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A DBM specified up to 1OOOM Hz (with modest specification) proved useless at 1300MHz when tested by ~h e autho r. An interesting alternative to the classica l DBM approach is to use a single unbiased MOSFET 39 Microwave Projects Fig 4: Using a MOS-FET as a balanced mixer. ---1 ~ 810 2 RFC LO 1152 MHz as a balanced mixer (Fig 4), then no phasing arrangemen t is needed. In this circuit the MOSFET functions as a switch operated by the LO signal, just like the diodes in Fig 2. The task is to find a MOSFET with low turn on resistance and without diode protection on the gate.

37, pp, 46, 48, 54 [4] Simple Direct-conve rsion VHF transmitter-receive r F1BBU , Megahertz 7/2000, 2/200 1, Radio-REF 4/200 1, 6/200 1 (sold as kit: see REF-Union shop) [5] Whats phasing-system SSB? Uncle Oscars notebooks, Megahertz 7/2000 [6] Direct Conversion Prepares for Cellular Prime Time, Patrick Mannion, Electronic Design, 11/1999 . Mashour, W. org 36 Chapter 2 Transverters In this chapter : • Building blocks for a 23cm transve rter • 1OGHz Transverter from Surplus Qualcomm OmniTracks Units • A "building block" 5750MHz transverter design here are many kits and ready-made transverters available to the radio amateur who wants to operate on the microwave bands.

The Avantek power amplifier is of a type commonly found at Hamfests and is powered by . -24VDC during transmit only. Typically, T/R relays do not provide enough isolation, so leaving a high gain power amplifier biased during receive can significantly raise the noise floor of the receiver , thereby swamping out the desired signal. Power Amplifiers such as the one used in this transverte r put out around 10 Watts when driven with between 3 and +3dBm. The Transmit/Receive Relay is also of a type commonly found at Hamfests.

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