Context: I am designing a compact RF transmitter prototype for satellite communication operating at 30 MHz (VHF band). The board will serve as a ground-station uplink module for sending telemetry and commands to a Low Earth Orbit (LEO) satellite. The design must prioritize signal integrity, frequency stability, and impedance matching. 

Core Functions:

Carrier Generation: Generate a stable 30 MHz sine wave using a crystal oscillator or PLL synthesizer.
Modulation: Support FSK (Frequency Shift Keying) or BPSK modulation for digital data input (UART/SPI interface).
Amplification: Amplify the signal to a transmit power of approximately +10 dBm to +20 dBm (10–100 mW) suitable for short-range uplink testing.
Filtering: Include a band-pass filter at the output to suppress harmonics before the antenna.
Power Management: Regulate input voltage (e.g., 5V USB or barrel jack) to clean rails for RF (3.3V/5V) and digital logic.
Power Model:

Input: 5V DC via USB-C or Barrel Jack. 
Rails:
3.3V: Low-noise LDO for the oscillator and RF front-end.
5V: For the power amplifier stage (if required by component selection).
Constraint: High PSRR (Power Supply Rejection Ratio) regulators to minimize phase noise. 
Key Constraints:

PCB Size: Maximum 80mm x 50mm (standard prototype size). 
Substrate: Standard FR4, 1.6mm thickness, 1oz copper.
Impedance: All RF traces from oscillator to antenna must be controlled to 50 Ohms.
Grounding: Solid ground plane on the bottom layer; minimize vias in the RF path.
Connector: SMA or BNC edge-mount connector for the antenna.
BOM: Prefer components available from major distributors (DigiKey/Mouser) with good stock levels. Avoid obsolete parts. 
Interfaces and I/O:

Data Input: 2-pin header or USB-UART bridge for modulation data input.
Control: 3-pin header for frequency tuning (if VCO is used) or mode selection.
Test Points: Dedicated SMA or u.FL test points for the raw oscillator output and post-amplifier output.
Power: USB-C port for power and optional data. 
RF Specific Requirements:

Component Placement: Keep the oscillator circuit compact and isolated from digital noise.
Decoupling: Aggressive decoupling strategy (100nF + 10µF) near all active RF pins.
Matching: Include a Pi-network (3 pads) between the PA and antenna connector for impedance tuning. 
Shielding: Provide footprint for a simple metal shield can over the oscillator and PA stages if space permits.
Deliverables Expected from Flux:

Schematic: Complete circuit diagram with selected components (Oscillator, Mixer/Modulator, PA, Filters, Regulators). 
BOM: Bill of Materials with Manufacturer Part Numbers (MPNs). 
Layout Guidelines: Suggested stackup and RF trace width calculations for 50-ohm impedance on FR4.
Simulation: If possible, simulate the oscillator frequency and filter response