Hello everyone,
I am using coaxial ferrite transformer for two years in my "wideband" power amplifier (MPN SD2931-10 / approx. 70-170 MHz / P1dB 200W).
I was only following application note but now, I am looking to understand further.
To do that, I plane to use QUCS to simulate. First, I need to write some specs:
Hybrid combiner at working frequency 1.8-50 MHz with power approx 1000W.
Equivalent commercial product can be founded on ethernet with key word "1.8 to 60MHz 2.5KW Hybrid Splitter/Combiner Set".
Material ferrite will be 31 or/and 43.
I am planing to realise the hybrid transformer of the figure 8 or 11 of the attach application note (Motorola AN-749).
To begin, I want to get a good model of a transformer that I can confirm with VNA measure.
I have bought some Fair-Rite 5943003801 and I plane to use 50R semi-rigid coaxial around it.
So, below, the first simulation
For TR1, threes parameters need to be define: Lpri, Lsec, K and L1.
The problem is how can I know this 4 parameters?
Have you already done similar simulation?
I am using coaxial ferrite transformer for two years in my "wideband" power amplifier (MPN SD2931-10 / approx. 70-170 MHz / P1dB 200W).
I was only following application note but now, I am looking to understand further.
To do that, I plane to use QUCS to simulate. First, I need to write some specs:
Hybrid combiner at working frequency 1.8-50 MHz with power approx 1000W.
Equivalent commercial product can be founded on ethernet with key word "1.8 to 60MHz 2.5KW Hybrid Splitter/Combiner Set".
Material ferrite will be 31 or/and 43.
I am planing to realise the hybrid transformer of the figure 8 or 11 of the attach application note (Motorola AN-749).
To begin, I want to get a good model of a transformer that I can confirm with VNA measure.
I have bought some Fair-Rite 5943003801 and I plane to use 50R semi-rigid coaxial around it.
So, below, the first simulation
For TR1, threes parameters need to be define: Lpri, Lsec, K and L1.
The problem is how can I know this 4 parameters?
Have you already done similar simulation?
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