Date   

Re: RS-232 to USB A cable KD8DZ

Bob McGraw - K4TAX
 

When I got into ham radio I built my transmitter from parts salvaged from discarded TV sets.  These were free.  I wasn't cheap nor frugal, I was in high school and didn't have much money to spend, period.   Later I got a job and was able to buy a few new parts.  And then later buy new radios.  

I think today hams look to buy and not build.  Thus the price is the first objective with most purchases.  Ham radio today is not an inexpensive hobby.    In that regard, I've learned many a hard lesson, "one gets what they pay for".   I often say when assisting others with issues, "that item should be put in a bucket of water three times and taken out twice".   In other words, it isn't worth keeping or using.   It is just junk and there is lots of that being sold today under the pretense of good merchandise.   The world has gotten into the model of less cost and lower margins to effect sales.  

73

Bob, K4TAX

On 11/4/2019 7:27 AM, Jerry wrote:

Ken,

 

My dad who has been gone since 1989 and was a ham in the 30’s used to say “Hams are cheap”, but that’s not politically correct today and some people’s feelings might be hurt.

 

Cheers,

 

Jerry, W1IE

 

From: Elecraft-K3@groups.io <Elecraft-K3@groups.io> On Behalf Of Ken Talbott
Sent: Monday, November 4, 2019 07:21 AM
To: Elecraft-K3@groups.io
Subject: Re: [Elecraft-K3] RS-232 to USB A cable KD8DZ

 

Hams are frugal

Ken ke4rg

 

From: Elecraft-K3@groups.io <Elecraft-K3@groups.io> On Behalf Of Mel Marcus
Sent: Sunday, November 3, 2019 10:15 PM
To: Elecraft-K3@groups.io
Subject: Re: [Elecraft-K3] RS-232 to USB A cable KD8DZ

 

I have been watching this thread concerning the usb to serial cable.  I am not sure why people just don't purchase the Elecraft one.

 

Mel

NE9A

-------- Original Message --------
Subject: Re: [Elecraft-K3] RS-232 to USB A cable KD8DZ
From: "Steve" <99sunset@...>
Date: Sun, November 03, 2019 5:22 pm
To: Elecraft-K3@groups.io

The inexpensive Chinese 6 dollar cables use the Prolific drivers which are available for download.  The better cables use FTDI.  The difficulty using the Prolific cables and drivers is that each time Microsoft updates drivers, it will replace your Prolific drivers with FTDI and your cable will fail to operate.  Save yourself the difficulty buy just using the better cable to begin with.  These are available from Elecraft or RT Systems.  


Re: RS-232 to USB A cable KD8DZ

Jerry
 

Ken,

 

My dad who has been gone since 1989 and was a ham in the 30’s used to say “Hams are cheap”, but that’s not politically correct today and some people’s feelings might be hurt.

 

Cheers,

 

Jerry, W1IE

 

From: Elecraft-K3@groups.io <Elecraft-K3@groups.io> On Behalf Of Ken Talbott
Sent: Monday, November 4, 2019 07:21 AM
To: Elecraft-K3@groups.io
Subject: Re: [Elecraft-K3] RS-232 to USB A cable KD8DZ

 

Hams are frugal

Ken ke4rg

 

From: Elecraft-K3@groups.io <Elecraft-K3@groups.io> On Behalf Of Mel Marcus
Sent: Sunday, November 3, 2019 10:15 PM
To: Elecraft-K3@groups.io
Subject: Re: [Elecraft-K3] RS-232 to USB A cable KD8DZ

 

I have been watching this thread concerning the usb to serial cable.  I am not sure why people just don't purchase the Elecraft one.

 

Mel

NE9A

-------- Original Message --------
Subject: Re: [Elecraft-K3] RS-232 to USB A cable KD8DZ
From: "Steve" <99sunset@...>
Date: Sun, November 03, 2019 5:22 pm
To: Elecraft-K3@groups.io

The inexpensive Chinese 6 dollar cables use the Prolific drivers which are available for download.  The better cables use FTDI.  The difficulty using the Prolific cables and drivers is that each time Microsoft updates drivers, it will replace your Prolific drivers with FTDI and your cable will fail to operate.  Save yourself the difficulty buy just using the better cable to begin with.  These are available from Elecraft or RT Systems.  


Re: RS-232 to USB A cable KD8DZ

Ken Talbott
 

Hams are frugal

Ken ke4rg

 

From: Elecraft-K3@groups.io <Elecraft-K3@groups.io> On Behalf Of Mel Marcus
Sent: Sunday, November 3, 2019 10:15 PM
To: Elecraft-K3@groups.io
Subject: Re: [Elecraft-K3] RS-232 to USB A cable KD8DZ

 

I have been watching this thread concerning the usb to serial cable.  I am not sure why people just don't purchase the Elecraft one.

 

Mel

NE9A

-------- Original Message --------
Subject: Re: [Elecraft-K3] RS-232 to USB A cable KD8DZ
From: "Steve" <99sunset@...>
Date: Sun, November 03, 2019 5:22 pm
To: Elecraft-K3@groups.io

The inexpensive Chinese 6 dollar cables use the Prolific drivers which are available for download.  The better cables use FTDI.  The difficulty using the Prolific cables and drivers is that each time Microsoft updates drivers, it will replace your Prolific drivers with FTDI and your cable will fail to operate.  Save yourself the difficulty buy just using the better cable to begin with.  These are available from Elecraft or RT Systems.  


Re: RS-232 to USB A cable KD8DZ

kelly@...
 

I ordered a cable with what I thought was an FTDI chip but it would not work. I deleted the Prolific driver and re-installed the FTDI driver but it still would not work. I even cut the cable apart and put the scope on it and saw that signal was going to the radio. In the end I bought the Elecraft cable and it worked perfectly first time.

Kelly Breed
AE6KZ

On Oct 31, 2019, at 10:46 AM, Michael Mickelson <mickelson@...> wrote:

Is the preferred chip set the Prolific PL2303 HXB for this cable?

de mike kd8dz

--
Michael Mickelson
J. Reid Anderson Professor of Physics and Astronomy, emeritus
Denison University
740-587-0687 H
740-644-1238 M
 


Re: Dirty Transmitters

Dale, K9VUJ
 

On the 75 meter band it takes fewer watts to drive the KPA500 to 500 watts, much fewer.  On 20 the amp needs 35 to drive it to 500.  I use a three element SteppIR  on the upper bands.  My KPA is an early version, maybe that’s the difference.  

Dale, K9VUJ



On 03, Nov 2019, at 18:33, Bob McGraw - K4TAX <rmcgraw@...> wrote:

In my case, my K3S at 35 watts will overdrive my KPA500.   In fact 19 to 22 watts produces 500 watts output on all bands.   Your 35 watts may be clean, but I doubt the KPA500 driven with 35 watts is clean.    Just my experience and measurements with my radio and amp.

73

Bob, K4TAX

On 11/3/2019 4:21 PM, dalej via Groups.Io wrote:
I should think or believe my K3/K3s is pretty clean at 35 watts into my KPA500?

Dale, K9VUJ


On 03, Nov 2019, at 13:23, Bob McGraw - K4TAX <rmcgraw@...> wrote:

The nice thing,  the K3S which contains the new synthesizers and a K3 updated with new synthesizers will be cleaner due to lower phase noise and amplitude noise.   Otherwise, lower composite noise which does and will affect any receiver.   Receiver filtering will not reduce the type of  noise which exists in the passband of the receiver.    If the transmitter is dirty, everybody suffers.   It it is fed through an amplifier, everybody suffers more.

Please read Rob Sherwood's article in QST, November 2019, pp 38 - 41.  "It's Time to Clean Up our Transmitters".   You may discover that the wonderful radio you just purchased may not be so wonderful after all. 

73

Bob, K4TAX


On 11/3/2019 11:32 AM, Wes wrote:
If TX IMD is the issue, K3 and K3S transmitters are a real mixed bag.  My old K3 at 30 watts is fantastic, with IMD at all frequencies better than -40 dBc (ARRL method).  The same radio at 10W is the worst of my two radios, except at 24 MHz where the K3 and K3S tie at -22 dBc.

It's been hard to keep up with these measurements since the KLPA3A in the K3S has been replaced twice and the KPA3A is IIRC, on the fourth version.

Wes  N7WS



On 11/3/2019 8:16 AM, Martin Sole wrote:
I suspect the quality of the transmitter particularly with regard to its composite noise spectrum to be a large player. Some radios with high end receiver performance have rudimentary (I'm being kind) transmitter composite noise performance.

See what NK7Z, NC0B and K9YC have written about this.


Martin, HS0ZED



On 03/11/2019 21:30, Mark Morin wrote:
My experience is that the type of rig does make a difference for close coexistence. We’ve found on DxPeditions that an upgraded K3 with KPA500 and a Kenwood TS-590s also with KPA500, can coexist quite well with antennas about 300 ft apart. On most bands, we can operate SSB and CW simultaneously with tolerable QRM. Other times we have tried different high-end rigs in similar setup and found that opposite end of same-band operation was nearly impossible due to QRM. I suspect it’s mostly the receivers that makes the difference. 

Mark VA2MM




Re: RS-232 to USB A cable KD8DZ

Mel Marcus
 

I have been watching this thread concerning the usb to serial cable.  I am not sure why people just don't purchase the Elecraft one.

Mel
NE9A

-------- Original Message --------
Subject: Re: [Elecraft-K3] RS-232 to USB A cable KD8DZ
From: "Steve" <99sunset@...>
Date: Sun, November 03, 2019 5:22 pm
To: Elecraft-K3@groups.io

The inexpensive Chinese 6 dollar cables use the Prolific drivers which are available for download.  The better cables use FTDI.  The difficulty using the Prolific cables and drivers is that each time Microsoft updates drivers, it will replace your Prolific drivers with FTDI and your cable will fail to operate.  Save yourself the difficulty buy just using the better cable to begin with.  These are available from Elecraft or RT Systems.  


Re: RS-232 to USB A cable KD8DZ

Michael Mickelson
 

Thanks Steve.  Several have recommended avoiding the Prolific.  I have one of the FTDI cables on order. de Mike kd8dz


On Sun, Nov 3, 2019 at 7:35 PM Steve <99sunset@...> wrote:
The inexpensive Chinese 6 dollar cables use the Prolific drivers which are available for download.  The better cables use FTDI.  The difficulty using the Prolific cables and drivers is that each time Microsoft updates drivers, it will replace your Prolific drivers with FTDI and your cable will fail to operate.  Save yourself the difficulty buy just using the better cable to begin with.  These are available from Elecraft or RT Systems.  



--
Michael Mickelson
J. Reid Anderson Professor of Physics and Astronomy, emeritus
Denison University
740-587-0687 H
740-644-1238 M
 


Re: K3S to be discontinued

Rob Sherwood
 

Hi Bill,

 

The previous quote of -40 dB PEP for third-order at 35 watts was my comparison number from Wes.  Attached K3 is at 100 watts on 20 meters, if the picture comes through.  The 3rd order is -23.7 dBc, which is 29.7  PEP.  So it is 10 dB worse.   At 12 watts, which is just the driver and no PA, I believe is “worse” than at 100 watts. 

 

I am not picking on Elecraft,  as -30 dB PEP is pretty typical today.  When any rig today (exclusive of class A or PureSignal) is so much worse than a Collins 32S-3, that is unfortunate.  The Collins measured -36.5 dBc or -42.5 PEP.  If you look at the high order products from all 13.8 volt rigs today vs. the Collins, it is pretty much night and day.  If the pictures don’t come through, please see my November QST article.

 

73, Rob, NC0B

 

From: Elecraft-K3@groups.io [mailto:Elecraft-K3@groups.io] On Behalf Of Bill K9YEQ
Sent: Sunday, November 03, 2019 5:57 PM
To: Elecraft-K3@groups.io
Subject: Re: [Elecraft-K3] K3S to be discontinued

 

“worse” seems a bit much when looking at the actual levels.  Bob, did you mean something else?  I know this is semantics….

 

73,

Bill

K9YEQ

 

https://wrj-tech.com/

 

From: Elecraft-K3@groups.io <Elecraft-K3@groups.io> On Behalf Of Rob Sherwood
Sent: Sunday, November 3, 2019 5:16 PM
To: Elecraft-K3@groups.io
Subject: Re: [Elecraft-K3] K3S to be discontinued

 

The K3S is excellent in respect to transmit composite noise.  Transmit IMD, on the other hand, is quite different at various power levels.  The sweet spot is around 35 watts, but much worse at 12 watts and 100 watts.  Here is composite noise data.  Hopefully the formatting will hold up. 

Rob, NC0B

 

Transmit Composite Noise Rig Comparisons 20 meters values in dBc/Hz

Rig @ 100 watts                2 kHz offset        10 kHz offset      20 kHz offset      100 kHz offset

K3S                                                                         -141                       n/a                         -143

FTdx-101D                           -133                       -137                       -138                       -141

IC-7851                                                                 -129                       n/a                         -138

IC-7610                                                                 -128                       -130                       -142

Flex 6400                                                             -122                       -127                       -139

IC-7300                                                                 -121                       -121                       -124

FTdx-3000                                                           -120                       n/a                         -121

TS-890S                                -116                       -119                       -127                       -139

Rig @ 30 watts                   2 kHz offset        10 kHz offset      20 kHz offset      100 kHz offset

FTdx-101D                           -129                       -134                       -135                       -137

K3S                                                                         -132                       n/a                         -140

IC-7851                                                                 -123                       n/a                         -133

IC-7610                                                                 -122                       -124                       -127

Flex 6400                                                             -120                       -125                       -137                                      

FTdx-3000                                                           -117                       n/a                         -117

TS-890S                                -112                       -115                       -124                       -135

IC-7300                                                                 -110                       -109                       -116

 

 

From: Elecraft-K3@groups.io [mailto:Elecraft-K3@groups.io] On Behalf Of Wes
Sent: Sunday, November 03, 2019 10:32 AM
To: Elecraft-K3@groups.io
Subject: Re: [Elecraft-K3] K3S to be discontinued

 

If TX IMD is the issue, K3 and K3S transmitters are a real mixed bag.  My old K3 at 30 watts is fantastic, with IMD at all frequencies better than -40 dBc (ARRL method).  The same radio at 10W is the worst of my two radios, except at 24 MHz where the K3 and K3S tie at -22 dBc.

 

It's been hard to keep up with these measurements since the KLPA3A in the K3S has been replaced twice and the KPA3A is IIRC, on the fourth version.

 

Wes  N7WS

 

 

 

On 11/3/2019 8:16 AM, Martin Sole wrote:

I suspect the quality of the transmitter particularly with regard to its composite noise spectrum to be a large player. Some radios with high end receiver performance have rudimentary (I'm being kind) transmitter composite noise performance.

See what NK7Z, NC0B and K9YC have written about this.


Martin, HS0ZED

On 03/11/2019 21:30, Mark Morin wrote:

My experience is that the type of rig does make a difference for close coexistence. We’ve found on DxPeditions that an upgraded K3 with KPA500 and a Kenwood TS-590s also with KPA500, can coexist quite well with antennas about 300 ft apart. On most bands, we can operate SSB and CW simultaneously with tolerable QRM. Other times we have tried different high-end rigs in similar setup and found that opposite end of same-band operation was nearly impossible due to QRM. I suspect it’s mostly the receivers that makes the difference. 

Mark VA2MM

 


Re: K3S to be discontinued

Bill K9YEQ
 

“worse” seems a bit much when looking at the actual levels.  Bob, did you mean something else?  I know this is semantics….

 

73,

Bill

K9YEQ

 

https://wrj-tech.com/

 

From: Elecraft-K3@groups.io <Elecraft-K3@groups.io> On Behalf Of Rob Sherwood
Sent: Sunday, November 3, 2019 5:16 PM
To: Elecraft-K3@groups.io
Subject: Re: [Elecraft-K3] K3S to be discontinued

 

The K3S is excellent in respect to transmit composite noise.  Transmit IMD, on the other hand, is quite different at various power levels.  The sweet spot is around 35 watts, but much worse at 12 watts and 100 watts.  Here is composite noise data.  Hopefully the formatting will hold up. 

Rob, NC0B

 

Transmit Composite Noise Rig Comparisons 20 meters values in dBc/Hz

Rig @ 100 watts                2 kHz offset        10 kHz offset      20 kHz offset      100 kHz offset

K3S                                                                         -141                       n/a                         -143

FTdx-101D                           -133                       -137                       -138                       -141

IC-7851                                                                 -129                       n/a                         -138

IC-7610                                                                 -128                       -130                       -142

Flex 6400                                                             -122                       -127                       -139

IC-7300                                                                 -121                       -121                       -124

FTdx-3000                                                           -120                       n/a                         -121

TS-890S                                -116                       -119                       -127                       -139

Rig @ 30 watts                   2 kHz offset        10 kHz offset      20 kHz offset      100 kHz offset

FTdx-101D                           -129                       -134                       -135                       -137

K3S                                                                         -132                       n/a                         -140

IC-7851                                                                 -123                       n/a                         -133

IC-7610                                                                 -122                       -124                       -127

Flex 6400                                                             -120                       -125                       -137                                      

FTdx-3000                                                           -117                       n/a                         -117

TS-890S                                -112                       -115                       -124                       -135

IC-7300                                                                 -110                       -109                       -116

 

 

From: Elecraft-K3@groups.io [mailto:Elecraft-K3@groups.io] On Behalf Of Wes
Sent: Sunday, November 03, 2019 10:32 AM
To: Elecraft-K3@groups.io
Subject: Re: [Elecraft-K3] K3S to be discontinued

 

If TX IMD is the issue, K3 and K3S transmitters are a real mixed bag.  My old K3 at 30 watts is fantastic, with IMD at all frequencies better than -40 dBc (ARRL method).  The same radio at 10W is the worst of my two radios, except at 24 MHz where the K3 and K3S tie at -22 dBc.

 

It's been hard to keep up with these measurements since the KLPA3A in the K3S has been replaced twice and the KPA3A is IIRC, on the fourth version.

 

Wes  N7WS

 

 

 

On 11/3/2019 8:16 AM, Martin Sole wrote:

I suspect the quality of the transmitter particularly with regard to its composite noise spectrum to be a large player. Some radios with high end receiver performance have rudimentary (I'm being kind) transmitter composite noise performance.

See what NK7Z, NC0B and K9YC have written about this.


Martin, HS0ZED

On 03/11/2019 21:30, Mark Morin wrote:

My experience is that the type of rig does make a difference for close coexistence. We’ve found on DxPeditions that an upgraded K3 with KPA500 and a Kenwood TS-590s also with KPA500, can coexist quite well with antennas about 300 ft apart. On most bands, we can operate SSB and CW simultaneously with tolerable QRM. Other times we have tried different high-end rigs in similar setup and found that opposite end of same-band operation was nearly impossible due to QRM. I suspect it’s mostly the receivers that makes the difference. 

Mark VA2MM

 


Re: RS-232 to USB A cable KD8DZ

Steve
 

The inexpensive Chinese 6 dollar cables use the Prolific drivers which are available for download.  The better cables use FTDI.  The difficulty using the Prolific cables and drivers is that each time Microsoft updates drivers, it will replace your Prolific drivers with FTDI and your cable will fail to operate.  Save yourself the difficulty buy just using the better cable to begin with.  These are available from Elecraft or RT Systems.  


Re: Dirty Transmitters

Bob McGraw - K4TAX
 

In my case, my K3S at 35 watts will overdrive my KPA500.   In fact 19 to 22 watts produces 500 watts output on all bands.   Your 35 watts may be clean, but I doubt the KPA500 driven with 35 watts is clean.    Just my experience and measurements with my radio and amp.

73

Bob, K4TAX

On 11/3/2019 4:21 PM, dalej via Groups.Io wrote:
I should think or believe my K3/K3s is pretty clean at 35 watts into my KPA500?

Dale, K9VUJ


On 03, Nov 2019, at 13:23, Bob McGraw - K4TAX <rmcgraw@...> wrote:

The nice thing,  the K3S which contains the new synthesizers and a K3 updated with new synthesizers will be cleaner due to lower phase noise and amplitude noise.   Otherwise, lower composite noise which does and will affect any receiver.   Receiver filtering will not reduce the type of  noise which exists in the passband of the receiver.    If the transmitter is dirty, everybody suffers.   It it is fed through an amplifier, everybody suffers more.

Please read Rob Sherwood's article in QST, November 2019, pp 38 - 41.  "It's Time to Clean Up our Transmitters".   You may discover that the wonderful radio you just purchased may not be so wonderful after all. 

73

Bob, K4TAX


On 11/3/2019 11:32 AM, Wes wrote:
If TX IMD is the issue, K3 and K3S transmitters are a real mixed bag.  My old K3 at 30 watts is fantastic, with IMD at all frequencies better than -40 dBc (ARRL method).  The same radio at 10W is the worst of my two radios, except at 24 MHz where the K3 and K3S tie at -22 dBc.

It's been hard to keep up with these measurements since the KLPA3A in the K3S has been replaced twice and the KPA3A is IIRC, on the fourth version.

Wes  N7WS



On 11/3/2019 8:16 AM, Martin Sole wrote:
I suspect the quality of the transmitter particularly with regard to its composite noise spectrum to be a large player. Some radios with high end receiver performance have rudimentary (I'm being kind) transmitter composite noise performance.

See what NK7Z, NC0B and K9YC have written about this.


Martin, HS0ZED



On 03/11/2019 21:30, Mark Morin wrote:
My experience is that the type of rig does make a difference for close coexistence. We’ve found on DxPeditions that an upgraded K3 with KPA500 and a Kenwood TS-590s also with KPA500, can coexist quite well with antennas about 300 ft apart. On most bands, we can operate SSB and CW simultaneously with tolerable QRM. Other times we have tried different high-end rigs in similar setup and found that opposite end of same-band operation was nearly impossible due to QRM. I suspect it’s mostly the receivers that makes the difference. 

Mark VA2MM



Re: K3S to be discontinued

Rob Sherwood
 

The K3S is excellent in respect to transmit composite noise.  Transmit IMD, on the other hand, is quite different at various power levels.  The sweet spot is around 35 watts, but much worse at 12 watts and 100 watts.  Here is composite noise data.  Hopefully the formatting will hold up. 

Rob, NC0B

 

Transmit Composite Noise Rig Comparisons 20 meters values in dBc/Hz

Rig @ 100 watts                2 kHz offset        10 kHz offset      20 kHz offset      100 kHz offset

K3S                                                                         -141                       n/a                         -143

FTdx-101D                           -133                       -137                       -138                       -141

IC-7851                                                                 -129                       n/a                         -138

IC-7610                                                                 -128                       -130                       -142

Flex 6400                                                             -122                       -127                       -139

IC-7300                                                                 -121                       -121                       -124

FTdx-3000                                                           -120                       n/a                         -121

TS-890S                                -116                       -119                       -127                       -139

Rig @ 30 watts                   2 kHz offset        10 kHz offset      20 kHz offset      100 kHz offset

FTdx-101D                           -129                       -134                       -135                       -137

K3S                                                                         -132                       n/a                         -140

IC-7851                                                                 -123                       n/a                         -133

IC-7610                                                                 -122                       -124                       -127

Flex 6400                                                             -120                       -125                       -137                                      

FTdx-3000                                                           -117                       n/a                         -117

TS-890S                                -112                       -115                       -124                       -135

IC-7300                                                                 -110                       -109                       -116

 

 

From: Elecraft-K3@groups.io [mailto:Elecraft-K3@groups.io] On Behalf Of Wes
Sent: Sunday, November 03, 2019 10:32 AM
To: Elecraft-K3@groups.io
Subject: Re: [Elecraft-K3] K3S to be discontinued

 

If TX IMD is the issue, K3 and K3S transmitters are a real mixed bag.  My old K3 at 30 watts is fantastic, with IMD at all frequencies better than -40 dBc (ARRL method).  The same radio at 10W is the worst of my two radios, except at 24 MHz where the K3 and K3S tie at -22 dBc.

 

It's been hard to keep up with these measurements since the KLPA3A in the K3S has been replaced twice and the KPA3A is IIRC, on the fourth version.

 

Wes  N7WS

 

 

 

On 11/3/2019 8:16 AM, Martin Sole wrote:

I suspect the quality of the transmitter particularly with regard to its composite noise spectrum to be a large player. Some radios with high end receiver performance have rudimentary (I'm being kind) transmitter composite noise performance.

See what NK7Z, NC0B and K9YC have written about this.


Martin, HS0ZED


On 03/11/2019 21:30, Mark Morin wrote:

My experience is that the type of rig does make a difference for close coexistence. We’ve found on DxPeditions that an upgraded K3 with KPA500 and a Kenwood TS-590s also with KPA500, can coexist quite well with antennas about 300 ft apart. On most bands, we can operate SSB and CW simultaneously with tolerable QRM. Other times we have tried different high-end rigs in similar setup and found that opposite end of same-band operation was nearly impossible due to QRM. I suspect it’s mostly the receivers that makes the difference. 

Mark VA2MM

 


Re: Dirty Transmitters

Dale, K9VUJ
 

I should think or believe my K3/K3s is pretty clean at 35 watts into my KPA500?

Dale, K9VUJ


On 03, Nov 2019, at 13:23, Bob McGraw - K4TAX <rmcgraw@...> wrote:

The nice thing,  the K3S which contains the new synthesizers and a K3 updated with new synthesizers will be cleaner due to lower phase noise and amplitude noise.   Otherwise, lower composite noise which does and will affect any receiver.   Receiver filtering will not reduce the type of  noise which exists in the passband of the receiver.    If the transmitter is dirty, everybody suffers.   It it is fed through an amplifier, everybody suffers more.

Please read Rob Sherwood's article in QST, November 2019, pp 38 - 41.  "It's Time to Clean Up our Transmitters".   You may discover that the wonderful radio you just purchased may not be so wonderful after all. 

73

Bob, K4TAX


On 11/3/2019 11:32 AM, Wes wrote:
If TX IMD is the issue, K3 and K3S transmitters are a real mixed bag.  My old K3 at 30 watts is fantastic, with IMD at all frequencies better than -40 dBc (ARRL method).  The same radio at 10W is the worst of my two radios, except at 24 MHz where the K3 and K3S tie at -22 dBc.

It's been hard to keep up with these measurements since the KLPA3A in the K3S has been replaced twice and the KPA3A is IIRC, on the fourth version.

Wes  N7WS



On 11/3/2019 8:16 AM, Martin Sole wrote:
I suspect the quality of the transmitter particularly with regard to its composite noise spectrum to be a large player. Some radios with high end receiver performance have rudimentary (I'm being kind) transmitter composite noise performance.

See what NK7Z, NC0B and K9YC have written about this.


Martin, HS0ZED



On 03/11/2019 21:30, Mark Morin wrote:
My experience is that the type of rig does make a difference for close coexistence. We’ve found on DxPeditions that an upgraded K3 with KPA500 and a Kenwood TS-590s also with KPA500, can coexist quite well with antennas about 300 ft apart. On most bands, we can operate SSB and CW simultaneously with tolerable QRM. Other times we have tried different high-end rigs in similar setup and found that opposite end of same-band operation was nearly impossible due to QRM. I suspect it’s mostly the receivers that makes the difference. 

Mark VA2MM



Dirty Transmitters

Bob McGraw - K4TAX
 

The nice thing,  the K3S which contains the new synthesizers and a K3 updated with new synthesizers will be cleaner due to lower phase noise and amplitude noise.   Otherwise, lower composite noise which does and will affect any receiver.   Receiver filtering will not reduce the type of  noise which exists in the passband of the receiver.    If the transmitter is dirty, everybody suffers.   It it is fed through an amplifier, everybody suffers more.

Please read Rob Sherwood's article in QST, November 2019, pp 38 - 41.  "It's Time to Clean Up our Transmitters".   You may discover that the wonderful radio you just purchased may not be so wonderful after all. 

73

Bob, K4TAX


On 11/3/2019 11:32 AM, Wes wrote:
If TX IMD is the issue, K3 and K3S transmitters are a real mixed bag.  My old K3 at 30 watts is fantastic, with IMD at all frequencies better than -40 dBc (ARRL method).  The same radio at 10W is the worst of my two radios, except at 24 MHz where the K3 and K3S tie at -22 dBc.

It's been hard to keep up with these measurements since the KLPA3A in the K3S has been replaced twice and the KPA3A is IIRC, on the fourth version.

Wes  N7WS



On 11/3/2019 8:16 AM, Martin Sole wrote:
I suspect the quality of the transmitter particularly with regard to its composite noise spectrum to be a large player. Some radios with high end receiver performance have rudimentary (I'm being kind) transmitter composite noise performance.

See what NK7Z, NC0B and K9YC have written about this.


Martin, HS0ZED



On 03/11/2019 21:30, Mark Morin wrote:
My experience is that the type of rig does make a difference for close coexistence. We’ve found on DxPeditions that an upgraded K3 with KPA500 and a Kenwood TS-590s also with KPA500, can coexist quite well with antennas about 300 ft apart. On most bands, we can operate SSB and CW simultaneously with tolerable QRM. Other times we have tried different high-end rigs in similar setup and found that opposite end of same-band operation was nearly impossible due to QRM. I suspect it’s mostly the receivers that makes the difference. 

Mark VA2MM


Re: K3S to be discontinued

Wes
 

If TX IMD is the issue, K3 and K3S transmitters are a real mixed bag.  My old K3 at 30 watts is fantastic, with IMD at all frequencies better than -40 dBc (ARRL method).  The same radio at 10W is the worst of my two radios, except at 24 MHz where the K3 and K3S tie at -22 dBc.

It's been hard to keep up with these measurements since the KLPA3A in the K3S has been replaced twice and the KPA3A is IIRC, on the fourth version.

Wes  N7WS



On 11/3/2019 8:16 AM, Martin Sole wrote:
I suspect the quality of the transmitter particularly with regard to its composite noise spectrum to be a large player. Some radios with high end receiver performance have rudimentary (I'm being kind) transmitter composite noise performance.

See what NK7Z, NC0B and K9YC have written about this.


Martin, HS0ZED



On 03/11/2019 21:30, Mark Morin wrote:
My experience is that the type of rig does make a difference for close coexistence. We’ve found on DxPeditions that an upgraded K3 with KPA500 and a Kenwood TS-590s also with KPA500, can coexist quite well with antennas about 300 ft apart. On most bands, we can operate SSB and CW simultaneously with tolerable QRM. Other times we have tried different high-end rigs in similar setup and found that opposite end of same-band operation was nearly impossible due to QRM. I suspect it’s mostly the receivers that makes the difference. 

Mark VA2MM


Re: K3S to be discontinued

Dale, K9VUJ
 

Hey Jim,,,

Hope all is well with you and family.  Me and cat are doing fine.  :)

I’ll be 77 in a month.  With the whole K-line and K3s too.  

I think I’ll stick with what works.  

Dale, K9VUJ



On 03, Nov 2019, at 9:51, Jim Denneny <57JNDenneny@...> wrote:

Got you all beat.  I am 84. The K3S / P3 will be my last radio. Added KPA1500 last year.

73, Jim K7EG


Re: K3S to be discontinued

Jim Denneny
 

Got you all beat.  I am 84. The K3S / P3 will be my last radio. Added KPA1500 last year.

73, Jim K7EG


Re: K3S to be discontinued

Martin Sole
 

I suspect the quality of the transmitter particularly with regard to its composite noise spectrum to be a large player. Some radios with high end receiver performance have rudimentary (I'm being kind) transmitter composite noise performance.

See what NK7Z, NC0B and K9YC have written about this.


Martin, HS0ZED



On 03/11/2019 21:30, Mark Morin wrote:
My experience is that the type of rig does make a difference for close coexistence. We’ve found on DxPeditions that an upgraded K3 with KPA500 and a Kenwood TS-590s also with KPA500, can coexist quite well with antennas about 300 ft apart. On most bands, we can operate SSB and CW simultaneously with tolerable QRM. Other times we have tried different high-end rigs in similar setup and found that opposite end of same-band operation was nearly impossible due to QRM. I suspect it’s mostly the receivers that makes the difference. 

Mark VA2MM


Join elecraft group

IU1CYF
 

Hi,
I'd like to join this group.
I own a elecraft KX3 and i love to buy a K3 or a K3S.
73 de Paolo.

IU1CYF
Eng. Paolo Nervi
Turin Italy


K3: 1 ppm TCXO calibration - Methode 3 - Data sheet missing from ELECRAFT

 

Hi Gang, Hi ELECRAFT,

I own a K3 S/N 3783.

Due to the the discontinuing of the K3 I now ordered the 1 ppm TCXO. All came in well as expected, except of one important piece of information. 
Referring to my original paper printed K3 manual Rev. D Sept. 2009 page 50 "Reference Oscillator" there are 3 methods to calibrate the TCXO.

Using the mentioned "Method 3 (1 ppm TCXO option)" the manufacture delivers a data sheet which has to be used to calibrate the 1 ppm TCXO.

But there is no data sheet delivered by ELECRAFT.....
Methode 1 und 2 are NO sophisticated ways for me to calibrate such a 1 ppm TCXO.

Two questions, please:

1. Can someone from ELECRAFT please give me an explanation on that issue?
2. Would the calibration of the 1 ppm TCXO be obsolet when installing the external reference option K3EXREF?

As ever tnx for your replies

vy 72/3 de DM5TU - OM sTef

... -.- 

 

DM5TU/VY1QRP - GQRP #8769 - DL-QRP-AG *GM* - CalQRP #034 - NAP #1607 - DM5TU @ TWITTER 

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