My DDutil temperature readings are 60 degrees celcius when i run maximum power.
But to be sure I power limited my radio to 75 watts in the radio setup.
I also typically use my amp. I set my flex to like 3 watts which drives my SPE 1K to about 175 watts.
With my lousy antenna this probably works out to an ERP of like 50 watts (sigh)
On JT-65/JT-9, it is another story. It often hear the fan switch up to high after several QSO's in a row in those modes. Though the temp never seems to get excessively high.
Btw... your rack mount looks very clean, neat, and tidy.
As long as you have adequate ventilation.....
Ken - NM9P
I usually start there. If I am not heard I bump up 1 watt on the flex. At 2 watts I get 80 from the amp. Again I figure ERP is about 50 perhaps. I keep working it up as I need to.
I find when I have the amp running about 80 W that I can get to almost anything on FT-8. There are a few nodes on my antenna that I just can't overcome.
But keep in mind that JT65 and the other modes in that software are "weak signal" modes. Not "low power" modes. While it is always a great idea to use as little as possible there is nothing wrong with adding power to get the contact done.
To my knowledge the 63/65/6700 are 100% duty cycle or close to it. The P.A is designed to be able to cool under full load. That being said if you were to place the radio in a very hot room or in direct sunlight once the PA exceeds the maximum allowed temperature the radio will go into protect mode until it returns to safe temperature.The new radios have an even better cooling system because of it’s lager heat sinks and lager fans.!
This is just a few thoughts...
Flex and any other manufacture do not release info for various reasons.
One...could be sued if equipment does not perform to something they publish.
Two... could be Trade Secret....
it is not a 'Trade Secret' if you tell someone
NOTE: Rather than patents,
Trade secrets are used to protect Intellectual property
...another legal issue
Asked Coke Cola about Trade Secrets..
you know the formula to make it ;-O
like my Dad would always tell me..."You cant always get what you want"
was that the Rolling Stones
i quote the Rolling Stones some more:
And I went down to the demonstration
To get my fair share of abuse
Singing, "We're gonna vent our frustration
If we don't we're gonna blow a fifty-amp fuse"
this is just food for thought....
My testing over the last year, both at the QTH, and IOTA, and field day, is that band pass
filters and antenna match boxes (with ferrite toroids) do NOT like power. They are rated in
a B.S. Fake News term called ICAS. Study it, and puke. For example, testing revealed that
popular antenna's with 2 kilowatt match boxes could really handle about 250 to 300 watts FT8
before dangerous heating occured that can destroy the toroids in the match box.
Testing on 200 watt bandpass filters at IOTA with 80 watts FT-8 all day, melted the glue off
the coils inside the bandpass filters. The vendor, Array Solutions, sent a larger one they designed,
but then went radio silent when I mailed them a lab test report on the heating.
When the ferrite material gets too hot, the binder in the powder starts to break down.
The permeability is permanently changed. SWR will begin to climb. Time to buy a new one.
Magnetics don't like power. SSB is only about 30% duty cycle. FT-8 is keydown 100% for 15 seconds. In playing with temperature probes and dummy loads on the lab bench, your jaw will
drop at the results. So far as I can tell and test, none of the antenna match boxes and bandpass
filters on the market today have a derating specification for digital modes. And they CAN NOT
handle the rated power, if running FT-8.
User Beware. It's not your radio that will complain, it's the antenna and feedline filters and match
boxes. (This is one exmaple of many, where having a Steppir Antenna might make sense. If you can match the size of the antenna at the frequency, so that you don't need a match box with toroids, then you can really handle full legal power key down in all digital modes.)
My rotating 4-band dipole and my multi-band wire are both rated at 1500 watts. But both have
Ferrite Toroid match boxes. Experiments now have me limited to 250 watts MAX for FT-8 (After letting the purple smoke out of a few :-) )