Date   

Re: Receiver muting

Wes
 

Careful.  Test mode doesn't survive a power cycle. Even if it did there is still signal from the TX that reaches the output.  I have brought this to Wayne's attention and he informs me that the entire TX strip is active, the only thing turned off in TX Test mode is the carrier.

I have a spare K3 that I would like to use as a second RX and have the same issue.

Wes  N7WS

On 4/24/2018 3:56 PM, Bruce Beford N1RX wrote:
One possibility that occurs to me would be to put the K3 in "TX Test" mode so that it does not actually transmit. Then make the appropriate interface/connections so that it keys at the same time as your boat anchor transmitter. I am assuming that you already are using some form of T/R relay to switch between the two rigs.

Good luck, and have fun!
Bruce N1RX


Re: Receiver muting

Bruce Beford N1RX
 

One possibility that occurs to me would be to put the K3 in "TX Test" mode so that it does not actually transmit. Then make the appropriate interface/connections so that it keys at the same time as your boat anchor transmitter. I am assuming that you already are using some form of T/R relay to switch between the two rigs.

Good luck, and have fun!
Bruce N1RX


Receiver muting

John Moore
 

I frequently like to get on 80m or 40m AM and chat with my old friends.  My old boat anchor receivers (SX100, SX101, Drake 2A, R4, and HQ170a) can’t compare to the K3s on AM with the AM filter.  
Is there a way of muting the K3 so I can use one of my old AM transmitters.  It has been suggested that I just switch off the speaker but I am uncomfortable with that idea.
I would appreciate any ideas.
73’s
John N5RK


KX 2nd L👀K-- extended 80 character LCD Display of KX2 or KX3

Anthony Luscre
 

KX 2nd L👀K- is an accessory for use with the Elecraft KX2 or KX3 Radios. The display is 80 characters and scrolls as new text is decoded.
 
I wanted a way to display more characters so I designed the 2nd Look. It is offered as a kit to others that want a bigger display at a low price.
The display is 80 characters (40 per line)
Based on Arduino Nanao
Open Source Software allows user modifications 
Does not require a computer
Lightweight and convenient for field use
Offered as a complete, easy to assemble kit
Low parts count
Simple soldering with no surface mount parts to solder
Choice of 4 LCD displays
  • Black on Amber (very similar to KX3/KX2)
  • Dark Blue/black on Yellow-Green
  • Black on White 
  • White on Black
Powered by 5-volts DC via common Mini USB connect used in phone chargers & battery packs
 
For details and to order a kit visit- 
www.k8zt.com/2ndlook 

This was also described in an article in March 2018 CQ Magazine


Re: K3- Low Power Amplifier--RD15HVF1 FET failure?

mikerodgerske5gbc
 

I think if 1 were bad, power out would be zero. With power set to zero they will get hot to the touch fast. If ones bad it'll be cool. 
You should be able to find info on this perhaps via babble or google. 
I've been there done that but don't have the 100w amp. 

73
Mike R

7!
Absolutely Awesome 

On Apr 22, 2018, at 6:20 AM, Doug, VE3MV <dougve3mv@...> wrote:

GM Mark:  

If, as  you suggest, one of the FET's in the LPA has died, I don’t think you would still be able to get 100W out.  Perhaps a intermittent connection on the pins / connecter between the LPA and the main board. 

What happens if you just rerun the TX Gain Calibration?

73 & Good Luck,

Doug  VE3MV

 

On 2018-Apr-22, at 2:01 AM, M Gerber <msgerber@...> wrote:

My K3 with built-in 100W amp power out into nice dummy load and LP100 wattmeter reads reasonably accurately as PWR is advanced to 6W. Then, with PWR set 6-12W, RF out maxes at ~4-8W depending on band. With PWR set at 12W, which is the transition to turn on the 100W amp, RF out jumps accurately to 12W out and climbs normally from there as PWR setting is advanced. The RF out of my K3 previously had been remarkably accurate from 0-100W on virtually all bands (less RF out on 6 and 10M) prior to this problem.

I am pretty sure that one of the (2) RD15HVF1 FET's in the Low Power Amplifier has died.

I did a search through the group archive and did not see anything related. 

 The FET's are cheap and my inclination is to replace both and rerun the Tx Gain Calibration.

Has anyone else had a similar problem? 

Thanks and 73

Mark WH7W


Re: small problem in 6M

Jose Garcia
 

Keith..thanks .. problem solved.

73 All.

Jose EA7BJ.


Re: small problem in 6M

1king26@...
 

Jose; You need to put in the offset for your 2.7 filter!!  Should be something like -.84  It should be on the sticker on the inside of the top cover.
Keith WE6R


Re: K3- Low Power Amplifier--RD15HVF1 FET failure?

Doug, VE3MV
 

GM Mark:  

If, as  you suggest, one of the FET's in the LPA has died, I don’t think you would still be able to get 100W out.  Perhaps a intermittent connection on the pins / connecter between the LPA and the main board. 

What happens if you just rerun the TX Gain Calibration?

73 & Good Luck,

Doug  VE3MV

 

On 2018-Apr-22, at 2:01 AM, M Gerber <msgerber@...> wrote:

My K3 with built-in 100W amp power out into nice dummy load and LP100 wattmeter reads reasonably accurately as PWR is advanced to 6W. Then, with PWR set 6-12W, RF out maxes at ~4-8W depending on band. With PWR set at 12W, which is the transition to turn on the 100W amp, RF out jumps accurately to 12W out and climbs normally from there as PWR setting is advanced. The RF out of my K3 previously had been remarkably accurate from 0-100W on virtually all bands (less RF out on 6 and 10M) prior to this problem.

I am pretty sure that one of the (2) RD15HVF1 FET's in the Low Power Amplifier has died.

I did a search through the group archive and did not see anything related. 

 The FET's are cheap and my inclination is to replace both and rerun the Tx Gain Calibration.

Has anyone else had a similar problem? 

Thanks and 73

Mark WH7W


K3- Low Power Amplifier--RD15HVF1 FET failure?

M Gerber
 

My K3 with built-in 100W amp power out into nice dummy load and LP100 wattmeter reads reasonably accurately as PWR is advanced to 6W. Then, with PWR set 6-12W, RF out maxes at ~4-8W depending on band. With PWR set at 12W, which is the transition to turn on the 100W amp, RF out jumps accurately to 12W out and climbs normally from there as PWR setting is advanced. The RF out of my K3 previously had been remarkably accurate from 0-100W on virtually all bands (less RF out on 6 and 10M) prior to this problem.

I am pretty sure that one of the (2) RD15HVF1 FET's in the Low Power Amplifier has died.

I did a search through the group archive and did not see anything related. 

 The FET's are cheap and my inclination is to replace both and rerun the Tx Gain Calibration.

Has anyone else had a similar problem? 

Thanks and 73

Mark WH7W


Re: No IF signal showing up on P3

hotrod541@...
 


-- I had the same problem with my K-3 and found that the cable that runs to K-3 had bad connection.  I sprayed with contact cleaner and no longer a problem.  I had problem after doing upgrades.  The early cables also had some problems, I don't know how old your K-3 is.
Buddy, KJ4ZSI


Re: small problem in 6M

Jose Garcia
 
Edited

Hi Bob, yes, I've been looking at those parameters but the problem continues.
Now I have uploaded a video where the reception difference between filter 1 and 2 is better appreciated.
With the F2 I receive S9 a beacon and with the F1 the signal drops to S5, 24db less.
I have not modified the gain of any filter.
It only happens in the 6M band. the others bands are fine.

Here the link for the video
https://youtu.be/HdTgXTpIjRE

Here is a link to see the filter settings https://ibb.co/jcphOc

EA7BJ Jose.


Problem with K3 and KPA on 6 meters

Richard Lawn
 

I tried to use the amp on 6 meters the other day and discovered a strange problem. I was using WSJTx on a digital mode and wanted the run about 200 watts. For some reason the K3 wasn’t activating the amp unless I tweaked the power pot on the K3 just a little bit and then suddenly the amp would activate. I did not notice the problem on other lower bands.

Any thoughts?
Rick, W2JAZ 
--


No IF signal showing up on P3

Mel Farrer, K6KBE <farrerfolks@...>
 

Just relocated the station and reconnected everything up.  K3 and the P3 act normally all displays are right, but no IF signals from the K3?  Coax cable checks out good. Where did I lose the signal????


Mel, K6KBE


K3 (2), KPA500 and P3 for sale

rick.22202@...
 

I'm wondering if I might take a bit of bandwidth to pass on the following ...

Elecraft Equipment for Sale

K3 #1
SN 69XX
100W
KAT3 antenna tuner
Dual receivers, both upgraded to current K3SYN3A synthesizer
Upgraded to current KXC3B RX antenna, IF out and transverter interface
KTCX03-1 high stability TXCO
KDVR3 digital voice recorder
KFL3A400 filter, main RX
KFL3A2.8 filter, main RX (upgrade from 2.7)
“Neogrip” ring used on K3S (upgrade)
Powerpole connectors (new)
Sent to factory July 2017 for PM and not used since
Yellow Pelican 1560 case will be included if sold locally (1 available)
$3200

K3#2
SN 17XX
100W
KAT3 antenna tuner
Receiver upgraded to K3SYN3A synthesizer
Upgraded to current KXV3B RX antenna, IF out and transverter interface
Powerpole connectors (new)
In use until 04/18
Yellow Pelican 1560 case will be included if sold locally (1 available)
$1950

KPA500
SN 00XX
Factory assembled and returned to the factory for PM 04/16 and not used since; MOSFETs (Q1, Q2) upgraded at that time
A couple of minor scratches on the top near the back
Yellow Pelican 1560 case will be included if sold locally
$1900

P3
SN 31XX
Includes new coaxial power plug, BNC/BNC cable and serial cable
$550

All items are in excellent condition - no smoking, covered when not in use, etc.  All operate 100%.  Two of these items were spares and two were in use until just recently.  Local (NE Ohio) testing and pick-up is welcome and encouraged.  Photos are available to those seriously interested.  Please contact me at the address shown on qrz.com. 

73!

Rick, K8GI


Re: small problem in 6M

Bob McGraw - K4TAX
 

Check the FLx ON setting.  See page 59 in the manual.   Used to specify which filters are available during receive. 

73
Bob, K4TAX
K3S s/n 10163


Re: Upload files

Martin Kratoska <martin@...>
 

It sounds interesting. I want to have such schematic!

73,
Martin, OK1RR

Dne 20.4.2018 v 01:10 Jack napsal(a):

I have a schematic for a 10MHz rubidium oscillator that I designed, and use with my K3S. Can I get permissions to upload a file?


Upload files

Jack <repair@...>
 

I have a schematic for a 10MHz rubidium oscillator that I designed, and use with my K3S. Can I get permissions to upload a file? 


Re: small problem in 6M

Jose Garcia
 

Hi Joe, thanks for answering, I only work in cw ....
The problem only in the 6M band, in other bands this problem does not exist.
I upload a video where you can see the problem better, see how the background noise disappears
when moving from filter 1 to 2, at this time there are no stations in the band.

https://youtu.be/hQNVkdmNuWU

Jose EA7BJ


Re: wsjt-x

Bob McGraw - K4TAX
 

This is from the Elecraft engineer that wrote the code for that part of the program.   I doubt that he is a NUBE.

"The recommendation from Elecraft is the indication on the ALC bargraph is 4 bars on solid with the 5th bar flickering." 

Anything less  alludes to the system power hunting.    In DATA A mode the CMP  {speech compression} is automatically OFF and the TX EQ is set to 0 dB.

73
Bob, K4TAX 
K3S s/n 10163


Re: small problem in 6M

AJ3O
 

With the filters you have, as long as you are not in AM or FM modes it should work.
CW, SSB, Digital should be working

If you ARE trying to use AM or FM, you need at a minimum the 13 Khz filter installed.
Per Elecraft's site:

AM - 6 Khz or 13 Khz filters may be installed
FM - 13 Khz must be installed

Joe / AJ3O

On Wednesday, April 18, 2018, 11:48:38 PM EDT, Jose Garcia <ea7bj@...> wrote:


Hi All.
I have a little problem in my k3 that only happens in the 6M band.
I have two filters, F1 2.7 and F2 500.
When passing from F2 to F1 the K3 goes deaf.
It's not a serious problem because I usually always work with the F2 filter, but I'm worried about this happening.
I repeat, it only happens in the 6M band, the rest of the bands are ok.

73 EA7BJ Jose.

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