KF5UUP StellaCat Doublet – v25-9-001

Table of Contents

1. System Diagram
2. Overview
3. Core Specifications
4. Expected Band Performance
5. Design Philosophy
6. Advantages
7. Construction & Deployment
8. Target Audience
9. Example Setup
10. Revision Information
11. License

Portable Multiband HF Antenna Platform

The StellaCat project is a lightweight experimental portable HF antenna platform focused on balanced operation, low-noise reception, multiband flexibility, and fast field deployment.

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Overview

The KF5UUP StellaCat Doublet – v25-9-001 is a compact portable HF antenna system using:

• 25 foot balanced doublet radiator
• 9 foot balanced feed section
• 4:1 balun interface
• tuner-assisted multiband operation
• inverted-V deployment geometry

The antenna is optimized for approximately 25 watts portable operation.

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Core Specifications

Parameter	Specification
Designation	KF5UUP StellaCat Doublet – v25-9-001
Overall Length	25 ft
Feedline Length	9 ft balanced line
Feedpoint Transformer	4:1 Balun
Configuration	Inverted-V
Recommended Power	25W
Intended Use	Portable HF Multiband

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Expected Band Performance

Band	Expected Behavior
40m	Usable regional operation
30m	Good performance
20m	Excellent
17m	Excellent
15m	Very good
12m	Good
10m	Excellent

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Design Philosophy

The StellaCat antenna platform emphasizes:

• Practical field deployment
• Balanced low-noise operation
• Compact transportability
• Multiband tuner flexibility
• Lightweight portable architecture

rather than strict single-band resonance optimization.

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Advantages

• Reduced common-mode noise
• Broad multiband usability
• Lightweight portable deployment
• Balanced feed architecture
• Efficient operation under high SWR conditions

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Construction & Deployment

1. Attach the 25-foot balanced doublet radiator to the feedline.
2. Connect the 9-foot open-wire feedline to the 4:1 Balun.
3. Link the Balun output to your transceiver or antenna tuner via coax.
4. Deploy the antenna in an inverted-V configuration for optimal performance.
5. Adjust for multiband operation with an antenna tuner.

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Target Audience

This platform is ideal for:

• Amateur radio operators seeking lightweight, portable HF antennas
• Field operators who value speed in deployment
• Hobbyists interested in multiband antenna versatility

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Example Setup

Example 1: Field Deployment

A quick field setup example:

• Location: Open field with available tall supports
• Steps:
  1. Erect two vertical supports (e.g., masts or trees) 25 feet apart.
  2. Suspend the 25-foot doublet horizontally, forming an inverted-V with the feedline.
  3. Connect and configure using the system diagram.

Include any image or video demonstrations for users.

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Revision Information

Revision	Description
v25-9-001	Initial 25 foot radiator with 9 foot balanced feedline

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License

Experimental amateur radio project documentation.