1. HELL-FEST (The contest from Hell) - https://hellfest.digital/rules/
Multipliers: QRP<=10W is a x3 multiplier
2. Digirig Mobile Rev 1.9 (інтерфейс цифрових режимів для радіолюбителів) - https://digirig.net/digirig-mobile-rev-1-9/
3. Capture the Magic of Six Meters — електронна книга версії 2.0 - https://k5nd.net/capture-the-magic-of-six-meters-ebook/
4. 4XFF program awards - https://wwff.co/2023/09/4xff-program-awards/
** WWFF: Statistics August Activity Month 2023 - https://wwff.co/2023/09/statistics-august-activity-month-2023/
5. PMR-171 SDR HF VHF UHF Transceiver - https://www.dxzone.com/pmr-171-sdr-hf-vhf-uhf-transceiver/
