Date   

K3 value?

Bill Maddock
 

I have a friend with a base K3-100
with antenna tuner, wanting to sell his radio. No upgrades hardly used. What would be fair asking price? Serial number 4000 +

Thanks and 73,

Bill WW5M Munford, Tn


Transmitting 5 watts on my K3

Kevin Wagner
 

I've noticed when I have my power set to below 5 watts and hit the XMIT button the transmitted signal only happens for 3 seconds. If I raise the power above 5 watts the transmitted signal is constant. Is this normal and why does it happen below 5 watts?

73,
Kevin
W2FA


Re: Sub RX Failure or some config change I haven't figured out yet?

southdaleus
 

I rember something to that.  I believe it has to do with the connection reversed and to change it need to press one or two while in the speaker menu.

Dale k9vuj


On 24, Feb 2019, at 9:25, Mike Flowers <mike.flowers@...> wrote:

There is a configuration parameter that affects the SUB in this way.  I will see what I can find in a scan of the PDF manual. 

-- Mike Flowers, K6MKF, NCDXC - "It's about DX!"

On Feb 24, 2019, at 5:59 AM, John K3TN via Groups.Io <jpescatore@...> wrote:

No, I'm getting audio to both ears from VFO A but not from sub RX/VFO B. 

Someone else suggested CONFG SPKRS 2, have that set too.

73 John K3TN


Re: Sub RX Failure or some config change I haven't figured out yet?

Mike Flowers
 

There is a configuration parameter that affects the SUB in this way.  I will see what I can find in a scan of the PDF manual. 

-- Mike Flowers, K6MKF, NCDXC - "It's about DX!"

On Feb 24, 2019, at 5:59 AM, John K3TN via Groups.Io <jpescatore@...> wrote:

No, I'm getting audio to both ears from VFO A but not from sub RX/VFO B. 

Someone else suggested CONFG SPKRS 2, have that set too.

73 John K3TN


Re: Sub RX Failure or some config change I haven't figured out yet?

John K3TN
 

No, I'm getting audio to both ears from VFO A but not from sub RX/VFO B. 

Someone else suggested CONFG SPKRS 2, have that set too.

73 John K3TN


Re: Sub RX Failure or some config change I haven't figured out yet?

ke9uw
 

I've had the speaker plug get a little wonky at times. Just reinserting it brought the audio back. Any chance of that?


Sub RX Failure or some config change I haven't figured out yet?

John K3TN
 

The Sub RX audio has disappeared on my K3S on all bands.  Had been working fine, just disappeared. Both main and sub RX share the same antenna.

I hold RXANT down to make sure MAIN is selected. CONFIG KRX3 shows Ant=Atu. CONFIG L-MIX-R shows A b. CONFIG SPKRS 1. SUB AF is BALANCE but no audio when turn sub AF gain clockwise.

Any other possible configuration gremlin to check before contacting Elecraft support?

73 John K3TN


New release of Win4K3SUite

Tom Blahovici
 

Hello,
There is a new release of Win4K3Suite.  Version 1.948 includes a number of enhancements to the Spectrum scopes pertaining to peak detection resulting in continuous display down sampling instead of the discrete steps in the past.  This new release will also display the SWR after the first transmit. (Note this is not currently available for SSB modes).
You can see the complete list of changes here: https://va2fsq.com/documentation/
Win4K3Suite is a comprehensive control program for the K3/S, KX3, and KX2 supporting the KPA500, KPA1500 and KAT500.  It has 6 built in virtual radios allowing trouble free port sharing as well as as a built in HRD Logbook server.
You can see more here: va2fsq.com and here: https://www.youtube.com/results?search_query=win4k3suite
 
73 Tom
va2fsq.com


Re: KPA1500 PS produces RF noise via mains cable

Mark W2OR
 

Hi, Wolf,

   1.  I wish you well with the troubleshooting efforts.  Please do keep us posted.  You're getting lots of great advice here.  This is a very interesting 'bug', since you are not getting noise in the K3 Rx when using the KPA500, but you are getting noise in the K3 Rx when using the new KPA1500.  

   2.  I see from early posts that you have over 12 ideas to check and test. Based on my own experience with the K-Line and KPA1500 and KPA500 here, I want to underline the ideas you already have from Bob, N6TV, and from Rick, N6XI.  

   3.  Cables and Chokes:  If you do isolate the P3, which I also recommend, do disconnect all cables from the P3 and K3.  Yes, I also use, and I also recommend, many chokes on all connections to the P3, and K3, and amp, including the 12v line to the P3, and the AC lines.

   4.  Check all your ground connections between equipment and the station ground.  If your station ground connection is a long length of wire from the rigs to ground, let us know the approximate length of that main ground wire.  Are you using an earth ground?

   5.  Are you using the same 240v AC wall outlet for the plug of the KPA-1500 power supply, to also power the other equipment; or, are you using a separate 240v line for the KPA-1500?

    6.  Also, with the KPA500, are you using the same 240v C supply outlet that you use with the KPA-1500? 

   7.  When you follow the earlier advice from another posting, to first disconnect all equipment, and then begin to re-connect equipment one at a time, please do ensure that this includes your computer and computer screens and cables to the K3.

   8.  Yes, do write Elecraft a long email.  Include in your email some answers to the questions that we have all asked.  You will be very pleased with their reply.  In your note to Elecraft, do mention this web site reflector, so they can also read what has been written by all those who have sent in their very good ideas to you.   It will help Elecraft techs when they read that.  Also, Wolf, your English is terrific!!  Congratulations !!  

      Best of luck,   //  Mark  W2OR


Re: KPA1500 PS produces RF noise via mains cable

Wolf E. Rose
 

HI Bob,

and many thanks for your detailed answer and the numerous useful hints on making the P3 immune against unwanted spurs. 

Unfortunately the RF noise is not only to be seen on the P3’s screen but also rising it’s ugly head in my K3 as well. The noise level rises likewise in K3 (audible and to be seen from the S-meter) and on P3’s screen.

BUT your email brought an idea to my mind: I just checked the system by using a dummy load instead the antenna hooked to KPA1500’s  ANT1 output with KPA’s RF deck switched ON.
Result: no increase of noise neither into K3 nor P3. From that it is apparent, that the noise is injected into my houses ac wiring via the KPA’s PS AC cable and from there radiated into my antennas (which are very near located to my house.

I just made the following measurements on a now (20:00 local time = 19:00 UTC) closed 20m band with my beam connected to the antenna port: 
1: KPA RF deck OFF (KPA PS on via rear switch) K3 S-meter: S3; P3 -110dBm @ 100kHz bandwidth
2: KPA RF deck ON via front push button: K3 S-meter S4 to S5; P3 -104dBm @ 100kHz bandwidth
As I already wrote earlier, the noise is very strong from 80m up to 20m, decreasing gradually up to 10m.

I will investigate further and report any new results on the reflector.

73
Wolf * DK1IP * DQ1P


Re: KPA1500 PS produces RF noise via mains cable

Bob Wilson, N6TV
 

Looks like my embedded images may have been stripped by the Groups.IO reflector.  You can see the before/after here in this Google shared photo album:


73,
Bob, N6TV

On Wed, Feb 20, 2019 at 9:07 AM Bob Wilson, N6TV <n6tv@...> wrote:

I replaced the Elecraft cable with a very high quality RG-400 BNC cable from DX Engineering, and this made a huge improvement in power supply "noise" visible on my P3.


Re: KPA1500 PS produces RF noise via mains cable

Bob Wilson, N6TV
 

Wolf,

If you don't hear any noise in the receiver, or see the S-meter go up on your K3 at the same time that the noise floor appears to rise on your P3, then it's probably just leakage into the P3 itself.

Did you try putting a ferrite on the DC power cable to the P3?

Did you try replacing, reinserting, or re-routing the BNC cable between the P3 and the K3?  Many P3 BNC cables were shipped with poor shielding, so they pick up noise very easily.  It's also easy for the BNC connector to be connected improperly.

I replaced the Elecraft cable with a very high quality RG-400 BNC cable from DX Engineering, and this made a huge improvement in power supply "noise" visible on my P3.

Using RG-8 BNC cable shipped with P3:



Using RG-400 BNC cable from DX Engineering:



Additionally, the small slide switch on the back of the P3 between the IF IN and IF OUT connectors should be in the OFF position, assuming you have nothing connected there.

Finally, the shielding of the P3 case can also be poor, so you may want to take off the top cover and scrape any paint that could be preventing a good electrical connection to the rest of the P3 case.

73,
Bob, N6TV

On Sun, Feb 17, 2019 at 2:59 AM Wolf E. Rose <dk1ip@...> wrote:
Hi friends,

tnx very much for your different answers here on the reflector and as PM (especially from Jeff AC0C) trying to help me. I very much appreciate it!
I'm sorry about my bad English, but I think that from most of the answers I didn't express clearly what my problem is.

There's is no problem when I use the amp txing. The radiated (and wanted) RF (750W legel limit in DL) doesn't harm anything in my house or with my neighbours (I live in a suburban neighborhood on a 700 square meter small lot. My tower is next to my house. The 80m InvVee stretched from one corner to the opposite of my lot.).

The problem is in receive mode only. The noise level on 20m this Sunday morning is around -110dBm with 100kHz bandwidth from the screen of my P3. Only the PS of my KPA1500 is switched ON by the rear switch. RF deck and PS are connected with the DC power cable and the DA-15 control cable. All connections are o.k., the APPs of the 50V cable are fully inserted.

As soon as I switch on the RF deck with its front push button the noise level on P3's screen (same bandwidth) immediately rises up to -94dBm . I assume that the high voltage switcher PS inside the KPA1500 PS deck is producing some broad band switcher mode noise we all learned from using cheap China made wall mounted PS.

As I wrote in my first posting I could bring the noise floor down with some ferrites on the AC line cable. But not completely.

I think I have to write Elecraft support describing my problem.

73 and a nice Sunday to all of you
Wolf * DK1IP * DQ1P

ps.: KPA1500 is #522


On Grounding and Bonding

Bob McGraw - K4TAX
 

On grounding and bonding.......Obtain the ARRL book by Ward Silver, N0AX "GROUNDING and BONDING for the Radio Amateur". 

73
Bob, K4TAX


Filter Trade

KE8G
 

Hi All,
I recently purchased a second hand K3s with sub receiver and without carefully looking into things, I purchased two KFLA-1.0Khz filters from a ham off the list here.  I returned to my Ohio QTH (where the rig is) only to find out the main receiver already has one installed, so I only need one for the sub receiver.

I am looking for someone on the list that has a KFLA-250 Hz in excess to their needs that they would like to trade.

Please let me know.
Thanks in advance,
73 de Jim - KE8G


Re: Elecraft-K3] - Re: KPA1500 PS produces RF noise via mains cable

Dan Abell
 

Don,
Thanks for providing advice from a pro. Way too much advice from those who just have opinions. Sometimes I get real value from reading the posts like yours. Finally can you elaborate a bit on “grounding”? What is your advice with respect to grounding/bonding the shack? Again, thank you for your advice.
Dan w3dka

On Feb 18, 2019, at 01:15, Don Jones <ko7i@...> wrote:

John,

I used 4 to 5 turns on a Ferrite #0475167281 clamp-on bead. Basically I wrapped as many turns as the bead would accept. I did that to each and every electronic device.

As a side note, I managed to whack my laptop PC this weekend during the ARRL DX CW contest running 1kW on both 40 & 20 meters. The desktop station PC was not affected. I turned off the laptop and set it aside.

Vy 73, Don KO7i





R: R: [Elecraft-K3] K-POD question - these are my settings

IK4EWX
 

 

Inviato da Posta per Windows 10

 

Da: Bob Bennett via Groups.Io
Inviato: lunedì 18 febbraio 2019 18:19
A: Elecraft-K3@groups.io
Oggetto: Re: R: [Elecraft-K3] K-POD question

 

Thank you IK4EWX. Grazie. I did find some interesting info on the sites you shared. I found my answer there and now have all the keys of the K-Pod programmed for each band CW. 

nz2z

 


Mail priva di virus. www.avast.com


Re: R: [Elecraft-K3] K-POD question

Bob Bennett
 

Thank you IK4EWX. Grazie. I did find some interesting info on the sites you shared. I found my answer there and now have all the keys of the K-Pod programmed for each band CW. 

nz2z


Re: Elecraft-K3] - Re: KPA1500 PS produces RF noise via mains cable

Don Jones
 

John,

I used 4 to 5 turns on a Ferrite #0475167281 clamp-on bead. Basically I wrapped as many turns as the bead would accept. I did that to each and every electronic device.

As a side note, I managed to whack my laptop PC this weekend during the ARRL DX CW contest running 1kW on both 40 & 20 meters. The desktop station PC was not affected. I turned off the laptop and set it aside.

Vy 73, Don KO7i


Re: Elecraft-K3] - Re: KPA1500 PS produces RF noise via mains cable

john ni0k
 

Don,

What ferrites are you using? The snap-on ferrites that I've tried have not helped any problems at my location. Two problems: RF feedback from my 80M dipole especially when running more than 100W, and video buzz on the local 440 repeater receive from my DirecTV receivers.

73,
-John NI0K

Sunday, February 17, 2019 12:40 PM
Sorry for this long winded post.

Reading these posts about RFI in the shack when running high power I can't help but question station grounding. Most of this sounds like RFI driven by common RF susceptibility issues. I am curious, are these issues occurring during receive mode too? If so, adding some multi-turn common mode ferrite chokes to the AC power lines of the amplifier should help - a lot. They won't saturate during receive mode operation. During transmit mode you don't care if the ferrite chokes saturate and become ineffective.

As an EMC engineer who has done some Part 97 certification work, those certs do not come easy and I am certain the engineering team at Elecraft spent a lot of time (and money) designing a clean power supply. The importance of proper grounding cannot be overstated.

As far as for knocking out internet cable modems - I've done that myself using my 40M 1/4 wave vertical with 32 radials on the ground. My solution was to place a common mode choke one the RG213 coax about 45 feet from the antenna (out side of the radial field) and then add multi-turn ferrite bead chokes to the power supply leads of the home electronic devices experiencing RF susceptibility problems.

I run a K3S with an ACOM 2000A amplifier here. Anything above 750W was causing problems at my home. Adding chokes to the consumer grade home electronic devices solved the problem. These consumer grade electronics are only designed to survive 3Vrms of common mode RFI on the power leads and are tested with only 0.8m long interconnecting cables (in most cases) during the compliance process. This is why additional common mode filtering makes such a big difference on the home electronic devices.

Vy 73, Don KO7i






Re: Elecraft-K3] - Re: KPA1500 PS produces RF noise via mains cable

Don Jones
 

Sorry for this long winded post.

Reading these posts about RFI in the shack when running high power I can't help but question station grounding. Most of this sounds like RFI driven by common RF susceptibility issues. I am curious, are these issues occurring during receive mode too? If so, adding some multi-turn common mode ferrite chokes to the AC power lines of the amplifier should help - a lot. They won't saturate during receive mode operation. During transmit mode you don't care if the ferrite chokes saturate and become ineffective.

As an EMC engineer who has done some Part 97 certification work, those certs do not come easy and I am certain the engineering team at Elecraft spent a lot of time (and money) designing a clean power supply. The importance of proper grounding cannot be overstated.

As far as for knocking out internet cable modems - I've done that myself using my 40M 1/4 wave vertical with 32 radials on the ground. My solution was to place a common mode choke one the RG213 coax about 45 feet from the antenna (out side of the radial field) and then add multi-turn ferrite bead chokes to the power supply leads of the home electronic devices experiencing RF susceptibility problems.

I run a K3S with an ACOM 2000A amplifier here. Anything above 750W was causing problems at my home. Adding chokes to the consumer grade home electronic devices solved the problem. These consumer grade electronics are only designed to survive 3Vrms of common mode RFI on the power leads and are tested with only 0.8m long interconnecting cables (in most cases) during the compliance process. This is why additional common mode filtering makes such a big difference on the home electronic devices.

Vy 73, Don KO7i