What has Kenwood said about this issue? When I dial in 1ms of delay, it goes away. Can you tell the difference between 0 & 1ms or is it just the principle of the thing?
There must be more radios with the same QSK behaviour and I still hope to find the solution here in the TS890s group. If not, I have to contact Kenwood.
I passed my question to JVC Kenwood in Japan. Here is the answer: QUOTE “About TS-890S CW Full BK attack noise. The cause of this problem is the pulse noise generated by switching TX-> RX. Especially, the 270Hz Roofing Filter has a long delay time, so the problem was remarkable, so we optimized the time to delay the rise of the received signal. It is also optimized for the 500Hz Roofing Filter, but some noise may remain. To solve this problem alone, you may be able to eliminate the noise by extending the delay time further, but CW Full break in delays the time to return from transmission to reception. This undermines the practicality of CW Full break in. The result of optimizing these balances is the improvement by Ver.1.03. If you connect a radio to the antenna, the noise may be buried, so it is the current specification.” UNQUOTE
That means: If you want to avoid this QSK Bang, then you should not use Full-BK (QSK) but Semi-BK with a time delay. My TS890s was bought July 2021 and is using Ver. 1.03 already, so there is not much hope for me to run QSK without that noise… what a pity! 73s Rudi
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I'm late to this discussion, but have you tried backing off the RF gain a bit?
Hi Victor,
yes, I reduced the RF gain and it gets better.
73s Rudi DK7PE
What has Kenwood said about this issue? When I dial in 1ms of delay, it goes away. Can you tell the difference between 0 & 1ms or is it just the principle of the thing?
There must be more radios with the same QSK behaviour and I still hope to find the solution here in the TS890s group. If not, I have to contact Kenwood.
I passed my question to JVC Kenwood in Japan.
Here is the answer:
QUOTE
“About TS-890S CW Full BK attack noise. The cause of this problem is the pulse noise generated by switching TX-> RX.
Especially, the 270Hz Roofing Filter has a long delay time, so the problem was remarkable, so we optimized the time to delay the rise of the received signal.
It is also optimized for the 500Hz Roofing Filter, but some noise may remain.
To solve this problem alone, you may be able to eliminate the noise by extending the delay time further, but CW Full break in delays the time to return from transmission to reception.
This undermines the practicality of CW Full break in.
The result of optimizing these balances is the improvement by Ver.1.03.
If you connect a radio to the antenna, the noise may be buried, so it is the current specification.”
UNQUOTE
That means: If you want to avoid this QSK Bang, then you should not use Full-BK (QSK) but Semi-BK with a time delay. My TS890s was bought July 2021 and is using Ver. 1.03 already, so there is not much hope for me to run QSK without that noise… what a pity!
73s Rudi