LDMOS Amplifiers for Dummies
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The crucial element parameters for LDMOS are not just the DC parameters, like on-resistance and the most existing functionality, but in addition the output, enter, and feed-back capacitances. The output capacitance is essential for the frequency-dependent losses and the bandwidth of the facility amplifier.
If you'd like to go the Entrance Panel Specific way, a block diagram in the amplifier, and my layout information with the panels talked about higher than are available In this particular folder.
The next amplifier on the proper makes use of two 1kw RF decks with a combiner, a larger heat sink and a far more ruggedized LPF. This 1 is effective at 1500w in all modes, including the extra demanding electronic modes (JT65 and others) used for EME.
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I happen to be subsequent the RF-Package team io e-mail for more than two decades. There were always conversations that terrified me, as I didn’t even understand what These acronyms intended, Except I seemed them up. And in some cases then, I had been pretty much continue to at midnight. I'm a CW man. I exploit QSK. That by itself enormously restricted my choice of possibilities. I use an Icom 7610.
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The original review underneath remains to be true. This amp has long been in LDMOS Amplifiers services as being a REMOTE amp for an all band station. It has never failed to deliver.
I phoned John at Island amplifer a couple of days in the past in order to thank him and let him understand how pleased I'm Together with the RF2K-S, I am updating this analysis since it proceeds to work beyond expectations.
There is a small bracket holding the LED bar graph meters set up about the front panel, mounted in a way that avoids needing to drill mounting holes in to the panel.
SWR Security stops amplifier injury if you switch to some Improper band, use the wrong antenna or have a substantial SWR. More than-electrical power defense enables if output ahead electrical power or mirrored electrical power exceeds a safe stage.
The attenuator is out in the bypass path, and is only in-circuit following the enter antenna change, and routed throughout the input jumpers into the amplifier board.
The package of elements arrived with two pieces of ten ohm coax, and one piece of fifty ohm .250 semi-rigid to the output baluns/matching transformers. I make point out of this because, as provided within the package, these coax items were a few cm lengthier compared to the short article specified. I pondered this, and made the decision never to trim them shorter, reasoning that at LDMOS Amplifiers 2m, it would not make a difference A great deal. It didn't, but right after inquiring Yet another builder relating to this (F5BQP), who was form adequate to mail me information on trimming them (revealed at correct), I went back again afterwards and trimmed them to spec just to be particular I was not lacking anything at all In fact.
The little Laptop board on the warmth sink earlier mentioned and also to the ideal of your Command board will be the high-temp lockout switch.