![]() ![]() I’m in the process of designing a method to enable an “any-to-any” scenario, however this requires some quite complicated logic and switching, but I’m quietly confident version 4 will be born fairly soon. Some eagle-eyed may spot that currently components C3 and C4 are unpopulated, these two capacitors are simply to eliminate “key bounce” on the front panel control buttons, their value to be determined by a bit of trial and error, and can also be soldered directly across the switch instead of on the PCB. The main picture at the top of this page shows version 3 of the mic switch project with the components soldered into place. Compared to PL-259 connections, they have two significant advantages. Once the design is completed it was then sent to JLCPCB to produce my prototype PCB’s which arrived within a week of ordering.Īfter building the first electronic prototype unit, I made a few component and circuit changes and completely redesigned the PCB, making it both smaller and neater. Ring Style Connections Ring-style coax ends are another popular way to connect the CB coax to the mount. Altium Designer allows you easily place the components on the PCB and then route the tracks on both the top and bottom of the board. I used the Altium PCB design software to create my PCB design. This electronic power switch has been designed so that it can also be used to control power to external devices, currently planned for controlling the power supply to my remote auto ATU. In order to make a vertical antenna from a coaxial cable, you will need the following materials: 1 50 ohm (or 75 ohm) coaxial wire with copper shielding FM receiver with a coaxial connector 3/8-inch copper tubing Wire cutters Hacksaw Soldering equipment 2 Calculate the length of your antenna. ![]() This simply turns the unit on whenever a radio is powered up, and turns the unit off when the radios are all off. ![]() With the basic mic switch circuit designed, I then added an auto-power function using the voltage output available on all my radios. The are three outputs, one each for Yaesu, Kenwood and Icom. The current design has two inputs, input 1 being wired for use with Yaesu mics, and input 2 wired for Kenwood wired mics. This is technically incorrect as the “plug” is actually the socket, likewise the “socket” is a plug when defined by the pins and receptacles – take a look and think about it.ĭeciding this wouldn’t be the best option, coupled with the difficulty in obtaining a suitable mic switch, I embarked upon designing the electronic switching and logic circuits, version 2 of the project. Yes, I do mean plugs, allow me to explain most people refer to the connector on the radio as a mic socket and the connector on the mic cable as a plug. The easiest method of constructing a mic switch would have been to simply put a couple of plugs on a box with a multipole, 3 way switch, my idea for version 1. Then I also want to use them with my Icom 756 ProIII which feeds a voltage on the audio signal pin which requires blocking. The first hurdle is the fact that although both mics share an 8 pin connector, the wiring is slightly different. I concluded that my favourite mics were my Yaesu MD-200 and my Kenwood MC-60. My requirements were that I could use either the same standard fist mic, desk mic or studio mic with whichever radio I wanted to use at the time. Ready built mic switch units are available, but none that I looked at really suited my needs, thus the idea to design and construct a custom solution formed. I will measure when i get up there what the distance is between the 2 antennas and space them out more if needed.Why build a mic switch unit? One of the problems with having multiple radios and one or two favourite microphones is the ability to use those mics with any of the radios. I have an Astro-plane that will be going where the PDL-2 is mounted now. I have my PDL-2 that is getting moved to the chimney and mounted on a rotor. i don't plan on running power at this time through this switch except for whats coming out of the back of the radio.Įverything is working fine now on the inside of my shack so now its time to work out side. Tried both switches and neither showed any difference in swr. And low and behold my swr went down to where they are suppose to be.Ĥ. Drilled the holes where i wanted them and wired everything up. Went out and bought an electrical outlet box. by: Al Williams DecemTalking about this Chinese ham radio transceiver requires a veritable flurry of acronyms: HF, SSB, QRP, and SDR to start with. Switched out the switch for one stated before. Put the 4 1/2 inch connectors through the 4 holes in the sides of the box. I decided it was time for me to look back at what every one has wrote and seen where i went wrong.ġ. This method is for those who want to know How to make a CB antenna for a car. ![]()
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