It depends on where that bypass capacitor goes to. In his tutorial workshops, EMC guru Henry Ott teaches us to carefully learn and study "the hidden schematic lurking behind the ground symbol." 73, J
Sounds like nothing more than the mic gain turned up way too high. I don't know the 540, but the manual should tell you where the mic gain is. 73, Jim K9YC
I'd guess that you're not using enough bias. Elecraft and others use 5.6K between V+ and the mic. You may also be wearing the mic too close to your mouth. It will sound better if you don't "close-tal
Hi Steve, The amount by which you needed to increase the gain in the Orion is approximately the attenuation of the pad. I strongly recommend against using such a pad external to the radio on a microp
Misconception Alert! We are not talking about a connection to Mother Earth. That is NOT part of a solution to RFI. What we are talking about is avoiding a path for RF current flowing on the shield th
Steve, No matter what the manual says, much of what Ten Tec and other ham mfrs do is WRONG, including much of what you are describing. CAPS added for emphasis. The ONLY proper connection for a cable
FD antennas depend a lot on where you live. From Chicago, I used a pair of 20/15/10 fan dipoles -- one broadside E/W, the other N/S. They don't need to be very high -- 25-30 ft is good, and a bit low
Off-center fed antennas put lots of common mode RF on the feedline, which is bad news for interaction between stations. Yes, stubs and bandpass filters can help reduce interference between stations.
Yes. Study my summary of ARRL Lab Tests of the TX cleanliness of a dozen or so medium to high priced modern rigs. k9yc.com/TXNoise.pdf Look for rigs with very low TX phase noise in the wide plots. I
A connection to earth has NOTHING to do with EMC, RFI, or interstation interference. Yes, common mode is damned important, and so is separation. 73, Jim K9YC
BS. Everything is 50 ohms ONLY at the fundamental frequency for the antenna. At ANY other frequency, everything, both transmitter and antenna, is VERY different from 50 ohms resistive. For the CA QSO
Several years ago, I modeled a 40M OFCD dipole with offsets varying from a foot increments of a few feet to a lot more, and dissipation in a practical choke inline with these antennas. The results ar
On Thu,4/16/2015 8:48 AM, Don Jones wrote: Sorry for taking to the field or sharing here what works for me in my EMC/Lightning Lab on a daily basis. We make tens of thousands of dollars every year of
Hi Don, I did read the NCJ article. Some of it is great, but some of it is wrong. Specifically this -- the standing wave pattern on the line is determined by the LOAD Z, which varies WIDELY with freq
You may not appreciate it, but the Omni6+ is getting a bit long in the tooth, and the state of the art has moved on. My Omni A Series D was a pretty good radio for its day when I bought it new in 198
I haven't made that comparison (no access to Omni VI). The KX3 is a VERY nice radio, but it's fundamentally a backpacking radio that CAN be a great mobile rig or a great home rig IF you add some thin
Your question is timely, Rick. As it happens, my friend Scott, AF6RT, is preparing for a backpacking effort to activate CM79 on 6M for those pursuing the Fred Fish award (working all grids within the
Very nice idea, Rick. Like any other HF vertical, this antenna would work even better on a rooftop. http://k9yc.com/VerticalHeight.pdf 73, Jim K9YC On Sun,3/1/2015 11:54 PM, Rick - DJ0IP / NJ0IP wrot