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Whith a simple hole, sometimes small insects get in and the IP-class of sealed cases is lost. Thus instead of a simple hole, i prefer protective air and moisture vents. There are two versions, cheaper

No mater how good the box is, if you don’t drill vent holes in it you will get water in eventually. Everett N4CY Sent from the all new AOL app for iOS

Clever idea on the GoreTex tape and good find on the Honeywell vent. FWIW, I just deployed my LZ1AQ in a sealed ABS box with one of these for a breather: https://www.amazon.com/gp/product/B0C328HWV7

Some thoughts on cases for exterior loop antenna amplifiers. This equally applies to any electronics in exterior service. The top of the line cases are polycarbonate, Hammond probably manufactures the

Good read! I think your Miss Marsh could be related to my grammar school physics teacher :-) Michael 2E0IHW

Guy, I have an LZ1AQ that almost got installed before I had other things happen in life. I am also laying out a Wellbrook board from the traced-out schematics. My main antenna has been an active whip

I took introduction to chemistry and physics in the 9th grade (along with Latin and typing) The teacher was a cast iron !@$% about properly documenting every step of every experiment we did.

Steve, ?? thanks. Well, I am interested also in VLF, so maybe I should try to get hold of some 2SK932, though the idea of working with SMDs is not appealing (but I have already done that in the

Hi WN4ISX and Simon, Thanks for the notes. Both of you. First WN4ISX (Terry?) Thanks for the reminder to keep notes. Being an old submariner and Sonar tech, ELF,VLF,HF and NDB's and CW interest me.

PS.. I am new to using receivers, and SWL CW listening. Newbie here. Not new to Ham Radio QRP and CW though.. -- 73/ Guy, N1GMM Web Presence: Withywindle ( https://niggles-parish.blogspot.com/ )

Hi Mike, Thanks for the info on Chris's paper (Chris, thanks for all the work!). Very interesting and am thinking of implementing a shielded loop radial using this. What loops are you using? My plans

It is an incredibly long tale told across multiple mailing lists, mostly forgotten. Anyone remember Onelist? Loads more transferred and absorbed. I'm awaiting more radiation, sadly their machine broke

Also wanted to mention that I'd probably go with PEC-AL-PEC 1" if I had to purchase loop material again. Like this one: https://www.ebay.com/itm/144928782978 You get slightly more than 1" (OD) of

I had a complete replacement of both knees simultaneously a few years ago. I didn't want to go through PT twice and wanted it over with (the pain on simply walking had become intolerable). Sure, it

Not sure if this info will be helpful to anyone but I double boxed my LZ1AQ. Internal box is what it came in from Chavdar. An external one is much bigger IP67 box that also holds two 1m loops:

Carl, You can try QRZ, N4CY, or Everettsharp (at) aol com. Everett N4CY

I second that. There is a SprintLayout group on Groups.io. Lots of useful files in the files section. The program costs about the same as dinner for 4-5 at McDonalds and is not a subscription or an

Sometime back I mentioned to the list about experiments I've done using various numbers of jfets as well as trying different types. Using the 2SK715s (or the SMD equivalents), the input impedance

Everett, How do I contact you off-list about some board designs? Thanks, Carl AK4OT

What happens if, instead of the 4+4 2SK715 FETs used in the schematic of the ALA1530, I will use only 2 + 2 ? I have only 5 of those FETs, so cannot build the schematic in its original form... Are