[amsat-bb] Re: Using Preamps In Shack

Joe Leikhim rhyolite at nettally.com
Mon Mar 14 13:13:49 PDT 2011

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.

Joe Leikhim

Leikhim and Associates
Communications Consultants
Oviedo, Florida


JLeikhim at Leikhim.com


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