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5 votes

Rfi in truck with HF transceiver when running

There are many things you can still do. Here are a few quick suggestions to start with: Proper antenna ground. A mag mount is marginally OK at VHF / UHF, but there isn't enough capacitance at HF. The ...
tomnexus's user avatar
  • 11.2k
3 votes

Monopole antenna with no ground connection

Usually the shield is connected to the magnet at the base of the antenna and is capacitively coupled to the metal to which the antenna is attached. Typically a steel pizza plate acting as a ground ...
Jean-Marie's user avatar
3 votes

Rfi in truck with HF transceiver when running

Just a few random ideas which might help. With the truck running, tune the 707 all the way down to 160 meters and measure the noise. Then turn on a portable AM radio, or the AM radio in the dash, tune ...
niels nielsen's user avatar
2 votes
Accepted

Monopole antenna with no ground connection

What happens to the ground wire in this case (the outer part of the Coax output)? is the shield of the coax cable acting as the "ground"? Yes, and so is all other connected metal, possibly ...
Kevin Reid AG6YO's user avatar
  • 24.6k
2 votes

Converting an FM Antenna to a 2m/70cm Transmitting Antenna

Any whip antenna installation on a vehicle must have a structure that is physically and electrically something like the following. The precise construction of the junction/mount is not important (as ...
Kevin Reid AG6YO's user avatar
  • 24.6k
1 vote

What are the considerations re installing an ID-4100 in a DIN slot in the dash?

I did exactly this in my toyota van, which had a 2-slot (dead) in-dash radio that I pulled out. I fabbed a metal mesh grille to cover the upper slot for ventilation and mounted the 2-meter radio in ...
niels nielsen's user avatar
1 vote
Accepted

What are the considerations re installing an ID-4100 in a DIN slot in the dash?

I haven't done something like this, but in my youth fiddled with plain audio amplifiers that you could put into such a slot. So, watch for fluctuations and overvoltage from your alternator, in older 4-...
Marcus Müller's user avatar
1 vote

How to test real-world performance of a wifi and LTE IoT device

you can simulate control of the transmitter by attenuating the signal at the receiver. first, make sure that the body of the receiver is in a metal enclosure. You could even use some scrap copper ...
webmarc's user avatar
  • 4,105
1 vote

Monopole antenna with no ground connection

Dan, All simple antennas have two parts, think of the two arms of a dipole, or a rabbit ear tv antenna. The whip or monopole antenna has two parts also, the wire in the air, and the earth below it. ...
Jimbo47's user avatar
  • 86

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