Mike, I agree that double-shielded coax might help (in fact, I should do that in my shack!) I've found that stubs and filters don't always make a big difference in the S-meter reading at the harmonic
Well, if nobody else is going to ring in here I will... I know this is a new publication and mebbe I am one of the first to see it.... International Radio, the INRAD folks, has at its helm George, W2
Yeah, but what happens when the stubs get "testy"? :-) I made mine out of Fused Disc 75 ohm hardline cut for a compromise of SSB/CW and I can tell you that even though I measured and cut them VERY ca
Gee, I'm not alone in receiving less-than-stellar performance from stubs. I have made several sets of stubs using various methods of tuning them and they just don't work at my QTH. But I took one of
Bob, The impedance of the coax used to make the stub won't affect the results as long as the stub is cut to the correct length for the velocity factor -- i.e., the correct electrical length. Since th
Hi Dick, as That is my understanding. I used the MFJ269 and cut to the correct electrical length. Stub response is relatively narrow, so I don't think CW That was a consideration but after talking wi
Let's think about this for a minute. Let's assume you are transmitting on 20 meters into a 20 meter monobander. A small amount of harmonic RF is also being transmitted on 28 Mhz into the 20 meter mon
you are seeing what i would expect if there were: 1. a source of harmonics after the stubs, on the tower, near the tower, etc. 2. a leak between the radio and stub that radiates the harmonic before t
Great catch! It's so very often these little things that slip past us, and that we seem to learn and relearn and relearn, that cause such grief! I'm pretty sure that by the time such a problem crops