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Author Topic: Can you tell me what this is? See pictures.  (Read 2753 times)
W4JST
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« on: November 17, 2012, 05:29:50 PM »

Can anyone tell what this is? Any specs?

http://i47.tinypic.com/28s4j2g.jpg


http://i50.tinypic.com/2ihbi2b.jpg


http://i50.tinypic.com/zukvme.jpg
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KQ6EA
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« Reply #1 on: November 17, 2012, 08:14:09 PM »

It looks like a Down East Microwave receive-only preamp that somebody painted black.

73, Jim
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K2OWK
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« Reply #2 on: November 17, 2012, 09:27:11 PM »

I agree it looks like a receiver pre-amp for microwave receiver, possibly for a commercial satellite receiver. 3.8/4.2 GHZ.

73s

K2OWK
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KQ6EA
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« Reply #3 on: November 17, 2012, 09:42:05 PM »

It looks an awful lot like the several DEMI preamps I've built.
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W4JST
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« Reply #4 on: November 18, 2012, 03:39:19 PM »

Thanks everyone.

So DEMI.

Receive only, can't transmit through it?

Any indication of frequency?
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KQ6EA
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« Reply #5 on: November 18, 2012, 05:33:46 PM »

Yes, receive ONLY.

You'd need a bypass (DPDT) relay that was RF sensed to switch it out of the circuit when it detected you transmitting.

I'll take a SWAG and say either UHF or 'broadband', like 100~1000MHz.

Send the pix to DEMI and see if they know. It could be a knock-off or homebrew, but all of the DEMI preamps I've built have the same connectors, mounted the same way, in the same enclosure, with a feedthrough cap for the DC input.

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W4JST
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« Reply #6 on: November 20, 2012, 07:19:42 AM »

Thanks.  I contact DEMI and they said it is NOT their preamp but is a W6PO design possibly made by Michigan Microwave or a knock off. He guessed it was a 23cm LNA 1240-1300 MHz. Can anyone confirm or send me pics of a Michigan Microwave 23cm LNA?
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N1CX
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« Reply #7 on: November 20, 2012, 02:01:37 PM »

It looks like an old Spectrum preamp.

Is spectrum still in business?
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