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150MHz to 170MHz in 25kHz steps using a LMX2306 PLL – Circuit Schematic
150MHz to 170MHz in 25kHz steps using a LMX2306 PLL
Using SimPLL`s new PLL Wizard you can design a new PLL with a few clicks of the mouse. We have just designed one that tunes from 150MHz to 170MHz in 25kHz steps...
FTdx-5000 – Circuit Schematic
FTdx-5000
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Dodd Station – Circuit Schematic
Dodd Station
Fortunately, Dodd`s 1909 receiver has survived. It was found among the many parts that were in various boxes that I had purchased at the yard sale. The pieces w...
SWR Protection Circuit – Circuit Schematic
SWR Protection Circuit
This scheme is an SWR meter, which is quite simple and easily built. Once you make a directional coupler, the results will be displayed with the measure led met...
valve radio circuits schematics – Circuit Schematic
valve radio circuits schematics
Build a library of circuits and service data for old valve and transistor radios. There are many available on the internet, but at a price. I would rather share...
Transmitter Phone FM Transmitter – Circuit Schematic
Transmitter Phone FM Transmitter
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Micro Spy Transmitter – Circuit Schematic
Micro Spy Transmitter
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FM Transmitter Circuits and Schematics – Circuit Schematic
FM Transmitter Circuits and Schematics
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Spy Transmitter Circuit – Circuit Schematic
Spy Transmitter Circuit
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Spy FM Transmitter Circuit – Circuit Schematic
Spy FM Transmitter Circuit
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FM Transmitter – Circuit Schematic
FM Transmitter
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FM Spy Transmitter Low Powered – Circuit Schematic
FM Spy Transmitter Low Powered
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FM Crystal Controlled Transmitter DPT – Circuit Schematic
FM Crystal Controlled Transmitter DPT
The DPT Transmitter is a dual powered Voice Transmitter that came about from quite a few request for a transmitter that would function both at power when long r...
Crystal Controlled FM Transmitter Circuit – Circuit Schematic
Crystal Controlled FM Transmitter Circuit
This circuit operate between 150 to 165 Mhz. The Crystals I use Are The Digi-Key Electronics Barrel Crystals CA-301 Type which cost a couple of bucks per crysta...
Spy FM Transmitter – Circuit Schematic
Spy FM Transmitter
Build this circuit using a Digi-Key Electronics Barrel Crystal (CA-301), 15 Mhz for a standard output frequency of 150. 00 Mhz. If you want to customize the fre...
WIDEBAND ACTIVE RECEIVING ANTENNA – Circuit Schematic
WIDEBAND ACTIVE RECEIVING ANTENNA
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An experiment in programming the AN6311NFA PLL – Circuit Schematic
An experiment in programming the AN6311NFA PLL
The goal was to convert this radio for operation on the 70cm amateur radio band. This was unsuccessful as the VCO will not oscillate at the right frequencies fo...
I and Q Phasing – Circuit Schematic
I and Q Phasing
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Beacon Transceiver Project – Circuit Schematic
Beacon Transceiver Project
DDS VFOs work very well with single conversion SSB radios such as the Codan 6801, 6924, 7727 and 8121, and the AWA Teleradio 110H. See the Recycled Radios page ...
Precision QRP Transmitter – Circuit Schematic
Precision QRP Transmitter
This little transmitter is suitable for less demanding Doppler propagation measurements. It is designed for use on 80m, but can be easily adapted for 40m or 20m...