First Assembly Steps | Ramsey Electronics QRP20 specification

"LEARN-AS-YOU-BUILD" TRANSMITTER ASSEMBLY STRATEGY:

As you can see in examining the circuit board and components, there is a bit more to this transmitter kit than soldering a few parts and putting a signal on the air. So that you don't spend extra time "troubleshooting" instead of getting on the air, we strongly recommend you follow the assembly strategy and step-by- step procedures we are providing.

Our strategy in installing parts on our PC board is to install the larger and more obvious parts such as the connectors and controls. These parts will then act as "landmarks" so that each additional device installed is seen in relationship to them, or to others previously installed.

In addition, we'll discuss the purpose of most of the components or groups of components as we go along. If you are new to the idea of building your own transmitter, perhaps our explanations will help you understand and learn as we go along. The assembly sequence will follow the circuit flow from key jack to antenna as faithfully as is practical, as part of Ramsey's "Learn-As-You-Build" kit assembly philosophy.

However, we do assume that anyone ready to construct an amateur radio transmitter has also developed some familiarity with general electronics practices and language. Therefore, you can expect the following procedures to move along with less of the hand-holding which we offer for our receivers and other kit projects in which the FCC has less interest!

FIRST ASSEMBLY STEPS:

To get started and to put some landmarks on the circuit board, we'll insert and install the 3 RCA "phono jacks", the DC power connector, the VCXO crystal selector switch, and the VXO frequency control. With these parts in place, the relative positioning of further components will become easier to recognize. Refer frequently to your parts layout diagram.

The three RCA jacks, the DC power connector and crystal switch are all "press- in-'til-flush" in design. On all three of the RCA jacks, the three large tabs are soldered to the ground plane of the circuit board, while the thin tab is for the center conductor. (Be sure these thin tabs make it into each of their respective circuit board holes!) The crystal switch has a bottom with six circuit board pins and a top with six corresponding tabs for other kinds of solder connections. Press the pin side of the switch into place as far as it will go. Press J4 into its position as far as it will go.

1. Insert and solder J1 (antenna connector)

2. Insert and solder J2 (receiver connector)

3. Insert and solder J3 (key, keyer or computer interface)

4. Insert and solder J4 (DC power +12 to 14 volts)

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QRP20 specifications

The Ramsey Electronics QRP20 is a compact and innovative low-power transceiver designed for amateur radio enthusiasts who appreciate both portability and efficiency in their operations. This QRP (low power) radio is primarily aimed at those who seek to operate on the HF bands, providing an exhilarating experience for operators who thrive on the challenges and satisfaction of making contacts with minimal power output.

One of the standout features of the QRP20 is its compact design. This radio can easily fit into a backpack, making it ideal for field operation, portable use, or emergency communication scenarios. Weighing in at just a few pounds, it’s lightweight enough for extended outings without burdening the operator.

The QRP20 operates on a range of HF bands, specifically covering 20 meters, which is especially popular among amateur radio operators for its relatively consistent propagation and activity level. The transceiver leverages solid-state technology, ensuring reliability and optimizing performance. It can produce an output of up to 5 watts, which is standard for QRP operations, allowing operators to experiment with different antenna configurations and propagation techniques.

Another significant aspect of the QRP20 is its user-friendly interface. The radio features a straightforward layout with well-placed knobs and buttons for efficient tuning and operation. The built-in digital display provides clear visibility of frequency information and operational status, enhancing the overall user experience. In addition, the QRP20 includes a narrow bandwidth filter, which effectively reduces noise and enhances signal clarity, enabling clearer communication even in crowded band conditions.

The QRP20 is equipped with an internal speaker as well as a headphone jack for private listening. It also features a built-in keyer for CW (Continuous Wave) operation, making it versatile for various modes of amateur communication including voice and Morse code.

Powering the QRP20 is effortless, as it can be run off a standard 12V power supply or a rechargeable battery, giving operators flexibility in power sourcing. Whether during portable activations or in a home setup, the QRP20 is adaptable to different operating situations.

In conclusion, the Ramsey Electronics QRP20 is a remarkable choice for amateur radio users who value portability, versatility, and performance. Its efficient design, solid technology, and ease of use make it a compelling addition to any operator's gear, offering a satisfying QRP experience while staying connected with a global community of radio enthusiasts.