The best Side of LDMOS Amplifiers

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I´ve obtained a different FR2K-S for five months and is working extremely nicely, silent no sound whatsoever, very good QSK and excellent ATU really rapidly, I am making use of at most 1KW on CW and SSB but it surely can perform quite a bit much more. In FT8 I exploit no much more of 800W even so the temperature don’t go of fifty four deg.

Both the enter and output matching over the RF deck needed insignificant element value improvements. The schematic for that RF deck is here

The WSi/polysilicon gives a low gate obtain resistance, which is very important for the big dimension of RF electrical power units. The metal-2 gate bus functioning parallel to the gate would make periodic connections on the gate WSi/polysilicon stack to reduce the resistance. Grounded protect structures may also be used to decrease the feedback capacitance between the drain and gate and to manage the surface area electric powered fields. 

The cabinet dimensions, construction strategy, and Pretty much all the supporting elements are the identical; several of the areas did should be more strong, so Here's the changes I designed so as to build a extremely trustworthy amplifier:

And speaking of ready, There may be not much of that. From a chilly begin, it takes just 32 seconds in addition up and be wanting to transmit. After an operator error, maybe five to 10 seconds determined by just how long it will require you to determine what stupid slip-up you produced.

I really failed to plan to take a look at it at 1kw with no load, but it surely took place, and it locked out the amp similar to it had been designed to do. No destruction, even immediately after I managed to get it done once more about one hour later on.

I like if the amp is on and not in utilize it receives in rest mode, all is stopped with only the raspberry looking forward to a display screen contact, incredibly quickly frequency sensing. I like to distant controller with True VNC. I have use several amps in forty five years but this just one is the greatest for me.

I also checked Ability Genius XL but he Expense is an excessive amount of. I also checked out more mature amplifier such as the Icom PW-one applying older technology -- also excellent but only 1KW. You can see efficiency in QSK in this article: LDMOS Amplifiers Functioning from 240V in my shack, the amp temp by no means rose over 43C; Contesting CW at authorized Restrict.

The latter utilized the newest generation of units however the amp only lasted six months of sunshine responsibility prior to the finals blew. The tech admitted the devices had been improperly mounted for the factory (form of crucial at this power degree) and coated the repair below guarantee. Yet another couple of years and the finals blew once more. This time it Price tag $1100. I necessary a backup and also the RF2K-S was it. Because the Flex amp integrates seamlessly with their SmartSDR software program, I was concerned about the greater complex integration (just one needs a separate VNC plan for distant operation). But it was an unwarranted problem. I'd it functioning in lower than an hour or so. I had to question one particular Silly issue around the Discussion board and it had been answered in lower than an hour. I've been working with this to get a several months now and I'm in fact hesitant To place the facility Genius back into your program. I believe It can be my new backup. The advantage of this amp are many and they are lined in a lot of the other critiques.

I built this on a little bit of tin sheet and held it in position with a handful of the board mounting screws. Information for building this filter are about the schematic revealed later on in this article.

I used to be all excited about the “car tune” characteristic in which you can skip the “manual instructing” from the antenna tuner utilizing the controls over the amp and as an alternative use the TUNE button on your own rig. But Truthfully, I discover that “training the amp” the tuning settings is really easy, that I didn't even bother with earning the connector through the rig to the amp.

When tripped, this element will lock the amplifier in bypass method until manually reset (main power needs to be turned off for various seconds to reset it).

C. blocks. Immediately after these photos have been taken, I also changed the 22k resistor within the bias circuit having a 5k, and added a 5k thermistor in parallel with that. These elements have been extra to manage an increase in idle present since the transistor heated up on prolonged transmissions. The one other alter I can think about right this moment was the electrolytic bypass capacitor over the VDD source line ( I made use of a single 220uf aspect there).

The modest Computer system board on the warmth sink earlier mentioned and also to the best in the Manage board will be the high-temp lockout swap.