Ed, I’d like the K1. Thaire. W2APF
> On Jan 22, 2019, at 16:41, elecraft-requ...@mailman.qth.net wrote: > > Send Elecraft mailing list submissions to > elecraft@mailman.qth.net > > To subscribe or unsubscribe via the World Wide Web, visit > http://mailman.qth.net/mailman/listinfo/elecraft > or, via email, send a message with subject or body 'help' to > elecraft-requ...@mailman.qth.net > > You can reach the person managing the list at > elecraft-ow...@mailman.qth.net > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of Elecraft digest..." > > > Today's Topics: > > 1. Re: Auto-spot, tuning aids, and the arcane history of CW > pitch-matching (Mike Harris) > 2. Re: Auto-spot, tuning aids, and the arcane history of CW > pitch-matching (David Gilbert) > 3. Re: Auto-spot, tuning aids, and the arcane history of CW > pitch-matching (K9MA) > 4. Re: Auto-spot, tuning aids, and the arcane history of CW > pitch-matching (K9MA) > 5. Re: K3 SWR Anomaly (N8LP) > 6. K2, K1, W1, and other stuff for Sale (Dauer, Edward) > 7. Re: Auto-spot, tuning aids, and the arcane history of CW > pitch-matching (Chris Cox, N0UK) > 8. Re: Auto-spot, tuning aids, and the arcane history of CW > pitch-matching (Chris Cox, N0UK) > 9. Zero Beat / CWT / Auto Spot (Jim Clymer) > 10. Re: Auto-spot, tuning aids, and the arcane history of CW > pitch-matching (Bob McGraw K4TAX) > 11. Re: Auto-spot, tuning aids, and the arcane history of CW > pitch-matching (Don Wilhelm) > 12. Re: Auto-spot, tuning aids, and the arcane history of CW > pitch-matching (rv6amark) > 13. Re: [KX3] Auto-spot, tuning aids, and the arcane history of > CW pitch-matching (Howard Hoyt) > 14. Re: Auto-spot, tuning aids, and the arcane history of CW > pitch-matching (Dave New, N8SBE) > 15. Re: Auto-spot, tuning aids, and the arcane history of CW > pitch-matching (Dave New, N8SBE) > 16. Urban stealth HF: Inside-the-backpack loop antenna? > (Wayne Burdick) > 17. Auto-spot, tuning aids, and the arcane history of CW > pitch-matching (Andy Durbin) > 18. Re: Auto-spot, tuning aids, and the arcane history of CW > pitch-matching (Wes) > 19. Re: Auto-spot, tuning aids, and the arcane history of CW > pitch-matching (ab2tc) > 20. Re: [KX3] Urban stealth HF: Inside-the-backpack loop antenna? > (Mark Goldberg) > 21. Re: Urban stealth HF: Inside-the-backpack loop antenna? > (Steve Sergeant) > 22. Re: [KX3] Urban stealth HF: Inside-the-backpack loop antenna? > (Michael Blake) > 23. Re: Auto-spot, tuning aids, and the arcane history of CW > pitch-matching (K9MA) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Tue, 22 Jan 2019 13:28:28 -0300 > From: Mike Harris <mike.har...@horizon.co.fk> > To: elecraft@mailman.qth.net > Subject: Re: [Elecraft] Auto-spot, tuning aids, and the arcane history > of CW pitch-matching > Message-ID: <99139b11-a047-0f9d-6981-4a1da3335...@horizon.co.fk> > Content-Type: text/plain; charset=utf-8; format=flowed > > Yet another trick learnt by hard experience given away for free :-( > > Regards, > > Mike VP8NO > >> On 22/01/2019 11:14, Nr4c wrote: >> Now, one thing you missed... when you?re working a big pileup and you feel >> you just can?t get through, it may be that all your ?buddies? are doing the >> same thing, using Auto-Spot! >> >> Now turn on XIT and set it to 12-20 Hz either way. Now your signal will be >> just a little different from all the others and you have a better chance of >> being heard. >> >> Sent from my iPhone >> ...nr4c. bill > > > ------------------------------ > > Message: 2 > Date: Tue, 22 Jan 2019 09:59:04 -0700 > From: David Gilbert <xda...@cis-broadband.com> > To: elecraft@mailman.qth.net > Subject: Re: [Elecraft] Auto-spot, tuning aids, and the arcane history > of CW pitch-matching > Message-ID: <d2e5fba7-83ea-6bfd-cbd8-d81db7261...@cis-broadband.com> > Content-Type: text/plain; charset=utf-8; format=flowed > > > Wayne, you forgot clicking on the DX Cluster spot.? ;) > > I'm being facetious, of course, but the practice of simply clicking on a > cluster spot does point out a problem with zero beating by any means ... > if every calling station is zero beat the station calling CQ isn't going > to copy anyone. > > Zero beat isn't always a good thing. > > 73, > Dave? AB7E > > >> On 1/21/2019 10:09 PM, Wayne Burdick wrote: >> Elecraft's auto-spot and CWT features -- available on the K3/K3S/KX2/KX3 -- >> are very useful tools for CW operators, especially those not experienced in >> pitch-matching. Here's a bit of history on where these features came from >> and how they work. >> >> >> CW Spotting History >> >> When a station finishes a CQ in CW mode, the operator faces the challenge of >> copying someone who's calling back. Callers may be weak or obscured by QRM; >> the op can usually deal with both problems by narrowing the filter passband. >> However, callers may also be off frequency. A calling station may be using a >> wide filter passband themselves, not attempting to carefully match their VFO >> frequency to that of the CQing station. The result may be no QSO, even when >> propagation is excellent. >> >> In the Days of Yore, a frequency offset between stations didn't always >> matter. Sometimes both stations used crystal-controlled transmitters, so >> operators had to patient tune around after calling CQ. >> >> As a 14-year-old novice I embraced this operating style for a year or so, >> armed with a dozen or so crusty FT-243 crystals for my Heath HW-16. I nearly >> wore out the socket swapping them in and out. After calling CQ, it was not >> unusual to find a caller 30 or more kHz away! (Away from "where" was a >> poorly answered question, as my Hallicrafters receiver dial wasn't exactly >> digital.) >> >> Fortunately I soon acquired an outboard VFO, a life-changing addition to my >> station. Jealous friends doubled up on their paper routes to pay for their >> own. Girls suddenly paid more attention to me. >> >> These days virtually everyone has a VFO, along with the expectation that >> they won't have to tune theirs very far, if at all, to tune you in. Not only >> that, they're stable and well calibrated, not like the beasts we had to >> skillfully tame. Progress! >> >> >> Manual Spotting (SPOT switch) >> >> Once I had a VFO I quickly learned to do *manual* pitch matching. Older rigs >> did't provide a way to do that explicitly, so you'd improvise. Basically, >> you had to coerce a very weak signal out of your own transmitter, say by >> turning on only the driver, then tune the transmit VFO until you could hear >> your signal on your own receiver -- superimposed on the calling station, at >> the same pitch. This is what we call spotting. >> >> Of course spotting is a lot more convenient these days, as many rigs include >> a SPOT switch. This function is easy for a modern transceiver designer to >> add, because the radio's firmware is quite capable of turning on only the CW >> sidetone without transmitting. >> >> That is the purpose of the SPOT switch on all Elecraft transceivers. Tap >> SPOT, and you'll hear your sidetone pitch. Most people can do a good job of >> adjusting the VFO such that the CQing station's pitch matches that of the >> SPOT tone. This ensures that when you call them, you'll be close to their >> own frequency. >> >> >> Tuning Aids: Filtering (APF), PLL (NE567), and Spectral (CWT) >> >> Since not everyone has an inherent musical ear, various hardware-enhanced >> means of tuning in CW signals have been developed. >> >> The simplest method is to just narrow your receiver passband so much that, >> if you can hear a station calling CQ at all, you're guaranteed to be "right >> on top of him." This assumes that your transceiver enforces alignment >> between its transmit and receive pitch...true of all Elecraft gear. >> >> Narrow filtering has gone through decades of evolution. Some filters were >> based on op-amps (active filters), while others were based on LC filtering, >> conscripting humongous toroidal cores scavenged from telco equipment. I >> acquired my stash of these from a haphazard mound of old switching racks, >> decaying in an abandoned aircraft hanger on the Bermuda U.S. Navy base. >> (That irresistible junk pile was also a mother load of TO5 transistors, >> multi-pound electrolytic capacitors, and tetanus, but that's another story.) >> Typically the toroids were 88 millihenries -- a huge value for a high-Q >> inductor, permitting resonance in the low audio range. >> >> Later, such filters migrated to digital signal processing, in the form of >> switched-capacitor ICs or DSPs. You can still buy these switched-capacitor >> chips, like the MF10, from various sources. It's instructive to roll your >> own tunable filter, just for fun. >> >> Whether passive or active, the goal of filtering is typically to achieve a >> narrow passband, say 250 Hz or less. With DSP, nearly perfect filters with >> "brick wall" passbands can be created. But these have the disadvantage of >> ringing like a bell when pinged by a CW signal or noise, making copy >> difficult. >> >> One solution incorporated into the K-line and KX-line is the Audio Peaking >> Filter (APF), which provides a 30-Hz bandwidth at -3 dB, but broad skirts, >> preventing ringing from occurring. As our customers will attest, APF works >> like magic on weak signals obscured by noise. >> >> Another forerunner to DSP techniques was the audio phase-locked-loop, using >> inexpensive ICs like the legendary LM567. When locked on a signal that >> matched its center frequency, the circuit would turn on an LED, alerting the >> operator that the VFO was now properly tuned. >> >> With the DSPs in our K-line and KX-line radios, we can provide a much more >> powerful tool: CWT, or "CW Tuning Aid." When enabled, CWT turns the upper >> portion of the rig's S-meter into something of a mini spectrum analyzer. The >> pitch of the strongest signal in the passband is analyzed by the DSP, then >> represented as a single segment of the bar graph. For CWT-enhanced manual >> spotting, the operator simply tunes the VFO slowly until the center CWT >> segment is flashing along with the keyed signal. >> >> Manual tuning with CWT can also be used in FSK-D and PSK-D modes as >> described in the owner's manual. >> >> >> Closing the Loop: Auto-Spotting (SPOT + CWT) >> >> The Elecraft K3/K3S/KX2/KX3 take CW tuning another step forward by providing >> a way to *automatically* retune the VFO frequency to match that of a >> received signal. How does this work? >> >> When CWT is turned on, firmware treats the SPOT switch as AUTO-SPOT. The DSP >> analyzes the incoming signal, and with a bit of processing, determines its >> exact audio pitch. From there all that's needed is a bit of math to offset >> the VFO to match this pitch to the CW sidetone. >> >> There's another subtlety, though. Since a CW signal is generally being keyed >> on and off, the CWT algorithm has to ensure that it doesn't "take off," >> chasing a signal that's not there. To avoid this, we keep track of the >> energy in the passband, and slew the VFO incrementally over an average of >> about 0.5 second, moving only when the target signal is present. >> >> >> How to Use Auto-Spot >> >> I encourage you to give the auto-spot feature a try. It's best to start with >> a fairly narrow passband, say 400-600 Hz; narrower if there's a lot of QRM. >> Find a signal, turn on CWT, then tap SPOT to tune it in. A second tap of >> SPOT may get even closer, especially if there's a lot of band noise. >> >> Auto-spot can also be used in Elecraft's PSK-D mode, i.e. for PSK31/PSK63. >> As with CW mode, just turn on CWT, tune in a prospective signal, and tap >> SPOT. Since PSK auto-decoding requires very accurate tuning, it's best to >> set the filter bandwidth to 50 Hz, then let auto-spot dial things in down to >> the last 2 or 3 Hz. If you have text decode turned on, you should start >> seeing text characters scroll by after auto-tuning has completed. Tapping a >> second time or fine-tuning the VFO a bit in 1 Hz steps may improve copy. >> >> 73, >> Wayne >> N6KR >> >> >> >> >> ______________________________________________________________ >> 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 list: http://www.qsl.net/donate.html >> Message delivered to xda...@cis-broadband.com >> > > > > ------------------------------ > > Message: 3 > Date: Tue, 22 Jan 2019 11:11:30 -0600 > From: K9MA <k...@sdellington.us> > To: elecraft@mailman.qth.net > Subject: Re: [Elecraft] Auto-spot, tuning aids, and the arcane history > of CW pitch-matching > Message-ID: <a15e08d5-8fb7-8063-a447-7936dfdd6...@sdellington.us> > Content-Type: text/plain; charset=utf-8; format=flowed > > Back in my college days at W9YT, we had a Drake line, separate > transmitter and receivers. When searching and pouncing in a contest, you > had to spot the transmitter before every contact. Spotting required > turning one of the rotary switches on the transmitter, a cumbersome > process. Imagine doing that a couple thousand times in a weekend. At > some point, we came up with the idea to hook a foot switch up to do the > spotting, which made it much easier, and save a lot of wear and tear on > the rotary switch, not to mention the operator's wrist. > > In those days, 40-50 years ago, transceivers just didn't work well on > CW, so almost all CW operators used separate transmitters and receivers. > Some, like the Drake line, could transceive, but had the same problem on > CW. Transceivers didn't account for the BFO offset, and there was no RIT > or XIT. If you called another station in transceive mode, you would be > 700 Hz or so off frequency. Two transceivers pretty much couldn't work > each other at all. Sometime while I was inactive in the late 70's and > 80's, that problem was solved, and we no longer had to spot before every > contact. I think that solution had to wait for frequency synthesis, as > it otherwise would have required additional (expensive) crystals. Does > anyone know of a non-synthesized transceiver that didn't have the CW > offset problem? > > 73, > Scott K9MA > > >> On 1/21/2019 23:09, Wayne Burdick wrote: >> Elecraft's auto-spot and CWT features -- available on the K3/K3S/KX2/KX3 -- >> are very useful tools for CW operators, especially those not experienced in >> pitch-matching. Here's a bit of history on where these features came from >> and how they work. > > > -- > Scott K9MA > > k...@sdellington.us > > > > ------------------------------ > > Message: 4 > Date: Tue, 22 Jan 2019 11:14:27 -0600 > From: K9MA <k...@sdellington.us> > To: elecraft@mailman.qth.net > Subject: Re: [Elecraft] Auto-spot, tuning aids, and the arcane history > of CW pitch-matching > Message-ID: <5df178e8-5d66-fb3f-b731-d6a036568...@sdellington.us> > Content-Type: text/plain; charset=utf-8; format=flowed > >> On 1/22/2019 10:59, David Gilbert wrote: >> >> Wayne, you forgot clicking on the DX Cluster spot. ;) > > Everyone zero beat was, I think, a bigger problem before skimmers. > Skimmer spots often seem to be quite a ways off frequency, probably > because their SDR receivers aren't all that stable. Some may be in > unheated buildings, too. > > 73, > > Scott K9MA > > -- > Scott K9MA > > k...@sdellington.us > > > > ------------------------------ > > Message: 5 > Date: Tue, 22 Jan 2019 11:13:25 -0700 (MST) > From: N8LP <n...@telepostinc.com> > To: elecraft@mailman.qth.net > Subject: Re: [Elecraft] K3 SWR Anomaly > Message-ID: <1548180805579-0.p...@n2.nabble.com> > Content-Type: text/plain; charset=us-ascii > > This may be out of left field, but I seem to recall from the deep recesses of > my memory that there were some issues regarding an IF trap in the output of > the K3. It could be that one of the components in the trap has changed and > it now affects 40m. I don't know if newer K3s even have this circuit. Just > thinking out loud. > > Larry N8LP > > > > > > -- > Sent from: http://elecraft.365791.n2.nabble.com/ > > > ------------------------------ > > Message: 6 > Date: Tue, 22 Jan 2019 18:15:19 +0000 > From: "Dauer, Edward" <eda...@law.du.edu> > To: "elecraft@mailman.qth.net" <elecraft@mailman.qth.net> > Subject: [Elecraft] K2, K1, W1, and other stuff for Sale > Message-ID: <eb637be8-8cd0-4576-b41d-a1f01a9a5...@law.du.edu> > Content-Type: text/plain; charset="utf-8" > > Selling principal home, no further need for seven HF transceivers. So the > following are for sale. Terms for each are: No pay Pal, shipment on receipt > of payment, seller packs, and buyer pays actual shipment cost from Denver, > CONUS only and selling to licensed hams only. All items unless otherwise > noted are in excellent cosmetic and electrical condition. Nonsmoking > environment, never used out of doors or in mobile / portable operations. > > I have two heavy dimpled main tuning knobs for the K2s. Original cost $90 > (as I remember it), option to buy for $50 each with purchase of a K2. Most > interconnecting cables for K2s are also available at no additional cost. > > K2/10 (s/n 7637) with KNB2, KAF2, KAT2, KIO2, KBT2 (with battery), and > optional heavy dimple knob. $900. > > K2/10 (s/n 7687) with KNB2, KSB2, KAF2, KPA100, and KAT100-1 in matching low > profile enclosure, with tilt stand. $1,300. > > K2/10 (s/n 7739) and KAT100/KPA100 in EC-2 enclosure (?twins? configuration). > K2 includes KNB2, KSB2, KAT2, KAF2, KIO2. $1,550. > > K1 (s/n 3440) 17 and 30 meters, with KAT1 internal ATU, KNB1 noise blanker, > and KBT1 internal battery adapter. Includes extra cover and speaker (not > used when cover with ATU is installed.) Tuned and aligned by Alan Wilcox. > $350. > > Elecraft W1 Power Meter in acrylic case w/stand. $70 > > KD1JV Triband Transceiver and external ATU (Kit built, never tested.) $100 > > Pico Keyer condition unknown. Free to whomever buys the first K2 or K1. > > > Ted, KN1CBR > > > > Edward A. Dauer > Dean Emeritus and Professor Emeritus of Law > University of Denver > > > ------------------------------ > > Message: 7 > Date: Tue, 22 Jan 2019 12:54:36 -0600 (CST) > From: "Chris Cox, N0UK" <chr...@chris.org> > To: K9MA <k...@sdellington.us> > Cc: elecraft@mailman.qth.net > Subject: Re: [Elecraft] Auto-spot, tuning aids, and the arcane history > of CW pitch-matching > Message-ID: <pine.lnx.4.64.1901221252100.27...@xsvr1.chris.org> > Content-Type: TEXT/PLAIN; charset=US-ASCII > > The transceive problem didn't seem to exist on any older non-synthesized > transceiver that I have used, including FT-101 series, TS-520/820 and > later, KW Electronics KW-2000E. these were all '70s era transceivers. > > -- > 73 Chris Cox, N0UK, G4JEC > chr...@chris.org > > > > ------------------------------ > > Message: 8 > Date: Tue, 22 Jan 2019 12:51:50 -0600 (CST) > From: "Chris Cox, N0UK" <chr...@chris.org> > To: K9MA <k...@sdellington.us> > Cc: elecraft@mailman.qth.net > Subject: Re: [Elecraft] Auto-spot, tuning aids, and the arcane history > of CW pitch-matching > Message-ID: <pine.lnx.4.64.1901221251260.27...@xsvr1.chris.org> > Content-Type: TEXT/PLAIN; charset=US-ASCII > > > > -- > 73 Chris Cox, N0UK, G4JEC > chr...@chris.org > >> On Tue, 22 Jan 2019, K9MA wrote: >> >> transmitter before every contact. Spotting required turning one of the rotary >> switches on the transmitter, a cumbersome process. Imagine doing that a >> couple >> thousand times in a weekend. At some point, we came up with the idea to hook >> a >> foot switch up to do the spotting, which made it much easier, and save a lot >> of wear and tear on the rotary switch, not to mention the operator's wrist. >> >> In those days, 40-50 years ago, transceivers just didn't work well on CW, so >> almost all CW operators used separate transmitters and receivers. Some, like >> the Drake line, could transceive, but had the same problem on CW. >> Transceivers >> didn't account for the BFO offset, and there was no RIT or XIT. If you called >> another station in transceive mode, you would be 700 Hz or so off frequency. >> Two transceivers pretty much couldn't work each other at all. Sometime while >> I >> was inactive in the late 70's and 80's, that problem was solved, and we no >> longer had to spot before every contact. I think that solution had to wait >> for >> frequency synthesis, as it otherwise would have required additional >> (expensive) crystals. Does anyone know of a non-synthesized transceiver that >> didn't have the CW offset problem? >> >> 73, >> Scott K9MA >> >> >>> On 1/21/2019 23:09, Wayne Burdick wrote: >>> Elecraft's auto-spot and CWT features -- available on the K3/K3S/KX2/KX3 -- >>> are very useful tools for CW operators, especially those not experienced in >>> pitch-matching. Here's a bit of history on where these features came from >>> and how they work. >> >> >> -- >> Scott K9MA >> >> k...@sdellington.us >> >> ______________________________________________________________ >> 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 list: http://www.qsl.net/donate.html >> Message delivered to chr...@chris.org >> > > > ------------------------------ > > Message: 9 > Date: Tue, 22 Jan 2019 14:27:25 -0500 > From: Jim Clymer <ws6x....@gmail.com> > To: elecraft@mailman.qth.net > Subject: [Elecraft] Zero Beat / CWT / Auto Spot > Message-ID: > <CAENrfz=2XpPoe8T9iJNbq2PwQUun3yPQ6r+DrGRA2B7=mwo...@mail.gmail.com> > Content-Type: text/plain; charset="UTF-8" > >> >> Anyone who has ever had the privilege of being on the receiving end of a >> huge CW pileup has a new appreciation for the tone deaf and those who never >> learned to use CWT. (And the savvy pileup busters who > > intentionally avoid zero beat.) Of course there is always the W5 - dead >> zero beat - who is so loud you don't hear anyone else no matter how far off >> frequency! > > Jim - WS6X > >> > Date: Mon, 21 Jan 2019 21:09:44 -0800 >> From: Wayne Burdick <n...@elecraft.com> >> To: Elecraft Reflector <elecraft@mailman.qth.net> >> Subject: [Elecraft] Auto-spot, tuning aids, and the arcane history >> of CW pitch-matching >> >> CW Spotting History >> Tuning Aids: Filtering (APF), PLL (NE567), and Spectral (CWT) >> How to Use Auto-Spot >> >> > > > ------------------------------ > > Message: 10 > Date: Tue, 22 Jan 2019 14:14:00 -0600 > From: Bob McGraw K4TAX <rmcg...@blomand.net> > To: elecraft@mailman.qth.net > Subject: Re: [Elecraft] Auto-spot, tuning aids, and the arcane history > of CW pitch-matching > Message-ID: <fc86b438-6051-f1fd-7e3b-07a4f2d69...@blomand.net> > Content-Type: text/plain; charset=utf-8; format=flowed > > Another trick which works well.?? Tune to a WWV frequency in CW mode.? > Press SPOT and the radio will jump on the exact carrier frequency.?? The > SPOT function can pull on to the WWV frequency as far away as about 100 > Hz.? Once the radio has? resolved SPOT, the readout / display is the > frequency of WWV +/- the error in Hz. Thus the readout of 9.999.992 is > indicating being 8 Hz low. > > From a cold start, FP being 19?C, I find? -8 Hz error on 10 MHz WWV.? > After about 15 minutes the FP is 25?C and the error is -1 Hz.? I've > tweaked the REF CAL such that after 1/2 hr. in receive tuning to WWV > from both higher and lower will produce a reading of 10.000.000.?? Will > all stations pse QNZ? QNN. > > 73 > > Bob, K4TAX > > > > > ------------------------------ > > Message: 11 > Date: Tue, 22 Jan 2019 15:19:54 -0500 > From: Don Wilhelm <donw...@embarqmail.com> > To: "Chris Cox, N0UK" <chr...@chris.org> > Cc: elecraft@mailman.qth.net > Subject: Re: [Elecraft] Auto-spot, tuning aids, and the arcane history > of CW pitch-matching > Message-ID: <48f3e257-a765-e853-62c6-d20e06109...@embarqmail.com> > Content-Type: text/plain; charset=utf-8; format=flowed > > In that era, SSB capable transceivers often offset the BFO by using a > different BFO crystal for CW transmit or CW receive - but that technique > slaved you to one sideband and one CW pitch. > There were other ways of doing the offset as well, but it was usually > done by shifting the BFO frequency. > > 73, > Don W3FPR > >> On 1/22/2019 1:54 PM, Chris Cox, N0UK wrote: >> The transceive problem didn't seem to exist on any older non-synthesized >> transceiver that I have used, including FT-101 series, TS-520/820 and >> later, KW Electronics KW-2000E. these were all '70s era transceivers. >> >> -- >> 73 Chris Cox, N0UK, G4JEC >> chr...@chris.org >> >> ______________________________________________________________ >> 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 list: http://www.qsl.net/donate.html >> Message delivered to donw...@embarqmail.com >> > > > ------------------------------ > > Message: 12 > Date: Tue, 22 Jan 2019 12:26:40 -0800 > From: rv6amark <rv6am...@yahoo.com> > To: K9MA <k...@sdellington.us>, elecraft@mailman.qth.net > Subject: Re: [Elecraft] Auto-spot, tuning aids, and the arcane history > of CW pitch-matching > Message-ID: <mailman.5342.1548193282.22883.elecr...@mailman.qth.net> > Content-Type: text/plain; charset=utf-8 > > Re:? "Does anyone know of a non-synthesized transceiver that didn't have the > CW offset problem?" > > My TenTec 540 doesn't have that problem, but my much older TenTec PM-3A > does.? If my memory is correct, the Heathkit HW8 has the problem, but they > fixed it in the HW9 with a small capacitor that switches in and out for RX/TX > to shift the VFO. > > There are others. > > Mark > KE6BB > > > > Sent via the Samsung Galaxy Tab E, an AT&T 4G LTE tablet > -------- Original message --------From: K9MA <k...@sdellington.us> Date: > 1/22/19 9:11 AM (GMT-08:00) To: elecraft@mailman.qth.net Subject: Re: > [Elecraft] Auto-spot, tuning aids, > ? and the arcane history of CW pitch-matching > Back in my college days at W9YT, we had a Drake line, separate > transmitter and receivers. When searching and pouncing in a contest, you > had to spot the transmitter before every contact. Spotting required > turning one of the rotary switches on the transmitter, a cumbersome > process. Imagine doing that a couple thousand times in a weekend. At > some point, we came up with the idea to hook a foot switch up to do the > spotting, which made it much easier, and save a lot of wear and tear on > the rotary switch, not to mention the operator's wrist. > > In those days, 40-50 years ago, transceivers just didn't work well on > CW, so almost all CW operators used separate transmitters and receivers. > Some, like the Drake line, could transceive, but had the same problem on > CW. Transceivers didn't account for the BFO offset, and there was no RIT > or XIT. If you called another station in transceive mode, you would be > 700 Hz or so off frequency. Two transceivers pretty much couldn't work > each other at all. Sometime while I was inactive in the late 70's and > 80's, that problem was solved, and we no longer had to spot before every > contact. I think that solution had to wait for frequency synthesis, as > it otherwise would have required additional (expensive) crystals. Does > anyone know of a non-synthesized transceiver that didn't have the CW > offset problem? > > 73, > Scott K9MA > > >> On 1/21/2019 23:09, Wayne Burdick wrote: >> Elecraft's auto-spot and CWT features -- available on the K3/K3S/KX2/KX3 -- >> are very useful tools for CW operators, especially those not experienced in >> pitch-matching. Here's a bit of history on where these features came from >> and how they work. > > > -- > Scott? K9MA > > k...@sdellington.us > > ______________________________________________________________ > 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 list: http://www.qsl.net/donate.html > Message delivered to rv6am...@yahoo.com > > ------------------------------ > > Message: 13 > Date: Tue, 22 Jan 2019 15:27:03 -0500 > From: Howard Hoyt <hh...@mebtel.net> > To: Mel Snyder <ct_digital_pho...@yahoo.com>, Wayne Burdick > <n...@elecraft.com> > Cc: Elecraft Reflector <elecraft@mailman.qth.net>, > "k...@yahoogroups.com" <k...@yahoogroups.com> > Subject: Re: [Elecraft] [KX3] Auto-spot, tuning aids, and the arcane > history of CW pitch-matching > Message-ID: <90b12bb3-b6c7-5d34-e454-3e842f7e3...@mebtel.net> > Content-Type: text/plain; charset=utf-8; format=flowed > > Hi Mel, > > I experienced the same reading Wayne's highly informative post!! > > I started off in 1970 with a homebrew 6L6/807 xtal xmtr with maybe 12 > xtals and a Hallicrafters S-38 which gave me hundreds of mesmerizing > hours in my parents basement.? That rig gave me my first huge shock as > well, so it is indeed memorable.? What idiot thought it was a good idea > to put the 500 V B+ connection on an unguarded terminal strip on the > back panel?? Wait, that was me... > > Still, I thought I was in heaven until my high school club bought a > Drake R-4B/T-4XB which blew me away and I ended up owning a pair in the > early 1980s and still love the Drake twins to this day. However they > have been gathering dust since I got my K3, which is the best rig > overall I have used to date, and love my KX3 in the car and on travel. > > Although it works well, I don't use Auto Spot is because it scrambles my > feeble brain as to where I am tuned; I am just not used to a rig > changing frequency without me intentionally doing it.? Perhaps this is a > mental artifact of heavy contesting, where I am loathe to leave a good > RUN frequency, indeed I often lock VFO A so I don't accidentally bump > the VFO A knob. > > Cheers & 73, > Howie / WA4PSC > > >> On 1/22/2019 1:51 PM, Mel Snyder ct_digital_pho...@yahoo.com [KX3] wrote: >> >> Wow, this is *great,* Wayne! Thanks. I am away from home, but will be >> interested to test the auto-spot when I get home. >> >> >> A wonderful trip down memory lane. While you were swapping crystals >> with your HW-16, I was a few years ahead of you as KN3AFW, swapping >> them first into my home-brew 6AG7-6L6 rig, and then, a borrowed Eico 720. >> >> I still own a lovely Johnson Ranger II, and an SB-301 Heathkit >> receiver with the original 500Hz filter, the combination of which >> require your explained tuning the VFO to the note of the received >> signal. But both are on my list to sell, along with my HW-9 and >> FT-707, inasmuch with my KX3 for good band conditions and my >> inherited/restored TS-940S when they?re poor, they are all surplus >> space-consumers. >> >> Every time I turn on my KX3, I am in awe of how far ham radio has >> progressed in the past 61 years since I was licensed. Like taking a >> cell call on my Apple Watch, it?s beyond anything I dreamed of as a >> kid back then. So glad I stopped by the Elecraft exhibit at the 2014 >> Hartford ARRL convention, and was taken by the enthusiasm of KX3 users >> that gathered there - and decided to join the cult. >> >> Mel, W3PYF >> >> >> >>> On Jan 22, 2019, at 12:09 AM, Wayne Burdick n...@elecraft.com >>> <mailto:n...@elecraft.com> [KX3] <kx3-nore...@yahoogroups.com >>> <mailto:kx3-nore...@yahoogroups.com>> wrote: >>> >>> Elecraft's auto-spot and CWT features -- available on the >>> K3/K3S/KX2/KX3 -- are very useful tools for CW operators, especially >>> those not experienced in pitch-matching. Here's a bit of history on >>> where these features came from and how they work. >>> >>> CW Spotting History >>> >>> When a station finishes a CQ in CW mode, the operator faces the >>> challenge of copying someone who's calling back. Callers may be weak >>> or obscured by QRM; the op can usually deal with both problems by >>> narrowing the filter passband. However, callers may also be off >>> frequency. A calling station may be using a wide filter passband >>> themselves, not attempting to carefully match their VFO frequency to >>> that of the CQing station. The result may be no QSO, even when >>> propagation is excellent. >>> >>> In the Days of Yore, a frequency offset between stations didn't >>> always matter. Sometimes both stations used crystal-controlled >>> transmitters, so operators had to patient tune around after calling CQ. >>> >>> As a 14-year-old novice I embraced this operating style for a year or >>> so, armed with a dozen or so crusty FT-243 crystals for my Heath >>> HW-16. I nearly wore out the socket swapping them in and out. After >>> calling CQ, it was not unusual to find a caller 30 or more kHz away! >>> (Away from "where" was a poorly answered question, as my >>> Hallicrafters receiver dial wasn't exactly digital.) >>> >>> Fortunately I soon acquired an outboard VFO, a life-changing addition >>> to my station. Jealous friends doubled up on their paper routes to >>> pay for their own. Girls suddenly paid more attention to me. >>> >>> These days virtually everyone has a VFO, along with the expectation >>> that they won't have to tune theirs very far, if at all, to tune you >>> in. Not only that, they're stable and well calibrated, not like the >>> beasts we had to skillfully tame. Progress! >>> >>> Manual Spotting (SPOT switch) >>> >>> Once I had a VFO I quickly learned to do *manual* pitch matching. >>> Older rigs did't provide a way to do that explicitly, so you'd >>> improvise. Basically, you had to coerce a very weak signal out of >>> your own transmitter, say by turning on only the driver, then tune >>> the transmit VFO until you could hear your signal on your own >>> receiver -- superimposed on the calling station, at the same pitch. >>> This is what we call spotting. >>> >>> Of course spotting is a lot more convenient these days, as many rigs >>> include a SPOT switch. This function is easy for a modern transceiver >>> designer to add, because the radio's firmware is quite capable of >>> turning on only the CW sidetone without transmitting. >>> >>> That is the purpose of the SPOT switch on all Elecraft transceivers. >>> Tap SPOT, and you'll hear your sidetone pitch. Most people can do a >>> good job of adjusting the VFO such that the CQing station's pitch >>> matches that of the SPOT tone. This ensures that when you call them, >>> you'll be close to their own frequency. >>> >>> Tuning Aids: Filtering (APF), PLL (NE567), and Spectral (CWT) >>> >>> Since not everyone has an inherent musical ear, various >>> hardware-enhanced means of tuning in CW signals have been developed. >>> >>> The simplest method is to just narrow your receiver passband so much >>> that, if you can hear a station calling CQ at all, you're guaranteed >>> to be "right on top of him." This assumes that your transceiver >>> enforces alignment between its transmit and receive pitch...true of >>> all Elecraft gear. >>> >>> Narrow filtering has gone through decades of evolution. Some filters >>> were based on op-amps (active filters), while others were based on LC >>> filtering, conscripting humongous toroidal cores scavenged from telco >>> equipment. I acquired my stash of these from a haphazard mound of old >>> switching racks, decaying in an abandoned aircraft hanger on the >>> Bermuda U.S. Navy base. (That irresistible junk pile was also a >>> mother load of TO5 transistors, multi-pound electrolytic capacitors, >>> and tetanus, but that's another story.) Typically the toroids were 88 >>> millihenries -- a huge value for a high-Q inductor, permitting >>> resonance in the low audio range. >>> >>> Later, such filters migrated to digital signal processing, in the >>> form of switched-capacitor ICs or DSPs. You can still buy these >>> switched-capacitor chips, like the MF10, from various sources. It's >>> instructive to roll your own tunable filter, just for fun. >>> >>> Whether passive or active, the goal of filtering is typically to >>> achieve a narrow passband, say 250 Hz or less. With DSP, nearly >>> perfect filters with "brick wall" passbands can be created. But these >>> have the disadvantage of ringing like a bell when pinged by a CW >>> signal or noise, making copy difficult. >>> >>> One solution incorporated into the K-line and KX-line is the Audio >>> Peaking Filter (APF), which provides a 30-Hz bandwidth at -3 dB, but >>> broad skirts, preventing ringing from occurring. As our customers >>> will attest, APF works like magic on weak signals obscured by noise. >>> >>> Another forerunner to DSP techniques was the audio phase-locked-loop, >>> using inexpensive ICs like the legendary LM567. When locked on a >>> signal that matched its center frequency, the circuit would turn on >>> an LED, alerting the operator that the VFO was now properly tuned. >>> >>> With the DSPs in our K-line and KX-line radios, we can provide a much >>> more powerful tool: CWT, or "CW Tuning Aid." When enabled, CWT turns >>> the upper portion of the rig's S-meter into something of a mini >>> spectrum analyzer. The pitch of the strongest signal in the passband >>> is analyzed by the DSP, then represented as a single segment of the >>> bar graph. For CWT-enhanced manual spotting, the operator simply >>> tunes the VFO slowly until the center CWT segment is flashing along >>> with the keyed signal. >>> >>> Manual tuning with CWT can also be used in FSK-D and PSK-D modes as >>> described in the owner's manual.. >>> >>> Closing the Loop: Auto-Spotting (SPOT + CWT) >>> >>> The Elecraft K3/K3S/KX2/KX3 take CW tuning another step forward by >>> providing a way to *automatically* retune the VFO frequency to match >>> that of a received signal. How does this work? >>> >>> When CWT is turned on, firmware treats the SPOT switch as AUTO-SPOT. >>> The DSP analyzes the incoming signal, and with a bit of processing, >>> determines its exact audio pitch. From there all that's needed is a >>> bit of math to offset the VFO to match this pitch to the CW sidetone. >>> >>> There's another subtlety, though. Since a CW signal is generally >>> being keyed on and off, the CWT algorithm has to ensure that it >>> doesn't "take off," chasing a signal that's not there. To avoid this, >>> we keep track of the energy in the passband, and slew the VFO >>> incrementally over an average of about 0.5 second, moving only when >>> the target signal is present. >>> >>> How to Use Auto-Spot >>> >>> I encourage you to give the auto-spot feature a try. It's best to >>> start with a fairly narrow passband, say 400-600 Hz; narrower if >>> there's a lot of QRM. Find a signal, turn on CWT, then tap SPOT to >>> tune it in. A second tap of SPOT may get even closer, especially if >>> there's a lot of band noise. >>> >>> Auto-spot can also be used in Elecraft's PSK-D mode, i.e. for >>> PSK31/PSK63. As with CW mode, just turn on CWT, tune in a prospective >>> signal, and tap SPOT. Since PSK auto-decoding requires very accurate >>> tuning, it's best to set the filter bandwidth to 50 Hz, then let >>> auto-spot dial things in down to the last 2 or 3 Hz. If you have text >>> decode turned on, you should start seeing text characters scroll by >>> after auto-tuning has completed. Tapping a second time or fine-tuning >>> the VFO a bit in 1 Hz steps may improve copy. >>> >>> 73, >>> Wayne >>> N6KR >>> >> >> __._,_.___ >> ------------------------------------------------------------------------ >> Posted by: Mel Snyder <ct_digital_pho...@yahoo.com> >> ------------------------------------------------------------------------ >> Reply via web post >> <https://groups.yahoo.com/neo/groups/KX3/conversations/messages/65003;_ylc=X3oDMTJyOGZ0NTd0BF9TAzk3MzU5NzE0BGdycElkAzc0NTIwOTQ3BGdycHNwSWQDMTcwNTA2MzEwOARtc2dJZAM2NTAwMwRzZWMDZnRyBHNsawNycGx5BHN0aW1lAzE1NDgxODMyMDE-?act=reply&messageNum=65003> >> >> ? 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Terms >> of Use <https://info.yahoo.com/legal/us/yahoo/utos/terms/> >> >> SPONSORED LINKS >> . >> >> __,_._,___ > > > ------------------------------ > > Message: 14 > Date: Tue, 22 Jan 2019 13:45:13 -0700 > From: "Dave New, N8SBE" <n8...@arrl.net> > To: elecraft@mailman.qth.net > Subject: Re: [Elecraft] Auto-spot, tuning aids, and the arcane history > of CW pitch-matching > Message-ID: > > <20190122134513.1fa1e31b6b6b329ecc65be958babcc1f.2b096db9da....@email09.godaddy.com> > > Content-Type: text/plain; charset="utf-8" > > When I upgraded from my K3 to a K3s, I took the opportunity to order a > 10 MHz Ref In option. > > I finally got around to hooking it up to a Leo Bodnar GPS receiver I > picked up at Dayton a year ago, and now the K3s is rock solid spot on > frequency. > > Don't know how i did without it all these years... > > 73, > > -- Dave, N8SBE > > -------- Original Message -------- > Subject: Re: [Elecraft] Auto-spot, tuning aids, and the arcane history > of CW pitch-matching > From: Bob McGraw K4TAX <rmcg...@blomand.net> > Date: Tue, January 22, 2019 3:14 pm > To: elecraft@mailman.qth.net > > Another trick which works well. Tune to a WWV frequency in CW mode. > Press SPOT and the radio will jump on the exact carrier frequency. The > SPOT function can pull on to the WWV frequency as far away as about 100 > Hz. Once the radio has resolved SPOT, the readout / display is the > frequency of WWV +/- the error in Hz. Thus the readout of 9.999.992 is > indicating being 8 Hz low. > > From a cold start, FP being 19?C, I find -8 Hz error on 10 MHz WWV. > After about 15 minutes the FP is 25?C and the error is -1 Hz. I've > tweaked the REF CAL such that after 1/2 hr. in receive tuning to WWV > from both higher and lower will produce a reading of 10.000.000. Will > all stations pse QNZ QNN. > > 73 > > Bob, K4TAX > > > > > > ------------------------------ > > Message: 15 > Date: Tue, 22 Jan 2019 13:47:04 -0700 > From: "Dave New, N8SBE" <n8...@arrl.net> > To: "Elecraft Reflector" <elecraft@mailman.qth.net> > Subject: Re: [Elecraft] Auto-spot, tuning aids, and the arcane history > of CW pitch-matching > Message-ID: > > <20190122134704.1fa1e31b6b6b329ecc65be958babcc1f.b1b5d245eb....@email09.godaddy.com> > > Content-Type: text/plain; charset="utf-8" > > I'm a great fan of using the auto-spot feature, and love to show it off > to all shack visitors, as an example of yet another reason they need to > upgrade to Elecraft, from whatever boat anchor they are still using... > > 73, > > -- Dave, N8SBE > > > ------------------------------ > > Message: 16 > Date: Tue, 22 Jan 2019 12:57:16 -0800 > From: Wayne Burdick <n...@elecraft.com> > To: Elecraft <elecraft@mailman.qth.net> > Cc: KX3 <k...@yahoogroups.com> > Subject: [Elecraft] Urban stealth HF: Inside-the-backpack loop > antenna? > Message-ID: <5eb8dddd-c0f1-42c4-b2f9-45ec3bd54...@elecraft.com> > Content-Type: text/plain; charset=utf-8 > > I?ve engaged in plenty of ultralight HF pack operation, with a KX2, AX1 > antenna and a dragged counterpoise. In wide open spaces it?s a blast. But > urban settings with dogs, wire-eating cacti and overzealous Neighborhood > Watchers can distract from one?s radio experience. > > So, just for grins, I?d like to try something completely incognerdo: no > visible antenna. A small remotely tuned loop (say 12? diameter) would seem to > be the best choice, as it would fit entirely inside a small backpack. It > could have modest efficiency while not requiring a counterpoise wire. Rigid > 1? copper pipe formed in a square would be convenient to deploy. > > The loop would be only 6 to 8? from soft tissue, so you?d want to run QRP, of > course. OTOH, we?re talking about HF. A cellphone by your ear is probably > worse. > > Any other antenna suggestions? > > Wayne > N6KR > > > > ---- > elecraft.com > > ------------------------------ > > Message: 17 > Date: Tue, 22 Jan 2019 20:57:26 +0000 > From: Andy Durbin <a.dur...@msn.com> > To: "elecraft@mailman.qth.net" <elecraft@mailman.qth.net> > Subject: [Elecraft] Auto-spot, tuning aids, and the arcane history of > CW pitch-matching > Message-ID: > > <mw2pr16mb2362cffbbc02b413c6216e618c...@mw2pr16mb2362.namprd16.prod.outlook.com> > > Content-Type: text/plain; charset="iso-8859-1" > > "Find a signal, turn on CWT, then tap SPOT to tune it in. A second tap of > SPOT may get even closer, especially if there's a lot of band noise." > > and > > "I'm a great fan of using the auto-spot feature, and love to show it off to > all shack visitors, as an example of yet another reason they need to upgrade > to Elecraft," > > I must be missing something. How is this 2 step activated spot feature > better than a single press of Kenwood's CWT? I often use CWT on my TS-590S > but almost always with a spit or XIT offset (I didn't know that was a secret). > > Andy, k3wyc > > > ------------------------------ > > Message: 18 > Date: Tue, 22 Jan 2019 14:01:33 -0700 > From: Wes <wes_n...@triconet.org> > To: elecraft@mailman.qth.net > Subject: Re: [Elecraft] Auto-spot, tuning aids, and the arcane history > of CW pitch-matching > Message-ID: <619ac274-ad1e-282d-8b1e-0b37685b0...@triconet.org> > Content-Type: text/plain; charset=utf-8; format=flowed > > Are you serious? > > Wes? N7WS > >> On 1/22/2019 1:45 PM, Dave New, N8SBE wrote: >> Don't know how i did without it all these years... >> >> 73, >> >> -- Dave, N8SBE >> > > > > ------------------------------ > > Message: 19 > Date: Tue, 22 Jan 2019 14:01:52 -0700 (MST) > From: ab2tc <ab...@arrl.net> > To: elecraft@mailman.qth.net > Subject: Re: [Elecraft] Auto-spot, tuning aids, and the arcane history > of CW pitch-matching > Message-ID: <1548190912091-0.p...@n2.nabble.com> > Content-Type: text/plain; charset=us-ascii > > Hi all, > > Agreed; the problem can easily be solved in analog radios without frequency > synthesis by offsetting the BFO frequency by those 700Hz or so in transmit. > In down conversion machines with a single IF in the 8-9MHz range that could > easily be done by pulling the BFO crystal. The Drake TR4 undoubtedly worked > this way. I bought my first transceiver in 1969 (I think), a Yaesu FT-200, I > think it was called in the US. In Europe it was sold as Sommerkamp FT-250. > As the Drake TR4 it was down conversion with a single 9MHz IF and worked CW > by pulling the BFO crystal into the passband of the 9MHz crystal filter on > transmit. > > Another technical solution, which was used in the Collins KWM2 (and probably > KWM1) was to keep the balanced (de)modulator balanced and inject an audio > tone into it on transmit. Clearly the spectral purity of the CW signal would > be less than ideal in this case, but I am not sure if FCC type approval was > needed in those days. Nor am I sure what the the FCC spec for "inband" (read > close in) spurs would be. > > AB2TC - Knut > > > n0uk wrote >> The transceive problem didn't seem to exist on any older non-synthesized >> transceiver that I have used, including FT-101 series, TS-520/820 and >> later, KW Electronics KW-2000E. these were all '70s era transceivers. >> >> >> >> -- >> 73 Chris Cox, N0UK, G4JEC > >> chrisc@ > >> >> _ >> <snip> > > > > > > -- > Sent from: http://elecraft.365791.n2.nabble.com/ > > > ------------------------------ > > Message: 20 > Date: Tue, 22 Jan 2019 14:32:47 -0700 > From: Mark Goldberg <marklgoldb...@gmail.com> > To: Wayne Burdick <n...@elecraft.com> > Cc: Elecraft <elecraft@mailman.qth.net>, KX3 <k...@yahoogroups.com> > Subject: Re: [Elecraft] [KX3] Urban stealth HF: Inside-the-backpack > loop antenna? > Message-ID: > <CAKn+a3tdcK4Gk+SLSuyEP+2CR+nFK+qRtnVZWecrf0qDoh=c...@mail.gmail.com> > Content-Type: text/plain; charset="UTF-8" > > I would expect any high Q antenna like a loop would be detuned by any > movement or any metal you pass by. One more reason to support automatic > mobile screwdriver / mag loop antenna tuning on the KX series. > A flag on a backpack would be more or less ignored. Just put a flag on the > top of the AX1. Counterpoise is an issue though. Maybe a short one down > your leg? > > Now, if you dressed as a homeless or otherwise distressed person, lots of > weird things are possible, tinfoil hat with a big flag, dragged wire > disguised as one of those fake animals on a leash, etc. The weirder, the > more people will ignore you. > > Hopefully taken in the spirit of which it is posted. > > 73, > > Mark > W7MLG > > > On Tue, Jan 22, 2019 at 1:57 PM Wayne Burdick n...@elecraft.com [KX3] < > kx3-nore...@yahoogroups.com> wrote: > >> >> >> I?ve engaged in plenty of ultralight HF pack operation, with a KX2, AX1 >> antenna and a dragged counterpoise. In wide open spaces it?s a blast. But >> urban settings with dogs, wire-eating cacti and overzealous Neighborhood >> Watchers can distract from one?s radio experience. >> >> So, just for grins, I?d like to try something completely incognerdo: no >> visible antenna. A small remotely tuned loop (say 12? diameter) would seem >> to be the best choice, as it would fit entirely inside a small backpack. It >> could have modest efficiency while not requiring a counterpoise wire. >> Rigid 1? copper pipe formed in a square would be convenient to deploy. >> >> The loop would be only 6 to 8? from soft tissue, so you?d want to run QRP, >> of course. OTOH, we?re talking about HF. A cellphone by your ear is >> probably worse. >> >> Any other antenna suggestions? >> >> Wayne >> N6KR >> >> >> >> ---- >> elecraft.com >> >> __._,_.___ >> ------------------------------ >> Posted by: Wayne Burdick <n...@elecraft.com> >> ------------------------------ >> Reply via web post >> <https://groups.yahoo.com/neo/groups/KX3/conversations/messages/65005;_ylc=X3oDMTJyOWdpcW0yBF9TAzk3MzU5NzE0BGdycElkAzc0NTIwOTQ3BGdycHNwSWQDMTcwNTA2MzEwOARtc2dJZAM2NTAwNQRzZWMDZnRyBHNsawNycGx5BHN0aW1lAzE1NDgxOTA2NDA-?act=reply&messageNum=65005> >> ? Reply to sender >> <n...@elecraft.com?subject=Re%3A%20Urban%20stealth%20HF%3A%20Inside-the-backpack%20loop%20antenna%3F> >> ? Reply to group >> <k...@yahoogroups.com?subject=Re%3A%20Urban%20stealth%20HF%3A%20Inside-the-backpack%20loop%20antenna%3F> >> ? Start a New Topic >> <https://groups.yahoo.com/neo/groups/KX3/conversations/newtopic;_ylc=X3oDMTJmZW4xYXF1BF9TAzk3MzU5NzE0BGdycElkAzc0NTIwOTQ3BGdycHNwSWQDMTcwNTA2MzEwOARzZWMDZnRyBHNsawNudHBjBHN0aW1lAzE1NDgxOTA2NDA-> >> ? Messages in this topic >> <https://groups.yahoo.com/neo/groups/KX3/conversations/topics/65005;_ylc=X3oDMTM3cGU2OTN1BF9TAzk3MzU5NzE0BGdycElkAzc0NTIwOTQ3BGdycHNwSWQDMTcwNTA2MzEwOARtc2dJZAM2NTAwNQRzZWMDZnRyBHNsawN2dHBjBHN0aW1lAzE1NDgxOTA2NDAEdHBjSWQDNjUwMDU-> >> (1) >> ------------------------------ >> Have you tried the highest rated email app? <https://yho.com/1wwmgg> >> With 4.5 stars in iTunes, the Yahoo Mail app is the highest rated email >> app on the market. What are you waiting for? Now you can access all your >> inboxes (Gmail, Outlook, AOL and more) in one place. 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Terms >> of Use <https://info.yahoo.com/legal/us/yahoo/utos/terms/> >> >> SPONSORED LINKS >> . >> >> __,_._,___ >> > > > ------------------------------ > > Message: 21 > Date: Tue, 22 Jan 2019 13:38:35 -0800 > From: Steve Sergeant <steve...@effable.com> > To: elecraft@mailman.qth.net > Subject: Re: [Elecraft] Urban stealth HF: Inside-the-backpack loop > antenna? > Message-ID: <63fb5351-46b5-0d73-e53d-ba852f654...@effable.com> > Content-Type: text/plain; charset=utf-8 > >> On 1/22/19 12:57 PM, Wayne Burdick wrote: >> A small remotely tuned loop (say 12? diameter) would seem to be the best >> choice, as it would fit entirely inside a small backpack. It could have >> modest efficiency while not requiring a counterpoise wire. Rigid 1? copper >> pipe formed in a square would be convenient to deploy. > > [Deletia] > >> Any other antenna suggestions? > > I tried a 52ft 26ga wire J-pole/Zep on the line of a 5ft parafoil kite, > with 50ft of kite line above the antenna, and another 50' of RG-174 > between the antenna and the radio. > > I'll grant that this is not as invisible as your idea. But I felt > reasonably inconspicuous working SSB with cell-phone type earbuds > (w/mic), and the KX2 in an open waist-pack, out in an open field of a > large city park. People just thought I was on a phone call while flying > the kite. It helped that there were several other kite-fliers in the > park that day. > > It was not a particularly good day for propagation, but I did work Las > Vegas and Spokane from Silicon Valley with under 10W on 20m. > > > > > ------------------------------ > > Message: 22 > Date: Tue, 22 Jan 2019 16:40:04 -0500 > From: Michael Blake <k9...@mac.com> > To: Mark Goldberg <marklgoldb...@gmail.com> > Cc: Elecraft Reflector <elecraft@mailman.qth.net>, KX3 > <k...@yahoogroups.com> > Subject: Re: [Elecraft] [KX3] Urban stealth HF: Inside-the-backpack > loop antenna? > Message-ID: <53ccb8bd-bff8-46cc-83ac-0f0a12d89...@mac.com> > Content-Type: text/plain; charset=us-ascii > > Mark (W7MLG), It is scary how perfectly sane and normal your suggestions > sound to me :) > > Very 73 - Mike - K9JRI > > > > > > > >> On Jan 22, 2019, at 4:32 PM, Mark Goldberg <marklgoldb...@gmail.com> wrote: >> >> I would expect any high Q antenna like a loop would be detuned by any >> movement or any metal you pass by. One more reason to support automatic >> mobile screwdriver / mag loop antenna tuning on the KX series. >> A flag on a backpack would be more or less ignored. Just put a flag on the >> top of the AX1. Counterpoise is an issue though. Maybe a short one down >> your leg? >> >> Now, if you dressed as a homeless or otherwise distressed person, lots of >> weird things are possible, tinfoil hat with a big flag, dragged wire >> disguised as one of those fake animals on a leash, etc. The weirder, the >> more people will ignore you. >> >> Hopefully taken in the spirit of which it is posted. >> >> 73, >> >> Mark >> W7MLG >> >> >> On Tue, Jan 22, 2019 at 1:57 PM Wayne Burdick n...@elecraft.com [KX3] < >> kx3-nore...@yahoogroups.com> wrote: >> > > > > ------------------------------ > > Message: 23 > Date: Tue, 22 Jan 2019 15:41:14 -0600 > From: K9MA <k...@sdellington.us> > To: elecraft@mailman.qth.net > Subject: Re: [Elecraft] Auto-spot, tuning aids, and the arcane history > of CW pitch-matching > Message-ID: <089118fa-b031-7b6d-b2b6-c31ff6dda...@sdellington.us> > Content-Type: text/plain; charset=utf-8; format=flowed > >> On 1/22/2019 14:14, Bob McGraw K4TAX wrote: >> Another trick which works well.?? Tune to a WWV frequency in CW mode. >> Press SPOT and the radio will jump on the exact carrier frequency. > > You can do the same thing, of course, by listening to the beat between > the sidetone and the carrier. I was able to get 3 Hz closer that way, > within the 1 Hz tuning resolution. 3 Hz is close enough, though. > > When listening for the beats, you have to match the volume of the > sidetone and carrier, or you won't hear them. You don't need a musical > ear, just a functioning one. > > 73, > > Scott K9MA > > -- > Scott K9MA > > k...@sdellington.us > > > > ------------------------------ > > _______________________________________________ > Elecraft mailing list > Post to: Elecraft@mailman.qth.net > http://mailman.qth.net/mailman/listinfo/elecraft > You must be a subscriber to post. > Elecraft web page: http://www.elecraft.com > > End of Elecraft Digest, Vol 177, Issue 36 > ***************************************** > ______________________________________________________________ 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 list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
