Commercial Geiger counters can cost hundreds of dollars. With this Geiger Counter Kit you can build your own at a fraction of the price! This easy to solder kit can be built in an evening and it works just like you think it would; clicking and blinking in the presence of radiation. Is grandma's dish collection radioactive? Do bananas give off radiation? Are your granite table tops...
- Output power 1000W pep
- All HF bands + 50MHz
- High gain
- High efficiency
- Drain voltage indicator
- Drain current indicator
- MOSFET case temperature indicator
- Forward and reverse power indicator
- Adjustable gain for 5W - 20W input power
- Using single Freescale MOSFET MRFE6VP61K25H
- Temperature controlled fan
- Reverse power protection
- Over current protection
Advances in communications in recent years have come at a startling pace. In the old days, tocommunicate via radio one needed a good antenna, a selective receiver, and a powerful transmitter.While those items are still useful, today there is one more item required: good software. The “weaksignal propagation reporter” software or WSPR (pronounced “whisper”) is one such advancedmethodology....
Beagle Bone! New from the fine people who have brought us the Beagle Board, we now have a smaller, lighter, but powerful single board linux computer, Beagle Bone! We like this move to a more compact and integrated SBC. For example, there is onboard Ethernet and USB host, as well as a USB client interface (a FTDI chip for shell access). It even comes preloaded with Angstrom Linux on the 4GB microSD...
Photo by kd1jv
80, 40, 30, 20 and 17 or 15 meter operation (17 or 15 meters selected at time of building)
DDS VFO for wide tuning range with crystal stability, 50 Hz tuning steps.
Single step or auto increment tuning
Sensitive, 0.2 uV receiver with very low internal noise for exceptional S/N ratio.
Selective CW filter with 4 crystal IF filter and audio band pass filter
The KN-Q7A single band SSB transceiver kit was designed specifically for the worldwide market by BA6BF, and kitted by BD6CR/4. As the upgraded version of the popular KN-Q7 (more than 500 kits were sold worldwide), the KN-Q7A has an improved circuit design and component selection, which makes it an ideal candidate for field operation, back pack and emergency use.
Improvements from KN-Q7
The Red Hot 40 is a high performance QRP CW transceiver kit for the 40m band. It has been designed to operate well in the presence of large out-of-band (shortwave broadcast) and in-band (contest station just down the road) unwanted signals. It should easily meet the requirements of most QRP'ers, from the most competitive contester to the casual operator.
The kit contains all the parts needed to build...
DDF2020M Radio Direction Finder kit requires minimum assembly for 10~15 Minutes
The DDF2020M DF is an economical but very sophisticated Doppler DF "kit" with a GPS input, and RS232 output to provide the ability to indicate its location and draw bearing automatically or manually on Google Earth map to find the RF transmitter more conveniently.
DDF2020M kit Includes eight assembled / tested PC boards:...