Well we will watch this issue with interest. I have a Codan 9360 ex UN radio in my car and with no speech processing I get excellent reviews. If I plugged this radio into
most ham stations they would complain that it does not drive their amps the same way. The fact is that this Codan radio has a perfect splatter free transmitter that delivers rated power output. The majority of the radios that you have used use ALC as a form of compression. That is the wrong thing to do technically so your reference point for drive a radio is starting from a bad reference. You need to try a good commercial radio like the Codan and then compare the TS590S to that radio.
We find users of the K3 complaining about the same thing. The K3 does not drive their amps to the same levels blah blah blah and that the K3's compressor is not as effective as a Speech processor on brand X. They correct but only from a point of view of the radios that they used in the past were being drive incorrectly to cause a lot of splatter.If you ALC as a compressor and then use a compressor and then tie this into your power control loop you end up with a overdriven mess that hams call a well driven clean signal. However when you compare this to a commercial SSB radio its sounds like crap. The K3 drives correctly and its ALC functions correctly and its one of the reasons why the K3 sounds so clean on the air. I can only imagine how good the K3 would be with proper 50 volt FETS in its PA. It would be the cleanest radio on the ham radio planet.
Anyway we will monitor the issue with the TS590S. I can notice the power spike because I use homebrew tetrode amplifiers which is sensitive on the grid current. When I use the TS590S by itself there is no issue. There are also a lot of hams who have cranked the TS590S up to 150 watts of output. This stupidity plays makes matters even worst. We have a radio that has a poor power output control loop and we get idiots turning the power up on the TS590s in the hope that they will improve things.
Kenwood have had PA issues with most of their solid state radios. If you look at the PA designs and circuit details of all the kenwood its the same PA design in all models. All that changes is the final transistors or FETS. After the TS940S and TS950SDX all of Kenwoods smaller radios had crap splattering PA designs. The TS850S and TS870S both had transmitters that caused a lot of splatter at rated power output.
We can go on about all Kenwood and other ham companies. The fact is that they all designing poor transmitters. Then we have companies like Flexradio that produce even worst transmitters for hams. It seems the only transmitters that follow good design principles are the HPSDR radios and the K3. Both these radios need better high voltage FET PA's for improved IMD.
I have to disagree in your opinion.
Yes you are right the TS590 delivers 100 watts PEP.
Power spike issues however in the design of this radio , makes it not possible to drive it to decent compressed SSB powerlevels like other radios can, like a TS130, TS180, TS570, Hartkit 2000 (has HF clipping standard installed in the rig) , a FT847, FT817(D) FT857(D), 897(D) FT450, FT1000MP, FT920 or others.
I tried to use the high frequency clipper on the TS590 but the ALC wouldn't let me drive the rig to its potential power levels like other rigs do.
And no these radios were not overdriven and were modulated with outboard HF clippers and reached high levels of TX power in SSB and high compression levels without overdoing ALC and becoming as wide as a barndoor
I could even flip the whole PEP issue totally upside down by saying that the TS590 power can not be measured with a PEP instrument because the power spikes will tell you that it delivers 100 W PEP , and you are measuring PEP power of the spikes instead the PEP power of the actually transmitted audio.
I could be totally wrong in this way of thinking, but it could be spot on also.
I do not want to offend no one just I think it is fair to say that the TS590 has a serious SSB TX problem with power spikes.
To overcome this problem Kenwood set ALC levels such way that average power output is low in SSB.
If you do not mind the 3 dB loss fine but I think everyone should know this, before they buy this radio.
In CW it also has a power spike issue but I could solve that by turning down carrier level so low that at full CW 100 watt output it costs me 5 watts.
And no, trying to get SSB power higher by changing factory setting of menu 23 and 24 will not solve the low power problem , it will just increase the power spike problem very much.
And if you are using an amplifier , it will not be happy with these spikes getting up to 130-140 Watts.
And the spikes are very big even if you turn back the power of the radio to 25 watts there are still big spikes of say 60W that could trip a tetrode amp with protection very fast, or without protection it could damage the amplifier tubes and components.
So certainly do not try to resolve low power SSB by increasing factory menu 23 and 24 this will only give you more problems instead of less problems with the power spikes.
Lets not forget that the TS590 has excellent ears in SSB and in CW.
A big transmitter with bad ears is even worse as the 3 dB power loss in SSB.
And though you can not drive this TS590 very hard it does have very good SSB audio in TX.
Sorry to have to disagree Zenki, I certainly do not want to offend no one.
It is just time Kenwood got their act together and solve the power spike issue in the TS590 instead of trying to cover it up with a band aid.
But as far of getting their acts together Icom, Flex radio, Kenwood and Yaesu have enough to do because all these IF based DSP or SDR based radios have plenty of problems to solve with the quality of their 12V RF amps in getting the transmitted SSB signal cleaner, so the very good SSB RX in radios like K3, TS590, TS990, IC7700, IC7800, FTDX3000, FTDX5000, TENTEC Orion2, several SDR based radios, can be used to their full potential and will not be suffering from very poor quality transmitted SSB signals as wide as a barndoor.
It could have something to do with use of quality design and components and good engineering instead of building as much bells and whistles in to their radios to sell them as many as possible as expensive as possible.
And of-course these commercial companies are reaching their goal, their products do not have to be good, their goal is to make money on them as much as they can.
The money loaded hams are there to make sure they will keep selling them.
And of-course lots of hams should try to reduce the drive levels of their SSB TX so the transmitted signal of these radios stay clean and within reasonable bandwith.
Listening to the east European contest stations with huge amplifiers up to 10KW in weekends, I know what overdriving all ALC levels does with a transmitted SSB signal in effect to bandwith.
Living in the first hop area of Italy, LZ, UA, EA, YO, LY etc. I do know the results of a totally overdriven SSB signal with an up to 10KW power amp. into a 6 element monoband yagi or even stacked Yagis. The result is that these transmitted SSB signals that are up to 15 or even 20 KC wide.
They could inform at PA0CHN in how he got his radio the Hartkit 2000 build so good that it still outperforms these radios in both TX and RX quality.
It took Kenwood and Yaesu and Icom the lesson of the Elekraft K3 to find out that they can be beaten.