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Diecast aluminum boxes are relatively inexpensive, some can offer waterproofing with an inset gasket, and offer good E-field shielding (if proper attention is paid to ingress/egress of

Thanks for all the suggestions, but I recently purchased an LZ1AQ type amp from Everett instead.? Local waterproof PVC electrical boxes fit the circuit board just right.? I use 1/2 inch Heliax for

Suggestion for KISS method completely DIY.? I thought it was rather difficult to make such a small PCB preamp DIY without a special PCB, so I am just using a 80x80x50mm waterproof electrical box with

can you not find the dimensions online and make some using a 3d printer? Just a though Nick G8SYE

There is a thermodynamic problem embedded in the design a broadband antenna matching network, named "entropy". The issue is well covered

Can't find the links for the ANT articles within there. 73 Horacio CX3BZ [email protected]> escribió:

He was very friendly and I got a mention on his website for fd4 antennas. Rest in peace. -- Thanks Steve M0ZEH

For a broadband transformer the “rule of thumb” is that the reactance of the low impedance winding should be 4x the impedance ?at the lowest frequency of operation. So for a 50 to 450 ohm

I suggest you try The free program TLW which can match using several different methods like L, T, and Pi. /g/nanovna-users/topic/transmission_line_tools/76720904

Why not use SIMNEC 2.5, this versatile tool from AE6TY does the job, including the transmission line and much more. Lots of support and tutorials available. SimNEC Interactive RF-Circuit Analysis (

Merry Christmas to ALL from Los Angeles, California !!!! 1). Need a Formula for designing an "L Impedance Matching Circuit" for matching 50 Ohms to an Antenna with a known Antenna Input Impedance ?

Fortunately family and ham friends have safeguarded his website. It will remain online at: https://www.pa0fri.nl/ 73, Cor - PA4Q

Hi Tom, The noise figure you quote seems to be quite high, is it a mistyped value ? I'd have thought it would have been around 6dB, or maybe even better. Regards, Martin

Hi Tom, A useful option for this kind of multicoupler is a preemphasis filter: http://ka7oei.blogspot.com/2020/08/revisiting-limited-attenuation-high.html 73, Mike AF7KR

I sold a bunch of multicouplers this month and still have one left. The multicoupler can power an active antenna with its internal bias-tee, and feed 1 to 4 receivers. If interested contact me at

Oh that is very sad news. Such a prolific experimenter too. I’m very sorry to hear that. Vy 73 Adam Adam Moss G0ORY [email protected]> wrote:

J,> [email protected]> wrote:

That would be GREAT Mark...!? Best...!? Greg S.

You can use the 'wget' command (native on linux but available for windows) to backup an entire site: $ wget -m https://www.pa0fri.com/ This results in a 160mb-ish archive. Alternatively I can make

On some occasions, websites don't get fully snap shotted, and some weblinks will fail. Try an image from a different date, as that often solves the problem. Regards, Martin