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mobile power mics

  • Thread starter Thread starter oldslowchevy
  • Start date Start date
Well,so if you run it below the squeal point it works ok? My Royce has a audio compressor inside so yours don't need that much audio I guess. Some guys on this forum said they couldn't run power mic's on their Royce's without squealing.
Have you tried talking on it below where it squeals?

I've gone as far as I know on this.
Again,a good tech can tune the radio for good modulation. You could send DTB an email and see what he'd suggest doing. I take all of my radios to him.
dtbradio@pa.net
 
Lil'Yeshua said:
Last thought; you sure you don't have any wires touching when you wired the mic?
Click to expand...

Will check again.

Might send to DTB but have to decide if I want to pour money into an old radio or just get a new one.

Thanks for your help!
 
Lil'Yeshua said:
Last thought; you sure you don't have any wires touching when you wired the mic?
Click to expand...

Will check again.

Might send to DTB but first have to decide if I want to put money into an old radio or just get a new one. (With the features I want). Also am hesitant to make any changes in case I decide to sell it. Some would want it un-fiddled with.

Thanks for your help!
 
Riverman71 said:
Will check again.

Might send to DTB but have to decide if I want to pour money into an old radio or just get a new one.

Thanks for your help!
Click to expand...

DTB can get you 100% modulation without a power mic. My radios do not need power mic's but I prefer to run them especially when I'm trying to be heard.
Is your antenna near your radio room? I was just wondering if RF is getting into your radio through the mic cord but that's a whole new can of worms that others could help you with if that were the case. I did find on CB Tricks where you could cut diode 202 but you would have loud over modulated audio.
 
hotrod said:
if ya got a mike gain knob on radio cut it back. peaking your audio inside your radio
is only gonna make it WORSE not better.
Click to expand...

I cut the radio mic gain way back with no change. I seem to remember that my very first CB, a Radio Shack Navaho wouldn't accept a power mic unless a capacitor or something was added to the circuit. Maybe Royce's are the same way. Lil' Yeshua, were you able to use an amplified mic on your Royce? Can't remember.
 
I never got that far with my Royce. I sent it to DTB and let him do a basic tune and align on it. After I got it back I gave it to my brother as he collects vintage NIB/NOS stuff. I did encounter the problem of running a power mic on my GE radios and a GE radio my brother sold another guy whom traded it to another guy who cut the diode in it. He could run a power mic on it then as long as he kept the modulation down close to 100%.

If you let DTB Radio tune it and maybe match up your power mic with it then you'll be sitting pretty and eating cake.
I don't have enough knowledge yet to even want to tinker with the innards on a radio.

Your 619 probably has a compressor in the audio chain that boosts your voice. That along with properly setting the modulation will make it a good operating radio.

I can tinker with my Galaxy 959's modulation rather easy but those radios like you have has me stumped when trying to run a power mic with them.

Without the proper test equipment you're just shooting blanks.
 
This seems like the forum to ask this question:

Is a radio tuned to 100% modulation with a power mic louder than one tuned to 100% with a stock mic?
 
Riverman71 said:
This seems like the forum to ask this question:

Is a radio tuned to 100% modulation with a power mic louder than one tuned to 100% with a stock mic?
Click to expand...
Maybe maybe not.. Let me explain, it all depends on how the mic is set, a power mic can easily overdrive a radio if set incorrectly. Many newcomers to radio like to turn the dials and knobs all the way to the right resulting in distortion and splatter. A properly tuned radio will sound perfectly readable and loud with a stock mic. The use of a power mic generally is more for tonal response than power, most power mic's have a better element in them which if again set properly will "sound" better. If you use a power mic set it low and use the mic gain on the radio to control the output.

So you are probably asking; do I use a power mic? Short answer is yes and no. I do use one on my home shack rig but it is set at a level of three and the mic gain on the rig controls the output. I use it more for the tone control it has for tailoring the frequency response to my voice and band conditions. I will run a lower freq response for just rag chewing and a higher response for breaking pileups. The No part is in the car, the rig I run there works just fine with the stock mic it came with...its designed by Bob Heil but still a stock mic.

So this was more then you wanted huh...
 
No; 100% modulation is 100% modulation - a level seen on the scope.
Both mics may read 100% but they will sound different. Power and noise-cancelling mics tend to go over 100% because most users have no way of checking it with a scope . . .
 
Robb said:
No; 100% modulation is 100% modulation - a level seen on the scope.
Both mics may read 100% but they will sound different. Power and noise-cancelling mics tend to go over 100% because most users have no way of checking it with a scope . . .
Click to expand...

Don't forget that 100% modulation is still 100% modulation even if it's flat topped!

No modulation meter can show you that.
 
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