lords
Active Member
tilehead said:
erm, why you say that......PC's pump power and use fans...people that get to hot use fans
fans are a good thing
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Loudest Export radio out today?
- Thread starter 211 in tha mag
- Start date
erm, why you say that......PC's pump power and use fans...people that get to hot use fans
fans are a good thing
211 in tha mag said:
Well I use the FT-817ND headphone out hooked up to the AUX in on my stereo of my Jeep and when I crank the volume ITS LOUD.
This is an appropriate answer seeing how there was no definition of what EXACTLY is wanted.
PS its loud in any mode
10-4 I guess your are right but I can imagine the fans going kaput. I want my radio "maintenance" free as possible. :lollords said:tilehead said:
erm, why you say that......PC's pump power and use fans...people that get to hot use fans
fans are a good thing
NorthStar:
"This is definitely a dead horse."
Beetle:
"Again with the "loud". Undefined and purely subjective."
you're both correct. loudness is strictly and objectively defined as a function of the amount of increase in PEP (dB = 10 LOG (1 + M)2) or AVG (dB = 10 LOG (1 + (M2 / 2) ) power generated given a particular (percentage of modulation) modulation depth.
"This is definitely a dead horse."
Beetle:
"Again with the "loud". Undefined and purely subjective."
you're both correct. loudness is strictly and objectively defined as a function of the amount of increase in PEP (dB = 10 LOG (1 + M)2) or AVG (dB = 10 LOG (1 + (M2 / 2) ) power generated given a particular (percentage of modulation) modulation depth.
4600turbo said:
When i say loud I mean 100 watts to 400 watts swing in your face power that will be there for 10 to 15 miles. A radio that can not be mistaken for a 4 to 16 watt 100% that may be loud but only loud in the truckstop.
A radio that has 100 to 150% modulation swing and when you talk into it your voice sits at or near the 100% modulation. Where It is the loudest. You could do this with a voice processor, but when you have 400 watts of swing. It goes for a long distance.
"....dont matter if it has a built in linear or not."
it's clear that the distance variable is not part of the equation and neither was it of any concern to the original poster since a radio with an amplifier will produce a STRONGER SIGNAL (UV/M) than one without. the fact that receiver sensitivity, antenna height, gain and propagation mode are able to influence the amount of energy at any given point in space from the transmitter measured in microvolts per meter has nothing whatsoever to do with the modulation index or "loudness".
in an am transmitter producing 4W of carrier and 16WPEP the increase created by the modulated envelope is 6db. and the same goes for a transmitter producing 100W of carrier and 400WPEP, 6db.. take any amount of carrier power and modulate it to four times that carrier power and you have a 100% modulated signal.
dB = 10 LOG (1 + M)2
db = 10 LOG (1 + 1)2
db = 10 LOG (2)2
db = 10 LOG (4)
db = 10 (.60)
db = 6.0
M = modulation index, 1 = 100%
the "loudness" of an am transmitter is solely based on the amount of increase in power output between carrier only and fully modulated (100%) carrier conditions, period.
if the original poster intended the distance variable to be a factor here he would not have added the statement "....dont matter if it has a built in linear or not."
it's clear that the distance variable is not part of the equation and neither was it of any concern to the original poster since a radio with an amplifier will produce a STRONGER SIGNAL (UV/M) than one without. the fact that receiver sensitivity, antenna height, gain and propagation mode are able to influence the amount of energy at any given point in space from the transmitter measured in microvolts per meter has nothing whatsoever to do with the modulation index or "loudness".
in an am transmitter producing 4W of carrier and 16WPEP the increase created by the modulated envelope is 6db. and the same goes for a transmitter producing 100W of carrier and 400WPEP, 6db.. take any amount of carrier power and modulate it to four times that carrier power and you have a 100% modulated signal.
dB = 10 LOG (1 + M)2
db = 10 LOG (1 + 1)2
db = 10 LOG (2)2
db = 10 LOG (4)
db = 10 (.60)
db = 6.0
M = modulation index, 1 = 100%
the "loudness" of an am transmitter is solely based on the amount of increase in power output between carrier only and fully modulated (100%) carrier conditions, period.
if the original poster intended the distance variable to be a factor here he would not have added the statement "....dont matter if it has a built in linear or not."
like "beauty is in the eye of the beholder", loudness is in the ear of the receiver.
Receiver AGC in some CB radios might not maintain the same gain over the full dynamic range, ie. -120dBm to -50dBm or so. Meaning the AGC could allow weaker signals to drop in gain a bit, and/or stronger signals increase. This could be tested with just a RF signal generator AM modulated with 1KHz (or so) tone. vary the RF amplitude from weakest -120dBm to whatever the strongest would practically be, and record the change in audio level.
The other thing is the frequency response of the receiver audio circuit and the speaker itself. If you know the audio frequency range that produces the loudest sound, you can make sure your transmitter is at 100% modulation there.
Receiver AGC in some CB radios might not maintain the same gain over the full dynamic range, ie. -120dBm to -50dBm or so. Meaning the AGC could allow weaker signals to drop in gain a bit, and/or stronger signals increase. This could be tested with just a RF signal generator AM modulated with 1KHz (or so) tone. vary the RF amplitude from weakest -120dBm to whatever the strongest would practically be, and record the change in audio level.
The other thing is the frequency response of the receiver audio circuit and the speaker itself. If you know the audio frequency range that produces the loudest sound, you can make sure your transmitter is at 100% modulation there.
"........Meaning the AGC could allow weaker signals to drop in gain a bit, and/or stronger signals increase."
you have it backwards. Automatic Gain Control increases the gain of the controlled stages in the case of weaker signals and attenuates the gain of those same stages in the presence of very strong signals.
you have it backwards. Automatic Gain Control increases the gain of the controlled stages in the case of weaker signals and attenuates the gain of those same stages in the presence of very strong signals.
freecell said:
I'm sure what you said is all true and correct, but in layman terms and what most truckdrivers call loud is exactly what I said. They want a radio that is loud like one with 100% modulation like you stated but they also want one that will reach out and touch someone.
Also echo boards are also consider in the equation; because most people consider the enhancement that the echo board does to be loud also.
You ask someone which is louder. key a radio with the echo on then key the same radio with the echo off. Then ask which is louder you'll find out that most people would say the one with the echo on is louder even though it's putting out the same modulation either way.
Im impressed with my Gen Lee. Loud and clear is the key. Love my 95T also but they do run warm with a 40 watt DK. I am now running it with about 25 watt dk pep about 140. I use it for a base and keep a cage fan on it and it works great. For the money the Gen Lee/Connex 3300s cant be beat.
freecell said:
Thats right. Ideally it would.
I am just saying that some radios AGC might not maintain a constant output over the full dynamic range of RF input level.
well i look at it like this
when i go to the shootouts and breaks and see and hear the guys winning and hear the guys in dx
the ones that stand out its just a different sound beyond the rest
i have to ask them what kind of radio you using
90 % of the dx that i hear are running cobra 25 cobra 29 ltd classics
cobra 148s and the uniden counterparts
at a break or shootout you will more than likely not see the bells and whistle radios winning anything
one time and its been only one time i seen a galaxy 55 but it was in 2pill class
most of the guys i know on the bowl run the cobras and unidens
i dont mean cobra 150 or 200 either
i would put money on a setup with this
cobra 29 going into 3pill into a 8pill on a suburban
beating a guy in shootout and dx
with a export radio going into a 2pill driving a 8pill in a suburban
when i go to the shootouts and breaks and see and hear the guys winning and hear the guys in dx
the ones that stand out its just a different sound beyond the rest
i have to ask them what kind of radio you using
90 % of the dx that i hear are running cobra 25 cobra 29 ltd classics
cobra 148s and the uniden counterparts
at a break or shootout you will more than likely not see the bells and whistle radios winning anything
one time and its been only one time i seen a galaxy 55 but it was in 2pill class
most of the guys i know on the bowl run the cobras and unidens
i dont mean cobra 150 or 200 either
i would put money on a setup with this
cobra 29 going into 3pill into a 8pill on a suburban
beating a guy in shootout and dx
with a export radio going into a 2pill driving a 8pill in a suburban
Like I said before , Good Ole Cb Radios !! but being realistic here ......I suppose, that really wasn't the question here.
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