Home |
Search |
Today's Posts |
#21
|
|||
|
|||
Field day station isolation
On May 13, 11:43 am, Michael Coslo wrote:
Highland Ham wrote: Mike Coslo wrote: I would suggest that No Spam might try an experiment, making a stub as a first try. It's simple enough that if it doesn't work, there isn't much effort wasted. ===== Mike , Was that a single or treble stub (Pi shape) ? It was a single stub. The situation was during a contest, so I had to come up with something quick. I can only imagine something like a Pi stub would have been all that much better. - 73 de Mike N3LI - But as I understand it, Mike, it was to kill something at least 4MHz away from 14MHz. That doesn't take a very high Q. The OP was asking about killing something 100kHz away, at 14MHz, and that's entirely different. I assume yours was a 1/4 wave stub on the freq you wanted to kill, open on the free end (or else a 1/2 wave stub, shorted on the free end). If it was RG-213-size coax, I'd expect the Q at 14MHz to be about 100. I can do that at 14MHz in a coil about 1/3 inch in diameter and 1/3 inch long. Cheers, Tom |
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
Working home station and club station field day 2005 | Policy | |||
WTB Isolation Transformer | Swap | |||
Broadcast Station Field Strengths.. | Antenna | |||
isolation transformer | Equipment | |||
isolation transformer | Equipment |