Lecture and Lab – Sep 24 2016, 10AM-3PM 40M QRP CW Transceiver


Frog Sounds HAM Radio QRP Kit Telegraph CW Transceiver Receiver Radio Station V3

Our next Lecture and Lab will be Sep 24, 2016 from 10AM – 3PM.  We will be building the Frog Sounds HAM Radio QRP Kit.

This is a very inexpensive transceiver to build and might even get you interested in “CW”. Cost for the kit will be $12.   I have 13 on order.  You may purchase the kit the day of the meeting with cash.  Please have correct change!

This continues our community builds which have allowed us to improve our kit building skills!

Here are the details on the Kit:

This is a very small volume of a simple 40 meter band micro-power amplitude telegraph transceiver, 9V square battery or external 9-12V DC power supply. Spread good time, and the nearby provinces hundreds of kilometers amateur radio communications. This machine was first introduced by domestic radio enthusiasts, but also it played a nice name “frogs”. The frogs calling Kit 3.1 public version based combined with the actual usage Fixed several key issues, after several debugging before the formation of the current version.

Key Indicators

Power supply: 9V-12V (Recommended 12V linear regulated power supply)

Antenna: 50 ohm, unbalanced

Transmission power: 2W (9V Power), 3W (12V power)

Frequency: transmitter local oscillator frequency: 7023 KHz; receive local oscillator frequency: about 7023-7026 KHz

Operating mode: CW


This machine is simple direct conversion transceiver interference, selectivity can be compared and the super heterodyne receiver, it is necessary to use not worse than the length of a half-wave dipole antenna, or communication is relatively poor. The selection disturbance is relatively small; spread the good opportunity for communication experiment, it is best to make an appointment with your friend’s communication. Communication distance of about 150-300 km more secure, to greater distance depends on the propagation environment and the operator’s operating skills. If the broadcast interference is relatively large, use 5K GAIN potentiometer signal attenuation, emergent signal from the radio interference. Attenuation potentiometer is critical, carefully adjusted; you will receive an unexpected effect. In the dissemination of good times with of this machine FT80C goods shortwave radio with a signal on a distant contrast reception, this local effect is no difference between basic commodity machine, which makes unexpected.


Dallas Medical Center

7 Medical Parkway

Farmers Branch, TX

3rd Floor Conference Room

Note:  If the kits are delayed, we will consider building and testing a small diplexer for your 2 meter / 440 MHz  measuring tape antenna.

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