[amsat-bb] Re: Using Preamps In Shack

Joe Leikhim rhyolite at nettally.com
Mon Mar 14 15:17:19 PDT 2011

Bring the parts, cables plus connectors to the store when shopping. The 
biggest problem is cable bend radius.

On 3/14/2011 4:39 PM, Jim Jerzycke wrote:
> 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.
> 73, Jim
> On 03/14/2011 08:13 PM, Joe Leikhim wrote:
>> Paul;
>> 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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