Miscellaneous Equipment




1N21C mixer assembly.   BNC connectors for RF, LO & IF.  Internal pad on the oscillator input.  DC bias feed to diode.   Nicely machined assembly 1.75" x 1.5" x 1" exclusive of connectors.   $20

5 Volt, 4 Amp, protection circuit -- The input via a small 4 turn coil, connects to a spark gap, with a small bulk resistor in parallel, then to a 2uH choke, an 11 volt MOV to ground, another 2uH choke, a large 5 Volt transorb with a small ceramic cap in parallel to ground and finally another small coil to the output.   All mounted on a 1" x 1-1/2" metal base.   Someone wasn't taking any chances!   NOS -- $2 ea.

Avantek GaAs Fet Preamp SD7-0738N 3.7-4.2 Ghz.   WR-229 input flange.  N output connector.   4 pin AN type power connector -- pin assignments noted on label.  Used -- $25

Rantec FU-301 Microwave device This is some kind of filter or delay line?? at some GHz ...I don't know.   N connectors -- 7 3/4" x 3 3/4" x 1" overall. -- $10

Hughes M-band balanced mixer assemblies which have WR-75 flanges on the RF & Oscillator inputs and wire terminals on the IF outputs.   $20 ea

IBM Model 75 Selectric typewriter --
Rare transistional electronic 96 character model, circa 1980, in IBM blue with mechanical keyboard (feels like a Selectric II) and electronic 7500 character (26 documents + 99 phrases) memory.   Good condition, types, but needs a bit of TLC (new ribbons, oil?) as it has been stored (indoors, clean & dry) for the last 30 years.   $150