Could someone give me a quick how to on hooking up an EQ to a CB for receive purposes. One from an old stereo. Also, what is involved in wiring one into the transmit? Thanks for the help in advance.
So you are saying it would not help me to fine tune the sound for my hearing? How about cut out some of the high tone.. like a high cut filter?It's useless for that purpose because of most key frequencies are out of CB audio bandwidth.
How about connecting one to the transmit. Does that work also?An eq on the output jack of your radio works great... Cutting off the highend hiss sounds fantastic... I use a 4 band parametric eq. It does help if you have a good sounding speakers as well
How about connecting one to the transmit. Does that work also?
Yes, it can be done. I rigged up a phonograph preamp as a mic amp to make a dynamic mic a power mic. I will see if I can get a picture of it. It would be the same type of hook up for an eq.How about connecting one to the transmit. Does that work also?
Thank you for the explanation. It sounds a little more complicated that I thought It might be. RFIn light of what you're asking.
There are different Mic ELEMENTS that can make your efforts harder to complete.
The typical Cobra 29 / 25 Uniden Grant XL or PC-122 or the Cobra 148 - use DYNAMIC elements, its a simple speaker on a cord - you talk, the diaphragm vibrates, the magnetic coil picks up this vibration and changes it to a signal - the radio takes care of the rest - it's extremely amplified - but that is due to the very very small signal you are putting into the radio.
Another type is Electret, uses a small trickle power of current and voltage - but it has an amplifier in the cartridge to make it stronger. They use a diaphragm called a membrane - that one side is exposed to the outside while the membrane then rests in a cavity where another plate is used that sees the vibration as a change of capacitance. A voltage is present on the membrane and the plate - and so it exerts a field and changes when vibrated. An FET amplifier built in to the Electret, sees this change and amplifies this as a signal.
The FET - changes it to an audio signal (AC-Audio) to about 1 volt less in voltage than the DC power it uses. The trick in making this a workable signal is thru the IMPEDANCE - the amount of effort the signal has to overcome in ohmic effort from 0 to XX volts - and the amount of current behind it to force that power - in amps, only in uA onto mA of draw into a known load of ohmic measurement. The Line Level reference is to demonstrate a "strength" of signal - into known ohmic loads.
- Dynamics use coils - so it's inductive, Electrets use Capacitance.
To begin a journey of learning more...try here...
- It's not that you can't - it is that you will encounter problems if you don't know how to properly transfer the audio from one source (your Mic) thru your EQ, then into your Radio - without knowing how to properly drive and terminate the signal so your system seems a balanced = equal impedance - condition.
https://en.wikipedia.org/wiki/Line_level
The effort to change the DC power thru the element - into AC - is this Impedance and Drive Level Power. (Strength of signal)
Dynamic elements have very little capacity to push power.
Electrets can use a known voltage across a known resistance - to generate this signal as a difference. So in theory and practice, they can take a higher voltage and low-power current to obtain a higher outputs drive level. They convert the signal by blocking the DC component of the power, and allow the changing power levels of both voltage and current - by using a blocking cap to transfer the signal from one sourcing to another - this is where the Impedance and the effort (Strength) comes into play.
So when it comes to EQ's, your Mic - if it's Dynamic, may not push the drive level very well, maybe as a public address system - using an EQ that can work with Dynamic or Magnetic Cartridges will work fine, they will amplify the power level to obtain what they call Line Level inputs, an industry standard.
So as you are thinking about the EQ, remember your EQ - needs to have a "standard" input and output - to interface with your project.
So if you use an old Radio Shack Equalizer - it's used in a Tape Monitor Loop for Home stereos - a little different Line-Level signal is needed.
I have a old Realistic parametric eq. Could you give me a little more information on how to make it work on the cb receive? I am kinda green at this. ThanksAn eq on the output jack of your radio works great... Cutting off the highend hiss sounds fantastic... I use a 4 band parametric eq. It does help if you have a good sounding speakers as well
Is this in any way comparable to the mods that Drail is doing ?
Is this in any way comparable to the mods that Drail is doing ?