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Opinion of use of a part for replacement

I have a component - part number - NE76038 - made by "NEC". I bought it with the "slight" hope it can replace a part I was told is unavailable. The part it is replacing is a GaAs Fet RF amp from a Pre-amp operating in the 144 MHz band (experimentally).

The original part was smoked - and I am "trying" to repair the pre-amp - there isn't much to it - being the (GaAs Fet RF amp is pretty much the heart of it.

The paperwork I have shows it as a "minimum" frequency of .5 GHz. These were not too bad price wise, so if not able to be used for that - I'm sure I can find more appropriate uses for them - being I do homebrew.

THIS part is the closest I've seen to what I need to replace. I don't have the exact part number needing to be replaced, but again - it "IS" a GaAs Fet in a "receive" preamp in the 144 MHz range. So, I'm asking your opinion (those who may be familiar with this device) - will it bow down that low and do a decent job? The original part has a 20 dB gain. This boasts -> 21.67 dB at .5 GHz. 13 dB gain at 4 Ghz. 7.5 dB at 12 GHz. It "states" best for 2nd or 3rd stage RF or DC Amplification. This preamp is single stage.

If need be, I can pull up the part number actually needed - but have to do some digging to do so.

I know I could just plug this thing in and "try" it, but I have to dig it out too - so I could probably have an answer here - a hell of a lot faster.

Thanks in advance. IF this is able to do the job, then I've now got a handful of replacements to keep this thing going for a long time. If not - as I said, I'll do some homebrewing - no big deal.

L.

Reply to
L.
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There doesn't seem to be much to stop you trying it. The curves on the datasheet

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(free access and you don't need to register) show gain and noise down to 100MHz so it should do well but watch out for the very high gain at 2 M. Do you have a top/bottom screening plate across the source pins?

HTH

73 de G3VPC

-- Graham W

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Reply to
Graham W

You might look this over:

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it's a preamp kit with complete instructions. Uses a cheaper xistor I suspect.

Reply to
Ancient_Hacker

You might look this over:

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it's a preamp kit with complete instructions. Uses a cheaper xistor I suspect.

Or you could try

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search for "low noise transistor". Several hits.

Reply to
Ancient_Hacker

Thanks, I'll have to check that out. IF it does work - I may even create a couple other preamps - since there really isn't much to this thing.

Top and bottom plate - you lost me! Without looking at the preamp - all I can tell you is the Transistor is soldered to the appropriate tabs provided for it and they in turn go to the other components as needed. The design is pretty well laid out - only there is a "shield" with a hole to allow interstage connections. The Shield separating the sections as needed.

L.

Reply to
L.

Thanks, will check that out as well.

L.

Reply to
L.

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