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RF

Tracking Generator

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This is a tracking generator for the Tektronix 492 based on KE5FX's design. It takes the place of a TR-503 tracking generator but has a different architecture. The design is essentially the same as KE5FX's, but uses attenuator/amplifier pairs instead of isolators and has a different PLL circuit for generating the 110MHz LO. Read more »

SSRP

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I built a single-board version of David Carr's Simple Software Radio Peripheral.  This is a USB-connected ADC that can be used for software radio work.

SSRP board Read more »

FRC Radios

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The IFI radios are Ewave SCREAMER422 radios. They transmit at 9600 bps and have a serial RS-422 (not RS-232!) interface that runs at 19200 bps. There is documentation on Ewave's site that covers their whole range of radio modems, but it doesn't provide enough information about the SCREAMER422 to actually use it. Read more »

Software-Defined Radio

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This board downconverts and digitizes the FM broadcast band. It connects to the Digilent S3E-1600 board which selects a channel and sends the IF over Ethernet to a computer which demodulates the audio.

The sample clock is produced by a CY22150 clock synthesizer connected to J4 on the S3E-1600 board. Read more »

USB-492

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Tektronix 492 USB Interface

I have a Tektronix 492 without GPIB. This project adds USB connectivity to the Tek 492. It can download a full sweep in about 200ms. It can't read any configuration from the instrument, so it's not a real replacement for GPIB, but it would be possible to emulate the control code and duplicate the front panel controls on the computer. Read more »

Tektronix 492 First Mixer

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Mixer Diode Failure

Tektronix 492

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I bought a Tek 492 on eBay. This is a 50kHz-18GHz spectrum analyzer which was made by Tektronix in the early 1980's. There were a few major changes which can be distinguished by serial number. I have a mid-model (41000) unit made in 1981. Read more »

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