Frank, Placing ferrites on the line adds reactance and so changes the impedance of the line at the ferrite. If they didn't add reactance, they wouldn't function as filters. The better they work at re
I also think this topic is worth addressing, but Bill is probably right in saying it could gobble all the bandwidth on this reflector. Maybe someone would be willing to be the moderator of a new refl
Paul, A matter of interest: A number of years ago, I ran a test program in our EMC lab on LED traffic lights. We tested a number of different brands because they'd been failing prematurely. Texas has
Dave, Which bands are you listening on? It's possible you'll find that the antennas perform better on 40m or 30m than on 160m or 80m because of your latitude, which is near zero. I understand there
Eddy, If you haven't already, you might want to take a look at Rudy Severns' site (http://www.antennasbyn6lf.com/). A bit of reading will answer some or most of your questions. It's been a few years
Dave, I agree completely. These guys are top notch operators. As always, with a complicated operation carried out under less than ideal conditions, there are snags. No matter. This is still one of th
"The FCC is going forward with its plan to allow the r.f. noise floor to rise to unprecedented levels which will, of course adversely affect our hobby." Mike, The article is mainly concerned about th
Mike, et al., I wasn't aware of the FCC inquiry, but I'll do some checking on line. I'll also talk with the compliance rules guru at the EMC lab where I was an engineer for some years. But we should
"If a BNC is wrapped with Scotch 2242, over-wrapped with Scotch 88+, and not submerged, shouldn't that be adequate?" If you do all this, wouldn't that make BNCs a pita too? Brad KV5V ________________
Jerry Sevick, W2FMI, has an interesting comment about the "120" number in his book, "The Short Vertical Antenna and Ground Radial." At the end of the first chapter he notes: "...it should be mentione
I think Jeff's approach is sensible. It isn't offensive, and it gently makes an important point. But alas, I'll confess that I'm one of the offenders. For a couple reasons, I did respond respond to d
Topbanders, Here are some comments on RM-11708 which I think are relevant to topband operation. We've been asked to send responses to the ARRL, so remember that responses to the reflector may stimula
Eddie, Would like to meet you at that time, but we'll need to pick a frequency. 73, Brad KV5V _________________ Topband Reflector Archives - http://www.contesting.com/_topband
Can't hear it at all in central Texas. It was running S7-S9 last night a 2100. Brad KV5V _________________ Topband Reflector Archives - http://www.contesting.com/_topband
Don, FWIW, today, W5UJE and I dealt with a treadmill problem similar to yours by installing a commercial line filter between the line and the treadmill electronics. A Corcom/TE Connectivity 20VR1 fil
Don, You make a good point about the difference between our definition of CM noise and the definition implied in Part 15. If the external torroid made a difference for you, then it's important and wo
Yes. Remember, the test is conducted with the EUT taped to a grounded copper plate on the table top. The LISN is taped to a grounded plate on the floor of the test chamber. This is not how we set up
Jim, No question that a separate filter for the green wire can make a difference when there's RF current on that lead. But I'd wait to add the extra filter until I was sure it was needed. The case ye
I agree with Tom--that calling out of turn is one of the least damaging mistakes we can make in a pileup. 25 Hz filters can often take care of the problem. But here's the rub...the guys who zero-beat
I don't know if the policy is still in place, but I remember that Polyphaser used to offer free testing of their products if you sent them back to the factory. Words about it were buried somewhere in