Re: [Elecraft] multi port usb hub and k3 KUSB
On 4/20/2010 5:41 PM, Peter Chamalian wrote: >>> Has anyone used some kind of a usb hub to hook multiple devices >>> to the laptop simultaneously? >> I have two such "generic" hubs hooked up to my laptop and they >> work perfectly with Win XP. > Use a powered hub rather than non-powered. Yes...both of them are powered from the master UPS. -- 73 de K2ASP - Phil Kane Elecraft K2/100 s/n 5402 __ 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
Re: [Elecraft] K3 birdies
LOL It just sounds like a carrier wave, Dale -- a tone that changes audio frequency as you tune through it. There are two definitions of "birdie" in ham radio lingo. The definition being used here means a signal that is being generated INSIDE the receiver. In other words, if you disconnect the antenna, you still hear it. Superheterodyne receivers equipped with microprocessors generate a lot of different signals internally, and it's virtually impossible to keep some of them from mixing together to put a "signal" where you don't want it: in the middle of a ham band. Receiver designers simply try to minimize this occurrence by applying good RF engineering practices. The other definition often used is simply broader: any signal (carrier) picked up by your receiver from outside that is not an actual, intentional communications signal. Can be generated by computer equipment, consumer electronics, and other "unintentional radiators." Mostly these are of concern to weak-signal VHF/UHF operators who are listening for signals at or below the noise floor -- i.e., in the sub-microvolt range -- where any tiny little "birdie" of this sort in the wrong place can wreak havoc. Bill W5WVO -- From: "Dale HardingK7DNH" Sent: Tuesday, April 20, 2010 8:43 PM To: Subject: Re: [Elecraft] K3 birdies > > ok - please dont laugh - on second thought I guess this may be somewhat > amusing to many of you... > > I'm somewhat new to ham radio - and having no "elmer" around - > > what exactly does a amatuer radio "birdie" sound like?? I have an idea > ... > but there are a lot of different sounds "real feathered birdies" make - so > I > am kind of at a loss to what I may be trying to listen for exactly - and I > have searched the web trying to find a sound bite of one to no avail. > > I may have them in my radio also - but since I can get all sorts of weird > noises at different times on different bands - (especially the ones that > sounds like a '60's era television flying saucer is coming in for a > landing > is always interesting to listen to for a minute) - I really never thought > that it was in the radio - just something normally "out there" > sometimes. > > Anyone know where I can download the darn sound so I know what the heck it > is?? > > Now stop chuckling!! > -- > View this message in context: > http://n2.nabble.com/K3-birdies-tp4927074p4934852.html > Sent from the [K3] mailing list archive at 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 > > __ 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
[Elecraft] (no subject)
Something doesn't make sense. The K3 is 10 years old and is better than an SB-102? --- ok, I get that part. As to the legal limit thing, perhaps the legal limit will be reduced to 100 Watts or so ;-) :-) Grant/NQ5T On Apr 20, 2010, at 1:45 PM, wrote Seriously. The K2/100 is ten-year-old technology. Yet it has way more functionality for its size and weight than transceivers that are ten or twenty years older. With advances in component miniaturization and material science, it will eventually be possible to have a legal limit rig with PS and ATU all in a package the size of the K3. __ 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
[Elecraft] KX1 Opinions PLEASE
Hi, I am contemplating purchasing a KX1 and I would like some input regarding the general coverage receive aspect of this unit. I realize that the KX1 is designed for portable QRP CW use, and that is my primary interest, however, I also like to do some general listening of SSB signals both amateur and outside of the amateur bands. Please give me your input as to how well or poorly does the KX1 work for general coverage listening. Is it sensitive to weak signals? Does the audio sound okay? Often when camping or even late at night when I can't sleep, I like to tune around the bands with my FT817 (in my lap) listening to voice type communications, be it amateur or utility and I would like to know if the KX1 would be good for this type of activity. Thank you in advance for your reply. 73 Bob VE3UK __ 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
Re: [Elecraft] K3 birdies
ok - please dont laugh - on second thought I guess this may be somewhat amusing to many of you... I'm somewhat new to ham radio - and having no "elmer" around - what exactly does a amatuer radio "birdie" sound like?? I have an idea ... but there are a lot of different sounds "real feathered birdies" make - so I am kind of at a loss to what I may be trying to listen for exactly - and I have searched the web trying to find a sound bite of one to no avail. I may have them in my radio also - but since I can get all sorts of weird noises at different times on different bands - (especially the ones that sounds like a '60's era television flying saucer is coming in for a landing is always interesting to listen to for a minute) - I really never thought that it was in the radio - just something normally "out there" sometimes. Anyone know where I can download the darn sound so I know what the heck it is?? Now stop chuckling!! -- View this message in context: http://n2.nabble.com/K3-birdies-tp4927074p4934852.html Sent from the [K3] mailing list archive at 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
Re: [Elecraft] Grounding negative side of power supply?
I had an end-fed 1/2 wave L (135 feet, 65 up and 70 out) which was at DC ground at the base feedpoint and connected with three ground rods in a ten foot radius. Lightning evaporated it. Grounding does NOT keep it from being struck. However it did not continue to the house on the coax, which was further grounded at the house entry point. I DID have a 20 foot #4 bonding wire from the house entrance ground out to the base tuning unit and those ground rods that ran parallel to the coax most of the way. 73, Guy. On Tue, Apr 20, 2010 at 10:14 PM, Bill Coleman wrote: > > On Apr 20, 2010, at 7:52 PM, Robert Mcgraw wrote: > >> At my shop sits my 100 ft tower for the 3 repeaters and one of my HF >> stations. Some 50 ft away is a old Hickory tree that's about 60 to 70 ft >> tall. Two years ago I received a lightning strike that destroyed the >> tree. No damage to the tower, any of the 12 antennas on the tower or any >> of the equipment in the two racks in the building. The tower and >> equipment was correctly and properly grounded. The tree wasn't. > > A number of years ago, I got an induced strike on an untuned doublet that > vaporized the copper out of 45 feet of window line from the doublet to the > remote balun under the eaves of the house. Left a huge black mark on the side > of the house. > > None of my radio gear was hurt. It was all in the car. It was Sunday of Field > Day, and I had come home to nap and hadn't unpacked my gear. > > The doublet was unconnected. I believe I would not have taken any damage had > the antenna been properly grounded at the time. Today I ground all my > antennas that are not in use. > > > > Bill Coleman, AA4LR, PP-ASEL Mail: 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://www.qsl.net/donate.html > __ 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
Re: [Elecraft] External Power Supply for the KPA-500
Elecraft Dick Tracy Special wrist transceiver. Being strong enough to support the 120 foot tower--Priceless. Rich NU6T Bill Coleman wrote: > On Apr 20, 2010, at 1:45 PM, Lew Phelps K6LMP wrote: > > >> You can't have it all -- legal limit amp, power supply for same, legal limit >> ATU, etc. are incompatible with small size, light weight, and ability to >> run on 110 VAC mains. you just can't shoehorn a "big gun" station into a >> briefcase. >> > > Yet. > > Seriously. The K2/100 is ten-year-old technology. Yet it has way more > functionality for its size and weight than transceivers that are ten or > twenty years older. > > With advances in component miniaturization and material science, it will > eventually be possible to have a legal limit rig with PS and ATU all in a > package the size of the K3. > > Just not yet. > > 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://www.qsl.net/donate.html > > > __ 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
Re: [Elecraft] Grounding negative side of power supply?
On Apr 20, 2010, at 7:52 PM, Robert Mcgraw wrote: > At my shop sits my 100 ft tower for the 3 repeaters and one of my HF > stations. Some 50 ft away is a old Hickory tree that's about 60 to 70 ft > tall. Two years ago I received a lightning strike that destroyed the > tree. No damage to the tower, any of the 12 antennas on the tower or any > of the equipment in the two racks in the building. The tower and > equipment was correctly and properly grounded. The tree wasn't. A number of years ago, I got an induced strike on an untuned doublet that vaporized the copper out of 45 feet of window line from the doublet to the remote balun under the eaves of the house. Left a huge black mark on the side of the house. None of my radio gear was hurt. It was all in the car. It was Sunday of Field Day, and I had come home to nap and hadn't unpacked my gear. The doublet was unconnected. I believe I would not have taken any damage had the antenna been properly grounded at the time. Today I ground all my antennas that are not in use. 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://www.qsl.net/donate.html
Re: [Elecraft] multi port usb hub and k3 KUSB
Some have had problems with non-powered hubs if other devices on the hub are busy and active at the same time. Apparently it doesn't happen all the time, but it does happen for some. On Tue, Apr 20, 2010 at 9:08 PM, Ken Kopp wrote: > Hello Garry, > > I have an 8-port hub running on this XP machine, > and a 4-port on a laptop with XP. > > Have had no issues.. > > 73! Ken Kopp - K0PP > elecraftcov...@rfwave.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 > __ 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
Re: [Elecraft] External Power Supply for the KPA-500
On Apr 20, 2010, at 1:45 PM, Lew Phelps K6LMP wrote: > You can't have it all -- legal limit amp, power supply for same, legal limit > ATU, etc. are incompatible with small size, light weight, and ability to run > on 110 VAC mains. you just can't shoehorn a "big gun" station into a > briefcase. Yet. Seriously. The K2/100 is ten-year-old technology. Yet it has way more functionality for its size and weight than transceivers that are ten or twenty years older. With advances in component miniaturization and material science, it will eventually be possible to have a legal limit rig with PS and ATU all in a package the size of the K3. Just not yet. 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://www.qsl.net/donate.html
Re: [Elecraft] Mea culpa (KPA-500)
Fred, I --think-- the estimated cost of the KPA500 you reference is in error by almost a factor of three. 73! Ken Kopp - K0PP elecraftcov...@rfwave.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
Re: [Elecraft] multi port usb hub and k3 KUSB
Hello Garry, I have an 8-port hub running on this XP machine, and a 4-port on a laptop with XP. Have had no issues.. 73! Ken Kopp - K0PP elecraftcov...@rfwave.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
Re: [Elecraft] multi port usb hub and k3 KUSB
Use a powered hub rather than non-powered. Pete, W1RM -Original Message- From: Phil Kane [mailto:k2...@kanafi.org] Sent: Tuesday, April 20, 2010 7:59 PM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] multi port usb hub and k3 KUSB On 4/20/2010 3:26 PM, Gary Slagel wrote: > Has anyone used some kind of a usb hub to hook multiple devices > to the laptop simultaneously? I have two such "generic" hubs hooked up to my laptop and they work perfectly with Win XP. -- 73 de K2ASP - Phil Kane Elecraft K2/100 s/n 5402 __ 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 __ 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
Re: [Elecraft] RS232 connectivity P3/KPA500
I guess the real questions is why it can not be a USB instead of an RS232. It would seem to me that USB would be much easire for all. -- View this message in context: http://n2.nabble.com/RS232-connectivity-P3-KPA500-tp4934093p4934464.html Sent from the [QRO] mailing list archive at 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
Re: [Elecraft] Grounding negative side of power supply?
At my shop sits my 100 ft tower for the 3 repeaters and one of my HF stations. Some 50 ft away is a old Hickory tree that's about 60 to 70 ft tall. Two years ago I received a lightning strike that destroyed the tree. No damage to the tower, any of the 12 antennas on the tower or any of the equipment in the two racks in the building. The tower and equipment was correctly and properly grounded. The tree wasn't. 73 Bob, K4TAX > On Tue, 20 Apr 2010 06:31:04 -0400, Tom W8JI wrote: > >>I'm not so sure we aren't getting carried away with our own >>interpretation of NEC rules here. We also have to apply a >>little technical "common sense" to our systems. > >>I have antennas and towers scatter over thousands of feet >>distance. It would be totally worthless and physically >>impossible to bond the ground rods on my antennas to my >>mains ground. The additional protection to my house and >>equipment, and to people, would be zero. > > Exactly. My interpretation is that NEC requires the bonding of > the shack, and coax entry points with power system ground and all > other grounds directly associated with the house, AND with a > tower physically attached to or very close to the house, but NOT > with a remotely located antenna or tower. > > My 120 ft tower is about 250 ft from the shack and 120 ft from > the house, and is well grounded at its base. It's surrounded by > several dozen redwoods, about half of which are at least 40 ft > taller. I've never considered bonding it to either structure, and > I wouldn't treat it differently even if the trees weren't there. > > 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 > __ 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
Re: [Elecraft] multi port usb hub and k3 KUSB
On 4/20/2010 3:26 PM, Gary Slagel wrote: > Has anyone used some kind of a usb hub to hook multiple devices > to the laptop simultaneously? I have two such "generic" hubs hooked up to my laptop and they work perfectly with Win XP. -- 73 de K2ASP - Phil Kane Elecraft K2/100 s/n 5402 __ 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
Re: [Elecraft] Mea culpa (KPA-500)
ynkedra...@aol.com wrote: > Thanks Wes, N7WS, for sending me back to my calculator. > > 500 watt output is indeed 7dB greater than 100 watts, not the > 5 dB > I previously stated. > > Even better. 7 dB is 1.1667 International Standard S-units. 10 dB [1KW vs 100W] is 1.6667 ISS-u. 1.1667 ISS-u can make a fair difference in a pile-up, 0.4999 ISS-u more -- mabye not so much. Capital Costs: The KPA500 is alleged to cost around $700. A good 1-1.5 KW solid state amp generally runs something over $2,000 and up. Operating Costs: @ 50% efficiency, 2KW averaged over the 48-hr CQ WPX CW [30% duty cycle, our hypothetical contester calls CQ continuously] @ $0.16/KWh will run him $28.80 and presumably other 48-hr marathons would do likewise [CW WPX SSB, CQ WW CW, CQ WW SSB, ARRL DX CW, ARRL DX SSB, ARRL SS CW, ARRL SS SSB] $230.40 for electricity. Snack food, aspirin, coffee to keep you awake through all these contests, and all the chores you have to do before/after the contest to "make it up" to you-know-who, are fixed costs -- equal for both amps. KAP500 looks like a good deal to me. Of course, there's the opportunity loss during NAQP's where you don't use the KPA500, but the six of them each year only last 10 hours each. This does not factor in replacement costs, which could be substantial in the case of the "big" amps. How much do 500 2N's cost? You can do the math. [Andrea is *very* happy our income when I was employed did not depend on my cost-benefit analysis skills :-)] 73, Fred K6DGW - Northern California Contest Club - CU in the 2010 Cal QSO Party 2-3 Oct 2010 - www.cqp.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
Re: [Elecraft] KUSB
Been right down that road. I have the KUSB. Prolific has a 4/12/2010 dated installer.zip at http://www.prolific.com.tw/support/files/%5CIO%20Cable%5CPL-2303%5CDrivers%20-%20Generic%5CWindows%5Callinone%5CPL2303_Prolific_DriverInstaller_v1210.zip Prolific drivers for Windows7/64 have been problematic, but the version prior to this one finally worked for me on Win7/64. Frankly, Win7/64 has been cranky to get going on peripherals, though I seem to have everything working now. There is a huge collection of fairly recent threads on this in the archives. 73, Guy. On Tue, Apr 20, 2010 at 5:43 PM, Peter Chamalian wrote: > I've just upgraded to a new computer with no serial ports so I need to be > able to update the firmware in my K3. I know the KUSB is available and from > what I read, it's a usb to serial cable to enable direct communication > between computer and radio. > > > > I'm running Windows 7, 64-bit computer. > > > > Has anyone run into problems with a KUSB and windows 7? Any suggested > alternatives? > > > > Thanks! > > > > Pete, W1RM > > > > __ > 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 > __ 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
Re: [Elecraft] RS232 connectivity P3/KPA500
Note that the KPA500 has them labeled "PC" and "xcvr", and that we already know that the P3 has a pass-through RS232 connection, so it appears the configurations are computer to KPA500, then another cable to the P3(if you have one) then another cable to the K3. N6TV's photo is good and the labels are readable: http://picasaweb.google.com/rawilson/2010VisaliaInternationalDXConvention#5461795493258994210 73, doug From: Doug Fleming Date: Tue, 20 Apr 2010 13:51:49 -0400 I noticed the P3 and KPA500 both have RS232 interconnection to the K3. I wonder if it will it be possible to have all three connected simultaneously and still have PC RS232 connectivity? ...or would that even be beneficial? __ 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
Re: [Elecraft] multi port usb hub and k3 KUSB
Gary, Not exactly ur situation but I have done it with a desktop. I do recommend a hub with its own power supply. They are priced inexpensively. Howard..K2HK > Date: Tue, 20 Apr 2010 15:26:51 -0700 > From: gdsla...@yahoo.com > To: elecraft@mailman.qth.net > Subject: [Elecraft] multi port usb hub and k3 KUSB > > Hi guys, > > I've got my new k3 hooked to the laptop using the KUSB and it worked FB first > time but, I'm going to be out of usb ports. I've got 2 ports. I'd like to > use the KUSB to the k3, a USB Winkey keyer and also a USB mouse and who > knows what down the road. > > Has anyone used some kind of a usb hub to hook multiple devices to the laptop > simultaneously? > > Thanks for any help. > > Gary/N0SXX > > > > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html __ 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
[Elecraft] RS232 connectivity P3/KPA500
I noticed the P3 and KPA500 both have RS232 interconnection to the K3. I wonder if it will it be possible to have all three connected simultaneously and still have PC RS232 connectivity? ...or would that even be beneficial? 73, Doug KF4VTT Sent from my iPhone __ 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
Re: [Elecraft] ERR TXG problem - PROBLEM SOLVED.
Hi all, just to tell you that problem is solved due to big help of Elecraft Support, in person of Gary AB7MY. I did a small mistake but tks help of Gary I was able to solve it and at same time the ERR TXG problem. Tks a lot all and long life for Electaft CT1DRB David Quental > David, Try the manual TX Gain as described on page 49 of the K3 Owner's > Manual. > > Select Ant 1 using the ANT pushbutton and check that the dummy load is > attached to Ant 1 out. > > 73, FRED, AE6IC, K3 #2241 > > > > __ > 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 > > __ 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
[Elecraft] multi port usb hub and k3 KUSB
Hi guys, I've got my new k3 hooked to the laptop using the KUSB and it worked FB first time but, I'm going to be out of usb ports. I've got 2 ports. I'd like to use the KUSB to the k3, a USB Winkey keyer and also a USB mouse and who knows what down the road. Has anyone used some kind of a usb hub to hook multiple devices to the laptop simultaneously? Thanks for any help. Gary/N0SXX __ 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
Re: [Elecraft] K3 - KPAIO3 'Puller'
Tom, wish I had had benefit of your invention a week ago, when I had to replace my defective KPAIO3 board. Without benefit of instruction of any sort, I just started in removing stuff that looked like it was in the way... I ended up removing quite a bit of stuff! The board eventually did come out, with the benefit of a good deal of that "wiggling" that you didn't like the sound of. Putting the new KPAIO3 board back in was even more difficult than getting the old one out, but I was finally able to find the correct angle to slip the board into insertion position past numerous obstacles. I was 90% sure that if the new KPAIO3 fixed the original problem, it would be a miracle, and that I had probably blown up all kinds of stuff with my necessarily aggressive pushing, prying, and pulling. However, when it was all back together, the original RF power problem was fixed, everything worked, I was relieved and happy -- and probably lucky. BTW, I did NOT build my K3; it was a factory job. I could have benefited from the experience, I'm sure. FWIW (in case this failure mode sounds suspiciously familiar to anybody), the original problem that prompted the replacement was a barely-intermittent (mostly fail mode) KPA3 power fault, where the K3 thought there was no 12VDC available for the power amplifier, and put itself into low-power mode as if the KPA3 wasn't installed. When completely cold and freshly powered up, the KPA3 would function for maybe one or two transmission periods, but on the next key-up, it would fail again and wouldn't come back without extended R&R. :-) The Elecraft techs felt it was probably a bad 12V sensor device on the KPAIO3, and it appears they were correct. No more problems after a week+ of operation. Bill W5WVO -- From: "Tom Hammond" Sent: Tuesday, April 20, 2010 5:08 AM To: Subject: [Elecraft] K3 - KPAIO3 'Puller' > Recently, I had to open up my K3 in order to perform a bit of > preventive maintenance, on the KPAIO3 PC board. This is the small PC > board which interfaces the KPA3 100W amp assembly to the RF board in > the Elecraft K3 HF transceiver. > > The job started off easy enough... remove the top cover, remove the > rear cooling fan assembly, remove the KPA3 PC board... I mean, it was > an easy thing to do... a small PC board... couldn't be all THAT > difficult to pull it straight up and out of the case, > right? WRONG! In order to ensure that the KPA3 doesn't accidentally > come loose during transport and handling, Elecraft chose to use some > REALLY husky dual-row multi-pin 'hi retention' headers to attach the > KPAIO3 to the RF board, and the same headers to attach the KPA3 to > the KPAIO3. The only difference is that if you must remove the KPA3 > from the clutches of the KPAIO3, you have a bit more available 'real > estate' to grasp (and pry) on than you do when it comes to removing > the KAPIO3 board. In fact, there was a point in time that I was > absolutely certain that my KPAIO3 had been soldered directly to the > RF board, it was that tightly held in place. > > Before I went too far and found myself ripping the guts of the RF > board out (because my KPAIO3 really WAS soldered to the RF board), I > called Elecraft and spoke with one of their techs who was very > familiar with the K3. Let me digress just a bit here... I did build > my K3 from a kit, but being serial #8 (and one of the first K3's > out of Aptos), it had been quite a while since the assembly, and I > didn't recall whether I'd installed my KPAIO3 or whether it'd been > pre-installed at the factory... so I called to confirm my > suspicions... that it really DID plug in. > > The tech assured me that it did plug into the RF board and he agreed > that it was a 'bear' to remove. He suggested 'wiggling' the PC board > (front-to-back) as I lifted it up, ever so gradually allowing it to > 'work' itself out of the death grip of the two headers. I considered > that scenario, but didn't care for the 'wiggling' part, feeling that > this only contributed to a possibly fractured PC board joint on one > (or more) of the header pins... > > The tech also suggested using some 'heavy wire' to make a loop to go > through two (2) available (and unused) holes in the KPAIO3 PC board, > with the loop tied together so I could lift on it and pull the PC > board straight out. > > THIS IDEA I LIKED...! > > I did a quick search of the shack and found little heavy wire, BUT I > did manage to locate what turned out to be a length of 0.125" (1/8") > O.D. aluminum welding rod. > > I checked that the rod just barely passed through the (2) holes in > the KPAIO3 PC board and was gratified to find that it did. > > I then took a few measurements and bent the rod into the lift bracket > shown below (note that the two vertical legs are different lengths), > cutting off the excess rod length after the final bend had been > made. I then used a fine file to smooth out
[Elecraft] KUSB
I've just upgraded to a new computer with no serial ports so I need to be able to update the firmware in my K3. I know the KUSB is available and from what I read, it's a usb to serial cable to enable direct communication between computer and radio. I'm running Windows 7, 64-bit computer. Has anyone run into problems with a KUSB and windows 7? Any suggested alternatives? Thanks! Pete, W1RM __ 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
[Elecraft] Mea culpa (KPA-500)
Thanks Wes, N7WS, for sending me back to my calculator. 500 watt output is indeed 7dB greater than 100 watts, not the > 5 dB I previously stated. Even better. 73, Blair K3YD __ 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
Re: [Elecraft] Grounding negative side of power supply?
On Tue, 20 Apr 2010 16:19:47 -0400, Tom W8JI wrote: >I disagree only on this one point Ed. The entrance ground >must be bonded to the mains ground. Not doing so sets us up >for very big problems. RIGHT ON. 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
[Elecraft] KPA-500 - Heat
What are the comparitive amounts of heat produced in a solid-state amplifier in the RF section vs. the Power Supply section? 73, Dick - KA5KKT __ 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
Re: [Elecraft] KPA-500; meets many needs
Yep, 7 dB is better than 5 dB. ;-) --- On Tue, 4/20/10, ynkedra...@aol.com wrote: > Is 500 watts not enough? For the rarest of the rare > DX, for top-ten contest results, maybe not. But it is > a better-than-5 dB improvement from exciter level. __ 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
[Elecraft] KX-1: slightly deaf on 20m
I have always felt that on 20m the KX-1 is much quieter in terms of background noise compared with the 3 other bands. Having just bought a XG2 on ebay, I have been comparing receive performance at the 1uV level between 40m and 20m. There's no doubt that the s/n ratio on 40m is better by several dB (not measured, so a subjective observation). I have checked the alignment by adjustment of the trimmers 20a and 20b and found that the tuning was already pretty much on the nose. So the question is, is there anywhere else I should look? I have checked both with and without the built-in ATU and reached the same conclusion. I'd be grateful for any pointers. Tnx and 73 Stephen G4SJP __ 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
Re: [Elecraft] Grounding negative side of power supply?
<<>> I disagree only on this one point Ed. The entrance ground must be bonded to the mains ground. Not doing so sets us up for very big problems. As a matter of fact the better we ground our entrance panels and our antennas, the more we set ourselves up for problems from hits on the power line or power line faults. My ground bonding connection runs directly under the house with wide flashing to my mains ground. I also have a halo ground surrounding the house that bonds my TV tower and everything else entering the house to my mains ground and entrance ground. 73 Tom __ 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
Re: [Elecraft] : Re: News from Visalia! (:-))
> Did I read that the two finals in the KPA500 were push-pull? That's typical of these designs. The Grandberg design uses the four MRF-150s in parallel/push-pull (two FETs on either side). 73, ... Joe, W4TV > -Original Message- > From: guyk...@gmail.com [mailto:guyk...@gmail.com] On Behalf > Of Guy Olinger K2AV > Sent: Tuesday, April 20, 2010 9:06 AM > To: Joe Subich, W4TV > Cc: lrom...@ij.net; Jim Brown; Elecraft > Subject: Re: [Elecraft] : Re: News from Visalia! (:-)) > > > Did I read that the two finals in the KPA500 were push-pull? > > 73, Guy > > On Tue, Apr 20, 2010 at 2:21 AM, Joe Subich, W4TV > wrote: > > > > > >> I'm just stating my opinion that, in the big picture, the > price point > >> for the KPA500 seems a bit on the high side for what you get. Now > >> seeing photos, its certainly better looking than my > ALS600. And the > >> build quality is probably better than my Ameritron > product, but for > >> that power level, and taking into account the value of my > time if I > >> had to build it, the cost is a bit high in my opinion. > > > > Taking this one step further, the KPA-500 may have an > updated design - > > after all the ALS-600 is a close copy of Granberg's 20 year > old design > > (Motorola Engineering Bulletin # 104) - but other than the > > microprocessor control in the KPA-500, the bill of > materials should be > > fairly similar for the KPA-500 and the ALS-600. > > > > The FETs in the KPA-500 will be slightly more expensive (2 x $87 in > > the KPA-500 vs. 4 x $36 in the ALS-600 for Q=1000) but the > differences > > should be offset at least in part by easier assembly and > calibration. > > I would expect the KPA-500 to sell for no more than 20% above the > > street price of the ALS-600 with linear supply. Any more > than that is > > difficult to justify ... after all, a watt is a watt. > > > > 73, > > > > ... Joe Subich, W4TV > > > > > > > > > >> -Original Message- > >> From: elecraft-boun...@mailman.qth.net > >> [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of > Luis V. Romero > >> Sent: Monday, April 19, 2010 11:51 PM > >> To: 'Jim Brown' > >> Cc: 'Elecraft' > >> Subject: [Elecraft] : Re: News from Visalia! (:-)) > >> > >> > >> I wrote that statement, Jim: > >> > >> I'm just stating my opinion that, in the big picture, the > price point > >> for the KPA500 seems a bit on the high side for what you get. Now > >> seeing photos, its certainly better looking than my > ALS600. And the > >> build quality is probably better than my Ameritron > product, but for > >> that power level, and taking into account the value of my > time if I > >> had to build it, the cost is a bit high in my opinion. > >> > >> I'm not in this to have a pretty shack to impress my friends with > >> lots of lights, gingerbread and ham status symbols. If I > were into > >> that, I would take out a 2nd mortgage and buy a 7800/PW1. :) > >> > >> Maybe I'm "cheap", maybe not. After all, I do own a rather well > >> equipped K3. But with two kids in college and a mortgage > payment in > >> today's economy, what I have does an admirable job. I did > have to do > >> "final QC" on my ALS600, and I did have to integrate a > band decoder > >> to it to switch bands from the radio, and I did have to > install Phil > >> AD5X's marvelous little QSK board, but the K3/ALS600/MFJ998 > >> combination I currently operate does exactly what it needs to > >> do with little fuss and surprisingly high reliability at a > >> very reasonable price point. > >> > >> While its true that you get what you pay for, as I used to > say when I > >> was in TV and purchased EFP cameras instead of the 5 times more > >> expensive studio versions of the same thing for my > station. "Nobody > >> at home can see the difference". > >> > >> It would be nice to have a matching amp and panadapter to > go with my > >> K3. The Panadapter is well priced for what you get, what > it is, and > >> for its computer-less feature set, and I will probably end up with > >> one of those next year. > >> > >> The KPA500, in my personal environment, is not. > >> > >> Again, my opinion, and your mileage will indeed vary. > Matching boxes > >> are not high on my priority list because, well, "You cant hear the > >> difference at home". > >> > >> -lu-w4lt- > >> > >> > >> Date: Mon, 19 Apr 2010 09:59:58 -0700 > >> From: "Jim Brown" > >> Subject: Re: [Elecraft] News from Visalia! (:-)) > >> To: "Elecraft" > >> Message-ID: <2010041917.2a58c58...@gw1.nlenet.net> > >> Content-Type: text/plain; charset="us-ascii" > >> > >> On Sun, 18 Apr 2010 16:16:58 -0400, Terry Posey wrote: > >> > >> >ALS600 with the Linear Power supply, AD5X Full Break In > mod and an > >> >external bandswitching accessory plus an MFJ998 would come in > >> >considerably under the $2,000 price. > >> > >> Do I understand that you are equating MFJ with Elecraft? > That's quite > >> a stretch! Wh
[Elecraft] KPA-500; meets many needs
Guess it depends on operations and locations, but I see the KPA-500 meeting some broad operating needs. I frequently operate portable, for contests, and enjoy a power boost above exciter level power. I've looked at the somewhat portable ACOM 1010, but it lacks 6 meter coverage and full break-in. Tokyo High Power? Similar band coverage and QSK issues; can be a little more portable. The Ameritron (MFJ) solid state amp? Again 6 meters and QSK are lacking. Also, I've had too many QC issues with that company's products. YMMV. So, the '500 appears to offer a very compact (K3 size, 22 lb.) package, full 160-6 meter coverage and QSK--all with internal power supply. Sounds like a traveler's delight to me as well as being a medium-power level amp for home use. What's not to like? I hear wishes for a built-in antenna tuner. For some people that's a need, for others a non-issue. When I use a tuner it's a Johnson matchbox with ladder line into the shack. If I'm using a coax-fed antenna, I will work it, and work it, work it some more till it is resonant and no tuner is necessary. That's me. Is 500 watts not enough? For the rarest of the rare DX, for top-ten contest results, maybe not. But it is a better-than-5 dB improvement from exciter level. There were recently expressed wishes from some on this reflector for a 150~200 watt PA. Here's an amp that, with reduced drive, gives that sought-after power output level. The 500 watt power level is also compatible with the power limits in many European countries. Do I like what I see so far? Yes. 73, Blair K3YD __ 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
[Elecraft] RES: K3 birdies
Hi Guys: I do have 4(tour) K3 and I really don´t understand why Elecraft is not taking care of it. This is (my opinion) ridiculous!!! Everyone is making serious comments on this issue and no effective actions??? Oms PY5EG -Mensagem original- De: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] Em nome de Guy Olinger K2AV Enviada em: terça-feira, 20 de abril de 2010 12:27 Para: Tom W8JI Cc: elecraft@mailman.qth.net; lstavenhagen Assunto: Re: [Elecraft] K3 birdies Routing the cables when adding the second RX was very tricky and caused birdies to appear and disappear while being moved around. Though it is an added cost, a premade wiring harness to enforce a tested good routing would be useful. Or perhaps if there was an actual size template of a wiring harness to be assembled as part of the kit, with some pre-printed stickers to put on the cables. Precise routing is fairly left to chance as currently implemented. I also hear far less birdies (next to none relatively) tuning across the band in CW, vs. SSB. To be fair, most birdies are buried in a busy band without effect, and require a dead band to hear them. In mine there were three that were obnoxious enough to bother killing them with the menu device. I do NOT experience related audio gaps as reported by some others. I DO get gaps if I overcorrect. 73, Guy. On Tue, Apr 20, 2010 at 10:34 AM, Tom W8JI wrote: > My K3 with the second receiver does not seem to have these > problems either. > > > - Original Message - > From: "lstavenhagen" > To: > Sent: Tuesday, April 20, 2010 10:02 AM > Subject: Re: [Elecraft] K3 birdies > > > > I can only reproduce the birdie on 80M (and there are > actually two very close > together, one of which turns on as you tune up the band and > then off as you > go down. They're at about S2 or 3). > But I have very few options installed, the KAT3 and one > extra roofing filter > and that's it. Maybe these come in with other options like > the second RX? > > Heaven compared to my 706MKIIG which has birdies all over > the place, hi > hi > > Mine is K3 #4116. > > 73, > LS > W5QD > -- > View this message in context: > http://n2.nabble.com/K3-birdies-tp4927074p4931258.html > Sent from the Elecraft mailing list archive at 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: A known bad url was replaced by VIPRE > Please help support this email list: A known bad url was > replaced by VIPRE > > __ > 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 > __ 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 __ 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
Re: [Elecraft] External Power Supply for the KPA-500
Pretend for the moment that you are Elecraft. Everyone needs a power supply, but not everyone needs a tuner. Of those who need a tuner, not everyone needs one with the same range (a larger issue at high power than it is at low power), and some strongly prefer to have a remote tuner anyway. So which makes more sense to package with the amplifier? 73, Dave AB7E From: ANTNEE N3ANT Subject: [Elecraft] External Power Supply for the KPA-500 To: elecraft@mailman.qth.net Date: Tuesday, April 20, 2010, 7:15 AM Hello All, Just a thoughtbut how about a external power supply for the KPA-500 ? It would leave plenty of room for a built In antenna tuner ? 73 de Antnee N3ANT __ 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
Re: [Elecraft] K3 birdies
When I built my K3 (with the 2nd receiver) well over a year ago I had lots of birdies between on most of the bands, although very few on 80m. With a dummy load on the antenna port, I logged any birdie S2 or greater (I have a really low noise level at this QTH) and then monitored them all (yes, all of them) as I played around with various cable positions. It soon became obvious that eliminating one birdie often strongly accentuated a different one, so I spent a lot of time trying to find a decent middle ground and then did my best to hold the cables in those positions with cable ties and tape. The SIG RMV software fix that came out a few weeks later was a remarkably innovative godsend and totally fixed any remaining issues. I tried some out-of-the box methods to reduce the birdies before the software fix came out. One was to buy a sheet of anti-static material (carbon impregnated foam), cut it into sections that fit into sandwich baggies, connect a wire to each of them that could be grounded to the case inside the K3, and position them around the various cables. The idea was to create some sort of lossy shielding to reduce the coupling. It actually helped a bit, but it made a large difference where I connected the wires to ground (understandable since the wire now also act as antennas) and the overall improvement wasn't worth the hassle. By the way, the 2nd receiver is FAR better shielded and I could find only a couple of very weak birdies on it, while I had thirty or more S2 or above (roughly half of which were S3 and about four at S4) on the main receiver. Since I assembled everything before checking for birdies I never did a comparison of main receiver birdies with and without the 2nd receiver installed, but based upon my experience with various cable placements it is my strong belief that having the 2nd receiver installed makes the birdies worse in the main receiver, presumably because the shield of the 2nd receiver creates more coupling between the cables behind the front panel. I still have a couple of birdies on certain frequencies that I never use and haven't bothered with, and as might be expected they are STRONGLY microphonic. Tapping on the case while listening to them can be almost startling. It always made me wonder what the transmitted signal would sound like on the birdie frequencies if the rig was "physically modulated" by other gear on the desk, or even through the air, but I haven't walked myself through the frequency chain to see if it would even be relevant. 73, Dave AB7E On 4/20/2010 8:26 AM, Guy Olinger K2AV wrote: > Routing the cables when adding the second RX was very tricky and > caused birdies to appear and disappear while being moved around. > Though it is an added cost, a premade wiring harness to enforce a > tested good routing would be useful. > > Or perhaps if there was an actual size template of a wiring harness to > be assembled as part of the kit, with some pre-printed stickers to put > on the cables. > > Precise routing is fairly left to chance as currently implemented. > > I also hear far less birdies (next to none relatively) tuning across > the band in CW, vs. SSB. > > To be fair, most birdies are buried in a busy band without effect, and > require a dead band to hear them. In mine there were three that were > obnoxious enough to bother killing them with the menu device. I do > NOT experience related audio gaps as reported by some others. I DO > get gaps if I overcorrect. > > 73, Guy. __ 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
[Elecraft] [K3] 1.0 Milliwatt Calibration
I was wondering why my 2m transverter was producing much less output than when I set it up, so I thought that perhaps I should do the 1 Milliwatt calibration procedure, which I never have done. I don't, unfortunately, have an accurate RF voltmeter, but I do have an Elecraft DL1 and a DVM. At 1mW requested power I measured 36mV at the DL1 test point, which according to the formula (.036 x 1.414) + 0.15)^2 / 50 means I am only getting 0.8mW out. Is it OK to use the DL1 and this formula at this power level? - Julian, G4ILO. K2 #392 K3 #222. * G4ILO's Shack - http://www.g4ilo.com * KComm - http://www.g4ilo.com/kcomm.html * KTune - http://www.g4ilo.com/ktune.html -- View this message in context: http://n2.nabble.com/K3-1-0-Milliwatt-Calibration-tp4932981p4932981.html Sent from the Elecraft mailing list archive at 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
Re: [Elecraft] Grounding negative side of power supply?
-- Message: 26 Date: Tue, 20 Apr 2010 06:31:04 -0400 From: "Tom W8JI" Subject: Re: [Elecraft] Grounding negative side of power supply? To: "Bob McGraw - K4TAX" , "Jim Brown" ,"Elecraft List" Message-ID: <321074f178104f4fab7715a73e6d1...@radioroom> Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original I'm not so sure we aren't getting carried away with our own interpretation of NEC rules here. We also have to apply a little technical "common sense" to our systems. I have antennas and towers scatter over thousands of feet distance. It would be totally worthless and physically impossible to bond the ground rods on my antennas to my mains ground. The additional protection to my house and equipment, and to people, would be zero. In addition to no improvement in protection, the effectiveness of the low-noise antennas would be greatly decreased. Then we have to consider odds that power lines, trees, and our large towers would be ignored by lightning and a small ten-foot-tall twenty-foot-long, antenna would be struck. If it were struck, where would the majority charges move? In the feeder to the house. If the feeder ground were bonded to the mains ground at the building entrance, the safety issue for people and the dwelling is closed at that point. The ground at the dwelling entrance, that is mandated by NEC to be bonded to the mains ground, is key to safety. Not the critical signal ground at some backyard clothesline antenna. I also frequently hear that "insurance disallowed" statement. If insurance was "disallowed" for a NEC safety or rule violation, very few claims would ever be paid. In my entire life I can't recall having a claim denied because of something like this. I would bet well over half of Ham stations lack a proper entrance or station ground bonded to the mains ground, but I don't recall ever knowing of a claim disallowed for that gross error. 73 Tom === Tom, and all: Have to agree with you. Hundreds of feet of electrical ground wire from antennas? Not even sure that would work for lightening. I have a ground rod at the base of my 600m inverted-L antenna (RF ground) and the 2-ft wide x 50-foot to 70-foot long radials are connected there. Z = 18 - j681.5 Rad = 0.8 ohms so most is ground loss I have a 120-foot run of 1-5/8 inch LDF7-50A Heliax that is grounded at the base of the tower and at the cable entrance to the shack. The cable entrance is a 12x 16 inch aluminum plate that has 26 coaxial feed thru connectors (I have over 17 antennas). The mains (electrical meter box) is grounded on the other side of the house so to bond them would take 50+28+50= 128 feet of ground wire. That might be effective if It was #6 or larger. I got better places to spend money. My Beverage antenna has two ground rods at either end but is 150-feet from the cable entrance. I have begun using ferrite RF Chokes a lot on my coax with excellent results. They are not expensive and nicer to look at then a big coil of coax. 73, Ed - KL7UW, WD2XSH/45 == BP40IQ 500 KHz - 10-GHz www.kl7uw.com EME: 144-600w, 432-100w, 1296-60w, 3400-fall 2010 DUBUS Magazine USA Rep dubus...@hotmail.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
Re: [Elecraft] External Power Supply for the KPA-500
I am running a Expert 1K-FA 1KW amplifier on 120 VAC with no problems. Jack W4GRJ -Original Message- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Lew Phelps K6LMP Sent: Tuesday, April 20, 2010 1:46 PM To: Elecraft Subject: Re: [Elecraft] External Power Supply for the KPA-500 It's probably possible to build a KW power supply into a K3 enclosure, but a power supply of that output would absolutely require 220VAC lines, which I believe is one of the reasons Elecraft focused on the 500 watt amplifier size. 500 watts is about the limit for running an amplifier from 110 VAC mains, and requiring access to a 220VAC outlet runs against the grain of the portability that has always been an Elecraft hallmark. You can't have it all -- legal limit amp, power supply for same, legal limit ATU, etc. are incompatible with small size, light weight, and ability to run on 110 VAC mains. you just can't shoehorn a "big gun" station into a briefcase. Elecraft does not have unlimited resources. They have done very well in targeting market niches that other manufacturers don't serve. There are already very good and fairly reasonably priced high-output amps on the market, and I think Elecraft would have a difficult time differentiating itself from those products, in either performance or price, except to the relatively small extent that you can save $$ by building your own kit. But heck, there are even kit form KW amplifiers on the market. Let's all step back, take a deep breath, exhale, and be thankful for the great job Elecraft has done in developing and introducing two apparently wonderful new products at the same time. Lew K6LMP On Apr 20, 2010, at 10:27 AM, Edward Dickinson, III wrote: > > Would moving the Power Supply out of the KPA500 enclosure leave room for a > 2nd 500 RF deck inside the K3-sized enclosure? Could two 500 Power supplies > fit in another K3-sized enclosure? > __ 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 __ 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
Re: [Elecraft] Grounding negative side of power supply?
On Tue, 20 Apr 2010 06:31:04 -0400, Tom W8JI wrote: >I'm not so sure we aren't getting carried away with our own >interpretation of NEC rules here. We also have to apply a >little technical "common sense" to our systems. >I have antennas and towers scatter over thousands of feet >distance. It would be totally worthless and physically >impossible to bond the ground rods on my antennas to my >mains ground. The additional protection to my house and >equipment, and to people, would be zero. Exactly. My interpretation is that NEC requires the bonding of the shack, and coax entry points with power system ground and all other grounds directly associated with the house, AND with a tower physically attached to or very close to the house, but NOT with a remotely located antenna or tower. My 120 ft tower is about 250 ft from the shack and 120 ft from the house, and is well grounded at its base. It's surrounded by several dozen redwoods, about half of which are at least 40 ft taller. I've never considered bonding it to either structure, and I wouldn't treat it differently even if the trees weren't there. 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
Re: [Elecraft] External Power Supply for the KPA-500
probably not enough room for the FANS :) bill At 01:27 PM 4/20/2010, Edward Dickinson, III wrote: >Would moving the Power Supply out of the KPA500 enclosure leave room for a >2nd 500 RF deck inside the K3-sized enclosure? Could two 500 Power supplies >fit in another K3-sized enclosure? __ 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
[Elecraft] 2N2222 Final
I missed reading Vol. 72, issue 22 of the Elecraft Digest so got a chuckle with this one.but I am using a 2N as an 18-dB buffer amp following my K3. This is on 500-KHz running the K3 in TEST mode where the output is ~ 1mw via the KXV3 option. I run 0.25 to 0.62 mw to drive the 2N up to 10mw output. This then drives a converted Non-Directional Beacon (NDB) transmitter to 100w in CW/QRSS/PSK-31/WSPR (the legal modes for the ARRL Experimental Group on 600 meter band). The NDB originally had a xtal controlled oscillator using SSB+carrier for pseudo-AM MCW ID in morse code. A happy coincidence is that the drive requirement suited the K3 in TEST mode. The NDB pre-driver stage is also a 2N. You can see the details of my 600m station at: http://www.kl7uw.com/600m.htm -- Message: 37 Date: Fri, 16 Apr 2010 16:53:26 -0700 From: Fred Jensen Subject: Re: [Elecraft] KPA500 To: Elecraft Reflector Message-ID: <4bc8f876.7000...@foothill.net> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Joe Planisky wrote: > Nah. It'll be 500 2N's. Wayne had a bunch left over from some > QRP projects and had to find a way to get rid of them. :-) Thank you Joe, a breath of humor 73, Fred K6DGW - Northern California Contest Club - CU in the 2010 Cal QSO Party 2-3 Oct 2010 - www.cqp.org 73, Ed - KL7UW, WD2XSH/45 == BP40IQ 500 KHz - 10-GHz www.kl7uw.com EME: 144-600w, 432-100w, 1296-60w, 3400-fall 2010 DUBUS Magazine USA Rep dubus...@hotmail.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
[Elecraft] Leakage Flux from Toroidal Transformer
On Tue, 20 Apr 2010 07:22:33 +0100, Ian White GM3SEK wrote: >Obviously the answer will also depend on the quality of design and >construction, not only in the transformer but also in the rest of the >amplifier, because flux leakage is also affected by the external >connecting wires. For the lowest possible flux leakage, it is important >to minimize the physical size of the 'coupling loops' created by the >connecting wires, especially if the stray magnetic fields can also >interact with a steel chassis. I never bothered to figure out why, but the first family of Crown audio power amps that used toroidal power transformers had BODACIOUS levels of leakage flux that could drive you NUTS in a live situation, when they coupled into line level audio circuits. We had to solve that by physically rotating them. 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
Re: [Elecraft] External Power Supply for the KPA-500
It's probably possible to build a KW power supply into a K3 enclosure, but a power supply of that output would absolutely require 220VAC lines, which I believe is one of the reasons Elecraft focused on the 500 watt amplifier size. 500 watts is about the limit for running an amplifier from 110 VAC mains, and requiring access to a 220VAC outlet runs against the grain of the portability that has always been an Elecraft hallmark. You can't have it all -- legal limit amp, power supply for same, legal limit ATU, etc. are incompatible with small size, light weight, and ability to run on 110 VAC mains. you just can't shoehorn a "big gun" station into a briefcase. Elecraft does not have unlimited resources. They have done very well in targeting market niches that other manufacturers don't serve. There are already very good and fairly reasonably priced high-output amps on the market, and I think Elecraft would have a difficult time differentiating itself from those products, in either performance or price, except to the relatively small extent that you can save $$ by building your own kit. But heck, there are even kit form KW amplifiers on the market. Let's all step back, take a deep breath, exhale, and be thankful for the great job Elecraft has done in developing and introducing two apparently wonderful new products at the same time. Lew K6LMP On Apr 20, 2010, at 10:27 AM, Edward Dickinson, III wrote: > > Would moving the Power Supply out of the KPA500 enclosure leave room for a > 2nd 500 RF deck inside the K3-sized enclosure? Could two 500 Power supplies > fit in another K3-sized enclosure? > __ 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
[Elecraft] P3 internal Power Supply Question
Probably premature to ask this but I understand the P3 has some empty space which some have suggested might accomodate a power supply for the attached K3. An example might be an Astron SS-30 removed from it's housing...footprint approximately 4.5 x 5.5" Does anyone have info on the dimensions of the unused floor space in the P3? __ 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
Re: [Elecraft] External Power Supply for the KPA-500
Would moving the Power Supply out of the KPA500 enclosure leave room for a 2nd 500 RF deck inside the K3-sized enclosure? Could two 500 Power supplies fit in another K3-sized enclosure? 73, Dick - KA5KKT Hello All, Just a thoughtbut how about a external power supply for the KPA-500 ? It would leave plenty of room for a built In antenna tuner ? 73 de Antnee N3ANT I agree, I don't mind an under the counter supply. Mel, K6KBE I think an internal power supply for the KPA500 with an external ATU from Elecraft makes a lot more sense. The power supply is very likely to be a dedicated supply due to voltage level and current draw requirements but a good external and self-contained auto-tuner (legal limit would be nice) from Elecraft would be a very popular product. 73, phil, K7PEH I suspect that the KPA500 will bootstrap Elecraft into a higher-power amp in the same size box with an external power supply, but that's wild speculation. 73, doug __ 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
Re: [Elecraft] External Power Supply for the KPA-500
On 4/20/2010 9:35 AM, Paul Christensen wrote: > I may have missed it, but I would like to know more about the KPA500's T/R > function -- namely, is it 100% electronic with PIN diode switching? Or, are > frame and/or vacuum relays used at the amp input and output? A silent, > PIN-diode switched amp would be commensurate with the K3's excellent T/R > function. It's silent solid-state. -- Vic, K2VCO Fresno CA http://www.qsl.net/k2vco/ __ 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
[Elecraft] [K3] MD3; or MD7; command changes VFO B filter settings
Hi all, I have noticed that when I send an MD3; or MD7; command to my K3 (which sets the VFO A mode to CW or CW REV respectively), the VFO B filter settings (selected filter, filter shift and width) are changed to the values that are currently active for VFO A. This happens with both 3.77 and 3.79 firmware. VFO B must already be in CW mode for this phenomenon to occur. Can anyone reproduce this? 73, Frank PA4N P.S. Maybe this phenomenon is a side effect of the following. In general, the MD command only acts on VFO A. (The MD$ command is the equivalent command for VFO B.) However, if VFO A and B are both in CW mode and you send a MD7; (CW REV) command to VFO A, *both* VFOs are set to CW REV. Apparently, the normal / rev setting applies to the whole K3, not just one VFO. This makes sense. However, I wouldn't expect *all* VFO A settings to be copied over to VFO B when an MD3; or MD7; command is issued. __ 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
Re: [Elecraft] External Power Supply for the KPA-500
http://www.w5dxp.com/notuner.htm --- On Tue, 4/20/10, Doug Faunt N6TQS +1-510-655-8604 wrote: > as well as intersting things like the fellow (I can't find > the URL > right now) who switches binary weighted lengths of > twin-lead feeder in > and out to match his wire to his radio. __ 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
Re: [Elecraft] External Power Supply for the KPA-500
>I think an internal power supply for the KPA500 with an external ATU from >Elecraft makes a lot more sense. I like the remote-ATU idea, especially, if it incorporates an auto-tune feature as well as a means to integrate switched antenna ports. A 500W auto-tuner with say...six SO-239 ports would be great. Those needing more ports? Perhaps an expansion capability. I may have missed it, but I would like to know more about the KPA500's T/R function -- namely, is it 100% electronic with PIN diode switching? Or, are frame and/or vacuum relays used at the amp input and output? A silent, PIN-diode switched amp would be commensurate with the K3's excellent T/R function. Presently, I am using a SPE 1K-FA amp and although the amp is compact and has been reliable for me, the T/R switching function is quite noisy. To deal with the noise issue, I modified an Ameritron QSK-5 and the T/R timing/bias function is now better than the stock system: http://72.52.250.47/images/QSK-5-Interface.pdf Added to the noise is the fact that the SPE's cooling fans begin getting noisy when the PA reaches above 100-degrees C. By the time the PA reaches 150-degrees C, it's as if an F-18 Hornet is taking off from my desktop. If the Elecraft folks can apply their same know-how to the KPA500 as they did with the K3's cooling system, I think few folks will be complaining about cooling noise. Paul, W9AC __ 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
Re: [Elecraft] External Power Supply for the KPA-500
Hm, the difference is that not everyone needs a automatic antenna tuner and everyone needs the power supply. If you have one of them external, there are strong arguments for it being the antenna tuner. We have tuneable antennas, and many other antennas run fine without a tuner. And the options for an antenna tuning unit include automatic tuners, simple manual all-band boxes, and per-band matching networks, as well as intersting things like the fellow (I can't find the URL right now) who switches binary weighted lengths of twin-lead feeder in and out to match his wire to his radio. I suspect that the KPA500 will bootstrap Elecraft into a higher-power amp in the same size box with an external power supply, but that's wild speculation. 73, doug Date: Tue, 20 Apr 2010 09:09:14 -0700 (PDT) From: Mel Farrer I agree, I don't mind an under the counter supply. Mel, K6KBE --- On Tue, 4/20/10, ANTNEE N3ANT wrote: Subject: [Elecraft] External Power Supply for the KPA-500 Date: Tuesday, April 20, 2010, 7:15 AM Hello All, Just a thoughtbut how about a external power supply for the KPA-500 ? It would leave plenty of room for a built In antenna tuner ? __ 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
Re: [Elecraft] K3 birdies
<< Routing the cables when adding the second RX was very tricky and caused birdies to appear and disappear while being moved around. Though it is an added cost, a premade wiring harness to enforce a tested good routing would be useful.>> If that is a problem, then maybe a better solution would be a few ferrite beads over certain cables or some better grounding? I assume it is the coaxial cables that affect the birdies? __ 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
Re: [Elecraft] External Power Supply for the KPA-500
I think an internal power supply for the KPA500 with an external ATU from Elecraft makes a lot more sense. The power supply is very likely to be a dedicated supply due to voltage level and current draw requirements but a good external and self-contained auto-tuner (legal limit would be nice) from Elecraft would be a very popular product. 73, phil, K7PEH On Apr 20, 2010, at 9:09 AM, Mel Farrer wrote: > I agree, I don't mind an under the counter supply. > > Mel, K6KBE > > --- On Tue, 4/20/10, ANTNEE N3ANT wrote: > > From: ANTNEE N3ANT > Subject: [Elecraft] External Power Supply for the KPA-500 > To: elecraft@mailman.qth.net > Date: Tuesday, April 20, 2010, 7:15 AM > > > Hello All, Just a thoughtbut how about a external power supply for the > KPA-500 ? It would leave plenty of room for a built In antenna tuner ? > > 73 de Antnee N3ANT > -- > View this message in context: > http://n2.nabble.com/External-Power-Supply-for-the-KPA-500-tp4931334p4931334.html > Sent from the Elecraft mailing list archive at 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 > > > > > __ > 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 __ 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
Re: [Elecraft] External Power Supply for the KPA-500
I agree, I don't mind an under the counter supply. Mel, K6KBE --- On Tue, 4/20/10, ANTNEE N3ANT wrote: From: ANTNEE N3ANT Subject: [Elecraft] External Power Supply for the KPA-500 To: elecraft@mailman.qth.net Date: Tuesday, April 20, 2010, 7:15 AM Hello All, Just a thoughtbut how about a external power supply for the KPA-500 ? It would leave plenty of room for a built In antenna tuner ? 73 de Antnee N3ANT -- View this message in context: http://n2.nabble.com/External-Power-Supply-for-the-KPA-500-tp4931334p4931334.html Sent from the Elecraft mailing list archive at 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 __ 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
[Elecraft] FOR SALE: ELecraft W1 Wattmeter Kit
FOR SALE: Elecraft W1 Wattmeter Kit new in bag never openned. Won at Visalia. $80 shipping Priority Mail included. Money Order preferred. Please contact me directly. 73 Elliott WA6TLA __ 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
Re: [Elecraft] K3 birdies
Routing the cables when adding the second RX was very tricky and caused birdies to appear and disappear while being moved around. Though it is an added cost, a premade wiring harness to enforce a tested good routing would be useful. Or perhaps if there was an actual size template of a wiring harness to be assembled as part of the kit, with some pre-printed stickers to put on the cables. Precise routing is fairly left to chance as currently implemented. I also hear far less birdies (next to none relatively) tuning across the band in CW, vs. SSB. To be fair, most birdies are buried in a busy band without effect, and require a dead band to hear them. In mine there were three that were obnoxious enough to bother killing them with the menu device. I do NOT experience related audio gaps as reported by some others. I DO get gaps if I overcorrect. 73, Guy. On Tue, Apr 20, 2010 at 10:34 AM, Tom W8JI wrote: > My K3 with the second receiver does not seem to have these > problems either. > > > - Original Message - > From: "lstavenhagen" > To: > Sent: Tuesday, April 20, 2010 10:02 AM > Subject: Re: [Elecraft] K3 birdies > > > > I can only reproduce the birdie on 80M (and there are > actually two very close > together, one of which turns on as you tune up the band and > then off as you > go down. They're at about S2 or 3). > But I have very few options installed, the KAT3 and one > extra roofing filter > and that's it. Maybe these come in with other options like > the second RX? > > Heaven compared to my 706MKIIG which has birdies all over > the place, hi > hi > > Mine is K3 #4116. > > 73, > LS > W5QD > -- > View this message in context: > http://n2.nabble.com/K3-birdies-tp4927074p4931258.html > Sent from the Elecraft mailing list archive at 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: A known bad url was replaced by VIPRE > Please help support this email list: A known bad url was > replaced by VIPRE > > __ > 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 > __ 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
Re: [Elecraft] Remotable external tuner
Hi Dick,
I would think so, but it doesn't strike me that they need the help. My
understanding is that they tuners they currently sell are very good. It
probably wouldn't be too much of a stretch to take a proven performer, modify
it according to some of the wish list items floating around and provide a
weatherproof cabinet for it.
73 - Ken
--- On Tue, 4/20/10, Edward Dickinson, III wrote:
> From: Edward Dickinson, III
> Subject: Re: [Elecraft] Remotable external tuner
> To: elecraft@mailman.qth.net
> Date: Tuesday, April 20, 2010, 3:03 AM
> Hi Ken.
>
> Do you think it is possible for Elecraft to acquire
> influence with a not yet
> mature autotuner manufacturer and provide guidance in a
> manner beneficial to
> Elecraft enthusiasts?
>
>
> 73,
> Dick - KA5KKT
>
>
>
>
> All of the above ("below" actually) for me as well, but
> please, not just a
> 500W model. Way too expensive. Looking at SGC's
> website as an example, a
> 500W remote autotuner costs 3 times as much as a 100W model
> and twice as
> much as a 200W unit.
>
> Maybe you can make power rating an option...with the brains
> of the tuner on
> one board and the brawny, power-rated components on a
> separate board? Order
> the combination of boards to match your
> circumstances. Just a thought.
>
> 73,
>
> Ken Alexander
> VE3HLS
>
>
>
> __
> Elecraft mailing list
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>
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Re: [Elecraft] K3 - KPAIO3 'Puller'
Tom, Thanks for the tip and diagram. I'll file that one for possible use later. --Dave, W8OV On 4/20/2010 6:08 AM, Tom Hammond wrote: > > http://www.n0ss.net/kpaio3_pcb_puller_v1r1.pdf > > 73, > > Tom Hammond N0SS __ 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
Re: [Elecraft] K3 birdies
My K3 with the second receiver does not seem to have these problems either. - Original Message - From: "lstavenhagen" To: Sent: Tuesday, April 20, 2010 10:02 AM Subject: Re: [Elecraft] K3 birdies I can only reproduce the birdie on 80M (and there are actually two very close together, one of which turns on as you tune up the band and then off as you go down. They're at about S2 or 3). But I have very few options installed, the KAT3 and one extra roofing filter and that's it. Maybe these come in with other options like the second RX? Heaven compared to my 706MKIIG which has birdies all over the place, hi hi Mine is K3 #4116. 73, LS W5QD -- View this message in context: http://n2.nabble.com/K3-birdies-tp4927074p4931258.html Sent from the Elecraft mailing list archive at 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: A known bad url was replaced by VIPRE Please help support this email list: A known bad url was replaced by VIPRE __ 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
[Elecraft] External Power Supply for the KPA-500
Hello All, Just a thoughtbut how about a external power supply for the KPA-500 ? It would leave plenty of room for a built In antenna tuner ? 73 de Antnee N3ANT -- View this message in context: http://n2.nabble.com/External-Power-Supply-for-the-KPA-500-tp4931334p4931334.html Sent from the Elecraft mailing list archive at 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
[Elecraft] N2CQ QRP Contest Calendar: April 20 - May 20, 2010
~ N2CQ QRP CONTEST CALENDAR April 20 to May 20, 2010 ~ SP DX RTTY Contest Apr 24, 1200z to Apr 25, 1200z Rules: http://www.pkrvg.org/zbior.html ~ Florida QSO Party (CW/Phone) ...QRP Category Apr 24, 1600z to Apr 25, 0159z and Apr 25, 1200z to 2159z Rules: http://www.floridaqsoparty.org/ ~ Nebraska QSO Party (CW/SSB/Digital) ... QRP Category Apr 24, 1700z to Apr 25, 1700z Rules: http://www.hdxa.net/neqso/index.htm ~ Helvetia Contest (CW/SSB) (Swiss) ...QRP Category Apr 24, 1300z to Apr 25, 1259z Rules: http://www.uska.ch ~ QRP To The Field (CW) ...QRP Contest!! Apr 24, 1500z to Apr 25,0300z Rules: http://www.zianet.com/QRP/ ~ FISTS/EUCW CW QRS Contest (CW) ... QRP Category Apr 26, 0001z to Apr 30, 2359z Rules: http://www.agcw.org/eucw/euqrs.html ~ SKCC Sprint (Straight Key CW) ... QRP Awards Apr 28, z to 0200z Rules: http://www.skccgroup.com/sprint/sks/ ~ AGCW QRP/QRP Party (CW) ... QRP Contest! May 1, 1300z to 1900z Rules: http://www.agcw.org/en/?Contests:QRP-QRP-Party ~ Ten-Ten International Spring Contest (Dig/CW)...QRP Category May 1, 0001z to May 2, 2359z Rules: http://www.ten-ten.org/Forms/QSOPartyRulesRevised.pdf ~ 7th Call Area QSO Party (Ph/CW/Dig) ... QRP Category May 1, 1300z to May 2, 0700z Rules: http://www.codxc.com/new/page.asp?content=dryland7s ~ Indiana QSO Party (All) ... QRP Category May 1, 1600z to May 2, 0400z Rules: http://www.hdxcc.org/inqp/ ~ New England QSO Party (Phone/CW) ... QRP Category May 1, 2000z to May 2, 0500z May 2, 1300z to May 2, 2400z Rules: http://www.neqp.org/ ~ Adventure Radio Spartan Sprint (CW) ... QRP Event! May 4, 0100z to 0300z (First Monday 9 PM EDT) Info: http://adventure-radio.org/wiki/index.php?title=Main_Page ~ AGCW Activity Week (CW) ... QRP Category May 5, z to May 9, 2400z Rules: http://www.agcw.org/en/?Contests:Activity_Week ~ VK/trans-Tasman Contests (80 M Ph) ... QRP Category May 8, 0800z to 1400z Rules: http://home.iprimus.com.au/vktasman/RULES.HTM ~ CQM International DX Contest (CW/SSB) ... QRP Category May 8, 1200z to May 9, 1159z Rules: http://www.cq-m.andys.ru/ ~ FISTS Spring Sprint (CW) ... QRP Category May 8, 1700z to 2100z Rules: http://www.fists.org/sprints.html ~ SKCC Weekend Sprintathon (Straight Key CW) ... QRP Category May 9, z to 2359z Rules: http://www.skccgroup.com/sprint/wes/ ~ CWops Mini-CWT Test (CW) ... QRP Category May 12, 1100z to 1200z and May 12, 1900z to 2000z and May 13, 0300z to 0400z Rules: http://www.cwops.org/onair.html ~ [North American "Minimal Art Session"] MAS "Minimal Art Session" (80M CW) *** QRP Homebrew Only! *** May 13, 9 PM to 1 AM ** LOCAL TIME ** North American Rules: http://tinyurl.com/MAS-QRPedia ~ Dayton Hamvention (QRP Event - FDIM) May 14-16 Info: http://www.hamvention.org/ ~ HIS MAJESTY THE KING OF SPAIN CONTEST (CW) May 15, 1200z to May 16, 1200z Rules: http://www.ure.es/contest/431-sm-el-rey-contest-english-version.html ~ Feld Hell Club Sprint (Feld Hell) ... QRP Category May 15, 1600z to 1800z and 2000z to 2200z Rules: http://sites.google.com/site/feldhellclub/Home ~ RUN FOR THE BACON (CW) *** QRP CONTEST *** EDT: May 16, 9 PM to 11 PM UTC: May 17, 0100z 0300z Rules: http://www.fpqrp.com/ ~ NAQCC Straight Key/Bug Sprint *** QRP CONTEST! *** EDT: May 19, 8:30 PM to 10:30 PM UTC: May 20, 0030z to 0230z Rules: http://home.windstream.net/yoel/contests.html ~ Thanks to SM3CER, WA7BNM, N0AX(ARRL), VA3
Re: [Elecraft] K3 birdies
I can only reproduce the birdie on 80M (and there are actually two very close together, one of which turns on as you tune up the band and then off as you go down. They're at about S2 or 3). But I have very few options installed, the KAT3 and one extra roofing filter and that's it. Maybe these come in with other options like the second RX? Heaven compared to my 706MKIIG which has birdies all over the place, hi hi Mine is K3 #4116. 73, LS W5QD -- View this message in context: http://n2.nabble.com/K3-birdies-tp4927074p4931258.html Sent from the Elecraft mailing list archive at 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
Re: [Elecraft] : Re: News from Visalia! (:-))
Did I read that the two finals in the KPA500 were push-pull? 73, Guy On Tue, Apr 20, 2010 at 2:21 AM, Joe Subich, W4TV wrote: > > >> I'm just stating my opinion that, in the big picture, the >> price point for the KPA500 seems a bit on the high side for >> what you get. Now seeing photos, its certainly better >> looking than my ALS600. And the build quality is probably >> better than my Ameritron product, but for that power level, >> and taking into account the value of my time if I had to >> build it, the cost is a bit high in my opinion. > > Taking this one step further, the KPA-500 may have an updated > design - after all the ALS-600 is a close copy of Granberg's > 20 year old design (Motorola Engineering Bulletin # 104) - but > other than the microprocessor control in the KPA-500, the bill > of materials should be fairly similar for the KPA-500 and > the ALS-600. > > The FETs in the KPA-500 will be slightly more expensive (2 x $87 > in the KPA-500 vs. 4 x $36 in the ALS-600 for Q=1000) but the > differences should be offset at least in part by easier assembly > and calibration. I would expect the KPA-500 to sell for no more > than 20% above the street price of the ALS-600 with linear supply. > Any more than that is difficult to justify ... after all, a watt > is a watt. > > 73, > > ... Joe Subich, W4TV > > > > >> -Original Message- >> From: elecraft-boun...@mailman.qth.net >> [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Luis V. Romero >> Sent: Monday, April 19, 2010 11:51 PM >> To: 'Jim Brown' >> Cc: 'Elecraft' >> Subject: [Elecraft] : Re: News from Visalia! (:-)) >> >> >> I wrote that statement, Jim: >> >> I'm just stating my opinion that, in the big picture, the >> price point for the KPA500 seems a bit on the high side for >> what you get. Now seeing photos, its certainly better >> looking than my ALS600. And the build quality is probably >> better than my Ameritron product, but for that power level, >> and taking into account the value of my time if I had to >> build it, the cost is a bit high in my opinion. >> >> I'm not in this to have a pretty shack to impress my friends >> with lots of lights, gingerbread and ham status symbols. If >> I were into that, I would take out a 2nd mortgage and buy a >> 7800/PW1. :) >> >> Maybe I'm "cheap", maybe not. After all, I do own a rather >> well equipped K3. But with two kids in college and a >> mortgage payment in today's economy, what I have does an >> admirable job. I did have to do "final QC" on my ALS600, and >> I did have to integrate a band decoder to it to switch bands >> from the radio, and I did have to install Phil AD5X's >> marvelous little QSK board, but the K3/ALS600/MFJ998 >> combination I currently operate does exactly what it needs to >> do with little fuss and surprisingly high reliability at a >> very reasonable price point. >> >> While its true that you get what you pay for, as I used to >> say when I was in TV and purchased EFP cameras instead of the >> 5 times more expensive studio versions of the same thing for >> my station. "Nobody at home can see the difference". >> >> It would be nice to have a matching amp and panadapter to go >> with my K3. The Panadapter is well priced for what you get, >> what it is, and for its computer-less feature set, and I will >> probably end up with one of those next year. >> >> The KPA500, in my personal environment, is not. >> >> Again, my opinion, and your mileage will indeed vary. >> Matching boxes are not high on my priority list because, >> well, "You cant hear the difference at home". >> >> -lu-w4lt- >> >> >> Date: Mon, 19 Apr 2010 09:59:58 -0700 >> From: "Jim Brown" >> Subject: Re: [Elecraft] News from Visalia! (:-)) >> To: "Elecraft" >> Message-ID: <2010041917.2a58c58...@gw1.nlenet.net> >> Content-Type: text/plain; charset="us-ascii" >> >> On Sun, 18 Apr 2010 16:16:58 -0400, Terry Posey wrote: >> >> >ALS600 with the Linear Power supply, AD5X Full Break In mod and an >> >external bandswitching accessory plus an MFJ998 would come in >> >considerably under the $2,000 price. >> >> Do I understand that you are equating MFJ with Elecraft? >> That's quite a >> stretch! While I have great respect for W8JI's engineering, >> that does not >> extend to MFJ's manufacturing, and Ameritron has common >> ownership with MFJ. >> :) >> >> I can also buy at least twenty different models of 100 watt >> HF transceiver >> for much less than the cost of a K3. Yet I OWN two K3s. >> >> I just returned from Visalia. The exhibit hall included large booths >> showing Icom and Yaesu rigs. The Elecraft booth was JAMMED >> from the minute >> the doors opened until they closed. The Yaesu and Icom booths >> had only >> modest traffic, and were oftn next to deserted. >> >> 73, >> >> Jim K9YC >> > > > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: ma
Re: [Elecraft] KPA500 active devices!!
"The fcc requires amplifier gain to be 15 decibels maximum for any amatuer radio amplifier. " What a stupid regulation! On the one hand you are allowed 1500W and on the other only 15dB gain? It makes no sense. Presumably one of the CB regulations. A gain of 15 dB is reasonable for a single stage FET amplifier I agree. Does the FCC also forbid operating amplifiers in series? Mike -- View this message in context: http://n2.nabble.com/News-from-Visalia-tp4914396p4930822.html Sent from the [QRO] mailing list archive at 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
[Elecraft] K3 - KPAIO3 'Puller'
Recently, I had to open up my K3 in order to perform a bit of preventive maintenance, on the KPAIO3 PC board. This is the small PC board which interfaces the KPA3 100W amp assembly to the RF board in the Elecraft K3 HF transceiver. The job started off easy enough... remove the top cover, remove the rear cooling fan assembly, remove the KPA3 PC board... I mean, it was an easy thing to do... a small PC board... couldn't be all THAT difficult to pull it straight up and out of the case, right? WRONG! In order to ensure that the KPA3 doesn't accidentally come loose during transport and handling, Elecraft chose to use some REALLY husky dual-row multi-pin 'hi retention' headers to attach the KPAIO3 to the RF board, and the same headers to attach the KPA3 to the KPAIO3. The only difference is that if you must remove the KPA3 from the clutches of the KPAIO3, you have a bit more available 'real estate' to grasp (and pry) on than you do when it comes to removing the KAPIO3 board. In fact, there was a point in time that I was absolutely certain that my KPAIO3 had been soldered directly to the RF board, it was that tightly held in place. Before I went too far and found myself ripping the guts of the RF board out (because my KPAIO3 really WAS soldered to the RF board), I called Elecraft and spoke with one of their techs who was very familiar with the K3. Let me digress just a bit here... I did build my K3 from a kit, but being serial #8 (and one of the first K3's out of Aptos), it had been quite a while since the assembly, and I didn't recall whether I'd installed my KPAIO3 or whether it'd been pre-installed at the factory... so I called to confirm my suspicions... that it really DID plug in. The tech assured me that it did plug into the RF board and he agreed that it was a 'bear' to remove. He suggested 'wiggling' the PC board (front-to-back) as I lifted it up, ever so gradually allowing it to 'work' itself out of the death grip of the two headers. I considered that scenario, but didn't care for the 'wiggling' part, feeling that this only contributed to a possibly fractured PC board joint on one (or more) of the header pins... The tech also suggested using some 'heavy wire' to make a loop to go through two (2) available (and unused) holes in the KPAIO3 PC board, with the loop tied together so I could lift on it and pull the PC board straight out. THIS IDEA I LIKED...! I did a quick search of the shack and found little heavy wire, BUT I did manage to locate what turned out to be a length of 0.125" (1/8") O.D. aluminum welding rod. I checked that the rod just barely passed through the (2) holes in the KPAIO3 PC board and was gratified to find that it did. I then took a few measurements and bent the rod into the lift bracket shown below (note that the two vertical legs are different lengths), cutting off the excess rod length after the final bend had been made. I then used a fine file to smooth out any 'dings' I might have created in the two short 'feet' of the lift bracket, to ensure that they would insert easily into the two PC board holes. Now, all I have to do is to slip the two 'feet' of the lifting bracket into the holes of the KPAIO3 PC board, grip the lifting bracket AND the top bar of the K3 rear panel and squeeze my hand! The PC board pops out cleanly and quite easily. And much more safely than were I to have to 'wiggle' things back 'n forth. While I don't expect everyone to have 1/8" O.D. aluminum welding rod on hand, I'm pretty certain that the same device could be made using a fairly heavy gauge metal clothes hangar. The IMPORTANT thing is, when using this device, keep the main body of the lifting bracket up flush against the PC board, thereby reducing the stress on the feet and keeping them from bending. A PDF with this article and dimensional illustrations of the KPAIO3 Puller is available on my web site at: http://www.n0ss.net/index_k3.html more specifically: http://www.n0ss.net/kpaio3_pcb_puller_v1r1.pdf 73, Tom Hammond N0SS __ 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
Re: [Elecraft] Grounding negative side of power supply?
I'm not so sure we aren't getting carried away with our own interpretation of NEC rules here. We also have to apply a little technical "common sense" to our systems. I have antennas and towers scatter over thousands of feet distance. It would be totally worthless and physically impossible to bond the ground rods on my antennas to my mains ground. The additional protection to my house and equipment, and to people, would be zero. In addition to no improvement in protection, the effectiveness of the low-noise antennas would be greatly decreased. Then we have to consider odds that power lines, trees, and our large towers would be ignored by lightning and a small ten-foot-tall twenty-foot-long, antenna would be struck. If it were struck, where would the majority charges move? In the feeder to the house. If the feeder ground were bonded to the mains ground at the building entrance, the safety issue for people and the dwelling is closed at that point. The ground at the dwelling entrance, that is mandated by NEC to be bonded to the mains ground, is key to safety. Not the critical signal ground at some backyard clothesline antenna. I also frequently hear that "insurance disallowed" statement. If insurance was "disallowed" for a NEC safety or rule violation, very few claims would ever be paid. In my entire life I can't recall having a claim denied because of something like this. I would bet well over half of Ham stations lack a proper entrance or station ground bonded to the mains ground, but I don't recall ever knowing of a claim disallowed for that gross error. 73 Tom __ 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
Re: [Elecraft] KPA500` (flux leakage)
Some years ago I received a complaint from W4ZV about spurious signals offset about 1 kHz or so on my Icom 751A. There was no amplitude modulation of the carrier visible on scope, yet Bill could easily hear the spurs. It turned out the toroidal transformer in the 751A internal power supply had enough flux leakage to change the reactance of the VCO coils that were about 3 inches from the toroid. The rig was being FM modulated. I rotated the power supply 90 or 180 degrees and the problem went away. At radio frequencies using a red "-2" mix, there can be almost 30% change in inductance from spreading or bunching turns in a coil. This is from core flux leakage. I've had low pass filters put ripples in an adjacent filter when the toroids get too close. These cores are largely touted as "self-shielding" in our handbooks. I'd be very careful accepting broad general statements without looking at the specific case in question. 73 Tom __ 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
Re: [Elecraft] P3 color selection (was Re: time to order your P3, design details?)
On Mon, 2010-04-19 at 20:56 -0700, Kok Chen wrote: > This web page is intended for web designers, but is useful for designing any > color based user interface: > > http://www.iamcal.com/toys/colors/ Here's another one that does it a different way. (Click on "Vision Simulation" near the upper right corner.) http://colorschemedesigner.com/ Alan N1AL __ 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
