Date   

Using a Bug key with the K3s

wb6bee
 

I have had three instances of unexplained events, using a Bug key with the K3s.   I am 100 % cw and only use a bug.   My speed is about 26-27 wpm on the key.   

1.  Event one:   I added the TXMON to the P3 to see if I could use it for evaluating keying, hoping it would show things like scratchy dots, etc.   It didn't show much at all, actually.   What was odd was the with some regularity, but no consistency, the display would go from the keying envelope to a line of static, similar looking to band noise on a spectrum analyzer.   A friend of mine, also using a Bug with the TXMON, was experiencing a similar situation.   I reported it to Elecraft Tech. They sent me, one component at a time, a new TXMON.   Nothing changed, the unit continued to have the erratic display.   Being somewhat useless, I put the TXMON in the box of unused parts.   Elecraft tech never followed up with the issue, probably not that many bug users with the TXMON.

2. Event Two:  Noted in this relfector some weeks ago.   Minor frequency shifts ( a few hertz) while keying with a bug.   

3. Event Three:   I have a new KPA 1500.   Twice now, when in a long transmission, the amp will kick out.   No apparent reason, but my keying in the CW monitor would sound like something was wrong with the bug, loose weight or something.   Then, the amp would be in a fault condition.   In both cases, the fault log would show an overdrive condition.  My normal drive for the KPA from the K3s is about 30 watts or so (depending).   The default log showed drive at over 65 watts.   The first time it happened, I thought perhaps I hit something on the front of the K3s.   The second time, no such possibility (probably  not the first time either).   The first time was 160 meters.  The second time was 80 meters.   A common denominator is the 68 ft vertical antenna used for both bands.  

These could all be related, or they could not.   Elecraft tech indicated they were going to try to use a bug to replicate the last event.   It is so irregular that I don't that would work.     However, K3s are so popular, maybe other owners have had issues with using a bug with the K3s

Don
WB6BEE


Re: Remote antenna switching

Larry K8UT <k8ut@...>
 

I built my own - a remote Raspberry Pi controller that uses 4 of its GPIO ports for BCD band decoding, and SainSmart relays for antenna control. A Windows console communicates with the Raspberry Pi controller via TCP packets. My software is free. The hardware will cost you about $75.

You can read about FreqEZ here: www.hamprojects.info/freqez

-larry (K8UT)

------ Original Message ------
From: "Jeff Wheeler W7JW" <w7jw@...>
To: "Elecraft" <Elecraft-K3@groups.io>
Sent: 2019-01-13 16:15:53
Subject: [Elecraft-K3] Remote antenna switching

For the guys who run their K3 remotely, how do you change antennas?  Is there an antenna switch/interface that reads the band from the K3 available?
 
Tnx Jeff W7JW


Re: Remote antenna switching

Martin Sole
 

I built my own, a BCD to one of x decoder chip that I pulled from something else. I used opto-couplers on the input to isolate the K3 ACC socket band select pins, transistor switches on the outputs to drive relays in the antenna switch box. A little hardware programming with links gets you the same antenna on some bands or a different one as needed. Antenna selection follows band change without intervention. Control box has a manual select switch as an override. Maybe $10 for the bits I didn't have on hand.

Martin, HS0ZED



On 14/01/2019 00:15, Jeff Wheeler W7JW wrote:
For the guys who run their K3 remotely, how do you change antennas?  Is there an antenna switch/interface that reads the band from the K3 available?
 
Tnx Jeff W7JW


Re: Remote antenna switching

Mark Morin
 

I second Jim KE8G’s comment that the KAT500 and its matching remote control software (free from Elecraft) is a great solution. As my increasingly complicated array of antenna choices grows, I find that I can’t limit myself to 3 antennas. So, I use a Raspberry Pi running RemoteQTH software to remotely control additional antenna relays. The RemoteQTH server presents a small web page allowing me to remotely select the state of up to 24 relays. It also allows me to monitor the temperature (and turn on a heater if required), and remotely reset just about any device that might require it. It’s been running reliably for a few years now. I believe they do sell some antenna switch hardware, but I just use the (free) software and home-brewed the rest. Here is the link for the free remoteqth server software (disclaimer: I have not connection with RemoteQTH besides being a long-time user).


Mark VA2MM


Re: Remote antenna switching

Joe Subich, W4TV
 

Is there an antenna switch/interface that reads the band from the K3 available?
Several ... the Elecraft KRC2 reads band via the Elecraft Aux Bus (ACC
connector). The microHAM Station Master reads frequency via the CAT
(RS-232) port. A simple BCD to 1 of 10 decoder will read band via
the ABCD signals on the ACC port.

73,

... Joe, W4TV


On 2019-01-13 4:15 PM, Jeff Wheeler W7JW wrote:
For the guys who run their K3 remotely, how do you change antennas? Is there an antenna switch/interface that reads the band from the K3 available?
Tnx Jeff W7JW


Re: Remote antenna switching

Dwight Bosselman <NS9I@...>
 

I use Green Heron GH Everywhere Wireless Base and Remotes - they work great.

73 Dwight NS9I

On 1/13/2019 3:15 PM, Jeff Wheeler W7JW wrote:
For the guys who run their K3 remotely, how do you change antennas?  Is there an antenna switch/interface that reads the band from the K3 available?
 
Tnx Jeff W7JW


Re: Remote antenna switching

Jeff Wheeler W7JW
 

Tnx Jim, I should have been more specific. How do KPA1500 users (with only 2 antenna ports) switch between multiple antennas?
 
Jeff W7JW
 

Sent: Sunday, January 13, 2019 4:24 PM
Subject: Re: [Elecraft-K3] Remote antenna switching
 
Hi Jeff,
It all depends on how you are running it remotely.  I have the KAT500 and use the program that Elecraft has developed.  I can switch to any of the 3 antennas, tune and watch SWR remotely.
 
I'll let other chime in on how they do it.
 
73 de Jim - KE8G
 
On Sun, Jan 13, 2019 at 4:15 PM Jeff Wheeler W7JW <w7jw@...> wrote:
For the guys who run their K3 remotely, how do you change antennas?  Is there an antenna switch/interface that reads the band from the K3 available?
 
Tnx Jeff W7JW


Re: Remote antenna switching

KE8G
 

Hi Jeff,
It all depends on how you are running it remotely.  I have the KAT500 and use the program that Elecraft has developed.  I can switch to any of the 3 antennas, tune and watch SWR remotely.

I'll let other chime in on how they do it.

73 de Jim - KE8G

On Sun, Jan 13, 2019 at 4:15 PM Jeff Wheeler W7JW <w7jw@...> wrote:
For the guys who run their K3 remotely, how do you change antennas?  Is there an antenna switch/interface that reads the band from the K3 available?
 
Tnx Jeff W7JW


Remote antenna switching

Jeff Wheeler W7JW
 

For the guys who run their K3 remotely, how do you change antennas?  Is there an antenna switch/interface that reads the band from the K3 available?
 
Tnx Jeff W7JW


Re: Transmit Phase Noise

Rob Sherwood
 

Hi Dale,

I don’t know, but I doubt the type of transistor is significant. The really close-in noise is affected by the cooling fans, an issue that N0QO and I found a year ago.  Elecraft supposedly fixed that with an electrolytic capacitor addition to filter the electrical noise from the fans.  I had to do the same thing with my aftermarket fan cooling kit for the IC-781.  

Rob. NC0B


On Jan 13, 2019, at 4:23 AM, dalej via Groups.Io <dalej2@...> wrote:

Rob,

How about the K3 with the old bipolar transistors?  Is there much difference or none at all?

Dale, K9VUJ



On 12, Jan 2019, at 12:06, Rob Sherwood <rob@...> wrote:

Here is some data I have at both 100 watts and 30 or 35 watts for six rigs.
Different lab, different measuring equipment, different rig samples, so don’t expect absolute correlation with ARRL data.
ARRL lab data only measures phase noise, not composite noise (phase and AM noise).
Data from Contest University presentations of mine.
Note: While the listing are sorted by column 1, the ranking varies with frequency offset.
Rob
NC0B
 
Transmit Composite Noise Rig Comparisons 20 meters
Best at maximum power output, but degrades at lower power levels
 
Rig @ 100 watts                10 kHz offset, dBc/Hz     20 kHz offset, dBc/Hz     100 kHz offset, dBc/Hz
K3S                                         -141                                       n/a                                         -143
IC-7300                                 -130                                       n/a                                         -132
IC-7851                                 -129                                       n/a                                         -138
IC-7610                                 -127                                       -129                                       n/a
TS-890S                                -120                                       -129                                       n/a
FTdx-3000                           -120                                       n/a                                         -121
 
Rig @ 30 watts                   10 kHz offset, dBc/Hz     20 kHz offset, dBc/Hz     100 kHz offset, dBc/Hz
K3S                                         -132                                       n/a                                         -140
IC-7851                                 -123                                       n/a                                         -133
IC-7610                                 -122*                                     -124*                                     n/a
FTdx-3000                           -117                                       n/a                                         -117
TS-890S                                -113*                                     -122*                                     n/a
IC-7300                                 -112                                       n/a                                         -120
 
* = Power level was 35 watts
n/a = data not available
Rev D
 



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Re: Odd K3 KIO3 behaviour (fw related?)

AB1DD
 

Scott,
If you haven't got it fixed yet, try this:
l<IF THE SPEAKER IS NOT WORKING with headphones unplugged: Locate the CONFIG:SPKR+PH menu
entry. Tap ‘1’ on the numeric keypad until you see PH.R SW– . The minus sign (-)indicates inverted switch
logic for the jack for the newer KIO3 audio board. Exit the menu and re-save your configuration using K3 Utility.

You were right in that it is a firmware thing, it was implemented a while ago, due to a part change. You would have to read a bunch of release notes to find it!
Carl
AB1DD


Re: Transmit Phase Noise

southdaleus
 

Rob,

How about the K3 with the old bipolar transistors?  Is there much difference or none at all?

Dale, K9VUJ



On 12, Jan 2019, at 12:06, Rob Sherwood <rob@...> wrote:

Here is some data I have at both 100 watts and 30 or 35 watts for six rigs.
Different lab, different measuring equipment, different rig samples, so don’t expect absolute correlation with ARRL data.
ARRL lab data only measures phase noise, not composite noise (phase and AM noise).
Data from Contest University presentations of mine.
Note: While the listing are sorted by column 1, the ranking varies with frequency offset.
Rob
NC0B
 
Transmit Composite Noise Rig Comparisons 20 meters
Best at maximum power output, but degrades at lower power levels
 
Rig @ 100 watts                10 kHz offset, dBc/Hz     20 kHz offset, dBc/Hz     100 kHz offset, dBc/Hz
K3S                                         -141                                       n/a                                         -143
IC-7300                                 -130                                       n/a                                         -132
IC-7851                                 -129                                       n/a                                         -138
IC-7610                                 -127                                       -129                                       n/a
TS-890S                                -120                                       -129                                       n/a
FTdx-3000                           -120                                       n/a                                         -121
 
Rig @ 30 watts                   10 kHz offset, dBc/Hz     20 kHz offset, dBc/Hz     100 kHz offset, dBc/Hz
K3S                                         -132                                       n/a                                         -140
IC-7851                                 -123                                       n/a                                         -133
IC-7610                                 -122*                                     -124*                                     n/a
FTdx-3000                           -117                                       n/a                                         -117
TS-890S                                -113*                                     -122*                                     n/a
IC-7300                                 -112                                       n/a                                         -120
 
* = Power level was 35 watts
n/a = data not available
Rev D
 


Re: Transmit Phase Noise

harry latterman <harrylatterman@...>
 

Thanks Joe. Interesting to know.  Since I will never use a AMP with the radio and I do run typically 100 to 150 watts, I hope that cleans up some of my TX.  The RX and all the hooks are very impressive then the bands are crowded and a mess. I am still a fanboy of Elecraft and always will be. Guess that is why I still have my K-Line and KX2.  In the past it was K2/10, K2/100 (in various configurations), K1-4, KX1, KX3 and KX-Line and two K3's (now one). My Icom list is far longer, but with the exception of a IC-756PROII most where in the shake for a year or less. So far I have had a K3 for over 10 yrs and counting. Thank you again

73 GN Harry K7ZOV

On Saturday, January 12, 2019, 8:07:47 PM MST, Joe Subich, W4TV <lists@...> wrote:



From the ARRL Product Review, The FTdx5000 has transmit phase noise
of -120 dBc @ 2 KHz, and approximately -130dBc from 10 KHz to 1 MHz.
As is typical of recent Yaesu products, the phase noise is 6 to 10 dB
worse than similar transceivers from other manufacturers.

At one time Icom was the king of dirty synthesizes but Yaesu hold that
crown for the last decade or so.

73,

    ... Joe, W4TV


On 2019-01-12 4:23 PM, harry latterman via Groups.Io wrote:
>  Thank you for posting the data.  Looks interesting and a bit surprising. However you forgot my really cool 1 yr old FTdx5000MPL... You said it was a bit better then the FTdx3000. It would be interesting to see how it stacks up.  The radio was from a trade and never used. As of December it was only 1 yr old and more radio, with more features then I could ever imagine or expect.... My 3 main radios are K3/100 with the KSYN3A added, A IC-7300 that I run mostly at 30 watts driving my KPA500 and KAT500 and the FTdx5000MPL. Seems from you list I might actually have 3 fairly decent radios. Oh I can not forget my take it everywhere jewel, the KX2.  So if you do have the 5000MPL data I would love to see it. Post here or direct email. Your choice.
> 73 Harry K7ZOV
>
>      On Saturday, January 12, 2019, 11:06:30 AM MST, Rob Sherwood <rob@...> wrote:

>   
> Here is some data I have at both 100 watts and 30 or 35 watts for six rigs.

> Different lab, different measuring equipment, different rig samples, so don’t expect absolute correlation with ARRL data.

> ARRL lab data only measures phase noise, not composite noise (phase and AM noise).

> Data from Contest University presentations of mine.

> Note: While the listing are sorted by column 1, the ranking varies with frequency offset.

> Rob

> NC0B

>   

> Transmit Composite Noise Rig Comparisons 20 meters

> Best at maximum power output, but degrades at lower power levels

>   

> Rig @ 100 watts                10 kHz offset, dBc/Hz     20 kHz offset, dBc/Hz     100 kHz offset, dBc/Hz

> K3S                                         -141                                       n/a                                         -143

> IC-7300                                 -130                                       n/a                                         -132

> IC-7851                                 -129                                       n/a                                         -138

> IC-7610                                 -127                                       -129                                       n/a

> TS-890S                                -120                                       -129                                       n/a

> FTdx-3000                           -120                                       n/a                                         -121

>   

> Rig @ 30 watts                   10 kHz offset, dBc/Hz     20 kHz offset, dBc/Hz     100 kHz offset, dBc/Hz

> K3S                                         -132                                       n/a                                         -140

> IC-7851                                 -123                                       n/a                                         -133

> IC-7610                                 -122*                                     -124*                                     n/a

> FTdx-3000                           -117                                       n/a                                         -117

> TS-890S                                -113*                                     -122*                                     n/a

> IC-7300                                 -112                                       n/a                                         -120

>   

> * = Power level was 35 watts

> n/a = data not available

> Rev D

>   
>   
>
>




Re: Transmit Phase Noise

Joe Subich, W4TV
 

From the ARRL Product Review, The FTdx5000 has transmit phase noise
of -120 dBc @ 2 KHz, and approximately -130dBc from 10 KHz to 1 MHz.
As is typical of recent Yaesu products, the phase noise is 6 to 10 dB
worse than similar transceivers from other manufacturers.

At one time Icom was the king of dirty synthesizes but Yaesu hold that
crown for the last decade or so.

73,

... Joe, W4TV

On 2019-01-12 4:23 PM, harry latterman via Groups.Io wrote:
Thank you for posting the data.  Looks interesting and a bit surprising. However you forgot my really cool 1 yr old FTdx5000MPL... You said it was a bit better then the FTdx3000. It would be interesting to see how it stacks up.  The radio was from a trade and never used. As of December it was only 1 yr old and more radio, with more features then I could ever imagine or expect.... My 3 main radios are K3/100 with the KSYN3A added, A IC-7300 that I run mostly at 30 watts driving my KPA500 and KAT500 and the FTdx5000MPL. Seems from you list I might actually have 3 fairly decent radios. Oh I can not forget my take it everywhere jewel, the KX2.  So if you do have the 5000MPL data I would love to see it. Post here or direct email. Your choice.
73 Harry K7ZOV
On Saturday, January 12, 2019, 11:06:30 AM MST, Rob Sherwood <rob@nc0b.com> wrote:
Here is some data I have at both 100 watts and 30 or 35 watts for six rigs.
Different lab, different measuring equipment, different rig samples, so don’t expect absolute correlation with ARRL data.
ARRL lab data only measures phase noise, not composite noise (phase and AM noise).
Data from Contest University presentations of mine.
Note: While the listing are sorted by column 1, the ranking varies with frequency offset.
Rob
NC0B
Transmit Composite Noise Rig Comparisons 20 meters
Best at maximum power output, but degrades at lower power levels
Rig @ 100 watts                10 kHz offset, dBc/Hz     20 kHz offset, dBc/Hz     100 kHz offset, dBc/Hz
K3S                                         -141                                       n/a                                         -143
IC-7300                                 -130                                       n/a                                         -132
IC-7851                                 -129                                       n/a                                         -138
IC-7610                                 -127                                       -129                                       n/a
TS-890S                                -120                                       -129                                       n/a
FTdx-3000                           -120                                       n/a                                         -121
Rig @ 30 watts                   10 kHz offset, dBc/Hz     20 kHz offset, dBc/Hz     100 kHz offset, dBc/Hz
K3S                                         -132                                       n/a                                         -140
IC-7851                                 -123                                       n/a                                         -133
IC-7610                                 -122*                                     -124*                                     n/a
FTdx-3000                           -117                                       n/a                                         -117
TS-890S                                -113*                                     -122*                                     n/a
IC-7300                                 -112                                       n/a                                         -120
* = Power level was 35 watts
n/a = data not available
Rev D


Re: phase noise

Rob Sherwood
 

Field Day is the most likely place we run into both transmitted composite noise and serious RMDR limitations.  Multi-transmitter contesters, too, but they already know that is a big problem. 

Rob, NC0B


On Jan 12, 2019, at 6:11 PM, James C. Hall, MD via Groups.Io <heartdoc@...> wrote:

This has been a great thread and I spent a lot of today studying phase noise. It sounds like it’s really not a good idea to amplify QRP transceivers such as FT-817/818, KX1/2/3, etc.

Been looking at how this effects Field Day operations as well.

73, Jamie
WB4YDL


On Jan 12, 2019, at 5:17 PM, Rob Sherwood <rob@...> wrote:

Hi Fred,

 

You are not hurting the amp or the K3, but you are making the transmitted noise much worse.

 

Here is an example. 

 

I use an IC-7300 on 630 meters with a transverter that only requires 5 watts of drive. If I back off the Icom to 5 watts, my transmitted noise seriously degrades.  Since on 630m I need more loss on receive anyway, I put a 10-dB 75-watt Bird attenuator between the output of the 7300 and the input of the transverter.  Now I can run the 7300 at 50 watts instead of 5 watts.  This improved my transmitted noise by 9 dB.

 

On another subject in respect to the K3, if you are running the K3 at 10 watts, the PA is out of the circuit.  On SSB the odd-order transmit IMD (splatter) at 10 to 12 watts is poor compared if the K3 is run at 35 to 45 watts.  If I wanted a cleaner SSB signal from a transmit IMD standpoint, I would run the rig at around 35 watts and whatever the KPA-500 put out.  I would also have my K3 power supply set for 14. 5 volts, and have a nice short power cable from the power supply to the rig so the voltage drop in the wire was minimal.

 

Rob, NC0B

 

From: Elecraft-K3@groups.io [mailto:Elecraft-K3@groups.io] On Behalf Of Fred-K0FG
Sent: Saturday, January 12, 2019 3:23 PM
To: Elecraft-K3@groups.io
Subject: [Elecraft-K3] phase noise

 

After the discussion about phase noise I have a question.   When I want to operate at an output power of 100 watts, or a little above, I frequently turn on the KPA500 and turn the power out on the K3 down to 6-10 watts.  Was thinking I was being kind to the amp and to the K3.   Am I wrong in doing that?   Am I doing more harm than good?

Fred, K0FG

 


If this email is spam, report it to www.OnlyMyEmail.com



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Re: phase noise

James C. Hall, MD
 

This has been a great thread and I spent a lot of today studying phase noise. It sounds like it’s really not a good idea to amplify QRP transceivers such as FT-817/818, KX1/2/3, etc.

Been looking at how this effects Field Day operations as well.

73, Jamie
WB4YDL


On Jan 12, 2019, at 5:17 PM, Rob Sherwood <rob@...> wrote:

Hi Fred,

 

You are not hurting the amp or the K3, but you are making the transmitted noise much worse.

 

Here is an example. 

 

I use an IC-7300 on 630 meters with a transverter that only requires 5 watts of drive. If I back off the Icom to 5 watts, my transmitted noise seriously degrades.  Since on 630m I need more loss on receive anyway, I put a 10-dB 75-watt Bird attenuator between the output of the 7300 and the input of the transverter.  Now I can run the 7300 at 50 watts instead of 5 watts.  This improved my transmitted noise by 9 dB.

 

On another subject in respect to the K3, if you are running the K3 at 10 watts, the PA is out of the circuit.  On SSB the odd-order transmit IMD (splatter) at 10 to 12 watts is poor compared if the K3 is run at 35 to 45 watts.  If I wanted a cleaner SSB signal from a transmit IMD standpoint, I would run the rig at around 35 watts and whatever the KPA-500 put out.  I would also have my K3 power supply set for 14. 5 volts, and have a nice short power cable from the power supply to the rig so the voltage drop in the wire was minimal.

 

Rob, NC0B

 

From: Elecraft-K3@groups.io [mailto:Elecraft-K3@groups.io] On Behalf Of Fred-K0FG
Sent: Saturday, January 12, 2019 3:23 PM
To: Elecraft-K3@groups.io
Subject: [Elecraft-K3] phase noise

 

After the discussion about phase noise I have a question.   When I want to operate at an output power of 100 watts, or a little above, I frequently turn on the KPA500 and turn the power out on the K3 down to 6-10 watts.  Was thinking I was being kind to the amp and to the K3.   Am I wrong in doing that?   Am I doing more harm than good?

Fred, K0FG

 


If this email is spam, report it to www.OnlyMyEmail.com


Re: phase noise

Rob Sherwood
 

Hi Fred,

 

You are not hurting the amp or the K3, but you are making the transmitted noise much worse.

 

Here is an example. 

 

I use an IC-7300 on 630 meters with a transverter that only requires 5 watts of drive. If I back off the Icom to 5 watts, my transmitted noise seriously degrades.  Since on 630m I need more loss on receive anyway, I put a 10-dB 75-watt Bird attenuator between the output of the 7300 and the input of the transverter.  Now I can run the 7300 at 50 watts instead of 5 watts.  This improved my transmitted noise by 9 dB.

 

On another subject in respect to the K3, if you are running the K3 at 10 watts, the PA is out of the circuit.  On SSB the odd-order transmit IMD (splatter) at 10 to 12 watts is poor compared if the K3 is run at 35 to 45 watts.  If I wanted a cleaner SSB signal from a transmit IMD standpoint, I would run the rig at around 35 watts and whatever the KPA-500 put out.  I would also have my K3 power supply set for 14. 5 volts, and have a nice short power cable from the power supply to the rig so the voltage drop in the wire was minimal.

 

Rob, NC0B

 

From: Elecraft-K3@groups.io [mailto:Elecraft-K3@groups.io] On Behalf Of Fred-K0FG
Sent: Saturday, January 12, 2019 3:23 PM
To: Elecraft-K3@groups.io
Subject: [Elecraft-K3] phase noise

 

After the discussion about phase noise I have a question.   When I want to operate at an output power of 100 watts, or a little above, I frequently turn on the KPA500 and turn the power out on the K3 down to 6-10 watts.  Was thinking I was being kind to the amp and to the K3.   Am I wrong in doing that?   Am I doing more harm than good?

Fred, K0FG

 


If this email is spam, report it to www.OnlyMyEmail.com


Re: phase noise

Michael Blake <k9jri@...>
 

That’s an interesting question Fred as at 10 watts the low power amp is being driven pretty hard and the 100 watt amp is bypassed.  At 12 watts drive both the low power and the 100 watt amp are loafing but I am not sure that is good or bad as far as distortion goes :)

73 - Mike - K9JRI






On Jan 12, 2019, at 5:23 PM, Fred-K0FG <kzerofg@...> wrote:

After the discussion about phase noise I have a question.   When I want to operate at an output power of 100 watts, or a little above, I frequently turn on the KPA500 and turn the power out on the K3 down to 6-10 watts.  Was thinking I was being kind to the amp and to the K3.   Am I wrong in doing that?   Am I doing more harm than good?

Fred, K0FG


phase noise

Fred-K0FG
 

After the discussion about phase noise I have a question.   When I want to operate at an output power of 100 watts, or a little above, I frequently turn on the KPA500 and turn the power out on the K3 down to 6-10 watts.  Was thinking I was being kind to the amp and to the K3.   Am I wrong in doing that?   Am I doing more harm than good?

Fred, K0FG


Re: Transmit Phase Noise

harry latterman <harrylatterman@...>
 

Thank you for posting the data.  Looks interesting and a bit surprising. However you forgot my really cool 1 yr old FTdx5000MPL... You said it was a bit better then the FTdx3000. It would be interesting to see how it stacks up.  The radio was from a trade and never used. As of December it was only 1 yr old and more radio, with more features then I could ever imagine or expect.... My 3 main radios are K3/100 with the KSYN3A added, A IC-7300 that I run mostly at 30 watts driving my KPA500 and KAT500 and the FTdx5000MPL. Seems from you list I might actually have 3 fairly decent radios. Oh I can not forget my take it everywhere jewel, the KX2.  So if you do have the 5000MPL data I would love to see it. Post here or direct email. Your choice.

73 Harry K7ZOV

On Saturday, January 12, 2019, 11:06:30 AM MST, Rob Sherwood <rob@...> wrote:


Here is some data I have at both 100 watts and 30 or 35 watts for six rigs.

Different lab, different measuring equipment, different rig samples, so don’t expect absolute correlation with ARRL data.

ARRL lab data only measures phase noise, not composite noise (phase and AM noise).

Data from Contest University presentations of mine.

Note: While the listing are sorted by column 1, the ranking varies with frequency offset.

Rob

NC0B

 

Transmit Composite Noise Rig Comparisons 20 meters

Best at maximum power output, but degrades at lower power levels

 

Rig @ 100 watts                10 kHz offset, dBc/Hz     20 kHz offset, dBc/Hz     100 kHz offset, dBc/Hz

K3S                                         -141                                       n/a                                         -143

IC-7300                                 -130                                       n/a                                         -132

IC-7851                                 -129                                       n/a                                         -138

IC-7610                                 -127                                       -129                                       n/a

TS-890S                                -120                                       -129                                       n/a

FTdx-3000                           -120                                       n/a                                         -121

 

Rig @ 30 watts                   10 kHz offset, dBc/Hz     20 kHz offset, dBc/Hz     100 kHz offset, dBc/Hz

K3S                                         -132                                       n/a                                         -140

IC-7851                                 -123                                       n/a                                         -133

IC-7610                                 -122*                                     -124*                                     n/a

FTdx-3000                           -117                                       n/a                                         -117

TS-890S                                -113*                                     -122*                                     n/a

IC-7300                                 -112                                       n/a                                         -120

 

* = Power level was 35 watts

n/a = data not available

Rev D

 

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