EMRFD Message Archive 1042
Message Date From Subject 1042 2007-09-19 07:08:08 Greg Derda Regen 101 question Hi all,
Although I've built several kits I am fairly new to homebrewing. I'm
reading W1FB's books, EMRFD, SSD, and several web sites. I've built
the basic regen receiver from chapter one of EMRFD and it works GREAT,
but with a few quirks. I'm getting lots of very strong, clear signals,
but I haven't quite figured out how the bandset and bandspread
interact, and how/why using an external (manual) antenna tuner seems to
affect those interactions.
One discovery that I think I have made is that the double sided PCB
board I am working with acts as a capacitor itself, and depending on
placement of parts, and connections to the board (e.g., alligator clips
that contact both sides of the board) , things change.
I have two pictures of my current test bed at the following link. I
built the test bed with the three air-variables thinking I could use it
for several little regen projects (I've also built two basic Kitchin
receivers). The regen receiver is on the board elevated just above the
test bed, and the audio amp is on the board to the right.
To keep things simple, and to help me eliminate spurious stuff that
might complicate my "investigations," my single question is.......
What is the best way to mount regen circuits (e.g., wood?), and/or what
obvious things do you want to avoid (e.g., double-sided PCB boards)?
Also, if you notice any other "no-no's" on my boards (e.g., are there
any rules for toroid placement?), I'd love to hear them.
Thanks to all,
1047 2007-09-20 06:53:08 Artur Angielski Re: Regen 101 question 1075 2007-09-30 12:15:45 kb9bvn@embarqmail... Double Clads I have used double sided copper boards for building and experimenting and haven't run into the capacitance problems described earlier. I wonder though, what if you just added a few connections from the top to the bottom of the copper clad to join them into one physical surface?
I really enjoy lurking and reading this group!
73 de KB9BVN