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HF BPF Builders – Circuit Schematic
HF BPF Builders
This kit is a daughter board, designed by Jan G0BBL and Tony KB9YIG, that provides four electronically switched band-pass filters for the Softrock Lite + Xtall ...
GenesisRadio Transceivers – Circuit Schematic
GenesisRadio Transceivers
Later, I will use the same pivot table to list the parts out by each of the 8 phases in the build, organizing them into phase-specific bags O` parts. First thin...
Ensemble RX Builders – Circuit Schematic
Ensemble RX Builders
This kit is the earlier, now retired Ensemble RX version. These instructions are provided for those who possess and might have delayed building that version of ...
Ensemble II VHF RX qsd – Circuit Schematic
Ensemble II VHF RX qsd
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Ensemble II VHF RX rf – Circuit Schematic
Ensemble II VHF RX rf
This stage begins at the VHF antenna. The incoming VHF RF signal is preamplified and filtered and presented as the "RF" signal to the ADE + Double Balanced Mixe...
Ensemble II VHF RX div – Circuit Schematic
Ensemble II VHF RX div
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Ensemble II VHF RX – Circuit Schematic
Ensemble II VHF RX
Replacing the front-end with a circuit that down-converts VHF signals in the 2m, 4m or 6m bands to HF signals that can be received in the RX`s "back-end" (which...
Ensemble RXTX Builders 2 – Circuit Schematic
Ensemble RXTX Builders 2
This stage adds the TX Mixer to the board and provides the modulation of the Dividers` output signals by the 4 I and Q signals from the TX OpAmps (Quadrature Sa...
Ensemble RXTX Builders 1 – Circuit Schematic
Ensemble RXTX Builders 1
The mixer stage ("QSD" - Quadrature Sampling Detector) acts like two traditional direct conversion mixers operating in tandem. Each takes in half of the filtere...
Softrock Lite USB Xtall – Circuit Schematic
Softrock Lite USB Xtall
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Stage VI Mixer – Circuit Schematic
Stage VI Mixer
In the "DSP" tab`s "Local Oscillator" section, click on the button marked "Single Band" and type in the desired center frequency (7046000). This sets Rocky`s ce...
RXTX V6.3 TX Mixer – Circuit Schematic
RXTX V6.3 TX Mixer
TX OpAmps TX Mixer (QSE) PTT RX Switching PA/Filters External Connectons Comments Revisions WB5RVZ SDR Home This stage adds the TX Mixer to the board and provid...
SR Lite RX V6.2 40/30m Builders – Circuit Schematic
SR Lite RX V6.2 40/30m Builders
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FM Transmission and Reception – Circuit Schematic
FM Transmission and Reception
The original f-m transmitters manufactured by the General Electric Company were the direct f-m type employing the regular electronic automatic frequency control...
Regency ATC-1 Converter – Circuit Schematic
Regency ATC-1 Converter
The 1956 Regency ATC-1 converter heralded the dawn of a new era for amateur radio. The little converter had only two transistors - one PNP, one NPN, both german...
VHF Stability – Circuit Schematic
VHF Stability
The intelligent discussion of VHF systems requires a feel for VHF systems, and how VHF energy moves through a system. At VHF, wavelength is very short. Waveleng...
Small Magnetic Receiving Loops – Circuit Schematic
Small Magnetic Receiving Loops
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antenna tuner circuits – Circuit Schematic
antenna tuner circuits
The Johnson 275 watt and Kilowatt Matchboxes are both unnecessarily exaggerated and unnecessarily maligned. They are not exceptional tuners, and are not poor de...
A Push-Pull Hartley VFO transmitter – Circuit Schematic
A Push-Pull Hartley VFO transmitter
This is a variation of the the Electron Coupled Oscillator circuit, pioneered by Dow in 1931. Dow`s ECO has the screen "grounded" for RF. In this circuit, becau...
single-813 crystal oscillator transmitter – Circuit Schematic
single-813 crystal oscillator transmitter
Here is the single- 813 crystal oscillator transmitter, designed by RCA and exhibited in their advertisement on the back page of a "QST" magazine in 1938, and p...