End Fed Half Wave Antenna group on Facebook started up by N4LQ. it certainly promotes the EFHW fed with a 49:1 transformer. Steve loves the EFHW, but really does not have much love for 9:1 unun antenna. still, it is an interesting group to monitor. al ve3gam -

[Elecraft] Elecraft (and more) Items For Sale

I'm moving in 2018 and can't take these items with me.  Note that all prices include shipping to CONUS or Canada. 1.  Elecraft XV432 70cm transverter with optional crystal oven. Built by me.  Aligned & tested by Don Wilhelm W3FPR.  28 MHz I.F.  5W in, 20W out.  Can be reconfigured for other inpu

Re: [Elecraft] KX3 Field Ant. for 80/40/30

A useful post Erik. Also useful is the "pseudo end-fed" design that K9YC shows on starting at page 70. This design is really a center fed dipole using the outside of the feed line coax as one half of the dipole and an extension of the center conductor as t

[Elecraft] Adding Sub receiver in K3

Good evening all I have a K3 and want to add the sub receiver I have the new KSYN3A in my K3 but is my DSP board comparable? My DSP board in the K3 is rev C Mike VE3WDM __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinf

Re: [Elecraft] O.T. Morse is not dead, at least in the U.S. Navy

True ... however "someone" must be using Morse or there wouldn't be any communications to intercept. [:-)  Maybe the US Navy is intercepting us?  There was a recent URL posted involving using the venerable signal lamps for high speed communications between ships.  I don't think it was Morse how

Re: [Elecraft] O.T. Morse is not dead, at least in the U.S. Navy

True ... however "someone" must be using Morse or there wouldn't be any communications to intercept. [:-)  Maybe the US Navy is intercepting us?  There was a recent URL posted involving using the venerable signal lamps for high speed communications between ships.  I don't think it was Morse how

Re: [Elecraft] KX3 Field Ant. for 80/40/30

That group sounds interesting, thanks. 73, Erik K7TV -Original Message- From: VE3GAM [mailto:ve3...@rogers.com] Sent: Sunday, November 19, 2017 12:09 PM To: Erik Basilier ; 'JT Croteau' ; elecraft@mailman.qth.net Cc: Al VE3GAM Subject: Re: [Elecraft] KX3 Field Ant. for 80/40/30 there is

Re: [Elecraft] Adding Sub receiver in K3

The “c” board is fine. If you haven’t done it, you might want to add the LPF board to it (K3DSPLPF) — that will make it functionally equivalent to a “D” board. Not required, though. Grant NQ5T Sent from my iPhone > On Nov 19, 2017, at 3:52 PM, Mike Weir wrote: > > Good evening all I have a

Re: [Elecraft] Adding Sub receiver in K3

Mike, There is no mention of a specific level DSP board in the KRX3 installation manual, so it should work with any existing DSP board. 73, Don W3FPR On 11/19/2017 3:52 PM, Mike Weir wrote: Good evening all I have a K3 and want to add the sub receiver I have the new KSYN3A in my K3 but is m

Re: [Elecraft] KX3 Field Ant. for 80/40/30

Bill, I am aware of Jim's innovative way of achieving center feed while seemingly attaching the feeder to the end. It should be useful in some situations. However, the thread creator wanted coverage of 4 bands with one antenna, and my personal interest right now is also solutions that cover ser

Re: [Elecraft] KX3 Field Ant. for 80/40/30

Its easy to measure transformer loss by measuring the loss through a pair of identical transformers connected to back-to-back. The loss in a single transformer will be half of the loss through the back-to-back pair. 73 Frank W3LPL - Original Message - From: "Erik Basilier" To

Re: [Elecraft] Adding Sub receiver in K3

Thank very much for the fast feedback Mike VE3WDM -- 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:El

Re: [Elecraft] FS: K3DSPLPF

I will take it if still available? Mike VE3WDM -- 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:Elec

Re: [Elecraft] FS: K3DSPLPF

Mike, Order from Elecraft. K3DSPLPF - look in Spare Parts on the website. 73, Don W3FPR On 11/19/2017 6:50 PM, VE3WDM wrote: I will take it if still available? __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/e

[Elecraft] (OT) - Unplanned Discovery

Most people on this Reflector are well educated and intelligent.  Apparently, I'm the exception because this one got by me.  I'm only owning up to this in the hope that it might help someone else on the Reflector.  For the last couple of years I've been bothered by a high background noise lev

Re: [Elecraft] (OT) - Unplanned Discovery

Great story, Stan. Now you know why the K3/K3S/KX2/KX3 all have data modes you can use without a computer :) 73, Wayne N6KR > On Nov 19, 2017, at 4:23 PM, stan levandowski wrote: > > Most people on this Reflector are well educated and intelligent. Apparently, > I'm the exception because thi

Re: [Elecraft] (OT) - Unplanned Discovery

Wow. Going to try that. Thanks for this great post. On Sun, Nov 19, 2017 at 19:23 stan levandowski wrote: > Most people on this Reflector are well educated and intelligent. > Apparently, I'm the exception because this one got by me. I'm only > owning up to this in the hope that it might help

Re: [Elecraft] (OT) - Unplanned Discovery

I'm really surprised you had an issue with the KX33 supply. - JT On Sun, Nov 19, 2017 at 7:31 PM, rich hurd WC3T wrote: > Wow. > > Going to try that. Thanks for this great post. > > On Sun, Nov 19, 2017 at 19:23 stan levandowski wrote: > >> Most people on this Reflector are well educated and

[Elecraft] Elecraft CW Net Report

Good Evening,     The forty meter net just ended.  Conditions were a little noisy with various types of QSB.  From Alaska there was a flutter, from North Dakota there was none, and from California there was a slow, rolling wave (must be the surfer effect :).  Twenty meters had QSB too but fan

Re: [Elecraft] (OT) - Unplanned Discovery

Rich, You just discovered the problem with switching power supplies. I'm unaware of any computer power supply that isn't a switcher, but for most 12 volt needs an analog supply should fix the problem. The only downside that I can see is weight; analog supplies can be a bunch heavier, but t

Re: [Elecraft] (OT) - Unplanned Discovery

Yeah, me too.  I bought it because I thought it would be "super clean" and really small.  But its contribution to my problem was pretty much unarguable:  Plug it in and I hear noise.  Unplug it and I don't hear noise.  The instructions that came with it specifically stated that the Kx33 should

Re: [Elecraft] (OT) - Unplanned Discovery

Hi Stan, You're far from the only one, but I've been preaching this for many years.  Take a look at this piece that I wrote for National Contest Journal a year or two ago. http://k9yc.com/KillingReceiveNoise.pdf An important first move is to search out and destroy every switching power supp

Re: [Elecraft] KX3 Field Ant. for 80/40/30

I am well aware of that, Frank, and in fact I have multiple cores sitting here waiting for such measurements. However, performance of an isolated component is less important than overall system performance, where the matching to antenna impedance as well as counterpoise current routing and losse

[Elecraft] K3 - low power on SSB after antenna tuning

I’ve noticed an occasional situation where after tuning with the internal tuner, I have low power (about 20 watts on the K3 power display). I notice this in SSB only. A couple of dots on CW (I have CW in SSB enabled) clears the condition and returns things to normal power. (100 watts). A power

Re: [Elecraft] (OT) - Unplanned Discovery

Hi Barry, I wasn't the one who experienced the epiphany; have to lay that at Stan's feet. :) Frankly, it's not a big problem for me. However, it did connect a couple dots in that I was at my brother-in-law's house operating on the battery whilst visiting. I remarked that the noise floor was ver

[Elecraft] (OT) - Unplanned Discovery

Before you throw the Samlex supply in the trash, have a look at http://w4kaz.com/images/fp1023/samlex_1223_rfi_mods_from_zl2df.pdf and several other mod schemes found on the web. 73 Jim Allen W6OGC Sent from my iPad __ Elecraft mailin

Re: [Elecraft] (OT) - Unplanned Discovery

Don't put all switching power supplies in the same bucket.  There are very good ones that ARE QUIET, and then there are those that generate noise.   Just because it has the side or back posted with all types of certifications basically says  "they met specs at one time". I have 3 Astron switch

Re: [Elecraft] O.T. Morse is not dead, at least in the U.S. Navy

Fred and All, I think Morse is exactly what they are using with the signal lamps. The article I read about this confirmed that. Dave W7AQK - There was a recent URL posted involving using the venerable signal lamps for high speed communications be

Re: [Elecraft] (OT) - Unplanned Discovery

Most, if not all of those certifications are for safety, not emissions. Further, I'm not at all convinced that compliance with FCC/CISPR standards ensures no RFI to a ham station. Especially if your interests are weak signal, EME, etc. 73, Josh W6XU Sent from my mobile device > Just because

Re: [Elecraft] KX3 Field Ant. for 80/40/30

Hi Erik, Radiation results from RF current flowing in an antenna. An RF ammeter is a useful instrument for measuring the relative efficiency different types of matching networks feeding similar antennas. I'm well familiar with the simultaneous synchronized WSPRlite antenna performance anal

[Elecraft] KX3-2M SMA connector issue

I ordered the *KX3*-*2M for the KX3 and installed it yesterday, seems to be working great. However... now I have an issue with the SMA connector coming loose one me after only a few times placing the Elecraft 2m/440 whip antenna on and off.* *I was pretty careful to make sure the SMA antenna conne

Re: [Elecraft] KX3 Field Ant. for 80/40/30

On 11/19/2017 02:22, Erik Basilier wrote: The second approach, used by MyAntennas and others seems to use a transformer with much higher impedance ratio. One way to construct such a transformer would be to cascade two 9:1 units for an effective ratio of 81:1. While I haven't tried it, it would

Re: [Elecraft] O.T. Morse is not dead, at least in the U.S. Navy

Yes, it is morse code although the protocol is very different. For example, to call a distant (unknown) ship you point your big light at them and send AA. The proper response is a lng T. There’s a book carried aboard all ships that documents the protocols. I have a copy here somewhere..

Re: [Elecraft] (OT) - Unplanned Discovery

Josh, You are quite correct. The usual CISPR standards limits for many SMPS designs are typically set to 50dBuV across the HF spectrum, that translates to roughly 5/9+17dB. These standards are there to protect your old analog TV and commercial FM radio being messed up not your local Ham operato

Re: [Elecraft] (OT) - Unplanned Discovery

I have often wondered if the noise from a switching power supply would vary in intensity or other characteristics as the load changes. For example, during transmitting. In a single transmitter environment the user would probably not notice but in a multi-transmitter or SO2R station one just mi

Re: [Elecraft] KX3 Field Ant. for 80/40/30

For several years I've been using a 33 ft wire and a pair of small tapped loading coils to get  an EFHW vertical resonant on 20m. 30m and 40m.  It's fed with a link coupled tuned tank circuit consisting of a coil on a 1 inch powdered iron toroid and an air variable capacitor.  The link consists

Re: [Elecraft] KX3 Field Ant. for 80/40/30

Hi Frank, Thanks for your very useful comments. Below my answers: >Radiation results from RF current flowing in an antenna. An RF >ammeter is a useful instrument for measuring the relative efficiency >different types of matching networks feeding similar antennas. Granted. I might want t

[Elecraft] (OT) - Unplanned Discovery

Hi Stan, One thing we have learned in supplying thousands of Kx33s to hams is the importance of minimizing or eliminating common-mode currents in the antenna system.  The transverse mode RFI output of the Kx33 is extremely low and has never been the cause of noise to our customers, but if the

Re: [Elecraft] (OT) - Unplanned Discovery

Up here in Alaska its not unusual to experience loss of commercial power (often due to Inclement wx or avalanche). I've noted how quiet my radio is when no one around us has power. Even running our 6500w Honda invertor-generator its very quiet (which also tells my noise is coming from neighbo

Re: [Elecraft] O.T. Morse is not dead, at least in the U.S. Navy

On 2017-11-19 04:24 AM, Richard Lamont wrote: The people being trained by the US Navy to read Morse are intercept operators. The article indicated that they are only learning morse for a standard latin (ie. English) alphabet. A number of years ago I visited the radio room while on a boat crui

Re: [Elecraft] (OT) - Unplanned Discovery

Noise can absolutely change with load. At light load the SMPS may enter a pulse skipping mode. Some keep pulse width constant and vary switching frequency with load to effectively change duty cycle. Most (all?) will continuously modulate the switching frequency over a small range to spread out t