Re: [Elecraft] Why predistortion ?

On 9/14/2020 5:21 PM, JR wrote: Parenthetically, K9YC created that particular document specifically in response to my request on another reflector for quantification relative to unsubstantiated claims contradicting what ARRL Lab guru Bob Alison, WB1GCM, told me. That piece I compiled came

Re: [Elecraft] Overlapping K2 upgrades?

I have ALL the upgrades as far as I know, but for my original Field Test K2 SN 00057 I stopped at CW only. I have (I think) ALL the upgrades/updates and SSB and the 100W kit. I guess that all I can do is go through ALL of it and try to make sense/sure everything is in order. (???) Ed N4XY On

Re: [Elecraft] Overlapping K2 upgrades?

Doug, If you have the most current upgrade kits, there is no overlap. OTOH if you have older upgrade kits such as the BFO upgrade, there were changes. 73, Don W3FPR On 9/14/2020 7:49 PM, Douglas Hagerman via Elecraft wrote: I am starting to apply the accumulated Elecraft upgrades to an

Re: [Elecraft] [K2] Interest in assembled K2?

They sell on here all the time. I generally miss the ones that go for a good price. 73 de Joe NE3R On Mon, Sep 14, 2020 at 8:04 PM K1FFX wrote: > I'm starting to plan how to get through the cold months that are coming > during which we won't be getting together with friends and family at all,

[Elecraft] Why predistortion ?

Mr. Wayne said --  "On the other hand, our transceivers are best in class in terms of transmitted keying bandwidth.  See paper by K9YC for example.  Perhaps that's what JR was thinking of." YES,  that is EXACTLY what I was

[Elecraft] [K2] Interest in assembled K2?

I'm starting to plan how to get through the cold months that are coming during which we won't be getting together with friends and family at all, since it will be too cold to do so outdoors. I've been a happy K2 owner for 10 years now, having built my K2 back in the Summer/Fall of 2010. I'm now

[Elecraft] Overlapping K2 upgrades?

I am starting to apply the accumulated Elecraft upgrades to an early K2. Do any of them overlap? Is there a preferred sequence I should follow? Doug, W0UHU. __ Elecraft mailing list Home:

Re: [Elecraft] K3: KIO3 dgital board failed (I think)

I had exactly that same problem, Ed, and I also first thought it was the USB/RS232 cable (which it wasn't).  I also do not need the direct USB connectivity, or the associated internal sound card. Luckily, I was able to buy replacement boards from someone who had done the upgrade to the KIO3B

Re: [Elecraft] K3: KIO3 dgital board failed (I think)

Oh yes. And the only way out is to upgrade the whole system. Or look for used items here. Sent from my iPhone ...nr4c. bill > On Sep 14, 2020, at 4:48 PM, Edward R Cole wrote: > > My K3 SN 4340 bought in 2010 apparently has a failure in the RS232 I/F. > > My computer says the FDTI cable

[Elecraft] Continuing saga with Tx Inhibit and the KX3 - possible firmware bug?

Having solved the need for getting +Ve Tx Inhibit working on my KX3/10GHz Transverter integration using a mosfet switch to invert the signal and configured the KX3 for 0v Tx Inhibit, I had opportunity to test it out this afternoon. The solution seemed to work fine on SSB but I now have a weird

Re: [Elecraft] Why predistortion ?

I ordered my K3 in 2008. The K3s was a modest upgrade. The processing power to accomplish predistortion has only become affordable in the last few years and is far beyond the capacity remaining in the 12 year old K3. Jim abt On Sep 14, 2020, at 4:44 PM, IK4EWX wrote: Why it seem so

Re: [Elecraft] Why predistortion ?

Pre-distortion is often used in modern cellular base-station transmiters, and perhaps digital broadcast systems where they have to handle multiple carriers simultaneously, "at power". It dramatically reduces transmitted intermodulation to very low levels, allowing such multi carrier systems

[Elecraft] K3: KIO3 dgital board failed (I think)

My K3 SN 4340 bought in 2010 apparently has a failure in the RS232 I/F. My computer says the FDTI cable is working and using com port-6 but there is no connection using the K3 Utility or WSJT-X which was running fine in July. The radio no longer keys up on computer boot-up as before. I

Re: [Elecraft] Elecraft Digest, Vol 197, Issue 18

For goodness sake, please trim your posts!!! ;-( 73, Alan. G4GNX -- Original Message -- From: ccolema...@gmail.com To: elecraft@mailman.qth.net Sent: 14/09/2020 21:10:47 Subject: Re: [Elecraft] Elecraft Digest, Vol 197, Issue 18 Sent from my iPhone On Sep 14, 2020, at 11:03 AM,

Re: [Elecraft] Why predistortion ?

Why it seem so difficult thing for the great Elecraft rigs? Apache Labs Anan rigs, from 2.700 to 4.400 $, all have predistortion included. Are their power supply with higher voltages than the 12V of Elecraft? Ian Ik4EWX -- Sent from: http://elecraft.365791.n2.nabble.com/

Re: [Elecraft] Elecraft Digest, Vol 197, Issue 18

Sent from my iPhone > On Sep 14, 2020, at 11:03 AM, elecraft-requ...@mailman.qth.net wrote: > > Send Elecraft mailing list submissions to >elecraft@mailman.qth.net > > To subscribe or unsubscribe via the World Wide Web, visit >http://mailman.qth.net/mailman/listinfo/elecraft > or,

Re: [Elecraft] K4 Second RX and VHF

Amen.  RIP On 9/14/2020 11:22 AM, Randy Farmer wrote: The demise of TMP connectors? Hooray! 73... Randy, W8FN On 9/14/2020 1:00 PM, Wayne Burdick wrote: The cabling requirements are simple (coax_*with very sturdy MCX plugs*_): one to bring RF into the receiver module, and another to get the

Re: [Elecraft] 630 meter operation on the K4

By the way, the K4 provides a way to do direct comparative sensitivity measurements for both receivers. A persistent display in relative dB can be shown. This makes things like MDS testing very easy. 73, Wayne N6KR > On Sep 14, 2020, at 11:14 AM, Jim Miller wrote: > > Nice!! > > Thanks for

Re: [Elecraft] K4 Second RX and Transverters

> On Sep 14, 2020, at 10:21 AM, Jeff Uchitjil wrote: > > I have sent this question to Elecraft support a few times over the last few > weeks without a response, so I am giving it a try here. > > If I have a basic K4 and a 2M transverter attached, will I be able to monitor > 6M or any other

Re: [Elecraft] K4 Second RX and VHF

The demise of TMP connectors? Hooray! 73... Randy, W8FN On 9/14/2020 1:00 PM, Wayne Burdick wrote: The cabling requirements are simple (coax_*with very sturdy MCX plugs*_): one to bring RF into the receiver module, and another to get the filtered receiver output signal to the digital

Re: [Elecraft] 630 meter operation on the K4

Nice!! Thanks for the update! jim ab3cv On Mon, Sep 14, 2020 at 2:11 PM Wayne Burdick wrote: > You can directly set the frequency to this range. There's no need for a > transverter band. > > Test mode will not be needed. > > For receive purposes, you can use any of the five antenna jacks. I

Re: [Elecraft] 630 meter operation on the K4

You can directly set the frequency to this range. There's no need for a transverter band. Test mode will not be needed. For receive purposes, you can use any of the five antenna jacks. I just measured the MDS at -135 dBm, which is more than satisfactory on on this band. For transmit you'll

Re: [Elecraft] 630 meter operation on the K4

And will the K4 need to be in "Test" mode as the K3 was required? jim ab3cv On Mon, Sep 14, 2020 at 1:25 PM Jim Miller wrote: > Will the band be evident or will it need to be added? Will there be an > appropriate XV offset to allow direct reading of the frequency? > > Thanks! > > jim ab3cv >

Re: [Elecraft] 630 meter operation on the K4

Will the band be evident or will it need to be added? Will there be an appropriate XV offset to allow direct reading of the frequency? Thanks! jim ab3cv On Mon, Sep 14, 2020 at 12:35 PM Wayne Burdick wrote: > The K4 has receive capability in this band, and will transmit at the XV > OUT jack

[Elecraft] K4 Second RX and Transverters

I have sent this question to Elecraft support a few times over the last few weeks without a response, so I am giving it a try here. If I have a basic K4 and a 2M transverter attached, will I be able to monitor 6M or any other internal band off of the single main antenna port and also have a 2M

Re: [Elecraft] Why predistortion ?

I don't think anyone said it can't be done or hasn't been done before. It has. But you can't ignore the cost, reliability/ complexity, efficiency (power and signal) of the changes. For those of us that have actually had to design and implement circuit changes like this at the commercial level,

Re: [Elecraft] K4 Second RX and VHF

The KRX4 option (which turns a K4 into a K4D) comes with two modules: a plug-in digital downconverter board, and a plug-in receiver board. One of them lives in the digital compartment and the other in the RF compartment, which are already shielded from each other, so no additional shielding is

[Elecraft] K4 Second RX and VHF

I keep trying to find a picture for months of the inside of the K4 but I can not find one so I give up and will ask?  How is the second RX handled mechanically.  I just hate the box in the K3S for the second RX.  What a pain as you have to take it out to do things with the filters and all the

Re: [Elecraft] 630 meter operation on the K4

The K4 has receive capability in this band, and will transmit at the XV OUT jack well in excess of 0 dBm. (More like +7.) This should be suitable for use with an external amplifier. Wayne N6KR > On Sep 14, 2020, at 8:10 AM, Nigel Lemaire wrote: > > Wondering what capabilities the K4 will

Re: [Elecraft] Why predistortion ?

DC to DC is used in video and RF frequency, over 50 years I know of,all the time to get away from 60hz and other design nonlinearities. Retired NIST DC to 18GHz lab tech AB7CE Roy -Original Message- From: Dr. William J. Schmidt Sent: Monday, September 14, 2020 10:05 AM To:

[Elecraft] Why predistortion?

*The Elecraft K-Line already produces some of the cleanest, puresttransmit signals around.* Au contraire! I'm in a morning roundtable where four use K3Ss --- all four have an unacceptable (only 32 dB down) popup on the opposite sideband on certain peaks. It has always puzzled me why Elecraft, so

Re: [Elecraft] 630 meter operation on the K4

Looking at the published specs… Frequency Range: 100 kHz - 54 MHz (VHF/UHF range to be determined*) https://elecraft.com/products/k4-transceiver wunder K6WRU Walter Underwood CM87wj http://observer.wunderwood.org/ (my blog) > On Sep 14, 2020, at

Re: [Elecraft] Why predistortion ?

On 2020-09-14 7:29 AM, Charlie T wrote: > However, implementing the pre-distortion function IS probably a better long-term solution. Pre-distortion on a 12V rig only hides the problem. Any "home station" rig should have 28/50 V finals *and* then one can make it even cleaner with

Re: [Elecraft] Why predistortion ?

Always tradeoffs to be made. Boosting 12V volts to 50V means some sort of converter that can add its own distortion products, plus expense and additional complexity (read that "reliability") and efficiency. There's no free lunch here. Dr. William J. Schmidt - K9HZ J68HZ email: 

Re: [Elecraft] Why predistortion ?

6AU6 - 6CL6 - 6146A trio is a very and associated circuitry produces some of the lowest distortion products when run at the right conditions (voltages, etc). Note at 75 watts the 6146 is in its sweet spot. Dr. William J. Schmidt - K9HZ email:  b...@wjschmidt.com -Original Message-

Re: [Elecraft] Why predistortion ?

Maybe I'm missing something here, but it would seem to me that if an FET linear amplifier running from 50 V or higher is considerably cleaner than one running from 12 V, that, for a high end rig, a simple step-up switching supply could solve the problem. But, that obviously adds to the cost

Re: [Elecraft] Why predistortion ?

According to Rob Sherwood, the Collins 32S-3 produces the cleanest SSB signal on the air of any commercial amateur radio transmitters. 73, Charlie k3ICH -Original Message- From: elecraft-boun...@mailman.qth.net On Behalf Of David Gilbert Sent: Sunday, September 13, 2020 9:51 PM To:

[Elecraft] 630 meter operation on the K4

Wondering what capabilities the K4 will have on this (these) bands... 73 Nigel Wa6MSE __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post:

Re: [Elecraft] KAT500: Fails to tune, and shows 3:1 on good antenna on 18 MHz.

GL! Ken WA2LBI On Mon, Sep 14, 2020 at 7:53 AM Dave Cole wrote: > Hi ken, > Added the dummy, no problems, so it is the antenna... Also, given it is > a 6BTV with the 18 meter add on, and all other bands work, it is not the > feedline... > > This makes it simple to fix! It is either a

Re: [Elecraft] KAT500: Fails to tune, and shows 3:1 on good antenna on 18 MHz.

Hi ken, Added the dummy, no problems, so it is the antenna... Also, given it is a 6BTV with the 18 meter add on, and all other bands work, it is not the feedline... This makes it simple to fix! It is either a break with the laws of physics as we understand them today-- or a connection has