KSYNA board


Steve Fox
 

When I bought my K3, it came with uninstalled new KSYNA board. When I install it, what improvements should I expect to see?

73


Brian K0DTJ
 

Steve --
The install is fairly easy to do and worth it in my book.  It gives you about 7 dB improvement in LO Noise which improves TX noise and RX narrow spaced dynamic range.  Take a look at the Sherwood Receiver Test Data for a before/after comparison. http://www.sherweng.com/table.html

The main thing I noticed was an improvement in weak signal reception.  Before the mod weak CW signals would get "mushed up" in the noise and be difficult to copy.  After, the CW signal stands out much better and is easier to copy.  I imaging the same thing applies to SSB.

Here's a link to a .pdf FAQ on the subject:
https://ftp.elecraft.com/K3S/Manuals%20Downloads/KSYN3A%20FAQ-ver-D.pdf

You might also consider doing the filter capacitor mod to the KPA3 100 watt amplifier:  KPAIO3MDKT.  Turns out the improved synthesizer uncovered "... a very small amount of electrical noise associated with the fans on the KPA3 ...".  It does require some disassembly of the KPA3 and some soldering.  Not difficult though if you have the tools.  I included it in a set of updates that I applied to my K3, serial 41xx, about 4 years ago.  If you are hesitant about it, it's probably not critical to do.

Have fun!

73,
Brian, K0DTJ

On 11/20/2021 11:46, Steve Fox wrote:
When I bought my K3, it came with uninstalled new KSYNA board. When I install it, what improvements should I expect to see?

73



Dave (NK7Z)
 

Here is a real world view of the difference between two K3s, both without, and then both with the new synth.

https://www.nk7z.net/k3/

73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist, RFI
ARRL Asst. Director, NW Division, Technical Resources

On 11/20/21 14:30, Brian K0DTJ wrote:
Steve --
The install is fairly easy to do and worth it in my book.  It gives you about 7 dB improvement in LO Noise which improves TX noise and RX narrow spaced dynamic range.  Take a look at the Sherwood Receiver Test Data for a before/after comparison. http://www.sherweng.com/table.html
The main thing I noticed was an improvement in weak signal reception. Before the mod weak CW signals would get "mushed up" in the noise and be difficult to copy.  After, the CW signal stands out much better and is easier to copy.  I imaging the same thing applies to SSB.
Here's a link to a .pdf FAQ on the subject:
https://ftp.elecraft.com/K3S/Manuals%20Downloads/KSYN3A%20FAQ-ver-D.pdf
You might also consider doing the filter capacitor mod to the KPA3 100 watt amplifier:  KPAIO3MDKT.  Turns out the improved synthesizer uncovered "... a very small amount of electrical noise associated with the fans on the KPA3 ...".  It does require some disassembly of the KPA3 and some soldering.  Not difficult though if you have the tools.  I included it in a set of updates that I applied to my K3, serial 41xx, about 4 years ago.  If you are hesitant about it, it's probably not critical to do.
Have fun!
73,
Brian, K0DTJ
On 11/20/2021 11:46, Steve Fox wrote:
When I bought my K3, it came with uninstalled new KSYNA board.  When I install it, what improvements should I expect to see?

73




Steve Fox
 

Thanks. I’ll do the install in a few days. Looks easy.

Steve


Keith_WE6R <keithtrinity@...>
 

You will be able to tune down to the LowFer bands, 135 & 475Khz,  (if you also have a KBPF3A and KXV3).
Keith WE6R Elecraft K3/K4 Tech