Re: [Elecraft] KPA-1500/FlexRadio 6400
On 9/15/2020 7:19 PM, Dave wrote: Actually the KPA1500 needs frequency tracking for the internal antenna tuner. NO, it does not. See my previous post. 73, Jim K9YC __ 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
Re: [Elecraft] KPA-1500/FlexRadio 6400
On 9/15/2020 7:14 PM, Michael Walker wrote: The Band data is the only thing that the KPA500 requires to operate. Actually, beginning with the tuner that goes with the K3 and their KPA amps do NOT need band data -- they detect frequency with as little as a 35 wpm dit or a tap on the mic and nearly instantaneously switch to the right band, and, if they have been properly trained per their manual, to the detected spot in the band! My Alpha 87As are also pretty fast. I"ve NEVER used band data with any of these amps or Elecraft tuners (KAT500, KPA500, KPA1500) or with the Alpha 87As. I DO use band data to switch bandpass filters and to switch antennas. 73, Jim K9YC __ 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
Re: [Elecraft] Why predistortion ?
Usually called adaptive optics these days. The laser is a "guide star". 73, Brian, K0DTJ > On Sep 15, 2020, at 16:39, Fred Jensen wrote: > > Didn't the term "pre-distortion" originate in the astronomy world where one > creates an artificial star with a powerful laser, and then distorts the > telescope mirror in real time to minimize atmospheric effects [twinkling]? __ 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
Re: [Elecraft] KPA-1500/FlexRadio 6400
oppsss... my bad! I saw KPA500 (not 1500). Sorry about that. However, the cabling is the same. :) Mike va3mw On Tue, Sep 15, 2020 at 10:19 PM Dave wrote: > Hi Mike > > Actually the KPA1500 needs frequency tracking for the internal antenna > tuner. > > The info I posted should help Mike. He is also welcome to contact me > direct and I can assist. > > 73 > Dave wo2x > > > Sent from my waxed string and tin cans. > > > On Sep 15, 2020, at 10:17 PM, Michael Walker > wrote: > > > > Mike > > > > I keep reading what you wrote, but how can you tell the difference? The > > Band data is the only thing that the KPA500 requires to operate. It > really > > doesn't care about the exact frequency. > > > > If you change bands on the 6400 and the KPA500 tracks from 1 band to > > another, then your installation is fine and you should be good to go. > > > > I used a KPA500 for years on a Flex 6300 without issue.For cables, > all > > that is required is a normal 9 pin male-female cable and then a Null > Modem > > Gender Bender adapter (yes, that is what they are called). > > > > Mike va3mw > > > > > > > > > >> On Tue, Sep 15, 2020 at 7:33 PM Mike Stone > wrote: > >> > >> This is my first post. I am not sure if or where the search function is > >> located. > >> > >> I am running a KPA-1500 and a FlexRadio 6400. The amplifier recognizes > >> the band that the Flex is tuned to but it doesn’t recognize the > frequency. > >> Any help would be appreciated. I am not technically proficient with > either > >> the Flex or the KPA-1500, so please keep it simple for me. > >> Thanks > >> Mike, N1VE > >> > >> > >> Sent from Mail for Windows 10 > >> > >> __ > >> 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 va...@portcredit.net > > __ > > 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 rocke...@gmail.com > __ 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
Re: [Elecraft] KPA-1500/FlexRadio 6400
Hi Mike Actually the KPA1500 needs frequency tracking for the internal antenna tuner. The info I posted should help Mike. He is also welcome to contact me direct and I can assist. 73 Dave wo2x Sent from my waxed string and tin cans. > On Sep 15, 2020, at 10:17 PM, Michael Walker wrote: > > Mike > > I keep reading what you wrote, but how can you tell the difference? The > Band data is the only thing that the KPA500 requires to operate. It really > doesn't care about the exact frequency. > > If you change bands on the 6400 and the KPA500 tracks from 1 band to > another, then your installation is fine and you should be good to go. > > I used a KPA500 for years on a Flex 6300 without issue.For cables, all > that is required is a normal 9 pin male-female cable and then a Null Modem > Gender Bender adapter (yes, that is what they are called). > > Mike va3mw > > > > >> On Tue, Sep 15, 2020 at 7:33 PM Mike Stone wrote: >> >> This is my first post. I am not sure if or where the search function is >> located. >> >> I am running a KPA-1500 and a FlexRadio 6400. The amplifier recognizes >> the band that the Flex is tuned to but it doesn’t recognize the frequency. >> Any help would be appreciated. I am not technically proficient with either >> the Flex or the KPA-1500, so please keep it simple for me. >> Thanks >> Mike, N1VE >> >> >> Sent from Mail for Windows 10 >> >> __ >> 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 va...@portcredit.net > __ > 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 rocke...@gmail.com __ 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
Re: [Elecraft] KPA-1500/FlexRadio 6400
Mike I keep reading what you wrote, but how can you tell the difference? The Band data is the only thing that the KPA500 requires to operate. It really doesn't care about the exact frequency. If you change bands on the 6400 and the KPA500 tracks from 1 band to another, then your installation is fine and you should be good to go. I used a KPA500 for years on a Flex 6300 without issue.For cables, all that is required is a normal 9 pin male-female cable and then a Null Modem Gender Bender adapter (yes, that is what they are called). Mike va3mw On Tue, Sep 15, 2020 at 7:33 PM Mike Stone wrote: > This is my first post. I am not sure if or where the search function is > located. > > I am running a KPA-1500 and a FlexRadio 6400. The amplifier recognizes > the band that the Flex is tuned to but it doesn’t recognize the frequency. > Any help would be appreciated. I am not technically proficient with either > the Flex or the KPA-1500, so please keep it simple for me. > Thanks > Mike, N1VE > > > Sent from Mail for Windows 10 > > __ > 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 va...@portcredit.net __ 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
Re: [Elecraft] K4 remote software question
The word that comes to mind for me is Osborne. But Elecraft didn’t have sales of the K3S halt as soon as they announced the K4. Indeed, the K4 has taken much longer than anticipated to ship, and supply issues have brought an end to much of the K3(S) product line. I’m sure there is much more K3(S) kit they could sell if only they were available. > On Aug 10, 2020, at 2:28 PM, Eric Norris wrote: > > One word: Borland. Local (to Elecraft) techies know their story. > > 73 Eric WD6DBM > > On Mon, Aug 10, 2020, 6:57 AM Dave wrote: > >> Bob >> >> I’ll chime in. >> >> If a company gives a forecasted ship date and misses the mark for any >> reason, including unforeseen circumstances that company would be “burned at >> the stake”. I have seen it before. So with COVID-19 the big wildcard, it >> is virtually impossible to predict any long term forecast. >> >> Some hams treat a projected date as written in stone. >> >> Dave wo2x >> >> Sent from my waxed string and tin cans. >> >>> On Aug 10, 2020, at 2:04 AM, K5WA wrote: >>> >>> After listening to Eric’s EXPO presentation, I thought I heard him say >> Elecraft would have an API for developers to develop remote software for >> the K4. I take that to mean that Elecraft will NOT have their own remote >> software offering so you must buy a K4/0 until software is available from >> 3rd parties. I had understood previously that Elecraft would actually >> have their own software available around the ship date of the K4 so I’ve >> been planning for that in my remote project. I guess I’ll have to switch >> gears and delay my remote project further. I was hoping to have it >> installed this year. >>> >>> >>> >>> On the K4 delivery issue, since the Group 1 purchasers are a known lot, >> it seems that any group that is full and finite should be able to be given >> a number (maybe even the actual/projected S/N) so that, for example, as >> people on this reflector announce that they received S/N 25 and your number >> was 50, you’d have a clue that your rig was getting close. Ideally, with >> supply chains running smoothly, Elecraft could show their production >> projections by S/N or at least an estimated units per week forecast as they >> ramp up. I realize the exact S/N may change due to special circumstances, >> but at least we’d have a ballpark pecking order of when to sit at the >> mailbox looking down the street (longingly) for a delivery truck. I’m not >> aware of a downside to letting folks know their actual or approximate spot >> in line. We all know Gavin Newsome and Dr. Faucci have the largest >> influence on delivery dates but I’d sure like to have a wee bit more >> transparency from Elecraft about our investment. >>> >>> >>> >>> I know there will be folks telling me to sit tight (as I have for the >> last 15+ months), they’re coming, but since late August is still the >> announced best guess for first production shipments, Elecraft surely has >> internal forecasts by now that could be parceled out to folks on the >> waiting list. Heck, I’ll even volunteer to be the body that tabulates the >> list if Elecraft wants to put me to work. (I’m guessing there are 500-1000 >> units in Group 1?) >>> >>> >>> >>> Semi-patiently waiting, 😉 >>> >>> >>> >>> Bob K5WA >>> >>> >>> >>> >>> >>> __ >>> 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 rocke...@gmail.com >> __ >> 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 norrislawfi...@gmail.com > __ > 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 aa...@arrl.net Bill Coleman, AA4LR, PP-ASELMail: aa...@arrl.net Web: http://boringhamradiopart.blogspot.com Quote: "Not within a thousand years will man ever fly!" -- Wilbur Wright, 1901 __ 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://ww
Re: [Elecraft] Why predistortion ?
Well part of the problem with the original Hubble lenses where they were miss ground in the 1st place Paul KB9AVO On Tue, Sep 15, 2020, 9:57 PM Fred Jensen wrote: > Isn't that what they did to Hubble originally? > > 73, > > Fred ["Skip"] K6DGW > Sparks NV DM09dn > Washoe County > > On 9/15/2020 5:41 PM, Drew AF2Z wrote: > > That's funny, I was also thinking of astronomy-- the > > Schmidt-Cassegrain telescope where the inherent aberrations of the > > relatively simple spherical mirror is corrected (pre-distorted?) with > > a lens... > > > > 73, > > Drew > > AF2Z > > > > On 09/15/20 18:39, Fred Jensen wrote: > >> Didn't the term "pre-distortion" originate in the astronomy world > >> where one creates an artificial star with a powerful laser, and then > >> distorts the telescope mirror in real time to minimize atmospheric > >> effects [twinkling]? That also reduces the twinkle on real nearby > >> stars too. Maybe that's something else. Pre-emphasis/De-emphasis in > >> FM broadcast [and analog land mobile FM] is sort of pre-distortion too. > >> > >> 73, > >> > >> Fred ["Skip"] K6DGW > >> Sparks NV DM09dn > >> Washoe County > > __ > 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 pvandyke1...@gmail.com __ 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
Re: [Elecraft] Why predistortion ?
Isn't that what they did to Hubble originally? 73, Fred ["Skip"] K6DGW Sparks NV DM09dn Washoe County On 9/15/2020 5:41 PM, Drew AF2Z wrote: That's funny, I was also thinking of astronomy-- the Schmidt-Cassegrain telescope where the inherent aberrations of the relatively simple spherical mirror is corrected (pre-distorted?) with a lens... 73, Drew AF2Z On 09/15/20 18:39, Fred Jensen wrote: Didn't the term "pre-distortion" originate in the astronomy world where one creates an artificial star with a powerful laser, and then distorts the telescope mirror in real time to minimize atmospheric effects [twinkling]? That also reduces the twinkle on real nearby stars too. Maybe that's something else. Pre-emphasis/De-emphasis in FM broadcast [and analog land mobile FM] is sort of pre-distortion too. 73, Fred ["Skip"] K6DGW Sparks NV DM09dn Washoe County __ 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
Re: [Elecraft] Why predistortion ?
That's funny, I was also thinking of astronomy-- the Schmidt-Cassegrain telescope where the inherent aberrations of the relatively simple spherical mirror is corrected (pre-distorted?) with a lens... 73, Drew AF2Z On 09/15/20 18:39, Fred Jensen wrote: Didn't the term "pre-distortion" originate in the astronomy world where one creates an artificial star with a powerful laser, and then distorts the telescope mirror in real time to minimize atmospheric effects [twinkling]? That also reduces the twinkle on real nearby stars too. Maybe that's something else. Pre-emphasis/De-emphasis in FM broadcast [and analog land mobile FM] is sort of pre-distortion too. 73, Fred ["Skip"] K6DGW Sparks NV DM09dn Washoe County On 9/15/2020 3:55 PM, Andy Durbin wrote: " Now I understand better what the discussion is all about." Who ever coined the term "predistortion" should be taken behind the bicycle shed and introduced to a 2x4. The terminology is the epitome of obfuscation! Andy, k3wyc __ 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 pu...@af2z.net __ 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
[Elecraft] K2 issue or is it?
Greetings folks. My K2 has a snapping sound when tuning the band regardless of mode and it seems to happen when I am close to a signal...within 4 khz or so. The snapping sound can be very strong sending the s meter soaring. Not only does the s meter go soaring, so do my ears! At this point I am not sure if this is more or less the nature of the beast Don't remember reading anything in the reviews about this oddity. Barry K3Bo __ 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
Re: [Elecraft] Why predistortion ?
On 9/15/2020 3:55 PM, Andy Durbin wrote: Who ever coined the term "predistortion" should be taken behind the bicycle shed and introduced to a 2x4. The terminology is the epitome of obfuscation! Hmmm. My EE degree is 56 years old, but the term seems quite clear and descriptive to an old fart like me! It's been done in audio systems for at least four decades, where it uses motional feedback from the loudspeakers to which the systems were carefully matched. The implementation was intended to correct for non-linearities in the loudspeakers, which are far greater than in the electronics. 73, Jim K9YC __ 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
Re: [Elecraft] K4 On-screen documentation
On 9/15/2020 2:52 PM, Rod Hardman wrote: Their Silicon Valley sense of good User Interface! Give at least some of the credit for the UI to Chief Engineer and co-owner N6KR, who is a very active operator. I've worked him several times on CW. Also credit engineer K6XX, a world class contester, AND Elecraft's long established practice of very actively listening to their users. Long before I became an Elecraft K2 user in 2003, their email reflector had been running for years, and both owners read it every day. 73, Jim K9YC __ 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
Re: [Elecraft] KPA-1500/FlexRadio 6400
Are you using the KXUSB cable from the amp transceiver port to back of Flex USB? Make sure you are in the transceiver port on amp and not AUX port. On Flex USB cable setup make sure to enable Auto Report. Also select advanced and set baud to 38400, 8, none, 1, and flow control none. Cycle amp status to show XCVR FREQ and TX COUNT The top line should show actual radio frequency and bottom line the approximate detected RF frequency when you transmit. If you need assistance, contact me direct at my call at arrl.net and I can do a remote session with you using Team Viewer. Dave wo2x Sent from my waxed string and tin cans. > On Sep 15, 2020, at 7:34 PM, Mike Stone wrote: > > This is my first post. I am not sure if or where the search function is > located. > > I am running a KPA-1500 and a FlexRadio 6400. The amplifier recognizes the > band that the Flex is tuned to but it doesn’t recognize the frequency. Any > help would be appreciated. I am not technically proficient with either the > Flex or the KPA-1500, so please keep it simple for me. > Thanks > Mike, N1VE > > > Sent from Mail for Windows 10 > > __ > 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 rocke...@gmail.com __ 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
Re: [Elecraft] Why predistortion ?
Didn't the term "pre-distortion" originate in the astronomy world where one creates an artificial star with a powerful laser, and then distorts the telescope mirror in real time to minimize atmospheric effects [twinkling]? That also reduces the twinkle on real nearby stars too. Maybe that's something else. Pre-emphasis/De-emphasis in FM broadcast [and analog land mobile FM] is sort of pre-distortion too. 73, Fred ["Skip"] K6DGW Sparks NV DM09dn Washoe County On 9/15/2020 3:55 PM, Andy Durbin wrote: " Now I understand better what the discussion is all about." Who ever coined the term "predistortion" should be taken behind the bicycle shed and introduced to a 2x4. The terminology is the epitome of obfuscation! Andy, k3wyc __ 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
[Elecraft] KPA-1500/FlexRadio 6400
This is my first post. I am not sure if or where the search function is located. I am running a KPA-1500 and a FlexRadio 6400. The amplifier recognizes the band that the Flex is tuned to but it doesn’t recognize the frequency. Any help would be appreciated. I am not technically proficient with either the Flex or the KPA-1500, so please keep it simple for me. Thanks Mike, N1VE Sent from Mail for Windows 10 __ 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
Re: [Elecraft] Why predistortion ?
> The terminology is the epitome of obfuscation!
Not at all ... "predistortion" has been used in TV broadcasting for
more than 40 years - even back in analog TV. It started as simple
non-linear amplifiers ("proc amps") perhaps 75 years ago to adjust
for the different levels of compression in the amplifier chain with
differing signal levels. However, with the advent of solid state
amplifiers at VHF and MSDC klystrons/IOTs at UHF additional levels
of "predistortion" were employed to cancel the regeneration of the
lower sideband from to *IMD* due to operating well beyond the 1 dB
compression point.
Of course those techniques carried over into digital (HD) TV and
were employed by the cellular industry with the conversion from
analog to digital.
"Predistortion" is a perfectly understandable term to anyone who
has a passing familiarity with the behavior of amplifiers in
compression.
73,
... Joe, W4TV
On 2020-09-15 6:55 PM, Andy Durbin wrote:
" Now I understand better what the discussion is all about."
Who ever coined the term "predistortion" should be taken behind the bicycle
shed and introduced to a 2x4. The terminology is the epitome of obfuscation!
Andy, k3wyc
__
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Re: [Elecraft] Why predistortion ?
Here on the ranch we call it "IMD optimization." Wayne > On Sep 15, 2020, at 3:55 PM, Andy Durbin wrote: > > " Now I understand better what the discussion is all about." > > Who ever coined the term "predistortion" should be taken behind the bicycle > shed and introduced to a 2x4. The terminology is the epitome of obfuscation! > > Andy, k3wyc __ 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
Re: [Elecraft] Why predistortion ?
Yes. On 9/14/2020 9:10 AM, Joe Subich, W4TV wrote: On 2020-09-14 7:29 AM, Charlie T wrote: > However, implementing the pre-distortion function IS probably a better long-term solution. Pre-distortion on a 12V rig only hides the problem. Any "home station" rig should have 28/50 V finals *and* then one can make it even cleaner with pre-distortion. If necessary, use 50V capable finals at 50W maximum output for 12V operation and 150-200 W output when a 48V supply is available. 73, ... Joe, W4TV __ 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
[Elecraft] 9-13-2020 Elecraft SSB Net
Here is the log of stations from last Sunday's 20m SSB Net. Thanks again to all the relay stations who make this net possible. I have saved this file as a rich text format. I am hoping that the question marks are absent in the digest version. Eric WB9JNZ. Elecraft SSB Nets 20 m net 1800Z 14.303.5 Sundays 40 m net 1900Z 7.280 Sundays 80 m net 0100Z 3.942 Sundays The frequency of this net may vary as we are discovering nets appearing on various frequencies. Please tune around to find us. We will start at 3.945 this coming Sunday. Call Name State Radio Serial # QRP Notes WB9JNZ Eric IL K3 4017 N6JW John CA K3 936 Relay Station K8NU/7 Carl OH/WA Yaesu FT 2000 NC0JW Jim CO KX3 1356 Relay Station WM6P Steve GA K3S 11453 Relay Station K7BRR Bill AZ K3S 10939 KO5V Jim NM K2/100 7225 Relay Station W1NGA Al CO KX2 2002 K7JG W7QHD Kurt AZ K2/100 1538 W5SV Dave TX K3 5354 AB7CE Roy MT K2/100 40 K1NW Brian RI K3 4974 Relay Station AE6JV Bill NH K3 6299 N0MPM Mike IA K3S 10514 W4DML Doug TN K3 6433 KG9NG Sam WI KX3/100 1749 N4NRW Roger SC K3 1318 KB0MPV Mike MN Icom 7300 1st Time Check In K6VWE Stan MI K3 650 N8SBE Dave MI KX2 2615 K7TPH Nicky ID KX3 10010 1st Time Check In KK5LD Dan TX K3 986 K7JG John WA KX3 3519 K6SBA David CA K3 565 N9SRA Steve IL Icom 7600 W5SV Dave TX KX2 72 10 Watts N6FAI Martin CA Yaesu FT 950 1st Time Check In __ 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
[Elecraft] Why predistortion ?
" Now I understand better what the discussion is all about." Who ever coined the term "predistortion" should be taken behind the bicycle shed and introduced to a 2x4. The terminology is the epitome of obfuscation! Andy, k3wyc __ 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
[Elecraft] KPA1500 STBY/OPER per band setting?
On my KPA1500, is there a way to save STBY/OPER per band setting? Thanks & 73 de Dave, W5SV __ 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
Re: [Elecraft] K4 On-screen documentation
Another one of the many reasons I am an Elecraft fanboy - Their Silicon Valley sense of good User Interface! Documentation and its integration to the physical operation of the product is something the best companies in the Bay Area do very well. Well done, can’t wait to see it. (but Im patient!) /rod On Sep 15, 2020, at 17:22, Rick Tavan wrote: I just had the opportunity to review a draft of the K4 on-screen documentation. It's excellent! It's fully hyper-linked with HTML browser capabilities so I could jump around, following links to my heart's content and eventually returning to where I began reading. It includes not only the anticipated explanations of each connector, physical switch, knob, and on-screen button, but also procedural operating instructions on how to do the things one needs to do with a radio. When loaded into a K4, it will be readable like a typical hypertext document with a Table of Contents at the top. Also, you will be able to tap a button to see help on the most-recently used function. So if you do something and aren't sure what happened, just ask and it will pop up an explanation of that control. Or tap something just to queue up help on how it works. Slick! I read the material on a computer browser but it was already white-on-black as I expect it to be on the K4 screen. Function names are bracketed and color-coded to distinguish physical switches, touch controls, and knobs. Hold-functions of switches and touch controls are in yellow instead of white and preceded by a modifier like "Hold" so I think it will be very usable by hams with compromised color vision. There are some handy pictures of panel and screen snippets that illustrate references beyond the shadow of doubt, but not so many as to make the document bulky or awkward. This Help system sets a standard that more technically advanced transceivers and other devices should evolve to meet. This text is also serving as the "seed" for the full, printable manual. I expect that manual to be in typical Elecraft style, with loads of diagrams and highly detailed explanations. I'm not sure I'll need it very often, though, since the on-screen material is so comprehensive. Please be merciful to Elecraft and refrain from immediate calls for a public version. That will follow soon, I'm sure, after the next round of revisions and additions. 73, /Rick N6XI Field Tester/Proof Reader -- Rick Tavan Truckee and Saratoga, CA __ 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 va3on.li...@gmail.com __ 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
Re: [Elecraft] Why predistortion ?
Many factors influence how wide the signal is in SSB, not just IMD3 numbers. These are: 1. Quality of ALC. Here K3 is excellent. FT in class A poor. 2. Overdriving the amp. Operators choice or ignorance. 3. Transmit bandwidth. Could be 300-2400 in contests. No adjustment in K3 except by crude EQ. 4. Amount of speech processing. 5. Equalization. Following W2XJ, the future is in the amp containing the complete TX stream. Perhaps only 3 stages, with DAC following by LNA directly driving the LDMOS finals, with bandpass and final filters. All what K4 (or K5 ) does, it to send relevant info to TX via Ethernet. Even better, have all in one box (K5_1500X). Probably the hardware cost is minimal. Nearly all the cost is in software dev't. Ignacy, NO9E -- 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: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
Re: [Elecraft] KIO3 Digital Board Failed and WSJTx transmit issues
Hi EdI just solved a similar problem with my K3 (s/n 1900 plus all K3 upgrades) setting up WSJTx after Windows 10 update and having to renumber COM ports that use FTDI chip USB adapters. I could not set my usual config for CAT and PTT (using CAT) and got a PTT ERR on the K3 which would go into TX but without power on WSJTx boot up. Just pushing TEST on and then off reset the K3IO and I was off to the races. This is in the original K3 manual, page 19 I think. Found on a previous post after search PTT ERR. In the K3 Manual: " If a PC or other device asserts RTS or DTR DIGOUT 1 while you're in the PTT-KEY menu entry, the K3 will enter TEST mode as a precaution. Page 19 In the tables below, 0 = 0 VDC, and 1 = device Normally, when the K3 is turned on, a 5-VDC logic supply voltage. signal appears on ACC pin 7 (K3 ON)." I thought my K3IO was toast as WSJTx software and FTDI serial USB adapters all worked fine with my FT-1000mp. This was caused by adjusting the K3 MENU and CONFIG setting while changing things on WSTJx at the same time.must have been in panic mode. Hi. Hope this helps.73Jeff VE3CV __ 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
[Elecraft] K4 On-screen documentation
I just had the opportunity to review a draft of the K4 on-screen documentation. It's excellent! It's fully hyper-linked with HTML browser capabilities so I could jump around, following links to my heart's content and eventually returning to where I began reading. It includes not only the anticipated explanations of each connector, physical switch, knob, and on-screen button, but also procedural operating instructions on how to do the things one needs to do with a radio. When loaded into a K4, it will be readable like a typical hypertext document with a Table of Contents at the top. Also, you will be able to tap a button to see help on the most-recently used function. So if you do something and aren't sure what happened, just ask and it will pop up an explanation of that control. Or tap something just to queue up help on how it works. Slick! I read the material on a computer browser but it was already white-on-black as I expect it to be on the K4 screen. Function names are bracketed and color-coded to distinguish physical switches, touch controls, and knobs. Hold-functions of switches and touch controls are in yellow instead of white and preceded by a modifier like "Hold" so I think it will be very usable by hams with compromised color vision. There are some handy pictures of panel and screen snippets that illustrate references beyond the shadow of doubt, but not so many as to make the document bulky or awkward. This Help system sets a standard that more technically advanced transceivers and other devices should evolve to meet. This text is also serving as the "seed" for the full, printable manual. I expect that manual to be in typical Elecraft style, with loads of diagrams and highly detailed explanations. I'm not sure I'll need it very often, though, since the on-screen material is so comprehensive. Please be merciful to Elecraft and refrain from immediate calls for a public version. That will follow soon, I'm sure, after the next round of revisions and additions. 73, /Rick N6XI Field Tester/Proof Reader -- Rick Tavan Truckee and Saratoga, CA __ 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
Re: [Elecraft] Why predistortion ?
On 9/14/2020 9:52 AM, Dave B via Elecraft wrote: > Pre-distortion is often used in modern cellular base-station > transmiters, and perhaps digital broadcast systems where they have to > handle multiple carriers simultaneously, "at power". At the beginning of this discussion I was confusing "predistortion" with "pre-emphasis" which in the FM broadcast field refers to the intentional introduction of nonlinear audio frequency response of the transmission chain, recovered by "de-emphasis" in the receivers. Now I understand better what the discussion is all about. 73 de K2ASP - Phil Kane Elecraft K2/100 s/n 5402 >From a Clearing in the Silicon Forest Beaverton (Washington County) Oregon __ 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
[Elecraft] KX3 Tx Inhibit CW-VOX problem
Having solved the need for getting +Ve Tx Inhibit working on my KX3/10GHz Transverter integration using a MOSFET switch to invert the logic level coming from the 10GHz transverter and configured the KX3 for 0v Tx Inhibit, I had the opportunity to test it out yesterday afternoon. The solution seemed to work fine on SSB but I now have a weird issue when using the rig on CW. If I manually select transmit with the microphone PTT (didn’t try the XMIT key) and then wait for the transverter sequencing to remove Tx Inhibit and then key CW with the paddles, the system works as desired. If I key the system using CW VOX, the Tx Inhibit functions correctly, fully disabling the transmitter from producing RF until TxInhibit is removed by the transverter’s sequencing logic BUT then the CW sidetone becomes permanently on from the moment TXInh disappears, regardless of whether I am keying or not. It stays present until I press any of the buttons on the KX3. This happens regardless of which band is enabled, but occurs whenever TxInhibit is initially present. If I remove the TXInh fro the ACC2 GPIO input (but leave the option enabled in the KX3 config) the rig operates normally under VOX control. Can anyone else replicate this oddball behavior? It seems to be a firmware bug. I have tried removing power from the KX3 but that does not correct the anomalous behavior. Again, all works just fine if I don’t try to key the paddles before PTT sequencing has changed over. Chris Cox, N0UK Chris Cox, N0UK 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 arch...@mail-archive.com
