概要

These waveguide bandwidth harmonic mixers are designed for use with spectrum analzyers with diplexers, such as the Tektronix 492 and 494 and the Hewlett-Packard 8555A, 8565A and 8569A.  They are also used as phase locking and receiver mixers for antenna measurement systems such as the Scientific Atlanta wide range receivers.  When used with an external diplexer*, these harmonic mixers can be used to phase lock millimeter wave sources.
The mixer contains a rugged stripline mounted silicon beam-lead Schottky barrier diode (Models FM and DM use a GaAs diode).  The small physical dimensions of these mixers make them ideal for use in lightweight, compact equipment.  Two diode, balanced harmonic mixers optimized for even or odd harmonic mixing are also available.  Consult factory.

MODEL	FREQUENCY (GHz)	Minimum detectable signal (in 1 KHz bandwidth)**	WAVEGUIDE	FLANGE COMPATIBILITY	Dimensions (excluding SMA female connector, inches
KM	18-26.5	-95 dBm	WR-42	UG-595
KaM	26.5-40	-85 dBm	WR-28	UG-599
QM	33-50	-80 dBm	WR-22	UG-383
UM	40-60	-78 dBm	WR-19	UG383 (MOD)
VM	50-75	-75 dBm	WR-15	UG-385
EM	60-90	-72 dBm	WR-12	UG-387
WM	75-110	-70 dBm	WR-10	UG387 (MOD)
FM	90-140	-68 dBm	WR-8	UG387 (MOD)
DM	110-170	-64 dBm	WR-6	UG387 (MOD)

*LO/IF diplexers are available for IF & LO ranges shown below:

Diplexer model #            IF range                LO range                         Diplexer Outline Drawing
 MD1A                             DC-1 GHz             1.8-7.5 GHz
 MD2A                             DC-1 GHz             5-20 GHz
 MD4A                             DC-2.5 GHz          5-20 GHz

**Minimum detectable signal measured with Tektronix 492 or 494 Spectrum Analyzer
LO and IF frequencies to 18 GHz
LO power requirement +15 dBm maximum, +6 dBm typical
Total RF + LO power input 100 milliwatts maximum
Bias requirements:  See application note MIXER DIPLEXER AND DIODE BIAS.  Typically operates self biased with DC return to ground.
For recommended self bias circuit for models  FM and DM,  see application note SELF BIAS CIRCUIT FOR GaAs DIODE MIXERS.