1000 watts output
100 watts output
25 watts output
6.25 watts output
1.56 watts output
.39 watts output

start at the proverbial "30 db. over S-9" and work itself down to S-1 for reasons that will become obvious.

S9+10 db.

S9

S8

S7

S6

S5

We can see that it becomes easy to play games with such numbers. For example, an RST of 439 is a legitimate report which permits reasonably effective communication. But, do we believe that the transmitting station illustrated above could really produce a 439 signal by running .0013 watt? If we say "probably not", we also ask why not, and then we would get the seminars about perfect antenna matching, transmission line losses, and so forth.

Under good propagation conditions, SSB signal reports of "20 over S-9" and more can be given without even needing 1000 watts or a beam antenna. Assuming the "+20" is an accurate report, consider this example of power reduction over the same path:

S9+20db.

1000 watts

S9+10db.

100 watts

S9

10 watts

S8

2.5 watts

S7

.625 watts

S6

.156 watt

S5

.039 watt

S4

.0087 watt!

Under reasonably good band conditions, particularly at 10 or 14 MHz and on up, the above correlation of signal reports to power output becomes realistic. "S9+20" is what amplifier users expect to give and receive to justify their investment and power consumption. Most commercial transceivers have typical output in the 60-200 watt range, and S8-9 reports are taken for granted. Actually, 15-25 watts is a far more practical operating power than most amateurs and equipment vendors realize today...and the thousands of QRP enthusiasts will confirm that getting a solid 579 running 3-4 watts is no big deal.

If all the above theoretical signal reports are based on both the transmitting and receiving stations using simple dipole antennas, we can also see that the use of some 10db gain antenna such as a beam or quad by either station could move the S7 for .625 watt up to S8, and that a similar antenna used at the other station could give the under 1 watt signal a further boost over S9!

QRP-20 • 6

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Ramsey Electronics QRP20 manual QRP-20
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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.
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