[amsat-bb] Re: Using Preamps In Shack
kq6ea at verizon.net
Mon Mar 14 13:39:36 PDT 2011
Joe speaks wisdom when he says get a bigger one that you think you need.
I have a whole pile of those boxes in the garage because I thought they
were "big enough" for the project I had intended to build in them.
On 03/14/2011 08:13 PM, Joe Leikhim wrote:
> Check the electrical departments at Home Depot and Lowes for inexpensive
> plastic boxes made by Carlton. These are fully weatherproof boxes
> without any knockouts that are excellent for weatherproofing
> preamplifiers. You will probably need some type N bulkheads that have a
> long neck so that you can pass through the plastic plus whatever
> aluminum gauge ground plane you might want to bond your preamps to. I
> just got through rebuilding a wideband amplifier 25 MHz -1 GHz for my
> receiver, and I have a second one built at least 12 years ago for
> 240-270 MHz that although the box is pretty weathered, the electronics
> inside including a bandpass graph and notes on paper inside, look like
> new. Absolutely no water intrusion although outside for years. Get a
> bigger deeper box than you think you need. I used 6x6x5 inch boxes.
> For this one I used a Polyphazer "pickoff" to extract 15V DC from the
> coax to run a gasfet preamp and a WJ 28 dB gain T08 amplifier.
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