Re: [Elecraft] Boost power supplies for RF amps

On 2/20/17 at 5:35 PM, jackbrin...@me.com (Jack Brindle) wrote: To be fair, we have had one instance of the problem, and that station was running the battery critically low. In fact the battery failed at that voltage (something like 10 volts) and had to be permanently removed from service. Per

Re: [Elecraft] Boost power supplies for RF amps

On 2/20/2017 3:11 PM, Matthew Cook wrote: > I believe we will see a return of the 50V MOSFET PA's in commercial > equipment again, especially with the explosion of LDMOS devices and the > ever decreasing availability of 16-18V bi-polar RF transistors. Modern commercial communication sites have al

Re: [Elecraft] (OT) CW Resonant Speaker

Knowing very little about the physics of sound, does using a thinner tube as opposed to a larger diameter one, make the tube have a narrower " bandwidth " ? See: http://www.fonema.se/qpipe/qpipe.htm Since the primary loss component of an "organ pipe" is friction along the wall, a larger diame

Re: [Elecraft] (OT) CW Resonant Speaker

This whole topic is very interesting to me. Very ironically, just before this topic got started, I was thinking about qrp hall of famer, Rick Littlefield's, Ham Radio magazine article Mar 89', featuring a resonant cw speaker. It was built using a solo 16 cup and a small 700hz transducer. I put it

Re: [Elecraft] Boost power supplies for RF amps

At my home station I run my transmitters on a "boosted" 14+ V bus using a TG Electronics Boost Regulator - and "the knobs" at about "3 o'clock". The station battery can go as low as 11.5 V but the 14V bus stays there. On 2/20/2017 3:56 PM, Ron D'Eau Claire wrote: > For the rigs running off of 12

Re: [Elecraft] [KX3] Re: Psk 31

My favorite CW frequency. You'll find little/no digital activity on 7035. Look around 7070. On Feb 20, 2017 18:47, "wrjohnso...@hotmail.com [KX3]" < kx3-nore...@yahoogroups.com> wrote: Isn't 7.035 smack in the middle of the cw operating band? Have a great day! Bill K9YEQ On Mon, Feb 20, 2

Re: [Elecraft] Boost power supplies for RF amps

Bill; To be fair, we have had one instance of the problem, and that station was running the battery critically low. In fact the battery failed at that voltage (something like 10 volts) and had to be permanently removed from service. Perhaps the answer is to take the battery manufacturer’s advic

Re: [Elecraft] Boost power supplies for RF amps

I'm trying to reconcile this advice with our experience running QRP field day. We frequently have two or 3 K3s on a single band (CW, SSB, Digital/GOTA). We use batteries and solar cells since our site does not permit generators. When the radios are being fed from a charged battery or a battery

Re: [Elecraft] Boost power supplies for RF amps

And there is little difference in signal strength, might actually be stronger as copy is better and less signal wasted by eliminating IMD, etc. 73, Bill K9YEQ -Original Message- From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Ron D'Eau Claire Sent: Monday, February

Re: [Elecraft] Boost power supplies for RF amps

For the rigs running off of 12 (13.8) Vdc, how about simply not running the rig "all knobs full right"? Reducing the power by 25% will improve IMD performance at lower voltages, yet that power difference is virtually impossible to detect on the H.F. bands. 73, Ron AC7AC ___

Re: [Elecraft] Boost power supplies for RF amps

I have a Codan 6924 lunch box radio that does just this. ( http://www.hfradiosales.com.au/codan_%20barrett_hf_radio_information/RADIOS/files/6924%20MK2-2.jpg ) It takes in 10-15V and boosts it to 28V to feed a 25W PA, it does so only on TX. This radio was designed in 1969 and released to market

Re: [Elecraft] Boost power supplies for RF amps

I believe the new Anan-8000DLE does exactly this, and steps up the voltage to 50V. No idea if there's any noise related to these boost converters. Seems like a neat idea, just not sure how it will work in practice. On Mon, Feb 20, 2017 at 4:08 PM, Bill Frantz wrote: > The short answer is they ca

Re: [Elecraft] second receive antenna port of K3

Will, You are interpreting the manual correct. The ANT1/2 choice can be made independently of whether the KAT3A is in BYPASS or TUNE. 73, Don W3FPR On 2/20/2017 5:36 PM, WILLIE BABER wrote: I need access to both ports without the tuner, i.e., the tuner is bypassed on either port. I think

Re: [Elecraft] Boost power supplies for RF amps

I have long wondered why some manufacture did not think of it.  That is a amp with built in 12 VDC boost PS.  With all of the new switching tech, it should be a KISS solution and make the amp SOUND GREAT all of the time Just my opinion hi. Mel, K6KBE From: Bill Frantz To: elecraft@ma

[Elecraft] second receive antenna port of K3

Now that I am totally doing so2r K3, I have reasons to use the second antenna port available for k3/K3s. I understand from the K3s manual that the second port works off the internal tuner module. If I understand correctly, you can bypass the tuner and then select either of the two antenna port

[Elecraft] Boost power supplies for RF amps

The short answer is they can. It is only a matter of engineering time, cost, resulting price, number of customers and competing projects. In other words, the usual business considerations. Lets work the idea through for several of the Elecraft RF amplifiers: The 10-15W K3(s) amp: This amp can

Re: [Elecraft] KX2 Happiness

I have found the Microsoft auto-correct system to be far less literate than the majority of folks writing text. It is quite frustrating to have to add a half dozen words to its lexicon while I am writing a simple email. Said lexicon includes a few errors which need to be corrected. My high s

[Elecraft] K3 sidetone puzzling malfunction

After years of using the same* station configuration, for the last couple weeks I have a weird thing that I haven't been able to explain or isolate a cause for. Using one of my headsets, the sidetone decreases in volume by at least about 10 dB during a transmission. Usually it happens quickly but

Re: [Elecraft] [kx2] temperature compensation procedure for kx2 ?

No and no. 73, Lyle KK7P On 2/20/17 10:19 AM, kevino z wrote: Is there the ability or even need to perform the temp compensation / calibration procedure in the kx2... __ Elecraft mailing list Home: http://mailman.qth.net/mailman/li

[Elecraft] MixW and K3...

Hi, Is anyone using a K3 with MixW? If so, I have a few questions for you... Please contact off list. -- 73s and thanks, Dave NK7Z http://www.nk7z.net __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Hel

[Elecraft] K2 internal battery

I was asked several times on private messages for this information. Note: I am not affiliated with the supplier in any way. The discussion was for a custom replacement for the 2.9 Ampere-hour gel cell used in the Elecraft KBT2. The replacement suggested by me is a rechargeable 4.5 Ampere-hour Li

[Elecraft] K3 Shipping Box

Back in 2013, I purchased a custom shipping box from Dave Haller, KA1W, of www.hamradioboxes.com with which to ship an Acom 1000 amplifier that I was selling. It was pricy, but so was the amp. I would not have purchased one for just a half a K3 round trip to Elecraft Service, but if you are d

[Elecraft] K3/100 gets hotter running remote (terminal mode) vs. 100W out

Can't you set the fan to be on continuously? John KK9A Barry w2up said: Mon Feb 20 08:00:19 EST 2017 I operated my K3/100 remotely this weekend in ARRL DX. I noticed the top of the case getting pretty warm - not too hot to touch, but warm enough I wouldn't want to keep my hand on it. The fan n

[Elecraft] FS: K8RA P2jr QRP Paddle

I'm selling my last iambic paddle, it's a somewhat rare K8RA P2jr that I used qrp/camping (serial number 12) miniature iambic paddle. it is made to the same high quality standards all of Jerry's were, solid brass and ball bearing pivots. The base is 2"x2 1/2" and weighs just over 1 lb. Requires a s

Re: [Elecraft] Quick Way To Accurately Measure K3s CW Filter Offset?

Also make sure your sidetone pitch setting is where you like it. Eric /elecraft.com/ On 2/18/2017 9:00 AM, Nr4c wrote: The 409 is zero. Are the passband centered on display? Sent from my iPhone ...nr4c. bill On Feb 18, 2017, at 3:30 AM, Dave AD6A wrote: Hi Folks, I'm having a go at my

[Elecraft] [kx2] temperature compensation procedure for kx2 ?

Is there the ability or even need to perform the temp compensation / calibration procedure in the kx2 like I did on my KX3? Thanks -Kevin (KK4YEL) - The problem with the world is that the intelligent people are full of doubts, while the stupid ones are full of confidence. __

Re: [Elecraft] Chinese ebay amps for KX3

The way the wire is wound through the tubes in the photo reminds me of the 100W PA section in the Heathkit HW/SB-104 transceiver. Dick, n0ce On 2/20/2017 5:03 AM, Hajo Dezelski wrote: > Hello, > > I use this one: > http://pa-11019.blogspot.de/2016/11/diy-kits-70w-ssb-linear-hf-power.html > and

[Elecraft] Follow-up... Considering KPA500/KAT500 Combo with Flex 6500

I put the new KPA/KAT500 to work with my Flex 6500 this weekend in the ARRL-DX-CW contest and I had an absolute blast! It was generally a casual effort but netted 500 contacts, about 90ish being unique DX and qualified for CW DXCC. I worked 80,40,20,15 (surprisingly productive on 15) and ran the KP

[Elecraft] K2 internal battery

Harry I use the Batteryspace charger recommended for that pack and simply plug it into the radio. I had to select the model with the right plug to match the rig. I flip the battery switch on the K2 'on' for charging. The charger shuts itself off when done. No radio alterations or anything else a

[Elecraft] Elecraft K1-4 for sale

Hi- I have an excellent K1-4 for sale. It covers 40, 30, 20, 15 Meters. Has the built in automatic antenna tuner and noise blanker. Also comes with the original K1-2 band board that covers 40 and 20 with power cord. No scratches, non smoker, used only in shack. $415 shipped CONUS. In NH __

Re: [Elecraft] Need source for 8-pin mic panel jack as on K3

Many thanks to all who replied! It seems as if there are many sources. Based on the recommendation of Joe Subich, W4TV, I just ordered from Buxcom (www.packetradio.com), which had both cable and panel types, as well as some other things I was looking for. Regards, Joel Hallas, W1ZR Westport, CT

Re: [Elecraft] Chinese ebay amps for KX3

Does it work well with all modes? CW/SSB/Digital? 73 Len -Original Message- Subject: Re: [Elecraft] Chinese ebay amps for KX3 Hello, I use this one: http://pa-11019.blogspot.de/2016/11/diy-kits-70w-ssb-linear-hf-power.html and it works without any problem. 73 de Hajo dl1sdz --- Ce

Re: [Elecraft] OT: Need source for 8-pin mic panel jack as on K3

Hello Joel! Try http://www.americanradiosupply.com/8-pin-ham-cb-radio-microphone-connector-panel-jack/ I haven't tried this particular source, but I suspect it will work for you. 73, Lyle KK7P On 2/20/17 8:29 AM, Joel Hallas wrote: Dear List, I need to find a source for the type of 8-pin

[Elecraft] Audio File Transfer to K3S

I recall reading something about transferring optimized audio files to the K3S, but I can't locate it. I would like to prepare contest exchanges in a desktop software package and move them to the Elecraft digital voice keyer in the K3S. I would like to tranfer these files using the standard K

[Elecraft] 8 pin mic

-- May You Live Long and Prosper what's life without a few dragons __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: m

Re: [Elecraft] K2 internal battery

I read the thread and I did not find how you are charging the battery. How do you charge it? Thank you From: inventor61 . To: hlyin...@yahoo.com; elecraft@mailman.qth.net Sent: Saturday, February 18, 2017 7:54 PM Subject: K2 internal battery Harry Having done the change myself a

Re: [Elecraft] OT: Need source for 8-pin mic panel jack as on K3

Joel, Try p/n #2399 at Universal Radio. 73, Don W3FPR On 2/20/2017 10:29 AM, Joel Hallas wrote: Dear List, I need to find a source for the type of 8-pin (male) panel jack, as used on the K3 and many other ham transceivers. This is for a project to allow connection of my Elecraft wired mic. Ra

Re: [Elecraft] Chinese ebay amps for KX3

I have gotten the MX-P50M up and running with my KX3 keying it OK. I was able to get over 50 watts out of the amp into a dummy load with 6 watts from my KX-3 on 160 meters. It turns out to be quite simple to configure once I researched how the amp lead was used for keying with the FT-817 and what

[Elecraft] OT: Need source for 8-pin mic panel jack as on K3

Dear List, I need to find a source for the type of 8-pin (male) panel jack, as used on the K3 and many other ham transceivers. This is for a project to allow connection of my Elecraft wired mic. Radio Shack used to sell these, but now seems to just have the cable side. If anyone has a mfr name and

Re: [Elecraft] Chinese ebay amps for KX3

It's not a matter of can't. Why as a customer should I pay for the added power supply when I'm installing my rig mobile? Or how about if already have a nice power supply. Do you want to increase the cost of the radio which will result in a higher weight and cost for customers that don't want the f

Re: [Elecraft] Chinese ebay amps for KX3

Very nice amp Hajo So now, tell me why a mid-sized radio can't have a built in 12 V to say, 50 V converter to drive some HV FETs for cleaner output specs like the Yuge radios. 73, Charlie k3ICH -Original Message- From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Haj

Re: [Elecraft] speaker and phones levels

Thanks all for the answers I external speaker will be the solution I use LINE OUT for other purpose so I need to use spkr jack thanks for the QSOs in ARRLDX CW 73, Jorge CX6VM/CW5W 2017-02-19 20:32 GMT-03:00 Don Wilhelm : > Jorge, > > One method I can think of is to use an external speaker wi

[Elecraft] K3/100 gets hotter running remote (terminal mode) vs. 100W out

I operated my K3/100 remotely this weekend in ARRL DX. I noticed the top of the case getting pretty warm - not too hot to touch, but warm enough I wouldn't want to keep my hand on it. The fan never came on. Is this normal? If so, perhaps firmware should be updated to sporadically run the fan an

Re: [Elecraft] KX2 Happiness

I refer to it as "auto-corrupt." Jeff - KG7HDZ > On Feb 19, 2017, at 9:29 PM, Wayne Burdick wrote: > > Damn auto-correct :) > > Wayne > > > On Feb 19, 2017, at 6:01 PM, Mike Morrow wrote: > >>> But I don't think the Maldol HF whips are available anyway, >>> so it's a mute point. >> >> And

Re: [Elecraft] Chinese ebay amps for KX3

Hello, I use this one: http://pa-11019.blogspot.de/2016/11/diy-kits-70w-ssb-linear-hf-power.html and it works without any problem. 73 de Hajo dl1sdz --- Cela est bien dit, mais il faut cultiver notre jardin. http://hajos-kontrapunkte.blogspot.de/ Am 20.02.2017 3:46 vorm. schrieb "Richard L