That shorted stub cut for 20m has to be installed on the 20m station (station B) to suppress 40 and 15 there. On the 40m station (station A)you will need an open stub cut for 20m to suppress 20 and 1
Sorry it has to be the other way round, open stub at the 20m station, shorted stub at the 40m station, I mixed it up while writing. 73 Peter That shorted stub cut for 20m has to be installed on the 2
HI Peter, Thanks for your email. Are you SURE ? I am looking right at the K2TR page and also an excerpt I printed from (I think) K9YC or K1TTT and it shows on the 40m station, a 23' stub (1/4wl, shor
OK, hi, just saw your email now. They crossed coming across the Atlantic ;-) Mike, Coreen & Corey Keswick Ridge, NB Sorry it has to be the other way round, open stub at the 20m station, shorted stub
Note; the stub length includes the Tee and and any switch if used, as well as the velocity factor of the cable used for the stub. 73 & DX, Gary - AB9M --Original Message-- From: Peter Voelpel Sent: T
So if that is true Peter, what do I put on the 40m station to prevent 7MHz harmonics from appearing on 20m? Maybe I am thinking about this all the wrong way. I love to learn new things but I cannot b
OMG Bill-really? Well...I am not using the 10m stub. Let's forget that one for just a moment. I have a 1/4WL 7MHz shorted stub (roughly 23' or so and tweaked/measured vy carefully on my AA-230pro) on
Hi Bill & many others, Kimo, Dave, Jim, Peter, Gary, Gerry....I've forgotten a few. You are all very helpful and I am trying to wrap my head around this. I think I have to start from scratch and remo
Mike, quick comment on harmonic "tone". I have heard many hundreds of times my CW harmonics on my receivers. The tone is often buzzy, raspy, and/or otherwise distorted. Sometimes it's pure. If I were
Mike's most powerful line is: "I think I have to start from scratch and remove everything from in line from the transmitter." There is one indicator telling if the cause is harmonics by RF emission o
Hi Mike, That "growly" signals you're hearing are harmonics of your transmitted signal generated by unintentional radiators, especially switching power supplies. This type of RFI -- sometimes called
So, vy late last night, just before bed, I had Radio A straight to the HF9V (multiband) vertical and Radio B straight to the ZS6BKW multiband horizontal dipole. I spliced in the T and the stub on rad
That stub is to stop interference from 20m, not to block 40m interference on rig B! Against 40m qrm you will need that halfwave open stub (tuned for the 40m qrg) on rig B. 73 Peter So, vy late last n
It's a multi-band vertical... ugh... how long has it been since you took it apart and cleaned all the connections?? I had a tribander here that caused all sorts of harmonics, even when it wasn't conn
Hi Dave, It's an HF9V, so not really a "trap" vertical per se. It's perhaps 2 yrs old and still in nice shiny condx. I put it together with copper paste as well and there's still lots on it. I've als
That stub is to stop interference from 20m, not to block 40m interference on rig B! Against 40m qrm you will need that halfwave open stub (tuned for the 40m qrg) on rig B. 73 Peter 20m, and a 1 wavel
Author: K7LXC--- via TowerTalk <towertalk@contesting.com>
Date: Thu, 10 Sep 2015 10:34:27 -0400
Howdy, TowerTalkians -- Could we get back to tower talk? This cross-posting of a marginally germane topic (well, it does mention coax!) is getting a bit much. Tnx. Cheers, Steve K7LXC TT ADMIN ______
part of the problem is that different people use different types of stubs for different purposes. for instance you can use an open 1/2 wave stub as a band pass filter the same as a shorted 1/4 wave s