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Building a 2.4GHz vertical collinear omnidirectional antenna

Demonstrates the construction of **magnetic loop antennas**, detailing both multi-turn and single-turn designs. It covers a 30-inch diameter multi-turn loop for 80 meters, based on a February 1996 QST article, and an octagon single-turn loop made from 15mm copper tube with a 4.8-meter circumference, operating from 7 MHz to 14 MHz. The document also presents a smaller 800mm diameter loop for 14 MHz to 28 MHz, emphasizing the importance of high-voltage tuning capacitors. Covers the design and construction of custom **butterfly capacitors** and piston capacitors, including a split stator capacitor with 140 pF capacitance and a 6000 Volt rating, and a butterfly capacitor with 5-65 pF and 7200 Volt rating. It explains why butterfly capacitors are preferred over split stator types for high power applications due to lower losses and direct series connection of rotors, reducing resistive losses from wiper contacts. Material recommendations include clear PVC for plates and brass or stainless steel for non-magnetic hardware. Addresses practical considerations such as feeding the loop with a shielded 1/5 Faraday loop made from RG213 or RG8 coax, achieving VSWR 1.1 across bands, and optimizing its placement 180° from the capacitor. It also discusses mechanical joint resistance, dissimilar metal oxidation prevention using Vaseline, and a simple method for determining radiation angle with a TL-light tube. The guide includes diagrams for rotor, stator, and end plate construction.

Here is a very simple 70cms dipole from Harald PD2HFE, which uses a single piece of RG-213 coaxial cable 34 cms in length.

Tips and tricks in RTTY Contesting by VA7ST

DMRconfig is a free utility for programming digital radios via USB programming cable. DMRConfig support several DMR transceivers by TYT, Baofeng, Anytone, BTECH, Zastone, Radtel.

A very useful video that explains how to program the TYT MD-2017 radio. From software download, firmware, codeplug and how to manually configure settings and how to program memories

Solutions for difficult soldering needs

TYT Electronics boasts of 15-year experience in two-way radio manufacture. Produce DMR transceivers, handhelds, receivers and mobile radios, analog amateur radio and commercial VHF transceivers

Quality Tower is dedicated to performance as a manufacturing and installiation leader by delivering high quality services in a timeframe that will meet and exceed based in Florida

DMR Contact Manager is a Free software package designed to make it easy to maintain channel, zone, contact and call group information in these radios. It is fully compatible with the Ham-Digital and RadioID database systems and allows instant codeplug updates from a wide variety of sources. DMR Contact Manager is designed for use with Connect Systems CS700/CS701/CS750/CS800/CS801/CS800D radios, as well as the Tytera MD-380/390/390GPS, TYT MD2017/MD9600, AnyTone AT-D868UV and AT-D858, Retevis RT3, and similar radios that use the RDT/RDB file formats.

TYT MD-2017 Dual-Band Analog and DMR Handheld Transceiver Reviewed by Pascal Villeneuve, VA2PV

A compleete guide to program the Tytera MD-380 DMR, installing the TYT software, setting the DMR ID and adding the contacts.

The MD-2017 is a dual band DMR and Analog handheld transceiver with a frequency range on VHF 136-174 MHz and on UHF 400-480 MHz

Download the latest firmware for the tyt md-380 VHF transceiver

How to use the hacked firmware on the MD-380. Tools for working with codeplugs and firmware of the Tytera MD380,

Modifications for Retevis RT3 / Tytera MD-380 includes Hardware Modifications, Codeplugs, Software / Firmware Modifications.

A step by step instruction on how to upgrade firmware on the Tytera MD-380 DMR

DMR Handheld TDMA Tier I and Tier II VHF or UHF product review with information on accessories

Common issue on the TYT MD-390 when the speaker start sounding like it is broken, but it depends by the external mic cover.

Collection of modifications for the Retevis RT3, a monoband handheld transceiver for DMR (digital voice) and analog FM. It is almost identical to the Tytera MD-380.

The TYT MD-2017 dual band VHF & UHF DMR portable radio review

Getting started with a fun low-cost analog/DMR radio

OpenRTX is a free and open source firmware for digital ham radios. The firmware is designed with a top-down approach with the objectives of modularity, flexibility and high performance. Currently, it targets some Tytera Radioddity Baofeng digital radios